一种新型多电平静止无功发生器研究

Research on a New Multilevel SVG

提出了一种新型多电平静止无功发生器的拓扑结构,采用共用直流电容的两组逆变器,实现无功、谐波和三相不平衡综合补偿。分析了这种新型多电平静止无功发生器的基本结构和补偿原理,设计了装置的控制系统,完成了硬件系统主电路和控制电路的设计,采用以DSP+FPGA为核心的控制系统。介绍了系统软件部分的设计,包括主程序、定时器中断子程序和FPGA模块三部分。通过仿真和实验证明了文中提出的新型多电平静止无功发生器补偿无功功率效果良好,且直流电容电压稳定。

Multilevel SVG has been researched and used widely because of its lower output harmonics and high power capability.A new topology of multilevel SVG is presented in this paper.The new topology achieves comprehensive compensation of reactive power,harmonics and three phase imbalance using two inverters with common DC capacitor.The structure and compensation principles of the new multilevel SVG are analyzed.And the main circuit and control circuit of hardware are designed using DSP and FPGA as the core of the system hardware.The design of software is introduced,including main program,the timer interrupt subprogram and FPGA module.Lastly,results of simulation and experimental verify that the proposed system has good effect in reactive power compensation and the voltage of DC capacitor is stable.