基于小信号稳定性分析的含VSG微电网电能质量主动控制

为提高分布式电源电力电子变换装置的利用率，实现变流器的功率控制，提高电能质量，文中提出一种基于小信号稳定性分析的含虚拟同步发电机(VSG)微电网的电能质量主动控制策略，在原有双闭环控制器基础上，设计参数化控制器进行谐波抑制，实现控制性能指标的改进。首先，建立基于微电网拓扑的VSG小信号模型，并分析VSG控制过程的稳定性。其次，设计了基于鲁棒观测器的控制器，以电能质量性能指标跟踪误差最小为目标函数，利用优化方法对跟踪误差进行逐步最优求解。通过MATLAB/Simulink对所提控制策略进行仿真，结果表明:所提出的方法实现了变流器鲁棒控制和电能质量治理，性能改善作用明显。

Active Power Quality Control for Microgrid with Virtual Synchronous Generator Based on Small-signal Stability Analysis

In order to improve the utilization rate of power electronic converter of distributed generator and realize the power control of converters, and improve the power quality, this paper proposes an active power quality control strategy for microgrid with virtual synchronous generator based on small-signal stability analysis. Based on the original dual closed-loop controller, a parameterized controller is designed for harmonic suppression, which improves the control performance indices. Firstly, a small-signal model of virtual synchronous generator(VSG)based on the topology of microgrid is established, and the stability in the control process of VSG is analyzed. Secondly, a controller based on robust observer is designed. Taking the minimum tracking error of performance index of power quality as the objective function, the tracking error is solved by the optimization method step by step. Finally, the control strategy is simulated on MATLAB/Simulink. The results show that the proposed method achieves robust control and power quality control of the converter, and has obvious performance improvement.