一种具备友好网荷交互功能的三相PWM整流器控制方法

在智能电网的构建过程中,越发强调用户与电网互动的重要性。当电网发生频率和电压波动时,传统的变换器控制方法无法较好地进行网荷交互以实现对电网的支撑。本文在三相PWM整流器中运用虚拟同步机技术,结合下垂控制方法,当电网发生频率和电压波动时,能够主动调节三相PWM整流器的有功功率和无功功率,从而在负荷侧实现与电网的友好交互功能。建立了虚拟同步机控制在三相PWM整流器中的应用模型,提出了采用虚拟同步机控制的有功功率和无功功率下垂机制及其控制框图,仿真和实验结果证明了该方法的有效性。

A Control Method for Three-Phase PWM Rectifier with Function of Friendly Interaction Between Grid and Load

The interaction between load and grid has been one of important functions in the smart grid. Conventional converter control methods cannot well realize this interaction to support power grid when the frequency and voltage fluctuations occur. In this paper, the virtual synchronous machine technology is applied to three-phase PWM rectifier to realize the reasonable regulation of active power and reactive power. Combining with droop control, the proposed method can realize friendly interaction with power grid at the load side. The mathematical model of the virtual synchronous machine applied to three-phase PWM rectifiers is established. The mechanism and control block of the droop control with virtual synchronous machine technique are proposed and developed accordingly. Simulation and experimental results verify the effectiveness of the proposed method.