摘要
在采用有源电力滤波器(APF)消除谐波的过程中,谐波及无功电流的正确检测是决定其补偿效果的重要环节.传统的检测法是基于瞬时无功功率理论,利用坐标变换及其反变换得到谐波及无功电流的,致使APF的控制电路复杂.鉴于此,在电网电压为正弦波的前提下,本文提出一种新的谐波及无功电流检测方法,该方法利用瞬时无功功率理论直接计算出基波正序电流分量,不需要经过坐标变换,因此其控制电路简捷、使用方便;且该检测方法不使用低通滤波器,故增强了补偿的实时性.理论推导和仿真结果证明了该检测方法的有效性.
The compensation performance of active power filter(APF) strictly depends on the accurate detection of harmonic and reactive currents in the course of harmonic elimination by using APF.Due to the application of referenceframe transformation and inverse transformation to detect the harmonic and reactive currents,traditional detection method based on instantaneous reactive power theory gives more complexity in realizing the control circuit of the APF.Imaging the voltage of electrified wire netting is sine wave,a new method to detect the harmonic and reactive currents was proposed in this paper.Since the harmonic and reactive currents were determined in the a-b-c reference frame based on instantaneous reactive power theory,there was no reference-frame transformation requirement.Therefore the control circuit implemented by the proposed algorithm has been carefully simplified and facilitating the practicality of the method.Furthermore,this detection method has improved the real-time performance of compensation,because there was no phase lag caused by the low-pass-filter.The theoretical analysis and simulation verify the validity of this detection method.
出处
《河北工业大学学报》
CAS
北大核心
2012年第4期5-8,共4页
Journal of Hebei University of Technology
基金
国家自然科学基金(60974063)
河北省教育厅科技项目(2009141)
河北师范大学博士基金(L2008B04)
关键词
并联型有源电力滤波器
谐波
无功电流
检测
瞬时无功功率理论
shunt active power filter
harmonic
reactive current
detection
instantaneous reactive power theory
