基于动态虚拟复阻抗的微网下垂控制策略

Droop Control Method Based on Dynamic Virtual ComplexImpedance for Microgrid

  • 摘要: 输出功率均分与系统间环流抑制是并联逆变器控制的热点问题。由于低压微网系统输电线路以阻性为主,将逆变器自身输出阻抗设计呈以阻性为主,使微网系统等效输出阻抗呈阻性,提升了有功电压无功频率PV-QF下垂方式的适用性,实现了有功功率与无功功率的解耦控制。在分析环流的产生和影响因素后,提出动态虚拟复阻抗方法对输出电压进行动态反向调整,从而对环流进行抑制,并提高系统动态响应,减小了并联冲击。最后通过搭建仿真模型,验证了所提方法的可行性。

     

    Abstract: Output power sharing and circulating current suppression have been the main subjects for parallel inverters. The equivalent output impedance of the inverters is designed to be resistive using dynamic virtual complex impedance, which can improve applicability of selected PV-QF droop control and decouple the active power and reactive power. The dynamic virtual complex impedance method is proposed to further suppress the circulating current and improve performance of the power sharing and dynamic response after analyzing the generation and influencing factors of the circulating current. The feasibility of the proposed method is verified by the simulation.

     

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