并联混合型有源电力滤波器的建模

为准确分析有源滤波器的运行特点,根据系统控制策略的需要,在考虑了有源滤波器输出的基础上采用开关函数法建立了并联混合型有源电力滤波器的数学模型,这样可推导出装置在系统中电压与电流的关系用于控制信号的产生。实践表明通过采用这种方法建立的模型对有源滤波器的滤波效果比较明显。

Modeling of Parallel Hybrid Active Power Filter

In recent years,the use of modem electronic equipment is increasing rapidly.The utility AC mains suffer increased harmonic pollution due to the increased number of nonlinear loads and distributed power sources connected to the grid,such as diode rectifiers,thyristor converters,power inverters and electronic appliances.These nonlinear loads/sources generate harmonic and reactive current,which leads to low power factor,low energy efficiency,low power capacity,and harmful disturbance to other appliances.As the traditional harmonic canceling tool,Passive Power Filter(PF)is replaced by some new equipments for its several insuperable disadvantages,such as the more possibility of resonancing with power and the simplex filtering perfonmance.Hybrid Active Power Filter(HAPF),combined the merits of Active Power Filter(APF)and PF,is becoming the researching focus of harmonic eliminating and reactive power compensating equipments.Based on the needs of system control strategy,and with the output filter of active power filter considered,switch function method was adopted to build the mathematical model of parallel hybrid active power filter,thus the relationship between the voltage of the device in the system and current can be inferred and hence used to produce control signals.Practice indicated that the model made by this method is of vital importance in the filtering performance of active power filter.The nonlinear loads/sources generate harmonic and reactive current,leading to low power factor,low energy efficiency,low power capacity and harmful disturbance to other appliances.Hybrid Active Power Filter(HAPF),combined the merits of Active Power Filter(APF)and PF,is used in harmonic eliminating and reactive power compensating equipment.Based on the needs of system control strategy,and with the output filter of active power filter considered,a switch function method was adopted to build the mathematical model of parallel hybrid active power filter,thus the relationship between the voltage of the device in the system and current can be inferred and used to produce control signals.Practice indicated that the model made by this method is of vital importance in the filtering performance of active power filter.