【摘要】 提出一种具有功率因数校正、补偿负载不平衡和滤除电网谐波电流的静止无功补偿器(static var compensator,SVC)和有源电力滤波器(active power filter,APF)联合运行系统电路结构。其中,SVC由晶闸管控制电抗器(thyristor controlled reactor,TCR)及固定电容器(fastness capacitor,FC)组成,主要用来快速补偿无功,并通过对其三相不对称控制来消除电网三相不对称和负序电流;APF部分主要用来消除电网及SVC引起的谐波电流,同时抑制固定电容器与电网等效阻抗间可能的串并联谐振。在分析SVC和APF联合运行系统基本工作原理的基础上,对联合运行时的控制方法进行研究。仿真和实验结果证明了该联合运行系统的可行性。更多还原

【Abstract】 A combined reactive power compensation system of a static var compensator (SVC) and an active power filter (APF) is proposed in this paper for unbalanced three-phase distribution feeders with harmonic distortion. The system has the function of power factor correction and harmonic mitigation. In this system, the SVC acts as a classic reactive power compensator for load balancing and power factor correction. The small rating active power filter is used to improve filtering characteristics of the passive power filter in SVC and suppress possible resonance between the system impedance and the passive power filter. Based on the analysis of the operational principle of the system, the control method of the combined system is presented in detail. Simulation and experimental results show that the proposed reactive power compensation configurations can effectively balance currents, correct power factor, and eliminate harmonic currents.更多还原