The Sine Wave Voltage Type Inverter Circuit Modeland Waveform Tracking Technology Research

With the rapid of development modern science and technology,The application of inverter power supply is more and more widely,It is output waveform quality put forward higher requirements.In order to solve the inverter power supply voltage waveform distortion caused by nonlinear load and other factors,In this paper,based on the theory of repetitive control inverter circuit control technology has carried on the thorough research.Good inverter power source not only has high steady-state performance,but also has fast dynamic response.But it's hard to satisfy the two requirements for a single control strategy at the same time.Therefore,we must in-depth analysis various control strategies of advantages and disadvantages,complement each other,mutual penetration,through a compound control improve it performance,and it is one of the hot spot power electronics currently.This article first model method for several common theoretical analysis,And use the discrete time state space method as the inverter circuit model,In-depth analysis of the causes of waveform distortion under nonlinear loads,for the following theoretical analysis and simulation of the whole control system laid a foundation.Secondly in the study of repetitive control theory,we are Proceed from the Angle of the pole and performance and discusses the repetitive control parameters,the optimal relationship between solves the traditional analytic method to ignore internal model of controlled object simplification resulted.And in-depth analysis of the harmonic suppression,stability,convergence and steady-state error,In view of the specific control object completed the control parameter,which using second-order low-pass filter attenuation of high frequency inverter circuit,comb filter to eliminate inverter circuit resonance peak,Using advanced link for phase compensation.Using the MATLAB simulation,the circuit time domain model verifies the correctness of the mathematical model analysis.The experimental results show that the repetitive controller can better realize the waveform tracking characteristics,because of its own limitation,Dynamic performance is difficult to have a greater increase.PI double loop control can quickly response a given signal and repetitive control can stain a certain extent,Through combined control with compound scheme can improve the quality of inverter circuit output waveform,reduce the content of THD,It has good static and dynamic characteristic and important value for engineering application.