基于定时器控制的10 kV配电网有源滤波器控制策略研究

Research on Control Strategy of Active Filter in 10 kV Distribution Network Based on Timer Control

有源滤波器由绝缘栅双极晶体管(Insulate-Gate Bipolar Transistor,IGBT)等电力电子器件构成,能够实时、动态地提供谐波电流和无功电流,提高电网电能质量与传输效率,无须大容量的电容器、电抗器,降低了电网发生共振的风险。基于传统有源滤波器的滞环控制策略,文章提出基于定时器控制的控制策略,具有固定开关频率的优点,且可通过设置定时器时间间隔,控制开关频率,降低开关损耗,提高系统效率。为了验证该控制策略,搭建了仿真模型。结果表明,该方法能够大幅度降低电网电流中的谐波含量,有效治理电网的谐波污染。

Active filter is composed of Insulate-Gate Bipolar Transistor(IGBT)and other power electronic devices,which can provide harmonic current and reactive current in real time and dynamically,and improve the power quality and transmission efficiency of the power grid,without the need for large-capacity capacitors and reactors,and reduce the risk of resonance of the power grid.Based on the hysteresis control strategy of traditional active power filter,this paper puts forward a control strategy based on timer control,which has the advantage of fixed switching frequency,and can control switching frequency by setting timer time interval,reduce switching loss and improve system efficiency.In order to verify the control strategy,a simulation model is built.The results show that this method can greatly reduce the harmonic content in the power grid current and effectively control the harmonic pollution of the power grid.