Design Of Three-phase Active Power Filter Controller Based On FPGA And ARM Processor And Research On Harmonic Compensation Control Strategy

With the development of power electronics technology,the national industrial production capacity has been further improved,and the nonlinear load devices represented by rectification and frequency conversion in the power transformation and distribution system are widely used in the power grid,and a large number of load harmonics are increasingly polluting the power grid.Active Power Filter(APF)has become the main engineering application means of harmonic control,and this paper analyzes and studies the relevant control technology for T-type three-level APF.Firstly,this paper analyzes the working mode of T-type three-level APF converter and establishes its mathematical model.At the same time,the principle and performance of the predictive current control method are analyzed and studied,and the IP-IQ method based on instantaneous reactive power theory is used to extract the harmonic current of the load,which can resist the influence of grid voltage distortion compared with the traditional P-Q detection method and provide accurate harmonic compensation instructions for adaptive predictive current control.The APF predictive current control open-loop transfer function is established,and the harmonic compensation performance of the proposed method decreases when the parameters of the APF network side change are verified by simulation.Aiming at the above changes in APF network side parameters,an APF network side parameter identification model is established,and an adaptive predictive current control strategy based on parameter identification is proposed,and the online identification of network side parameters by using the identification strategy with forgetting factor is adopted to ensure that APF still has good harmonic compensation performance when the network side parameters change,and the effectiveness of the strategy is verified by building a simulation platform.Finally,the test prototype was built,and the controller adopted FPGA + ARM software architecture,in which FPGA is responsible for harmonic compensation instruction calculation,PWM wave generation and protection control,and ARM is responsible for high-speed sampling and host computer control communication.The two use dual-port RAM mode for data communication,which solves the problem of high-speed synchronization of FPGA and ARM sampling data.Through experiments,it is verified that the parameter identification module can accurately identify the parameters on the APF network side,and the adaptive prediction current control method can always maintain good harmonic compensation accuracy for the change of APF network side parameters,and the harmonic compensation performance of the prototype can meet the application requirements.