光伏并网逆变器的控制策略研究

On Control Strategy of Photovoltaic Grid-connected Inverter based on Space Vector Transformation

阐述了一种基于空间矢量变换的三相并网逆变器的控制策略。建立了在两相同步旋转坐标系dq下的逆变器的数学模型,提出了基于空间矢量变换的电压电流双闭环控制策略,实现了并网电流的有功分量与无功分量的独立控制,并给出电流环的解耦控制与电网电压的前馈控制。提出了一种新的空间矢量算法。仿真结果显示,采用该控制策略可以很好地改善并网电流质量,并可实现高功率因数并网。

This paper presents a control strategy of three-phase grid inverter based on space vector modula- tion. The model of the inverter was built in the two-phase rotating reference frame, the control principle was proposed based on the space vector SPWM current control, which realize the grid current active com- ponent and reactive component of the independent control, and presents a decoupled current control and feed-forward of power grid voltage control. The simulation results verify that the proposed control strategy can not only improve the quality of grid current, but also connect the grid with unity power factor.