摘要
针对矿井大功率直流拖动系统的谐波抑制问题,采用一种新型PWM变流器的拓扑结构,即直流侧混合型贮能且串联谐振工作方式,构成了无源+有源的新型并联型有源滤波器的结构形式。对无源+有源的新型有源滤波器进行PWM控制策略的研究,推导出基于傅里叶变换的谐波控制策略,用于对三相电力系统的5、7、11、13次谐波进行补偿。用TMS320F240DSP实现提出的控制策略,在实验室搭构试验样机进行实验研究。研究表明,系统的5、7、11、13次谐波得到了很好的抑制,网侧电流的THD从26.4%减小到12.8%,谐波总畸变率有明显降低,从而验证了控制策略及其实现的有效性。
Aimed at attenuating the harmonics caused by high power DC drive system,proposed a new PWM topology of converters, that is,work styles of the hybrid energy storage in DC side and series resonant to form the new type of parallel active filters with reactive and active. Introduced the PWM control strategy of the new active filter with reactive and active and a harmonic control strategy based on the Fourier transform to compensate for harmonic of the 5th ,7th, llth, 13th in three-phase power system. The proposed control strategy was accomplished through TMS320F240 DSP. In the laboratory, experimental prototypes were constructed to carry out experimental study. The present study finds that the harmonic of the 5th,7th, lhh, 13th in the system is subjected to better suppression, so that the THD of net-side currents decreases from 26.4% to 12. 8%, with a significant reduction in total harmonic distortion rate,which verifies the effectiveness of the control strategy and its implementation.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第2期338-342,共5页
Journal of China Coal Society
