Abstract：As the DC injection problem of PV grid-connected inverters causes severe harm to inverters themselves, the grid and the load. To this end, this paper proposes a strategy for restraining DC injection of PV grid-connected inverters based on improved repetitive control by utilizing repetitive control’s characteristic of helping increase compensation accuracy, and compensation methods can be selected according to different protection needs. The traditional repetitive control has the problem of poor dynamic response. Besides, the DC component in the output of PV grid-connected inverters is not a constant. Therefore, this strategy employs carrier cycle as compensation cycle of repetitive control and calculates DC component in the output. The calculated results are employed as feedback to adjust SPWM duty cycle with PI control to achieve the restraint of DC injection of PV grid-connected inverters, which greatly enhances compensation accuracy and dynamic response of DC component. The feasibility and effectiveness of this strategy are verified through experimental results by employing half-wave load, and the control core in the experiment is TMS320F28XXX.
陈堃, 刘涤尘, 陈昌旺. 基于改进重复控制的光伏并网逆变器直流注入抑制策略[J]. 电工技术学报, 2013, 28(10): 159-166.
Chen Kun, Liu Dichen, Chen Changwang. A Strategy for Restraining DC Injection of Photovoltaic Grid-Connected Inverters Based on Improved Repetitive Control. Transactions of China Electrotechnical Society, 2013, 28(10): 159-166.
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