Research Of Single-Pole SPWM Inverters Based On Repetitive Control Technique

With the development of modern industry, science and technology, power supply becomes more and more important in work and life. But many users' devices can't work with AC directly provided by public electricity, which should be converted, by power electronics technique, to the forms needed. DC-AC inverters, especially sinusoidal inverters, which convert alternating current to direct current, are various, widely used and excellent. Therefore, High performance inverters have been one of points of power electronics.As one of inverters, Sinusoidal Pulse Width Modulation (SPWM) inverters can achieve low total harmonic distortion (THD) output wave. With the development of digital control techniques, the production of SPWM and digital control of inverters become convenient, which makes the output wave's steady-state precision, transient and steady state response, reliability improved. In addition, performances' improvements of the inverters are also based on closed-loop control of output wave. Pure digital control technique, such as repetitive control, digital PID control, sliding mode control and one-cycle control, have being used in these fields.This paper studies a single phase voltage SPWM inverter based on repetitive control, whose key point is achieving a good sinusoidal output wave. Firstly, this paper detailed discusses the inverter system's working characters and mathematic model. Then repetitive control technique and the choice of its parameters, the whole system's stability, the strategy of closed-loop control are discussed. Finally,...