研究目的
To propose an energy management and coordinated control strategy for an islanded AC microgrid with a hybrid energy storage system (HESS) to ensure reliable operation, prevent battery overcharging and over-discharging, achieve effective power sharing, and maintain voltage stability.
研究成果
The proposed energy management and coordinated control strategy effectively manages power flow in an islanded AC microgrid with HESS, preventing battery overcharging and over-discharging, achieving proper power sharing between battery and supercapacitor, and maintaining voltage stability. Simulation results confirm the strategy's correctness and effectiveness under various operating conditions, suggesting potential for improved battery life and system reliability.
研究不足
The study is based on simulation results, which may not fully capture real-world complexities and uncertainties. Practical implementation challenges, such as hardware limitations, communication delays, and environmental factors, are not addressed. The control strategies assume ideal conditions and may require further optimization for robustness in actual microgrids.
1：Experimental Design and Method Selection:
The study uses simulation-based experiments in MATLAB/Simulink's SimPowerSystem to model and test the proposed control strategies for a PV/HESS AC microgrid. Theoretical models include virtual impedance control, MPPT and LPT algorithms, and PI controllers for voltage and current regulation.
2：Sample Selection and Data Sources:
The system configuration includes PV arrays, battery, supercapacitor, various loads, and converters. Parameters such as solar irradiance and load power are varied to simulate different operating conditions.
3：List of Experimental Equipment and Materials:
The simulation uses components modeled in software, including boost converters, bidirectional DC/DC converters, voltage source inverters, filters, and control algorithms. Specific parameters are listed in Table I of the paper.
4：Experimental Procedures and Operational Workflow:
The simulation involves setting initial conditions, applying changes in solar irradiance and load power, and observing the response of the system under different scenarios (normal operation, SOC upper limit, SOC lower limit). Control strategies are implemented for PV converters, HESS converters, and load shedding.
5：Data Analysis Methods:
Results are analyzed through graphical outputs of power, SOC, voltages, and currents to verify the effectiveness of the control strategies in maintaining power balance, voltage stability, and battery protection.
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