并联型三相三线制有源电力滤波器直流侧电压优化控制策略

摘要

For harmonic and reactive compensation of shunt active power filter (SAPF), the higher the DC link voltage is, the better comthepensation performance will be.However, higher SAPF DC voltage will cause bigger switching loss and switching noise, which is bad for the long-time running of SAPF.Thus, an optimal DC link voltage control strategy is proposed based on the equivalent energy model of three-phase three-wire system of SAPF.According to the reactive powers which is consisted in power grid and conpensated by SAPF, the compensated result would be better when the reactive power is near to zero in power grid side.Moreover the optimal DC link referent voltage is calculated to decrease switching loss and switching noise in the strategy.Simulation and experiment results validate the correctness of the theoretical analysis.%对于谐波和无功补偿来说,并联型有源电力滤波器(shunt active power filter, SAPF)的直流侧电压越高,其补偿效果就越好.然而,较高的SAPF直流侧电压将带来较大的开关损耗和开关噪声,不利于SAPF的长期运行.根据三相三线制SAPF的等效能量模型,提出了一种优化的直流侧电压控制策略.该策略基于实际电网侧的无功功率和SAPF所发出的补偿功率,获得所需补偿的无功功率,当电网侧的无功功率接近为零时,可以获得较好的补偿效果,进一步计算出最优的电压值,并且能够有效地减小开关损耗和开关噪声.模型仿真和物理实验验证了该方法的可靠性和可行性.