Research On Photovoltaic Grid-connected With Reactive Power Compensation And Harmonic Restrain

According to the characteristics of inverter main circuits normally used in photovoltaic grid-connected systems, a novel control strategy is proposed for a photovoltaic grid-connected system, in which a photovoltaic generation is with reactive power compensation and harmonic restrain. In this way, photovoltaic grid-connected systems can provide not only active power, but also reactive power, which simplifies system configuration, improves the power quality of mains with saving the investment of the equipment. The system has broad prospect.A one-phased photovoltaic grid-connected systems topology with reactive power compensation, MPPT is proposed. And its operation principle and math model are further analyzed. This article emphasizes MPPT and power compensation.According to the MPPT theory, solar battery of characteristic is introduced. A novel algorithm on MPPT is proposed, which can find the maximum power point (MPP) when solar radiation is changing rapidly. This ensures the small swing of solar array voltage in the process of searching the MPP. A dynamic model of the single phase grid-connected PV system is developed using POWER SYSTEM BLOCKSETS tool of the MATLAB. All those works provided considerable significance and concrete helps for designing the circuit hardware of the system. The theoretical predictions are verified with the simulation results.Base on APF theory, the control strategy is proposed for a photovoltaic grid-connected system, in which a photovoltaic generation is with reactive power and active filter. We use the MATLAB to verify the control theory. The special DSP chip of TMS320LF2407 that produced by TI Company is used as main controller of the system. In addition, the software and hardware design proposal.