基于直流电压注入的多脉动电压源换流器  

Multi-Pulse Voltage Source Converter Based on DC Voltage Injection

作　　者：潘武略[1] 徐政[1] 张静[1] 

机构地区：[1]浙江大学电机系,杭州310027

出　　处：《电工技术学报》2009年第3期139-146,共8页Transactions of China Electrotechnical Society

基　　金：国家电网公司科技基金资助项目(SGKJ[2007]249)

摘　　要：提出了一种基于直流电压注入的新型电压源换流器,该换流器由一个12脉动换流器和一个附加电路构成。附加电路通过变压器向12脉动换流器中点注入直流电压,将12脉动换流器变为60脉动换流器,换流器输出电压、电流的谐波水平很低,不需要滤波器就可以满足系统的谐波要求。换流器主电路采用基频触发,降低了开关损耗,更适合于高电压、大功率的应用场合。分析了该换流器的拓扑结构和工作原理,并使用PSCAD/EMTDC软件对其进行了仿真验证,为将来的实机制造提供了参考。In this paper, a novel voltage source converter is proposed. It is composed of a 12- pulse converter and an auxiliary circuit. The auxiliary circuit injects DC voltage via the mid point of the 12-pulse converter. Proper injection ratio and frequency parameters are selected to convert the standard 12-pulse into 60-pulse configuration without using PWM or increasing the number of bridges, thus the voltage and current can fulfill the THD limit without conventional filter. As the main bridges operate at fundamental frequency, the switching lose is relatively low. This converter may be widely used in the HVDC and FACTS system. The principle and control strategy of the proposed converter are described. Its operational feasibility is also verified by digital simulation using the PSCAD/EMTDC package.

关 键 词：多脉动换流器 电压源换流器 附加电路 电压注入 

分 类 号：TM721[电气工程—电力系统及自动化]