Research On Photovoltaic Grid-Connected Inverter Based On DSP

Fossil energy reserves of the world’s limited is the main factor to develop renewable energy; Fossil energy of a large number of mining is the main cause of ecological damage; Use of fossil fuels is the main cause of global environmental pollution. In order to the sustainable development of modern society, development and utilization of renewable energy is imperative. solar energy as a clean renewable energy, in the development and utilization, no secondary energy consumption and no secondary pollution, attaches great importance to by the people. Photovoltaic grid power generation as the main form of solar photovoltaic utilization, will get rapid development.In this background, this paper on the photovoltaic grid power generation system in the core components of photovoltaic grid inverter for the deeper research, to maximize the solar pv array output dc can be converted into ac power, and feed to the power grid as the main target, adopts TMS320F28035digital microprocessor of TI company as control core, carry out the theory and practice of photovoltaic grid power generation system research.First analysis compares the photovoltaic grid-connected inverter main circuit topology and control strategy, determine the design of photovoltaic grid-connected inverter with high-frequency transformer isolation of two-stage topology, and analysis of the system adopts two level control strategy; secondly, analyzes the model and the characteristics of solar photovoltaic cells, comparing the several kinds of commonly used maximum power point tracking (MPPT) control method, to determine in this paper, difference method is adopted to improve the MPPT. and aimed at two levels of structure of this paper proposes detailed MPPT photovoltaic grid-connected inverter control procedures to achieve process; then, according to the whole control scheme, the hardware and software design of the system, the system main circuit, sampling and the design of the protection circuit in detail, and presents the whole system and the control flow chart of each interrupt service routine; finally. make prototype, associated test experiments, the experimental results verify the reliability of the design of photovoltaic grid-connected inverter in this paper...