基于IGBT串联的电压源换流器的电动力计算及振动分析  

Electric Power Calculation and Vibration Analysis of Voltage Source Inverter Based on IGBT in Series

作　　者：王勋[1] 李琳[1] 高学敏[2] 余志飞[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]中国电力科学研究院电力电子研究所,北京100192

出　　处：《电力科学与工程》2014年第3期29-34,共6页Electric Power Science and Engineering

基　　金：国家电网公司科技项目(DL71-12-007)

摘　　要：为解决基于IGBT串联的电压源换流器的优化设计问题,防止其在实际运行中由于受到超过设计结构所能承受的电动力而出现机械性损坏,对现有设计容量下换流器各个阀段的受力进行了计算。另外,对半桥及阀段间距进行调整后分别计算了受力,得出了现有设计结构下阀段受力校验值最小的阀段间距。考虑到机械振动,对单个阀段的固有频率进行了计算,然后通过对流过阀段的电流波形进行傅里叶变换并分析了其频率成分。计算得到单个阀段的一阶固有频率为5 014 Hz,而变换得到的幅度频谱的主要频率成分分布在3 300 Hz以下,由此可见,该电流产生的电动力不会引起阀段的共振。To optimize the design of the voltage source inverter which is based on IGBT in series,as well as pre-vent mechanical damage due to the electromotive power exceeding the designing threshold,the force of each valve section was calculated under the existing design capacity. Further,the distance between valve sections was modi-fied and the force in each case was calculated for the purpose of obtaining the optimum distance in which the elec-tromotive force has the minimum value. Considering mechanical vibration and possible resonance,the natural fre-quency of a single valve section was calculated,and frequency components of the valve section current waveform were analyzed through Fourier transform. The natural frequency of a single valve section is 5 014 Hz,whereas the major frequency of the spectrum distributed in below 3 300 Hz. It reveals that the electromotive power caused by the current will not cause resonance of the valve section.

关 键 词：电动力计算 固有频率 谐波分析 

分 类 号：TM721.1[电气工程—电力系统及自动化]