摘要
针对多台虚拟同步发电机(VSG)并联运行的微电网系统易受负荷波动影响而产生的频率越限问题,提出一种基于VSG的频率二次控制策略。首先,分析VSG的控制原理,并指出一次调频的不足;其次,通过将频率偏差引入PI控制器中,实现微电网在不需要通讯的条件下的二次频率控制。同时实现了各并联VSG调频功率的均匀分配,并利用小信号模型分析PI参数对系统稳定性的影响。最后,利用MATLAB/Simulink搭建仿真模型,验证了所提二次调频控制的有效性。
A frequency reversal control based on VSG is proposed for the problem that the micro-grid system with multiple VSGs operating in parallel is susceptible to load fluctuations.Firstly,the control principle of VSG is analyzed,and the shortage of frequency modulation is pointed out.Sec-ondly,the secondary frequency control of the micro-grid without communication is realized by introducing the frequency deviation into the PI controller to realize the system with no difference in frequency modulation.At the same time,the proposed quadratic frequency modulation can realize the uniform distribution of the parallel VSG frequency modulation power.The small signal model is used to analyze the influence of PI parameters on the stability of the system.Finally,the simulation model is built by MATLAB/Simulink.The simulation verifies the effectiveness of the proposed quadratic frequency modulation control.
作者
李季
楚冰清
余健明
LI Ji;CHU Bing-qing;YU Jian-ming(School of Electronic Information and Electrical Engineering,Shangluo University,Shangluo 726000,Shaanxi Province,China)
出处
《信息技术》
2019年第11期62-66,共5页
Information Technology
基金
商洛学院教育教学改革研究项目(19jyjx104)
陕西省社科界2018重大理论与现实问题研究项目(2018Z87)
关键词
微电网
虚拟同步机
一次调频
二次调频
稳定性
micro-grid
virtual synchronous generator
primacy frequency control
secondary fre-quency modulation
stability
