一种低压APF和TSC并联最优运行的方法

An optimal operation method for the parallel of low voltage APF and TSC

针对低压电网中传统有源电力滤波器(APF)和晶闸管投切电容器(TSC)简单并联运行时出现的系统不稳、TSC频繁投切等问题,提出了一种基于FBD法的统一APF和TSC且共用电抗器的控制方法。该方法只通过一个控制器同时计算出APF的补偿指令电流和TSC投切组数控制信号。通过负载电流的变化率dILq/dt判断负载是否处于暂态过程,来决定是否更新TSC的投切状态,从而避免TSC的频繁投切和系统振荡。共用电抗器的拓扑结构还能节约经济成本,减小装置体积。通过仿真实验,验证了系统的可行性及有效性,是一种高性价比且性能优良的无功及谐波补偿方法。

According to the issues such as system instability and thyristor switching capacitor （TSC） frequent switching occurs when traditional parallel operation of low-voltage active power filter （APF） and TSC. A control method witch based on FBD method with unified APF and TSC and shared reactor was presented .This method only use one controller to calculate the APF compensation command current and the TSC switching signal. Use the load current rate （dlLq/dt） to judge whether the load in transient process, to decide whether to switch capacitors or not, so as to avoid the system instability and TSC frequent switching. The shared reactor topology structure can also save the economic costs, reduce unit volume. Simulation and test results verify the feasibility and effectiveness of the system, it＇s a cost-effective with excellent performance of the reactive and harmonic compensation method.