谐振式混合型有源滤波器注入支路的仿真分析

Design and Simulation of Injection Branch of Resonance Hybrid Active Filter

谐振式混合型有源滤波器注入之路中等效阻抗之比太大,则APF发出的补偿电流很难注入到电网对谐波和无功功率进行补偿;如果谐振支路和分流支路等效阻抗之比太小,则要求APF的容量比较大,使成本上升。为了解决上述问题,提出了谐振式混合型有源滤波器注入支路的设计分析方法。首先给出补偿装置的整体结构,构建容性无功补偿支路的单相等效电路,建立对应的状态方程,利用状态变量分析法对注入支路中的基波分流支路进行分析设计。构建该补偿装置的单相等效电路图,获得其谐波抑制函数。利用该函数对注入支路中的谐振支路进行分析设计。并将设计好注入支路的谐振式混合型有源滤波器进行滤波效果分析,结果表明,上述偿装置能很好地抑制负载产生的谐波,验证了注入支路设计的正确性。

If the impedance ratio of the injection branch of resonance hybrid active filter is too high, it is difficult for the compensating currents from APF to flow into the grid to compensate harmonic and reactive power. If the im- pedance ratio is too small, the capacity of APF must be high, which increases the cost. A design on the injection branch of resonance hybrid active filter was proposed in order to deal with the problem. The structure of the compen- sating equipment was presented firstly. The single phase equivalent circuit of the capacitive reactive compensating branch was constructed. The state functions were obtained. The fundamental current branch in the injection branch was designed using the state functions. The single phase equivalent circuit was also given to get the harmonic sup- pressing function which was used to design the resonance branch in the injection branch. At last, the whole reso- nance hybrid active filter was simulated to show the performance of suppressing harmonic currents. The simulating re- sults show that the performance of suppressing harmonic currents is good, which verifies the design on the injection branch.