统一电能质量调节器的谐波检测与补偿策略研究

统一电能质量调节器(UPQC)将串联有源滤波器和并联有源滤波器结合起来,能够同时从整体上补偿系统电流和电压,具备综合的电能质量调节功能。采用dq0谐波检测法作为UPQC的检测方法,并采用空间电压矢量SVPWM作为UPQC串联侧补偿方法,在并联侧引入自抗扰控制器ADRC,将负载电流和电网电压等系统内外部模型不确定性统一视为控制器的未知干扰,通过扩张状态观测器来估计,利用非线性反馈控制律进行补偿。此法不需要精确地测量谐波,并且能很好地适应对于不同的负荷。最后在MATLAB的Simulink软件平台上进行仿真实验,结果表明了本文所采用的检测和补偿方法的正确性和有效性。

The Research of Harmonic Detection and Control Strategy for Unified Power Quality Conditioner

The unified power quality conditioner(UPQC) combines the advantages of both the series active filter and the parallel active filter,it can compensate current and voltage as a whole at the same time,and it has a comprehensive adjustment function of power quality.In this paper,the dq0 harmonic detection method is used as an integrate detection method of UPFC voltage and UPFC current,the SVPWM control strategy is used as a control methods in the series side UPQC,the active disturbance rejection controller(ADRC) is used in the parallel side that the load current and the source voltage are all contributed to total disturbances,and the expending state observer is used to estimate.Then the disturbance can be compensated by the nonlinear state error feedback control law.So the complicated current reference calculation is avoided,which makes the system adaptive to the different load.The detection method and the compensation strategy of voltage and current are simulated on Matlab software platform.The simulation results verify the correctness and the effectiveness of the detection method and the control strategy in the paper.