摘要
为了保证电流型PWM整流器直流侧电流的连续性,需要在驱动信号中加入叠流时间,但叠流时间会给网侧电流带来额外谐波。通过对电流型PWM整流器换流过程进行分析,得到加入叠流时间前后的交流侧电流波形,根据冲量等效原理及对相关波形傅里叶分析,推导出叠流谐波与叠流时间的量化关系。提出一种通过正负斜率锯齿波交替作为载波的调制方法来抑制叠流谐波,通过仿真和实验验证了理论分析的正确性和抑制方法的有效性。
To avoid large overvoltage when the current of the dc-link inductor is interrupted, overlap time is added to the drive signals in current source converters, which will bring the extra harmonics in grid current. Waveforms of AC side current before and after the added overlap time are achieved from the analysis of the current commutation process. The expression of overlap current is given. Moreover, according to the pulse equivalent principle, the quantitative relationship between the extra harmonic of AC side current and overlap time is also illustrated on the basis of Fourier analysis. In addition, a method of restraining the overlap current is proposed. Finally, simulation and experimental results demonstrate the effectiveness of the proposed analysis and restraining method.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第12期142-152,共11页
Transactions of China Electrotechnical Society
关键词
电流型PWM整流器
叠流时间
网侧电流
叠流谐波抑制方法
Current source PWM rectifier
overlap time
grid current
overlap current harmonics restraining method
