基于改进虚拟同步发电机的逆变器并网控制研究  

Research on Grid-connected Control of Inverter Based on Improved Virtual Synchronous Generator

作　　者：王秀云[1] 陈清沅 WANG Xiuyun;CHEN Qingyuan(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012)

机构地区：[1]东北电力大学电气工程学院,吉林132012

出　　处：《电气工程学报》2024年第4期267-274,共8页Journal of Electrical Engineering

基　　金：吉林省科技发展计划资助项目(20220101254JC)。

摘　　要：针对虚拟同步发电机(Virtual synchronous generator,VSG)在电网扰动过程中的有功和频率振荡问题,提出一种改进的VSG自适应有功控制方法。该控制策略是通过补偿频率的差额量,再将补偿量叠加到原有的有功功率输出上,加速VSG有功功率指令值的追踪,减少暂态过程中有功功率的不平衡超调。在此基础上,与VSG的自适应协调控制相结合,该自适应控制较传统控制方法更能发挥出逆变器参数灵活可调的优势,根据VSG角速度变化量实时进行下垂系数、惯量系数和阻尼系数的自适应调节,进一步改善有功和频率振荡问题。最后通过Matlab/Simulink仿真验证所提控制策略的有效性和优越性。The virtual synchronous generator(VSG)can bring inertia and damping to the grid-connected system,but it also brings the problem of active power and frequency in the process of grid disturbance.Therefore,an improved VSG adaptive active power control method is proposed.The control strategy is to accelerate the tracking of the active power command value of VSG and reduce the unbalanced overshooting of active power in the transient process by compensating the deviation of frequency and then superimposed the compensation on the original active power output.At the same time,the dynamic process of VSG is controlled by adaptive coordination,and the sag coefficient,inertia coefficient and damping coefficient are adjusted according to the changes of VSG angular velocity in real time.Finally,the effectiveness and superiority of the proposed control strategy are verified by Matlab/Simulink simulation.

关 键 词：虚拟同步发电机 有功-频率控制 频率补偿 自适应调节 并网 

分 类 号：TM341[电气工程—电机]