Control Strategy Of Pulse Width Modulation Inverter Based On Repetitive Control

With the development of power electronics technology, the power supply was widely used. As the main part of power supply, the PWM inverter requires high quality of output waveforms, so varieties control methods appear. The main contents of this paper as follows:After completely analyzing the power supply system, the continuous and discrete models were established based on state-space method. Through the analysis of different parameters characteristics of the model, the state-feedback method was used in order to weaken the resonance peak. Considered the inconvenience of situ measurements, the state observer was designed. Simulation proved the method was feasible. And the separation and transfer function characteristics between state-feedback and observer design were verified.A comprehensive theoretic analyze was carried out on repetitive control system. Simulation improved the method had good control effect. The repetitive control method has strong harmonic suppression ability and good steady-state performance, but also has the disadvantage of delay and lack of dynamic performance, so the PI control and state-feedback control method were used with the repetitive control. The design method and stability of the multiple control were analyzed. Static and dynamic simulation proved the multiple control not only simplified the controller design, but also made the system have stead-state and dynamic-state characteristics.At last, using the TMS320LF2407A as the main chip, the hardware block of the power supply was given. The software design and the implementation of the control method were detailed introduced.