摘要
储能变流器(PCS)是储能系统的重要组成,抑制PCS并联系统谐振尖峰有助于提高PCS并网运行的稳定性。通过分析多台PCS并联系统谐振尖峰的抑制原理,研究并联虚拟电阻抑制897 Hz处的谐振尖峰,提出基于数字低通滤波器的有源阻尼控制策略,通过引入虚拟阻抗增加系统阻尼,使系统输出电流中的谐波含量明显减少,从而抑制PCS并联系统谐振尖峰,提高PCS系统并联稳定性。
Power converter system(PCS)is an important component of the energy storage system,and suppressing the resonant spike of the PCS parallel system helps to improve the stability of the PCS grid-connected operation.This paper analyzes the principle of suppression of resonance spikes in multiple PCS parallel systems,and studies the parallel virtual resistance to suppress the resonance spikes at 897 Hz.At the same time,an active damping control strategy based on a digital low-pass filter is proposed.By introducing virtual impedance to increase the damping of the system,the harmonic content in the output current of the system is significantly reduced,thus the resonance spike of the PCS parallel system is suppressed and the parallel stability of the PCS system is improved.
作者
李朝晖
孙鑫
滕卫军
LI Zhaohui;SUN Xin;TENG Weijun(State Grid Henan Electric Power Research Institute,Zhengzhou 450006,China)
出处
《热力发电》
CAS
CSCD
北大核心
2021年第5期147-152,共6页
Thermal Power Generation
基金
国网河南省电力公司科技项目(52170219000R)。
关键词
PCS失稳机理
谐波抑制
谐振尖峰
并联系统
控制策略
PCS instability mechanism
harmonic suppression
resonance spike
parallel system
control strategy
