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中文摘要：
直流注入是光伏并网发电系统中的一个重要问题。IEEEStd.929-2000规定直流注入必须小于系统额定电流的0.5%。然而,目前关于直流注入问题的相关研究较少。借鉴电容隔离直流的特性,从控制理论角度出发,提出一种基于虚拟电容的并网逆变器直流注入控制策略,通过并网电流前馈至占空比实现虚拟电容,有效地消除了并网电流中可能存在的直流分量。分析此方案的工作原理,设计电流控制和锁相算法,并采用Matlab/Simulink进行仿真研究。在500W实验样机上进行方案可行性分析,实验结果验证了此方案的有效性。
英文摘要：
DC injection restriction is a critical issue in the photovoltaic power systems. IEEE Std.929-200 specifies that the grid-connected inverter system shall not inject the dc current greater than 0.5% of the full rated output current. However, few literatures discuss this problem. Considering the inherent dc-block characteristic of the capacitor, a DC injection control scheme was proposed based on virtual capacitor with the grid current fed forward to duty ratio from the view point of control theory, which can effectively mitigate the DC component. The operation principle of the proposed solution wais analyzed and the current controller and phase locked algorithm were discussed. Matlab simulations and 500 W prototype experiments were carried out, and the results verify the effectiveness of the proposed scheme.
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