中文摘要：

针对单相并网变换器,通过二阶广义积分构造与电网电压、并网电流正交的虚拟电压、电流分量来形成αβ坐标系下的两相系统。将αβ坐标系下的两相系统变换到按电网电压定向的dq旋转坐标系下。推导两相系统在αβ坐标系和dq旋转坐标系下的数学模型,在此基础上简要分析单相并网变换器的矢量控制原理。根据瞬时功率理论和预测方法推导两相系统在dq旋转坐标系下的功率预测模型,根据此模型提出一种预测直接功率控制策略。搭建1kW的样机,对矢量控制和预测直接功率控制进行研究。实验表明预测控制方案的可行性和正确性,与矢量控制相比,预测直接功率控制具有更快的功率响应。

英文摘要：

For single-phase grid-connected converters, using the actual single-phase input current and voltage, a virtual quartered currents and voltages were constructed using the second-order generalized integrator（SOGI）. Based on these electric parameters, a αβ coordinate system was formed. The electric parameters of the αβ coordinate system were transferred to the dq synchronous system. This paper deduced the mathematical models of the αβ coordinate and dq synchronous respectively. Based on these mathematical models, the vector control principle of single-phase voltage source grid-connected converters was analyzed. Then the instantaneous power model of dq rotating coordinate frame was derivate and analyzed based on the Instantaneous Reactive Power Theory and the Prediction method. A predictive direct power control strategy based on this instantaneous power model was presented. A 1kW prototype of a single-phase voltage source grid-connected converter was set up. Comparative experiments were tested for vector control（VC） and predictive direct power control（P-DPC）. Experimental results show that the feasibility and correctness of P-DPC are validated, and its power response is faster than VC.