CAJ | 학술논문

针对并网逆变器 LCL 滤波器直接电流控制出现的稳定性和控制精度等问题，提出了一种电流加权控制的策略。控制方案采用逆变器侧和电网侧电流加权反馈方式，调节电流反馈系数可以改善系统性能，还分析了电网电感对控制策略的影响。为了验证理论的正确性和控制策略的有效性，在 Matlab/Simulink 中搭建额定功率5kW 的 LCL 加权电流控制仿真系统。仿真结果表明，电流加权控制稳定裕度大稳态精度高，馈入电网电流总体谐波畸变率小，功率因数高；另外，电网阻抗增大时不影响系统的稳定性，入网电流谐波却进一步下降，功率因数也略有下降。
침대병망역변기 LCL 려파기직접전류공제출현적은정성화공제정도등문제，제출료일충전류가권공제적책략。공제방안채용역변기측화전망측전류가권반궤방식，조절전류반궤계수가이개선계통성능，환분석료전망전감대공제책략적영향。위료험증이론적정학성화공제책략적유효성，재 Matlab/Simulink 중탑건액정공솔5kW 적 LCL 가권전류공제방진계통。방진결과표명，전류가권공제은정유도대은태정도고，궤입전망전류총체해파기변솔소，공솔인수고；령외，전망조항증대시불영향계통적은정성，입망전류해파각진일보하강，공솔인수야략유하강。
Aiming at the problem of stability and control accuracy in direct current control for grid -connected inverter LCL filter, a weighted current control strategy has been presented in this paper .The control scheme adopted an invert-er side current and grid side current as feedback signal to improve the system performance by adjusting the feedback parameters.The influence on control strategy by grid inductance has been analyzed .A rated power with 5kW LCL weighted current control simulation system has been built by Matlab /Simulink to verify the correctness of the theory and the control strategy.The simulation results show that, the current weighted control will have high stability margin and steady state accuracy, grid current total harmonic distortion rate will be very low ,and the power factor will be ver -y high.In addition, the increasing grid impedance will not affect the stability of the system ,but the current harmonic will be further reduced, and the power factor will be lower.