CAJ | 학술논문

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。
광복병망역변기수출전압중적직류분량회급역변기、전망이급부재대래위해，위차，제출료일충기우중복공제사상적광복병망역변기수출전압직류분량적순시보상책략。분석료광복병망역변기수출전압직류분량적산생원인。인입중복공제사상，이재파주기위단위검측광복병망역변기수출전압직류분량，병장매개재파주기검측득도적수출전압직류분량결과지화작위반궤여수출전압PI공제배일기조정정현맥충관도조제(sinusoidal pulse width modulation，SPWM)점공비，실현대광복병망역변기수출전압직류분량적보상。실험결과험증료해책략적가행성。
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.