Research On The Photovoltaic Grid-connected Power Conditioner System And Its Control Strategies

With the development of power electronics technology, PV technology has made great progress. It has the full display of the future major green energy potential. PV grid-connected technology of PV technology as an important branch has a broad development space and applications.The photovoltaic power conditioning system as the research object in this paper, In-depth study to solve problems of grid-connected PV technology, according to the relationship between APF and grid inverter circuits, active filtering principle is applied to grid-connected PV system, making power generation systems can not only accomplish Photovoltaic power generation efficiently, but also do reactive power compensation and harmonic suppression for the grid. Thereby with increasing the efficiency of photovoltaic grid and grid power factor, it can achieve the purpose of improving the power quality. With equipment cost savings and expanding the application of distributed photovoltaic system,the function of the whole system only through the process of the inverter output .With in-depth study of the reactive and harmonic current detection method based on instantaneous power theory,it combine the control strategy of the maximum power output of PV array and photovoltaic power compensation together. Under the program command current signal is generated by both of the instantaneous reactive power and harmonic current signals and current signal of the maximum power output of photovoltaic arrays. On this basis, with established a model of grid-connected inverter, It control the output waveform of the inverter with good control effect through the hybrid control theory which combine the repetitive control and state feedback control theory,Finally, based on the analysis of the study, it designs the system's hardware and software process, the PV grid-connected system model is built based on the MATLAB, the effectiveness of the whole control strategy is verified.