摘要
为了有效地检测供电系统中任意次正、负、零序谐波电流,提出了一种基于FBD的电流实时检测方法。首先利用倍频器和锁相环来产生任意次正序参考电压,并以此构造出相应的负序和零序参考电压;再利用参考电压和三相电流求得对应的等效电导;最后利用等效电导求得相应次谐波电流正、负、零序分量。克服了传统FBD电流检测法只能检测任意次谐波正序电流分量的局限性,拓展了FBD法的应用范围;与基于瞬时无功功率理论的电流检测方法相比,无Park变换和dq变换,减化了计算过程,可以有效地进行电流实时检测。仿真结果表明其正确性和有效性。
In order to effectively detect positive sequence,negative sequence and zero sequence harmonic current in three-phase and four-wire power system,a new detection method based on Fryze-Bachholz-Dpenbrock（FBD） is proposed.The keypoint of this method is to generate positive reference voltages by PLL with tracking three-phase voltage.With the reference voltages and currents,the equivalent conductance can be acquired,and then the conductance is used to calculate the random positive,negative and zero sequence currents.This algorithm ensures the detected current waveform is consistent with the actual current waveform,which extends the FBD-method into a wider application field.Simulation results prove that the method is feasibility and validity.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2014年第5期27-32,共6页
Proceedings of the CSU-EPSA
关键词
电流检测
三相四线制
正序电流
负序电流
零序电流
等效电导
current detecting
three-phase four-wire system
positive sequence current
negative sequence current
zero sequence current
equivalent conductance
