【摘要】 微电网中分布式电源（distributed generation,DG）一般通过电力电子变流器接口接入，降低了微电网惯性。而虚拟同步发电机（virtual synchronous generator,VSG）可为微电网提供惯量支撑，但由于对负载变化响应速度不一致，多个采用VSG的DG间会产生功频振荡，甚至可能造成微电网失稳。针对以上问题，提出考虑一致性二阶项的含多VSG微电网功频振荡抑制策略。首先建立了基于一阶一致性的含多VSG微电网二次控制策略，利用小信号分析法研究了多VSG之间产生功率振荡机理，然后通过引入一致性二阶项，为功频振荡提供阻尼，并采用自适应梯度算法优化二阶控制系数，提高抑制作用。最后，通过仿真算例，验证分析了策略的可行性。更多还原

【Abstract】 Distributed generation(DG)in microgrid is generally connected through power electronic converter interface, which reduces the inertia of microgrid. The virtual synchronous generator(VSG)can provide inertia support for the microgrid. However, due to the inconsistent response speed to load changes, power frequency oscillation will occur between multiple DGs using VSG, and even cause the instability of the microgrid. To solve the above problems, a power frequency oscillation suppression strategy for microgrid with multiple VSGs is proposed considering the consistent second-order term. Firstly, the secondary control strategy of microgrid with multiple VSGs based on first-order consistency is established, and the mechanism of power oscillation between multiple VSGs is studied by using small signal analysis method. Then, the second-order term of consistency is introduced to provide damping for power frequency oscillation, and the adaptive gradient algorithm is used to optimize the second-order control coefficient to improve the suppression effect. Finally, the feasibility of the strategy is verified by a simulation example.更多还原