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Rule-Based Energy Management Strategy for Hybrid Electric Road Train
... The rule-based method has demonstrated promising results in numerous applications [39], including grid-based energy management systems (EMSs), RESs, and battery energy resources. It is also employed in the switching procedure of the EMS strategy in train applications [40]. The rule-based approach is appropriate for deciding the operating strategy of equipment in an energy system during a day, month, or year based on stated and pre-determined rules [41]. ...
... Rule-based Control Systems: Our study aligns with previous research indicating that rule-based control systems effectively manage energy consumption and storage within smart buildings [11,49]. However, while traditional rule-based systems are suitable for basic energy management tasks, they may struggle to adapt to unforeseen circumstances or optimize energy usage based on historical data alone [40]. Our findings confirm these observations. ...
Microgrids (MGs) have evolved as critical components of modern energy distribution networks, providing increased dependability, efficiency, and sustainability. Effective control strategies are essential for optimizing MG operation and maintaining stability in the face of changing environmental and load conditions. Traditional rule-based control systems are extensively used due to their interpretability and simplicity. However, these strategies frequently lack the flexibility for complex and changing system dynamics. This paper provides a novel method called hybrid intelligent control for adaptive MG that integrates basic rule-based control and deep learning techniques, including gated recurrent units (GRUs), basic recurrent neural networks (RNNs), and long short-term memory (LSTM). The main target of this hybrid approach is to improve MG management performance by combining the strengths of basic rule-based systems and deep learning techniques. These deep learning techniques readily enhance and adapt control decisions based on historical data and domain-specific rules, leading to increasing system efficiency, stability, and resilience in adaptive MG. Our results show that the proposed method optimizes MG operation, especially under demanding conditions such as variable renewable energy supply and unanticipated load fluctuations. This study investigates special RNN architectures and hyperparameter optimization techniques with the aim of predicting power consumption and generation within the adaptive MG system. Our promising results show the highest-performing models indicating high accuracy and efficiency in power prediction. The finest-performing model accomplishes an R2 value close to 1, representing a strong correlation between predicted and actual power values. Specifically, the best model achieved an R2 value of 0.999809, an MSE of 0.000002, and an MAE of 0.000831.
Using renewable energy sources (RESs) has increased extensively to minimize global warming and greenhouse gases. This increase in the adoption of RESs has brought a considerable alteration in the topologies of traditional power networks to become novel power networks along with microgrids (MGs). An MG can be defined as a system integrating different types of energy sources and control devices. Nevertheless, the controllability of an MG is not straightforward. ε-Variable-based propositional logic control (P-PLC) strategies are practical techniques for designing control strategies in MGs. The P-PLC method makes the control structure more flexible. However, this method is not optimal. On the contrary, switched rule-based control (S-RBC) is a more effective and advanced method to control an MG than other control techniques. Nonetheless, the implementation of the S-RBC is not straightforward. To address these issues, this work suggests a novel systems approach method called the extended optimal P-PLC, created by integrating the P-PLC-based control method with the S-RBC method. This novel technology revealed a considerable improvement in optimizing an MG’s energy management and enhanced the efficiency and performance of the MG’s control structure. These case studies demonstrate that the suggested extended optimal P-PLC method (i) reduces the operational cost of MG by roughly 28%, (ii) increases the photovoltaic (PV) utilization by nearly 45%, and (iii) penalizes the accumulators to prevent charging from the grid. By converting the results of S-RBC to the P-PLC method, our novel extended optimal P-PLC considerably improves the efficiency and performance of the MG’s control structure.
With the rapid developments of electric vehicles (EVs) in recent years, it is desirable to improve the energy efficiency to prolong the limited life of battery and extend the cruising range of EVs. In real EVs, the battery thermal management system is installed to cool the battery and maintain the expected high power output. In this article, we propose a novel energy management strategy based on deep reinforcement learning (DRL) considering battery thermal effects on energy efficiency. The main idea is to formulate energy management as an optimization problem, further extract the state sequence features of the vehicle via gated recurrent unit (GRU), and finally, propose a double deep
Q
network (double DQN)-based algorithm to obtain the optimal strategy. Comparisons of our double DQN algorithm and existent fuzzy control, as well as two other conventional reinforcement learning (RL) algorithms, are conducted under New European Driving Cycle, FTP-75, HWFET, and US06 cycles, and the results demonstrate that the proposed algorithm achieves an energy reduction of more than 6.7% during aggressive driving.
Presence of an alternative energy source along with the Internal Combustion Engine (ICE) in Hybrid Electric Vehicles (HEVs) appeals for optimal power split between them for minimum fuel consumption and maximum power utilization. Hence HEVs provide better fuel economy compared to ICE based vehicles/conventional vehicle. Energy management strategies are the algorithms that decide the power split between engine and motor in order to improve the fuel economy and optimize the performance of HEVs. This paper describes various energy management strategies available in the literature. A lot of research work has been conducted for energy optimization and the same is extended for Plug-in Hybrid Electric Vehicles (PHEVs). This paper concentrates on the battery powered hybrid vehicles. Numerous methods are introduced in the literature and based on these, several control strategies are proposed. These control strategies are summarized here in a coherent framework. This paper will serve as a ready reference for the researchers working in the area of energy optimization of hybrid vehicles.
Presence of an alternative energy source along with the Internal Combustion Engine (ICE) in Hybrid Electric Vehicles (HEVs) appeals for optimal power split between them for minimum fuel consumption and maximum power utilization. Hence HEVs provide better fuel economy compared to ICE based vehicles/conventional vehicle. Energy management strategies are the algorithms that decide the power split between engine and motor in order to improve the fuel economy and optimize the performance of HEVs. This paper describes various energy management strategies available in the literature. A lot of research work has been conducted for energy optimization and the same is extended for Plug-in Hybrid Electric Vehicles (PHEVs). This paper concentrates on the battery powered hybrid vehicles. Numerous methods are introduced in the literature and based on these, several control strategies are proposed. These control strategies are summarized here in a coherent framework. This paper will serve as a ready reference for the researchers working in the area of energy optimization of hybrid vehicles.
The gradual decline in global oil reserves and presence of ever so stringent emissions rules around the world, have created an urgent need for the production of automobiles with improved fuel economy. HEVs (hybrid electric vehicles) have proved a viable option to guaranteeing improved fuel economy and reduced emissions. The fuel consumption benefits which can be realised when utilising HEV architecture are dependent on how much braking energy is regenerated, and how well the regenerated energy is utilised. The challenge in developing an HEV control strategy lies in the satisfaction of often conflicting control constraints involving fuel consumption, emissions and driveability, without over-depleting the battery state of charge at the end of the defined driving cycle.
As a result, a number of power management strategies have been proposed in literature. This paper presents a comprehensive review of these literatures, focusing primarily on contributions in the aspect of parallel hybrid electric vehicle modelling and control. As part of this treatise, exploitable research gaps are also identified. This paper prides itself as a comprehensive reference for researchers in the field of hybrid electric vehicle development, control and optimisation.
The series hybrid electric tracked bulldozer (HETB)’s fuel economy heavily depends on its energy management strategy. This paper presents a model predictive controller (MPC) to solve the energy management problem in an HETB for the first time. A real typical working condition of the HETB is utilized to develop the MPC. The results are compared to two other strategies: a rule-based strategy and a dynamic programming (DP) based one. The latter is a global optimization approach used as a benchmark. The effect of the MPC’s parameters (e.g. length of prediction horizon) is also studied. The comparison results demonstrate that the proposed approach has approximately a 6% improvement in fuel economy over the rule-based one, and it can achieve over 98% of the fuel optimality of DP in typical working conditions. To show the advantage of the proposed MPC and its robustness under large disturbances, 40% white noise has been added to the typical working condition. Simulation results show that an 8% improvement in fuel economy is obtained by the proposed approach compared to the rule-based one.
An appropriate energy management strategy is able to further improve the fuel economy of PHEVs. The rule-based energy management algorithms are dominated in industry due to their fast computation and ease of establishment potentials, however, their performance differ a lot from improper setting of parameters and control actions. This paper employs the dynamic programming (DP) to locate the optimal actions for the engine in PHEVs, and more importantly, proposes a recalibration method to improve the performance of the rule-based energy management through the results calculated by DP algorithm. Eventually, an optimization-based rule development procedure is presented and further validated by hardware-in-loop (HIL) simulation experiments. The HIL simulation results show that, the improved rule-based energy management strategy reduces fuel consumption per 100 km from 25.46 L diesel to 22.80 L diesel. The main contribution of this study is to explore a novel way to calibrate the existed heuristic control strategy with the global optimization result through advanced intelligent algorithms.
The issues of global warming and depletion of fossil fuels have paved opportunities to electric vehicle (EV). Moreover, the rapid development of power electronics technologies has even realized high energy-efficient vehicles. EV could be the alternative to decrease the global green house gases emission as the energy consumption in the world transportation is high. However, EV faces huge challenges in battery cost since one-third of the EV cost lies on battery. This paper reviews state-of-the-art of the energy sources, storage devices, power converters, low-level control energy management strategies and high supervisor control algorithms used in EV. The comparison on advantages and disadvantages of vehicle technology is highlighted. In addition, the standards and patterns of drive cycles for EV are also outlined. The advancement of power electronics and power processors has enabled sophisticated controls (low-level and high supervisory algorithms) to be implemented in EV to achieve optimum performance as well as the realization of fast-charging stations. The rapid growth of EV has led to the integration of alternative resources to the utility grid and hence smart grid control plays an important role in managing the demand. The awareness of environmental issue and fuel crisis has brought up the sales of EV worldwide.
