DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODEL

International Journal of Artificial Intelligence and Applications (IJAIA), Vol.15, No.3, May 2024
DOI:10.5121/ijaia.2024.15301 1
DEEP LEARNING FOR SMART GRID INTRUSION
DETECTION: A HYBRID CNN-LSTM-BASED MODEL
Abdulhakim Alsaiari and Mohammad Ilyas
Department of Electrical Engineering and Computer Science, Florida Atlantic
University, Boca Raton, FL, USA
ABSTRACT
As digital technology becomes more deeply embedded in power systems, protecting the communication
networks of Smart Grids (SG) has emerged as a critical concern. Distributed Network Protocol 3 (DNP3)
represents a multi-tiered application layer protocol extensively utilized in Supervisory Control and Data
Acquisition (SCADA)-based smart grids to facilitate real-time data gathering and control functionalities.
Robust Intrusion Detection Systems (IDS) are necessary for early threat detection and mitigation because
of the interconnection of these networks, which makes them vulnerable to a variety of cyberattacks. To
solve this issue, this paper develops a hybrid Deep Learning (DL) model specifically designed for intrusion
detection in smart grids. The proposed approach is a combination of the Convolutional Neural Network
(CNN) and the Long-Short-Term Memory algorithms (LSTM). We employed a recent intrusion detection
dataset (DNP3), which focuses on unauthorized commands and Denial of Service (DoS) cyberattacks, to
train and test our model. The results of our experiments show that our CNN-LSTM method is much better
at finding smart grid intrusions than other deep learning algorithms used for classification. In addition,
our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection
accuracy rate of 99.50%.
KEYWORDS
Security, Smart Grid, SCADA, DNP3, Intrusion Detection & Deep Learning.
1. INTRODUCTION
Traditionally, the term "grid" indicates the infrastructure that supports four essential electricity
functions within the realm of electricity: power generation, long-distance transmission,
distribution, and consumption [1]. The traditional power grid system (TG) is outdated, and it’s
no longer capable of meeting the growing demand for electricity. It’s limited when using
distributed and renewable energy sources, and it’s also inefficient when dealing with faults and
issues. Hence, there is a shared motivation across academia and industry to upgrade to a smart
power grid that aligns with contemporary living standards [2]. The smart grid is considered one
of the most prominent applications of the Internet of Things (IoT). It consists of two
infrastructures, known as the power infrastructure for electricity flow and the communication
infrastructure for information flow [3]. These grids are capable of transmitting power from
generating stations to consumers and information from consumers to generating stations.
Moreover, the term "Smart Grid" (SG) refers to the next generation of power grids that integrate
Information and Communication Technologies (ICT) [4]. The implementation of these
technologies enhances the efficiency and reliability of monitoring and regulating the generation,
distribution, and consumption of electrical energy [5]. However, with the integration of
information and communication infrastructure, modern power grids have become more
susceptible to various cyberattacks. Therefore, ensuring the timely and precise identification of
potential threats is important, particularly in the context of industrial operations and smart grids,

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to effectively address and minimize risks. Thus, deep learning techniques are commonly used in
such smart grid systems to protect SCADA systems.
The use of Supervisory Control and Data Acquisition systems (SCADA) in critical infrastructure
sectors is extensive. They contribute efficiently to monitoring and controlling industrial
processes, enhancing operational efficiency, maintaining safety and regulatory compliance, and
optimizing resource utilization. SCADA systems are widely employed across various industries,
including energy, water and wastewater management, transportation, manufacturing, and more.
In the context of the smart grid, SCADA is essential for enabling the smart grid to operate
efficiently, reliably, and securely [6]. It provides real-time monitoring, control, and management
capabilities across the electrical grid. Thus, securing the SCADA system from cyber threats is
considered a serious concern. Another issue to consider is the lack of security features in many
ICS/SCADA-oriented protocols like DNP3, widely used in manufacturing processes and
particularly in the utility and energy sectors, including smart grids. Therefore, integrating
technologies into ICS/SCADA systems for protection commonly involves utilizing machine
learning and deep learning to develop an Intrusion Detection System (IDS) [7]. These
technologies aim to enhance the security of ICS/SCADA systems and protect them against
cyberattacks. Currently, there is a growing trend in the utilization of deep learning algorithms for
the purpose of intrusion detection in a SCADA-based smart grid. Moreover, securing the smart
grid from cyber threats is considered a serious concern [8]. Therefore, the implementation of
IDSs has significantly enhanced the efficiency of these intelligent infrastructures by detecting
potential security threats and mitigating their risks [9].
An Intrusion Detection System (IDS) is designed to monitor network traffic and enhance the
security level by promptly identifying and potentially mitigating security threats. The
implementation of IDS is crucial in securing essential networks from the rising challenges
caused by malicious activities. The three components that comprise an IDS architecture are
agents, an analysis engine, and a response module. An IDS can include several agents to monitor
and capture the network activities of one or more systems. Furthermore, the analysis engine
component initiates an investigation into potential cyberattacks. Eventually, when the response
module detects a possible security breach, it notifies the system administrator or security team
[10]. Additionally, one feature of the analysis engine is its ability to incorporate several methods
for detecting cyberattacks. Signature-based and anomaly-based are the two main types of these
mechanisms [11]. Signature-based intrusion detection mostly employs a blacklist approach,
which is limited to identifying unknown attacks, and it’s necessary to update the attack detection
library continuously [12]. On the other hand, the objective of the anomaly-based IDS is to detect
atypical behavioral patterns via the comparison of characteristics between normal and abnormal
activities. An anomaly-based approach is distinguished by its capacity to identify novel forms of
attacks and exhibit reduced long-term costs while maintaining a high level of resilience to
changes in the environment [11]. Typically, this mechanism incorporates techniques derived
from machine learning and deep learning, including decision trees, Artificial Neural Networks
(ANN), and clustering algorithms [10]. Researchers have conducted extensive research in the
field of intrusion detection systems to develop advanced IDSs [13]. Furthermore, the utilization
of intrusion detection technology is a highly efficient method for ensuring the security of a
network. Additionally, an intrusion detection system can be created by utilizing a hybrid
methodology that merges a feature selection model with a proficient classification technique [6].
Smart grids emerged as a result of the integration of digital technology into power systems. This
revolution has raised security concerns, especially regarding the communication networks that
support these systems. The main purpose of this research paper is to develop an efficient hybrid
DL model to enhance the performance of smart grid IDS. This paper's contribution can be briefly
stated as follows:

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• To exploit the power of DL, we proposed a hybrid DL model that combines CNN and
LSTM for smart grid IDS.
• For training and testing our model for binary-class classification, we employed an
intrusion detection dataset, namely DNP3, focusing on unauthorized commands and DoS
cyberattacks against the IEC 60870-5-104 protocol, which is commonly used in smart grid
SCADA systems.
• Furthermore, numerous comprehensive experiments were executed, including
hyperparameter tuning, to verify the effectiveness of the proposed technique for IDS in
smart grids.
• The findings of our proposed approach show significant improvements across key
performance metrics such as accuracy, precision, recall, and F1 score, with an accuracy
rate of 99.50% and a detection rate of nearly 100%.
This paper is organized as follows: Section 2 provides a literature review of related studies.
Section 3 describes the background of deep learning architecture. Section 4 introduces the
proposed CNN-LSTM deep learning model and describes the applied dataset. In Section 5, the
performance evaluation of the model and the result analysis of the experiment are illustrated.
Finally, the conclusion and future work are described in Section 6.
2. RELATED STUDIES
The use of technology is rapidly advancing in today’s organizations. However, the IoT networks
have a certain number of weaknesses in the field; one of them is the scope of security itself. New
technologies must improve the ability to find breaches on the Internet of Things network. Based
on the nature of the input data, the authors of [14] implemented the current solution using
convolutional neural networks (CNNs), which generally offer an appropriate and effective deep
learning method for processing inputs, especially with large numbers of dimensions that a
standard neural network would be ill-equipped to handle. [15] implemented a multi-scale
convolutional neural network (CNN) to automatically classify anatomical MR brain images into
several groups. The approach achieves accurate segmentation details while preserving spatial
consistency thanks to the use of a multi-scale methodology. The research paper [16] proposes a
CNN model that uses binary and multiclass classification for detecting anomalies. The CSE-
CICIDS 2018 dataset includes Advanced Denial of Service (DoS) attacks, including those
targeting the application layer.
Researchers in [17] combined convolutional neural networks (CNNs) and recurrent gated units
(RGUs) to evaluate network traffic patterns and identify anomalous behaviors indicative of
DDoS assaults. Their studies' findings demonstrate how well the suggested hybrid deep-learning
system performs, as evidenced by its 99.86% accuracy rate in identifying DDoS assaults. Abu
Bakar et al. have expanded on earlier work by proposing and designing an IDS system. They
have also tested the suggested architecture under a range of malicious instances, including DDoS
assaults and floods. The suggested technique, fully dispersed, sounds like an early warning siren
when pre-attack actions use network traffic.
The paper [18] provides a new decentralized method that uses Federated Learning (FL) to
identify anomalies in smart grids with a precision that is equivalent to conventional techniques.
To detect unusual usage of power in smart grids, they created FL models. To increase the breadth
of smart grid recognition, the authors of [19] developed a local detection approach based on
CNNs and GRUs, installed it in many isolated branch nodes, and extracted the important stream
data using the technique of attention. For DDoS assaults in the cyber-physical combination of the

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smart grid, [20] suggests an approach fused with a convolutional neural network (CNN) and a
gated recurrent unit (GRU).
[1] offers an anomaly detection approach that can identify abnormalities and categorize
anomalies into specific incident types. The suggested MENSA model integrates two deep neural
networks (DNNs) at the same time: an autoencoder and a generative adversarial network (GAN).
The model provided by [21] applies initial condensed hidden layers to extract the necessary
details from the input data and rebuild the supplied network sample. Using the chosen ideal
threshold, it can accurately identify both known and unknown harm. A CNN-LSTM model was
developed by [23] for smart grid data categorization to calculate the omitted cases in the dataset
using the local quantities about the missing data point, a unique data preliminary processing
technique.
The authors of [27] developed an efficient approach for reproducing the input data at the output
layer with minimal reconstruction error. When anomalies arise, the trained model has a high
error rate and is unable to recreate aberrant occurrences. The system uses mistakes as an
indication to distinguish between typical and anomalous situations. To minimize harm to vital
infrastructure, the research paper [45] suggests a computerized, multifaceted alerting method for
identifying abnormalities in SCADA networks. An approach for the complex identification of
anomalies and reliable gathering of features. The Gated Recurrent Units (GRU) deep learning
technique has been used in [2] to identify DDoS and intrusion attempts in their proposed SDN
defensive system, which depends on the examination of individual IP traffic records.
Accelerating mitigating actions using direct flow inspection reduces the effect of the attack on
the SDN.
The writers of [28] suggest using particle swarm optimization (PSO) to find FDIA in the SG
framework using convolutional neural networks with long short-term memory (CNN-LSTM). It
detects an anomalous monitoring value and identifies the kind of anomaly using phasor
measurement unit (PMU) readings. To detect islanding, the 1D CNN and CNN-LSTM models
are suggested by [41]. This study presents proactive islanding methods for recognizing
coordinated and inverter-based microgrids. To estimate the condition of the power system during
denial-of-service attacks, the researchers in [43] suggest a hybrid adjustment model based on
deep neural networks that also uses a self-regressive model to address the issue of neural system
models' scaling apathy.
The research paper [8] provides a framework that uses a convolutional neural network to create
an equilibrium between two inputs by combining scales of time-series data and network traffic
parameters. The suggested machine learning topology aids in the very precise detection ability of
their anomaly detector. Snort outperformed Suricata in terms of detection precision, as reported
by [333]. According to [39], cutting-edge machine learning (ML) algorithms can anticipate
harmful attack anomalies, which are then used to train security models and forecast any unusual
activity.
3. BACKGROUND
3.1. Deep Learning
Deep learning is a broader field of artificial intelligence that has recently exhibited substantial
achievements in several fields due to its capability to autonomously learn and make decisions.
Deep learning techniques are inspired by the neural networks of the human brain. It utilizes
complicated architectures consisting of multiple layers of interconnected nodes to independently

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learn complex patterns and characteristics in photos, text, audio, and other various data [17].
Moreover, deep learning algorithms autonomously identify complex relationships within
extensive input data, enabling the model to generate predictions or execute tasks without explicit
programming. As a result, deep learning has exhibited notable successes across various fields
such as cybersecurity, natural language processing, and many other autonomous systems [41].
Several deep learning architectures have recently emerged to tackle different tasks. Those
architectures employ multiple hidden layers between the input and output layers to extract more
advanced patterns and characteristics from vast amounts of data. Furthermore, deep learning
employs various architectures and algorithms to efficiently address various types of tasks by
identifying complex patterns in a large amount of data [39]. Notably, CNN and LSTM are the
most widely implemented deep learning architectures in a variety of applications in which the
objective to be predicted is explicitly annotated within the training data.
3.2. Convolutional Neural Network (CNN) for Intrusion Detection
Convolutional Neural Networks (CNNs) are specific types of artificial neural networks that are
inspired by the human visual cortex to recognize objects in real time. The main objective of
using CNNs is to automatically handle and analyze visual data, making the data useful in tasks
such as pattern and image recognition. In general, CNN is defined as a classic neural network
architecture where data flows hierarchically from input to output across a series of
interconnected nodes organized in layers. Convolutional, pooling, and fully-connected layers are
the three key components of building CNN architecture [23]. Due to the capability of CNNs to
automatically learn hierarchical representations from data, they have become a fundamental
aspect in many fields, such as intrusion detection systems (IDSs).
CNNs in intrusion detection can analyze patterns in network traffic and identify unusual
behaviors or potential security risks. The application of CNNs in vital infrastructures such as
smart grids exploits the power of deep learning to improve security aspects. While incorporating
information and communication technologies into traditional power grids has its benefits, there is
an increased risk of various cyber threats and attacks targeting smart grids [7]. The following are
several advantages of utilizing CNNs for smart grid intrusion detection:
• CNNs capability to handle heterogeneous and high-dimensional data makes them highly
suitable for the complex and varied data sources present in smart grids.
• Their capacity to handle substantial volumes of data allows for effective and immediate
analysis of network traffic, ensuring prompt identification and response to any security
breaches.
• CNNs have the capability to acquire knowledge and adjust to evolving attack strategies,
thereby enhancing their resilience against emerging threats.
• CNN-based IDS can decrease the occurrence of false positives by accurately
differentiating between normal network behaviors and malicious actions. This helps to
alleviate the workload of security staff.
• By autonomously acquiring features from the data, CNN-based intrusion detection
systems can decrease reliance on manual feature engineering, which is both time-
consuming and prone to errors [24].
3.3. Long Short-term Memory (LSTM) for Intrusion Detection
Long Short-Term Memory (LSTM) is a specific type of Recurrent Neural Network (RNN) that
was developed to capture long-term temporal dependencies and address the issue of vanishing
gradient difficulties. RNNs' concealed layers are substituted with LSTM units, which encompass

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memory cells and gates. The memory cells retain and store information under the control of the
gates. The input gate, output gate, and forget gate are utilized to regulate the influx or outflow of
information within the memory cell. Before adding new data to each memory cell, the LSTM
network's architecture allows for the historical data to be forgotten from each memory cell [41].
For instance, the forget gate determines, given the previous concealed state and the current input
data, which parts of the cell state are useful at time step t. The forget gate's cell state can have
irrelevant values removed by the LSTM network, while important values can be identified and
updated [25]. LSTMs are highly suitable for processing and analyzing sequential data, making
them especially useful in applications such as time series prediction, natural language processing,
speech recognition, and intrusion detection.
The Intrusion Detection System (IDS) is an essential tool that aims to ensure the availability,
confidentiality, and integrity of data [21]. In fact, deep learning models are effective in dynamic
and vast network environments due to their capacity to extract unique features without relying on
manually designed feature extractions. Consequently, many researchers in smart grids
concentrate on the advancement of IDS that are based on deep learning [22]. In addition, the
LSTM deep learning technique is exceptionally effective and resilient when applied to smart grid
intrusion detection systems [23]. LSTM demonstrates efficacy in capturing and evaluating
temporal relationships in the data, rendering it highly suitable for detecting abnormalities and
potential security breaches in the realm of smart grids. By exploiting the capabilities of LSTM,
the intrusion detection system can improve its capacity to identify and react to cyber threats in
the everchanging and dynamic environment of smart grids [24]. The following are some
advantages of adopting LSTM in smart grid intrusion detection:
• Long Short-Term Memory (LSTM) networks demonstrate proficiency in representing
temporal dependencies in data, enabling them to accurately capture the sequential patterns
and temporal relationships inherent in smart grid activities. The identification of potential
anomalies or intrusions that may occur over time is of utmost importance [14].
• Time series data, such as energy usage patterns and variations in the condition of the grid,
are frequently included in smart grid data. Thus, LSTM's ability to handle time-dependent
data makes it useful for identifying anomalous patterns or behaviors that could be signs of
an intrusion [25].
• The LSTM architecture incorporates memory cells capable of retaining and transmitting
substantial information from the early stages of the network to the final stage. This
functionality facilitates the network's capacity to preserve long-term dependencies within
Smart Grid data, hence improving its capability to identify tiny deviations or anomalies
[23].
• LSTM models are highly efficient in processing sequential data, enabling real-time
intrusion detection within smart grids. Quick identification and response to security threats
is crucial for avoiding any potential disruptions [26].
• In RNN models, improperly assigned weights can cause vanishing and expanding gradient
issues. LSTMs effectively address the common issue of vanishing gradients in RNNs,
facilitating more efficient training on complex smart grid data [27].
4. PROPOSED HYBRID MODEL
4.1. System Description
Figure 1 illustrates the proposed hybrid deep-learning model for the Intrusion Detection System
(IDS). The proposed hybrid model combines the Convolutional Neural Network model (CNN)
and the Long Short-Term Memory model (LSTM) to develop an advanced Deep Learning (DL)

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technique to detect various types of cyberattacks. CNN is chosen to be applied due to its ability
to capture position-invariant features. This position-invariant property is particularly valuable for
tasks where the precise location of a feature or object in an image may vary, such as object
recognition in computer vision, where objects can appear at different positions and orientations
in images [17]. On the other hand, LSTM is a special type of RNN that adds some specific gate
structures, including forgetting gates, input gates, and output gates. Furthermore, when compared
to RNN with a single gate, LSTM offers a more robust technique for retaining short-term
memories while also not losing long-term dependencies. In addition, designing an intrusion
detection system model that combines CNN and LSTM is a powerful approach that allows for
the extraction of both spatial features using CNNs and temporal dependencies using LSTMs
[28].
For the purpose of strengthening the network, the algorithm architecture is equipped with two
LSTM blocks and three CNN blocks. The convolution layer is responsible for extracting features
from the input data and generating a feature map. To capture the feature mapping, the
convolutional network multiplies the convolutional kernel by the input data, and then a non-
linear activation function is applied to the feature map. The weights and biases in the
convolutional kernel are initialized randomly [12]. Each CNN layer is followed by a max-
pooling layer. The max-pooling operation creates a down-sampled version of the input feature
map by selecting the maximum value from each feature within a certain area. In the
concatenation layer, the final flattened output of CNN and the output of LSTM are combined.
The concatenation layer is followed by a fully connected layer. The purpose of adding a dropout
layer after the fully connected layer is to avoid overfitting. To convert the output to a probability
distribution, the classification layer is linked to the SoftMax layer. This enables the classification
layer to generate precise predictions regarding the different types of labels [20]. Eventually, the
model is trained and tested using the DNP3 intrusion detection dataset.

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Figure 1. Proposed CNN–LSTM hybrid model
4.2. Dataset Description
Table 1. Samples for training and testing the model.
Type Total Samples Training Samples Test Samples Label
Normal 666 466 200 0
Attack 5,328 3,728 1600 1
DNP3 is widely utilized as a SCADA communication protocol, and its popularity has grown,
particularly in the context of smart grids. Thus, an intrusion detection dataset from
ITHACAUniversity of Western Macedonia (DNP3) [29] is applied to train and test our hybrid
DL model for smart grid IDS. This dataset is publicly available and contains a wide range of
normal and DNP3 attack scenarios that meet real-world criteria. Denial of Service (DoS) and
unauthorized DNP3 commands are the focus of these malicious attacks. Based on flow features
such as time stamps, source and destination IPs, source and destination ports, protocols, and
attacks, the network traffic analysis is generated and included in this dataset by utilizing
CICFlowMeter with labeled flows. Additionally, a custom DNP3 Python parser is also used for
parsing and analyzing DNP3 communication packets within Supervisory Control and Data
Acquisition (SCADA) and industrial control systems to ensure the security and reliability of
critical infrastructure. The dataset generated consisted of 40,420 network flows, each containing
99 features. There were a total of nine labels utilized, consisting of eight attack labels and one
normal flow label. Consequently, this dataset may be utilized to develop AI-powered Intrusion
Detection and Prevention (IDPS) systems based on ML and DL techniques.

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Data cleaning is the first step in preparing the dataset to be suitable for binary and multi-class
classification using machine learning and deep learning methods. The features are then converted
into numerical features and incorporated into the dataset along with any other numerical features.
Furthermore, the labels in the dataset are numerically encoded, with the label "Normal"
represented by 0 and the other DNP3 cyberattack labels such as “DNP3_ENUMERATE” and
STOP_APP represented by 1. To reduce the feature variations, the dataset was uniformly
normalized and mapped within the range of [0, 1]. The decision to consider all features and not
perform feature selection has been made due to the absence of irrelevant features in the dataset,
as shown in Figure 2, and based on the belief that each feature contributes valuable information
to the model. Furthermore, the model's decision-making process is influenced by all available
features in the dataset because omitting any might lead to a loss of relevant information or
compromise the model's performance.
A normalization procedure has been applied to the dataset to bring the numerical values of
different features onto a similar scale. In addition, the applicable dataset has a total of 99
columns with 5994 records. Each record is identified and labeled as an attack or not, where 1
represents the attack labels and 0 represents the normal labels. As illustrated in Table 1, the
dataset is split into a training set and a testing set with a ratio of 70:30. The model is trained
using 70% of the data, while the remaining 30% of the data is allocated for validation and testing
after the training is completed.
• The following are the components of the confusion matrix that are used to calculate
various performance metrics for the hybrid model classifier:
• True Positive (TP): This denotes a correct prediction by the algorithm when the instance is
classified as positive, and it’s truly positive.
• True Negative (TN): This denotes a correct prediction by the algorithm when the instance
is classified as negative, and it’s truly negative.
• False Positive (FP): This denotes a wrong prediction by the algorithm when the instance is
classified as positive, but it is negative.
• False Negative (FN): This denotes a wrong prediction by the algorithm when the instance
is classified as negative, but it’s positive.
The four metrics that are utilized to evaluate the hybrid model's performance are represented
mathematically as in [18, 20, 28, 17] and written in subsequent equations as follows:
𝑇𝑃 + 𝑇𝑁
𝐴𝑐𝑐𝑢𝑟𝑎𝑐𝑦 =
𝑇𝑃 + 𝑇𝑁 + 𝐹𝑃 + 𝐹𝑁
𝑇𝑃
𝑃𝑟𝑒𝑐𝑖𝑠𝑖𝑜𝑛 =
𝑇𝑃 + 𝐹𝑃

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Figure 2. The dataset correlation map
5. EXPERIMENTS AND RESULTS
To develop a reliable intrusion detection model, it is necessary to preprocess the large dataset
first. After preparing the dataset, it has been applied to the proposed model and to different
standalone deep learning models, such as CNN and LSTM. The experiments were conducted in
the Python programming language on Jupyter Notebook, and Keras was employed as a deep
learning framework. I have executed many experiments with various hyperparameters to get
better results. The primary goal of hyperparameter tuning was to enhance the performance of the
deep neural network on the chosen dataset.
The optimal selection of hyperparameters is crucial for building a successful neural network
architecture, as the performance of the trained model depends on these values. Therefore, we
must consider various hyperparameters when initiating effective deep learning classifiers for
intrusion detection systems. Thus, I have assessed the model's performance by carefully varying
hyperparameter values such as batch size, epochs, and learning rate. By applying the
hyperparameter values illustrated in Table 2, I have successfully enhanced the performance of
our intrusion detection model. After conducting various experiments, I realized that the learning
rate clearly affects the performance of deep learning models. Even though a high learning rate
can lead to faster convergence during training, it's more likely to be susceptible to the risk of
overshooting the optimal solution. Thus, Adam (Adaptive Moment Estimation) was utilized as
an adaptive learning rate optimizer. Moreover, a learning rate of 0.0001 consistently delivers
strong performance, prevents overshooting, and improves model performance across different
datasets. It is also critical to select the optimal number of epochs to effectively train a deep
learning model. Overfitting can occur when the model learns noises and exhibits poor
performance when applied to unseen data. We prevented underfitting and overfitting by applying
epochs between 50 and 100 during our training process. An increased batch size provides the
potential to capture a greater number of global patterns, which can speed up the training process.

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However, a large patch size increases computational complexity and memory demands. As a
result, a patch size in the range of 16 and 32 was appropriate for our model and resulted in a high
rate of accuracy. In addition, with experimentation with different dropout rates, I figured out that
a dropout rate of 0.5 is the optimal value for our model and dataset, and it can help correct
overfitting. When dealing with datasets that contain complex patterns, it’s recommended to
increase the number of convolutional layers, which results in improved performance. However,
larger convolutional layers often include more parameters and computations, resulting in higher
computational costs and memory consumption during training and inference. Hence, to achieve
the best results, we propose employing three convolutional layers. We employed 64 and 128
LSTM units in our model, considering factors like model performance, computational efficiency,
and potential overfitting.
Table 2. Hyperparameters for our model.
Parameter Value
Learning rate 0.0001
Epoch 50 to 100
Batch size 16 to 32
Optimizer Adam
Dropout rate 0.5
Convolutional layers 3
LSTM units 64, 128
Figure 3. illustrates the performance of the proposed approach compared to existing algorithms
in terms of accuracy, precision, recall, and f1-score. I have assessed the model's performance by
carefully varying hyperparameter values such as batch size, epochs, and learning rate. By
applying the hyperparameter values illustrated in Table 2, I have successfully enhanced the
performance of our intrusion detection model. The results demonstrate that the algorithm we
suggest achieves high levels of accuracy, precision, recall, and f1-score, specifically 99.50%,
99.51%, 99.93%, and 99.72%, respectively. The CNN exhibits an accuracy of 99.33%, a
precision of 99.50%, a recall of 99.75%, and a f1-score of 99.62%. On the other hand, the LSTM
model achieved 94.39% accuracy, a precision of 93.82%, a recall of 99.94%, and a f1-score of
96.72%. Noticeably, the proposed CNN-LSTM hybrid model demonstrated superior
performance compared to the comparison algorithms in all categories, except for the recall
category. The CNNLSTM algorithm's recall dropped because of the increased FN value
compared to the LSTM algorithm, which plays a crucial role. For clarification, the CNN-LSTM
algorithm achieved an FN percentage of 0.18, while the LSTM achieved an FN percentage of
0.06. In terms of intrusion detection, the proposed algorithm provides distinctive performance
compared to the existing algorithms (see Table 3).

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Figure 3. Performance Comparison of the considered algorithms
Table 3. Comparison with relevant works.
The validation loss metric is used to assess how well the model performs on unseen data during
training. In this context, a lower validation loss indicates better performance, as it means the
model is making more accurate predictions on new data. The proposed CNN-LSTM algorithm
achieved its best validation performance, with a validation loss of 0.0155, at the 39th epoch. The
CNN algorithm performed better than the LSTM algorithm, achieving a validation loss of 0.0172
at the 39th epoch, while the LSTM algorithm achieved its best validation performance, with a
loss of 0.1660 at the 49th epoch (see Figures. 4, 5, and 6). Overall, lower validation loss values
indicate better model performance when generating predictions on new data, and the epoch at
which these low validation loss values are obtained indicates when the model is at its most
accurate. Additionally, the comparison with CNN and LSTM algorithms demonstrates the
superiority of the CNN-LSTM hybrid architecture in generalizing unseen data, as it
outperformed both standalone CNN and LSTM models in terms of validation loss.

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Figure 4. Validation Performance for the proposed CNN-LSTM
Figure 5. Validation Performance for the CNN
Figure 6. Validation Performance for the LSTM
6. CONCLUSION AND FUTURE WORK

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Securing smart grid communication networks is crucial since electricity systems are becoming
more digital. Smart grids that rely on SCADA are capable of gathering and controlling data in
real-time because of Distributed Network Protocol 3 (DNP3) and other protocols. Robust
intrusion detection systems are essential for early threat identification and mitigation since these
connected networks are vulnerable to different cyberattacks. In this paper, a hybrid DL model
specifically designed for intrusion detection in smart grids is proposed to address the problem of
protecting smart grid communication networks. By combining the CNN and LSTM algorithms,
we have developed a deep learning model for detecting intrusions in smart grid systems. The
model was trained and tested using a recent intrusion detection dataset that focused on DNP3.
Therefore, our proposed approach performed effectively in detecting DNP3 unauthorized
commands and DoS cyberattacks on the DNP3 Intrusion Detection dataset. In addition, our
hybrid CNN-LSTM model performed well in detecting and classifying intrusions, achieving high
performance rates across various metrics. Exploiting the power of deep learning, the model
obtained a high accuracy rate of 99.50%, precision of 99.51%, recall of 99.93%, and F1score of
99.72%. Furthermore, superior generalization was exhibited by our model on unseen data,
reflected by low validation loss values. Overall, the result of our study demonstrates the
effectiveness of using deep learning approaches, particularly hybrid architectures, for IDS in
complex smart grid environments.
Our future work will focus on enhancing and examining the proposed model's performance by
combining various DL techniques and expanding the performance analysis. Moreover, different
intrusion detection datasets will be applied to our DL model, such as IEC 60870-5-104, which
contains cyberattack activities against the IEC 60870-5-104 communication protocol, which is
widely used in smart grid SCADA. In addition, we aim to improve the model's performance and
reduce the manual effort required for hyperparameter tuning. This is achieved by applying
hyperparameter optimization techniques such as Bayesian optimization, genetic algorithms, or
reinforcement learning-based approaches. Eventually, several strategies and techniques will be
investigated to enhance computational and memory consumption without compromising the
accuracy and effectiveness of our intrusion detection model.
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