摘要
This paper addresses a new composite controller for a boost-buck inverter to interface the photovoltaic array with the power grid. Based on dynamically tracking the maximum power point, two novel control methodologies are proposed to control the DC-bus and the output current for the inverter. First, a new linear cycle discrete control algorithm is introduced to realize linear control of the DC-bus voltage and synchronously get the reference current for the inner current loop with a little calculation. Then, to assure a good adaptability to noise and model uncertainty, an auto-disturbance rejection controller is chosen as the output current controller, which does not depend on precise mathematics model. Thus, output current of PV system to the grid is with low harmonic distortion and unity power factor. Simulations and experiments are performed, and the results show that the system is of excellent robustness and effective.
This paper addresses a new composite controller for a boost-buck inverter to interface the photovoha-ic array with the power grid.Based on dynamically tracking the maximum power point,two novel controlmethodologies are proposed to control the DC-bus and the output current for the inverter.First,a newlinear cycle discrete control algorithm is introduced to realize linear control of the DC-bus voltage and syn-chronously get the reference current for the inner current loop with a little calculation.Then,to assure agood adaptability to noise and model uncertainty,an auto-disturbance rejection controller is chosen as theoutput current controller,which does not depend on precise mathematics model.Thus,output current ofPV system to the grid is with low harmonic distortion and unity power factor.Simulations and experimentsare performed,and the results show that the system is of excellent robustness and effective.
基金
the National Nature Science Foundation of China(60474041)
National Innovation Fundation of China(05C26224301154).
