Research On Nonlinear Control Method Of Active Power Filter Based On Online Identification

In recent years,with the rapid development of power electronic technology,at the same time,the related power electronic equipment in industry and people's daily life has been widely used.It not only to the people brought benefits and convenience,but also bring to the power grid harmonic pollution problem can not be belittled.Power Filter Active(APF)is a kind of power equipment which plays a very important role in harmonic compensation,but its related control method is the core problem of our research.Therefore,the application of APF at home and abroad is not very popular,there are still a lot of problems need to be studied and solved by the current scholars.Therefore,this paper has carried out some simple research on the control method of APF,including the main contents of the study:of a harmonic current detection method can suppress the influence of voltage distortion,using this method is without coordinate transformation,so the algorithm is simple and when running load changes in the dynamic response performance very good.In order to improve the method of UPF,the phase locked loop is added in the detection of harmonic current,which can greatly reduce the impact of voltage distortion of the system.analysis the relationship between active power filter of the electrical parameters,and put forward based on model reference adaptive system(MRAS)APF electrical parameter online identification method,this method don't need extra input signals,only using APF's voltage,current and bias parameters identification,so the normal operation of the power source filter do not cause too much impact.studied with reference instruction is voltage space vector pulse width modulation(SVPWM)to the reference value is the current value of the SAPF tracking control,and create the corresponding Lyapunov function,and carries on the analysis to the stability of the control.based on MATLAB / Simulink to build a simulation model for simulation of the proposed parameter identification algorithm,simulation experiments fully proved the online parameter identification algorithm can fast accurately identify electrical parameters of APF.The identification algorithm can solve the problem of APF parameter measurement uncertainty and parameter variation during operation,which provides the necessary condition for the further improvement of the performance of APF control system,and has important practical significance.