基于光伏并网的电能质量控制系统

A Power Quality Control System Based on Grid-Connected Photovoltaic Power Generation

结合微网光伏并网系统和电能质量调节器的特点,提出了一种既能够并网发电,又能实现无功补偿和滤除电网谐波电流的光伏并网及电能质量控制系统(micro photovoltaicgrid and power quality control system,MPG-PQC)结构。首先介绍了该系统的结构和原理,构建了该系统的数学模型;然后提出了适用于该系统的无差拍复合控制策略,重点分析了该控制策略下调制脉宽的理论计算,给出了复合指令的求取方法;最后,搭建了仿真模型和实验平台,给出了该系统的具体实现方案。运行数据表明了系统结构和控制策略的有效性和合理性。

Considering the features of microgrid with grid-connected photovoltaic （PV） generation, a PV grid-connecting and power quality control system that not only can implement grid-connection of PV generation but also can implement reactive power compensation and filter harmonic currents is proposed. Firstly, the architecture and principle of the proposed system are presented and its mathematical model is built; then a dead-bead compound control strategy suitable to the proposed system is put forward, and theoretical calculation of pulse width modulation under the proposed control strategy is emphatically analyzed and the method to acquire compound instruction is given; finally, the simulation model and experimental platform for the proposed system are constructed and a concrete scheme to implement the proposed system is given. Operational data shows that the architecture and control strategy for the proposed system are effective and reasonable.