Research On Modeling And Decoupling Control Strategy For Shapf Based On Intelligent Generalized Inverse System

Active Power Filter(APF)is a new type of power electronic which is used to suppress harmonics and compensate reactive power.It can compensate for harmonics and reactive power that vary in size and frequency.It can overcome the shortcomings of traditional Passive Power Filter(PPF)to perform compensation dynamically.Shunt Hybrid Active Power Filter(SHAPF)is a topology result of APF.It connected APF and PPF in series,PPF is used to compensate for harmonics with a high specific content.APF played the role of missing traps to compensate for other sub-harmonics to offset harmonics and reactive power.In addition,another major advantage of SHAPF compared with traditional APF is that the introduction of PPF can be applied to larger capacity applications,It will greatly save the cost of the device.So the application of APF has important engineering real value for purifying power grid quality.However,in the three-phase abc stationary coordinate system,the strong coupling between the three-phase currents of the SHAPF and the highly nonlinear relationship make the actual compensation signal and the command signal greatly inaccurate,which seriously affect the accuracy of the SHAPF compensation.In addition,the nonlinear relationship of SHAPF makes the design of the controller very difficult.Regarding to the issue above,SHAPF generalized inverse system model is deduced by analytical method and an intelligent algorithm is used to build the model of SHAPF whose model is unknown.Mathematical model of SHAPF is firstly built,the generalized inverse system decoupling of SHAPF is solved by analytical method,it is compared with other traditional decoupling method that the superiority of its decoupling effect is better understood and designed.The controller is completed determined by the mathematical model.Secondly,the SHAPF model that cannot be accurately modeled for actual operating conditions is introduced.The LS-SVM method is used to identify and the SHAPF generalized inverse system model and is inversely related to the LS-SVM.The system identification modeling is compared with the accuracy of its modeling accuracy,the accurate linearization decoupling model of the SHAPF is completed,and finally IMC(Internal Model Controller)is introduced to control the decoupling subsystem of SHAPF.The subsystem can be controlled from open loop to closed loop,it can improve the performance of the subsystem,and it can add the internal model control filter to make the decoupling subsystem have better robustness.