基于环流控制的模块化多电平变换器功率器件应力分析  

Stress Analysis of Power Semiconductor Devices in Modular Multilevel Converter by Controlling Circulating Current

作　　者：李金科[1] 金新民[1] 荆龙[1] 武文 吴学智[1] 

机构地区：[1]北京交通大学国家能源主动配电网技术研发中心,北京100044 [2]北京电动车辆协同创新中心,北京100044

出　　处：《高电压技术》2016年第10期3156-3165,共10页High Voltage Engineering

基　　金：国家能源应用技术研究及工程示范项目(NY20150302)~~

摘　　要：为保证模块化多电平变流器的安全稳定运行,定量地计算出桥臂环流幅值Id的改变对功率器件的影响,并绘制出电流电压相角差φ=0°及90°两种工况下各电气量变化曲线。结果显示可以找到环流幅值最优点(Id≠0)来有效降低流经开关器件的电流峰值、有效值、平均值及模块电压波动值。为此,利用降阶准谐振调节器设计了环流幅值控制器,MATLAB仿真及实物样机实验结果表明了数值计算的有效性。并通过对百兆瓦级换流站的分析,证明了该数值计算方法在工程实践中的意义。利用环流控制最优点(Id≠0),能有效控制改善功率器件应力,增加器件运行寿命,提高系统安全运行范围,同时也为环流研究和控制提供了另一种思路。To ensure the operating performance of modular multilevel converter, the electrical qualities of power semiconductor devices affected by the amplitude of circulating current Id are analyzed and calculated. And the electrical quantities curves are supplied under two conditions of φ=0° and 90°. The results show that the optimal value of circulating current（Id≠0） can be achieved to reduce the average value, root mean square value of power semiconductor devices currents, and capacitors fluctuations. Therefore, circulating current controller based on reduced order quasi-resonant is designed. Simulation and experiment results indicate the validity and feasibility of numeric calculation for circulating current controlling. The significance in engineering practice is introduced by analyzing hundred megawatts converter station. The device stress can be reduced by controlling the circulating current amplitude effectively. The system security operating range is improved and another thought is provided for researching and controlling the circulating current.

关 键 词：模块化多电平变流器 环流 功率器件 降阶准谐振调节器 应力分析 

分 类 号：TM46[电气工程—电器]