摘要
LCL滤波器在谐振频率处存在的谐振尖峰,将使系统振荡,影响电能质量,因此需要进行有效的阻尼。针对该问题,在三相LCL型光伏并网逆变系统中采用电容串联型无源阻尼电流双环控制策略来修善LCL滤波器的幅频曲线,以抑制谐振特性,提高系统性能。同时,深入分析内环采用不同的参数作为反馈变量对系统的影响。最后在MATLAB/Simulink软件中进行仿真,经理论分析和仿真验证,该控制策略可以有效地抑制谐振尖峰、提高系统性能和减小并网电流的谐波含量。
The resonance peak of LCL filter at the resonance frequency may make the system oscillate and affect the power quality,so the effective damping is needed.To solve this problem,the capacitor series passive damping current double loop control strategy was adopted in the three-phase LCL PV grid-connected inverter system to improve the amplitude frequency curve of LCL filter,suppress resonance characteristic and improve system performances.At the same time,the influence of different parameters as inner loop feedback variables on the system was analyzed in detail.Finally,the simulation was carried out in the MATLAB/Simulink software.After theoretical analysis and simulation verification,the control strategy can effectively suppress the resonance peak,improve the system performance and reduce the harmonic content of the grid current.
作者
张计科
王美臣
ZHANG Ji-ke;WANG Mei chen(Institute of Electrical Power,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010080,China;Inner Mongolia Key Laboratory of Mcchanical&Elctrical Control,Hohhot Inner Mongolia 010080,China)
出处
《电源技术》
CAS
北大核心
2020年第9期1334-1337,共4页
Chinese Journal of Power Sources
