中文摘要：

传统直接功率控制（DPC）具有结构简单、动态响应速度快的特点,但开关频率不固定,不利于输出滤波器的设计,同时需要较高的采样频率。针对以上缺点,根据三相光伏并网逆变器动态数学模型,结合虚拟磁链和预测DPC的优点,提出了一种基于虚拟磁链的预测DPC策略。该控制策略无需检测电网电压、无需同步旋转坐标变换,并且开关频率固定,可减少跟踪误差及参数不准确造成的干扰。仿真与实验均证明了该方法的正确性与可行性。

英文摘要：

Traditional direct power control （DPC） has the advantages of simple structure and fast dynamic response, but it is disadvantageous to the design of the output filter due to the unfixed switching frequency and it requires a high sampling frequency.For the shortcomings above ,this article proposes a virtual line-flux-linkage oriented predic- tive DPC strategy by combining the advantage of DPC control with virtual flux based on the dynamic mathematical model of three-phase PV grid-connected inverter.The control strategy reduces the interference caused by the track- ing error and the inaccurate parameters thanks to the fixed switching frequency without detection of grid voltage and synchronous rotation coordinate transformation.Simulation and experimental prove the correctness and feasibility of the method.