改进bang bang控制的微网VSG自适应虚拟惯量控制策略

研究并网逆变器虚拟同步机(virtual synchronous generator, VSG)控制策略在有新能源接入的电力系统中的频率稳定性问题.利用虚拟惯量的可变性,减少频率超调量并加快频率响应速度,提出一种基于改进bang-bang控制的微网VSG自适应虚拟惯量控制策略.首先,在bang-bang控制的基础上,设定一个频率稳态区间与稳态惯量.然后,通过建立微网孤岛运行模式下的VSG小信号模型,对虚拟惯量进行稳定性分析,确定虚拟惯量的取值范围及稳态惯量.最后,用Matlab/Simulink进行仿真实验,对比多种虚拟惯量控制策略,验证了所提策略的有效性.

Adaptive virtual inertia control strategy of VSG for micro grid based on improved bang bang control strategy

The frequency stability of VSG (virtual synchronous generator) control strategy of grid connected inverter in power system with new energy access is studied. The variability of virtual inertia is utilized to reduce frequency overshoot and speed up frequency response. An adaptive virtual inertia control strategy of VSG for microgrid based on improved bang-bang control is proposed. First, a steady-state frequency interval and a steady state of inertia are set. Then, through the establishment of a small signal model of VSG in the microgrid island mode, the stability analysis of the virtual inertia is carried out to determine the value range of the virtual inertia and the steady-state inertia. Finally, Matlab/Simulink is applied to carry out simulation experiments, and various virtual inertia control strategies are compared to verify the effectiveness of the proposed strategy.