基于模糊控制的自适应虚拟同步发电机控制策略

为了解决分布式能源与电力系统兼容的问题,采用虚拟同步发电机(virtual synchronous generator,VSG)技术,将同步发电机的虚拟惯量和阻尼系数引入逆变器控制,以提高系统的频率响应特性和电网应对扰动能力。在此基础上,提出一种基于模糊算法的自适应VSG虚拟惯量和阻尼系数控制策略。根据同步发电机角频率变化率和角频率偏差的变化规律,重新设计模糊规则调节虚拟惯量和阻尼系数,以提高VSG的控制效果。仿真结果表明,该策略能够合理地抑制瞬态过程中VSG频率和功率的波动,维持电网的稳定运行。

Adaptive Virtual Synchronous Generator Control Strategy Based on Fuzzy Control

In order to solve compatibility between the distributed energy and the power system,virtual synchronous generator(VSG)technology was used to introduce the virtual inertia and damping coefficient of the synchronous generator into control of the inverter to improve system frequency response characteristics and anti-interference ability of the power grid.On this basis,this paper proposes an adaptive control strategy of virtual inertia and damping coefficient for VSG based on fuzzy algorithm.According to the variation regulation of angular frequency deviation and angular frequency change rate of the synchronous generator,it redesigns fuzzy rules to adjust virtual inertia and damping coefficient to enhance dynamic response of VSG.The simulation results show that this strategy can effectively suppress fluctuations in VSG frequency and power fluctuation during the transient process and maintain stable operation of the power grid.