摘要
为了确定六相同步风力发电系统最优的调制策略,对参考电压为正弦波情况下3种连续脉宽调制(PWM)策略的性能进行了分析。对正弦脉宽调制(SPWM)、双三相空间矢量脉宽调制(D3SVPWM)、最大四矢量六相空间矢量脉宽调制(6SVPWM)3种连续调制策略的开关电压矢量分布与作用时间进行分析,得到了单基波周期开关次数与最大调制比的性能对比结果;通过数值推导与图论相结合的方式,对3种调制策略的电流脉动特性进行了对比分析。分析结果显示,相同采样频率下,SPWM与D3SVPWM的开关频率约为6SVPWM的1/2倍;D3SVPWM与6SVPWM的直流电压利用率是SPWM的1.155倍;在2个平面等效电感比值kz1z2≤10的条件下D3SVPWM电流脉动最小。综合几种性能分析结果可知,采用D3SVPWM的调制性能最优,仿真和实验结果也证实了分析结果的正确性。
To determine the best modulation strategy in six-phase synchronous generator wind power system, the performances of three continuous modulation strategies are analyzed and compared. After analyzing switching voltage vectors distribution and the dwelling time determination for three continuous modulation strategy, namely, sine pulse width modulation（SPWM）, dual three-phase space vector pulse width modulation（D3SVPWM）, and maximum four vectors six-phase vector pulse width modulation（6SVPWM）, the comparison results of switching times in one fundamental period and maximum modulation index are obtained. By analytical deducing and graph theory, the current ripple characteristics of three continuous modulation strategies are analyzed and compared. The comparison results show that the switching frequencies of SPWM and D3 SVPWM are half of that of 6SVPWM when the sampling frequencies are equal; the DC voltage utilization rates of D3 SVPWM and 6SVPWM are 1.155 times that of SPWM. When the equivalent inductance ratio of two sub-planes is no larger than 10, the current ripple of D3 SVPWM is smaller than the other two modulation strategies. Overall, the performance of D3 SVPWM is the best of all three continuous modulation strategies, which is verified by both simulation and experimental results.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第11期3597-3605,共9页
High Voltage Engineering
基金
国家高技术研究发展计划(863计划)(2011AA050204)~~
关键词
六相同步风力发电机
矢量控制
脉宽调制策略
电流脉动
数值分析
磁链脉动
调制性能
six-phase synchronous wind generator
vector control
pulse width modulation
current ripple
numerical analysis
flux ripple
modulation performance
