【摘要】 光伏并网逆变器输出电压中的直流分量会给逆变器、电网以及负载带来危害,为此,提出了一种基于重复控制思想的光伏并网逆变器输出电压直流分量的瞬时补偿策略。分析了光伏并网逆变器输出电压直流分量的产生原因。引入重复控制思想,以载波周期为单位检测光伏并网逆变器输出电压直流分量,并将每个载波周期检测得到的输出电压直流分量结果之和作为反馈与输出电压PI控制环一起调整正弦脉冲宽度调制(sinusoidal pulse width modulation,SPWM)占空比,实现对光伏并网逆变器输出电压直流分量的补偿。实验结果验证了该策略的可行性。更多还原

【Abstract】 The DC component existing in the output voltage of PV grid-connected inverters causes harm to inverters, the grid and the load. Therefore, this paper proposes an instantaneous compensation strategy of the DC component in the output voltage of PV grid-connected inverters based on repetitive control. The cause of the DC component is analyzed and then repetitive control is introduced. This strategy detects the DC component by every carrier cycle, and the sum of the detected results is employed as feedback to adjust SPWM duty cycle with the output voltage PI control loop in order to achieve compensation of the DC component in the output voltage of PV grid-connected inverters. The feasibility of this strategy is verified through experimental results.更多还原