多个电压源型谐波负载的谐波补偿点研究

Research on Compensation Point of Multiple Voltage Source Harmonic Load

为得到更好的补偿效果,研究了并联型有源电力滤波器(SAPF)在补偿多个电压源型非线性负载时补偿点的选择问题。在SAPF指定次谐波补偿策略的基础上,采用等效电路法,分析了同时补偿多个电压源型非线性负载时发生的谐波放大现象,重点讨论了SAPF安装位置不同对谐波电流的放大现象。通过公式推导,比较了谐波电流的放大倍数,得出SAPF最小谐波放大补偿点的选择依据。然后从系统结构和控制策略上提出了抑制谐波放大的具体措施。搭建的Matlab/Simulink仿真模型与样机实验验证了上述分析的正确性。

In order to obtain a better compensation effect, the selection of the compensation point of the shunt active power filter（SAPF） to compensate multiple voltage source harmonic load is studied.On the basis of the SAPF specified sub harmonic compensation strategy,the harmonic amplification of multiple voltage source nonlinear loads is studied and the amplification of harmonic current in SAPF installation position is mainly discussed by adopting the method of equivalent circuit.Based on the formula,the harmonic current amplification factor is compared,and the choice of the SAPF minimum harmonic amplification compensation point is obtained.Then, the concrete measures are put forward to restrain the harmonic amplification from the system structure and control strategy.The Matlab/Simulink simulation model and the experiment of prototype verify the correctness of the above analysis.