Research Of Residential Photovoltaic Grid-connected Inverter Based On SOPC

Along with traditional fossil energy depletion, environmental pollution worsening and increasing the environmental awareness of mankind, the solar energy as an environmentally friendly energy, has become one of an important part in the world's future energy strategies. In many applications of the solar energy, the photovoltaic power generation technology is one of the most promising, and as the mainstream solar applications. The inverter as an integral part of the photovoltaic grid-connected system has accessed to a wide range of research.In this paper, the structures and system control algorithms of the current photovoltaic inverter are analysed by developing the "residential photovoltaic grid-connected inverter system based on SOPC". Some parts of the important inverter are designed based on SOPC technology based on the above analysis, and each part is simulated.In this paper, several methods for the maximum power point tracking are introduced firstly, and the variable step method for optimizing a detailed analysis. Variable step optimization method is realized by Verilog HDL, and conducted a functional simulation. The PWM signal driving circuit is designed and simulated in Multisim10.0 software. Inverter control part is designed. The dual closed loop control structure of DC voltage outer loop and grid-current inner loop is used. The PLL module,PI module,sine wave generator module,SPWM module are realized and simulated by Verilog HDL. The energy measure in principle is analysed, and the electric energy measurement part is designed. In the measurement part, filter,multipliers,digital-frequency converter counter modules are realized and simulated by the Verilog HDL. The monitoring and communication module of the inverter is designed. Through this module, the system can send the fault signal and the power generation of to the control center.