摘要
为抑制光伏逆变器集群并入电网引起的谐振,提出一种基于有源谐波电导法的光伏逆变器集群谐振抑制策略。首先,基于PI控制器下电容电流内环,电网电流外环的双闭环控制,分析双闭环控制下单台逆变器谐振抑制效果。其次,在保持控制系统不变的情况下,针对多台逆变器谐振问题,在光伏并网系统中加入有源滤波电导,不仅有效抑制逆变器低频谐波电流汇入网侧系统,还提高逆变器抗扰动能力,从而抑制逆变器集群引起的谐振问题。最后,通过Matlab/Simulink软件仿真验证了光伏逆变器集群谐振能被有效抑制,仿真结果表明谐波电导法对多逆变器谐振有抑制效果。
In view of an suppression of the resonance brought about by the integration of photovoltaic inverter clusters into the grid,a photovoltaic inverter cluster resonance suppression strategy has thus been proposed based on the active harmonic conductance method.Firstly,based on the double closed-loop control of inner capacitor current loop and outer grid current loop under PI controller,an analysis has been made of the resonance suppression effect of single inverter under double closed-loop control.Secondly,with the control system unchanged,active filter conductance is added to the photovoltaic grid connected system for a solution of the resonance problem of multiple inverters,which can not only effectively suppress the low-frequency harmonic current of inverter into the grid side system,but also improve the anti disturbance ability of inverter,thus suppressing the resonance problem caused by the inverter cluster.Finally,the simulation results of MATLAB/Simulink show that the cluster resonance of PV inverter can be effectively suppressed,and that the harmonic conductance method can effectively suppress the multiple inverter resonance.
作者
谷昕鹏
吴强
李圣清
李小宝
何元铭
沈志超
GU Xinpeng;WU Qiang;LI Shengqing;LI Xiaobao;HE Yuanming;SHEN Zhichao(College of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China;Zhouzhou CRRC Times Electric Co.,Ltd.,Zhuzhou Hunan 412000,China;Hunan Photovoltaic Smart Grid Control Engineering Research Center,Zhuzhou Hunan 412007,China)
出处
《湖南工业大学学报》
2021年第3期42-48,共7页
Journal of Hunan University of Technology
基金
国家自然科学基金资助项目(51977072)
国家重点研发计划基金资助项目(2018YFB0606005)
湖南省自然科学基金资助项目(2017JJ4024)。
关键词
光伏逆变器集群
双闭环控制
有源滤波电导
低频谐波
PV inverter cluster
double closed loop control
active filter conductance
low frequency harmonic
