研究目的
To solve the problem of system frequency instability when the photovoltaic and energy-storage microgrid (PV-ESM) operates under a conventional droop or virtual synchronous generator (VSG) control and the load is disturbed violently.
研究成果
The proposed improved frequency support strategy of EPSP for VSG based on power feed-forward, which includes a first order differential control block of high-pass filter added to power feedback link, effectively supports frequency recovery rapidly when frequency instability is induced by load mutation and ensures the quality of power supply in a typical off-grid PV-ESM scenario in an industrial park.
研究不足
The study focuses on a typical off-grid PV-ESM scenario in an industrial park. The applicability of the proposed strategy to other scenarios or larger systems is not discussed.
1：Experimental Design and Method Selection:
The feedback loop control strategy of the ESPS with a first order differential control links of high-pass filter is proposed to optimize energy storage power station (ESPS) dynamic power response. An improved VSG frequency adjustment strategy based on feedforward power is proposed to support power frequency actively by EPSP power adjustment.
2：Sample Selection and Data Sources:
A typical off-grid PV-ESM scenario in an industrial park is taken as an example.
3：List of Experimental Equipment and Materials:
The PV-ESM system model in industrial park was built in MATLAB/Simulink. The system includes photovoltaic generation units, ESPS, and loads.
4：Experimental Procedures and Operational Workflow:
The system is specified to operate in off-grid mode. The effectiveness of the proposed strategy is verified by simulation.
5：Data Analysis Methods:
The simulation results are analyzed to show the effectiveness of the proposed strategy in supporting frequency recovery rapidly when frequency instability is induced by load mutation.
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