超导储能装置中的电流源型逆变器

超导储能(SMES)装置中的超导磁体通过AC/DC变流装置与交流电网连接,变流装置主要有电压源型逆变器和电流源型逆变器两种,对于超导储能装置而言,电流源型逆变器与电压源型相比有许多优点。文中主要介绍双桥式和三端口式两种电流源型逆变器,给出了分别采用优化PWM和直接电流PWM开关策略的基本原理和实现方法,并对上述逆变器和PWM开关策略进行了仿真和实验研究。结果表明,采用不同的逆变器结构和PWM开关策略可以达到不同的控制效果,以满足不同的系统要求。

Current Source Inverter(CSI)in SMES

Superconducting Magnet Energy Storage(SMES) is a promising application of superconducting tech-nology in power system.The superconducting magnet of the SMES system is connected with the grid through AC/DC.Two types of inverter are mostly used in SMES:the Voltage Source Inverter (VSI) and the Current Source Inverter (CSI).In application to SMES,CSI has many advantages compared to VSI.This paper introduces the two-bridge CSI and the three-port CSI in different SMES systems.The optimum PWM and the current vector PWM are utilized respectively and their principles and utilization-steps are presented.Simulations and experiments are carried out to investigate the topology of the inverters and the PWM strategies.The results show that with the different types of inverters and PWM strategies the expected controlling effects could be reached in order to meet the demands of the system.