基于SVPWM的光伏无功控制研究

针对光伏并网发电过程中无功功率的补偿问题,以光伏并网逆变器主电路结构为基础,提出了一种基于空间电压矢量脉冲调制法的能同时实现并网发电和无功补偿的控制方法。分析了无功补偿控制原理与双向PWM逆变器的空间矢量算法,充分发挥空间电压矢量脉冲调制法电压利用率高、动态响应快的优点,使光伏并网发电系统既可与电网之间进行能量的双向流动,又能提供电网所需的无功功率,最后通过实验验证所述控制策略的有效性。

Research on Photovoltaic Reactive Power Control Based on SVPWM

For the problem of reactive power compensation in the process of PV grid-connected systems, the PV grid-connected inverter main circuit is considered, a new control method is proposed, in which PV grid-connected generation is combined with reactive power compensation based on space voltage vector pulse modulation. The theory of reactive power compensation and the algorithm of space voltage vector pulse modulation are analyzed, which make full use of space voltage vector pulse modulation method which provides high voltage utilization and quick dynamic response, and it also allows two way flow of energy between the PV grid-connected system and the grid, it provides the required reactive power grid as well. Simulation results verify the feasibility of the control method.