摘要
当三相电压不对称时,i_p-i_q检测方法不能准确地检测出基波无功电流。该文提出了一种新的电流检测方法,通过快速合成的基波正序电压作为锁相环的基准参考电压,并在低通滤波器后加入PI调节器,提高了谐波电流的检测精度。经仿真验证,该方法在三相电压不对称时能够准确检测出基波无功电流和谐波电流。
When three-phase voltage is asymmetric, the fundamental reactive current can＆#39; t be ac-curately detected with ip-iq detection method. In this paper, a new type of current detection method is proposed, for which the rapid combined fundamental positive sequence voltage is as the reference voltage of the phase-locked loop and the PI regulator is added after the low-pass filter to improve the detection accuracy of the harmonic current . The simulated results show that this method can accurately detect the fundamental reactive current and harmonic current in case of asymmetric three-phase voltage.
出处
《工业仪表与自动化装置》
2017年第5期94-96,共3页
Industrial Instrumentation & Automation
关键词
正序电压合成
PI调节器
无功电流
谐波电流
positive sequence voltage synthesis
PI regulator
reactive current
harmonic current
