并联型有源电力滤波器电流控制的等效原理

详细分析和论证了基于负载谐波与无功电流检测的并联有源电力滤波器(APF)和基于电源电流直接控制的APF控制方式之间的内在联系,得出二者在电流控制上等效这一重要结论。给出基于上述等效原理的APF新型控制方案,该方案是在传统方案基础上,省掉负载和APF电流检测单元以及谐波及无功电流或基波有功电流运算单元。分析了该方案与传统控制方案之间的关系,结果表明:传统控制方案中的谐波及无功电流检测信号只是APF直流侧电容电压闭环控制前向通道中的一个前馈信号。基于新方案制作了一台单相APF实验样机,实验结果验证了该文结论和所提方案的正确性和有效性。

Equivalence Principle of Current Control for Shunt Active Power Filters

Two main types of schemes are used in shunt Active Power Filters(APF)control:the conventional control scheme which is based on detecting and calculating the harmonic and reactive currents of nonlinear loads,and the direct ac main current control scheme which does not require the harmonic and reactive currents to be sensed and computed.This paper analyzes and demonstrates the inherent relations between the two types of control schemes and concludes that they are equivalent for current control.A new control scheme based on this conclusion is proposed and discussed,and the harmonic and reactive currents signal calculated in a conventional APF is found to behave as just a feed-forward signal in the proposed APF control scheme.An in-depth analysis shows that the proposed control scheme is a low-cost but high-performance solution for power quality control,and that this scheme needs only one ac current sensor to sense the ac main current,and one dc voltage sensor to sense the dc capacitor voltage.A prototype was developed to demonstrate the performance of the proposed APF and the finding are well supported by the experimental results.