基于等效内电势重塑的构网型逆变器故障穿越控制策略

Fault Ride-Through Control Strategy for GFM Inverters Based on Equivalent Internal Potential Reshaping

中文关键词:故障穿越  构网  等效内电势重塑

keywords:fault ride-through  grid-forming  equivalent internal potential reshaping

中文摘要:针对常规构网型（grid-forming ，GFM）逆变器在故障穿越期间采用将电压源切换至电流源的控制策略，无法为电网提供必要的频率电压支撑的问题，提出了一种基于等效内电势重塑与附加虚拟阻抗的故障构网控制策略，阐述了基本工作原理，并给出了关键控制方程。仿真和实验结果表明：所提出的故障构网控制策略不仅可实现故障穿越期间的电压源运行特性，并可在故障暂态期间有效抑制暂态过电流，充分验证了所提控制策略的正确性和有效性。

Abstract:Conventional grid-forming （GFM） inverters adopt a control strategy which switches from a voltage-source to a current-source during fault ride-through， depriving the power grid of the frequency and voltage support it requires. To overcome this limitation， based on equivalent internal potential reshaping and additional virtual impedance， a novel fault ride-through control strategy for GFM inverters is proposed， and the fundamental operating principle is elaborated and the key control equations are provided. Simulation and experimental results indicate that the proposed control strategy can not only maintain the voltage source characteristics during fault ride-through， but also effectively suppress transient overcurrent during the fault transient period， fully validating the correctness and effectiveness of the proposed control strategy.