Research Based On The DSP Photovoltaic Grid-Connected Inverter Control Strategy

Solar energy as a clean, renewable energy is gradually applied on many occasions.The photovoltaic power generation in addition to supply independent of load, but alsoneed the grid with. Study on photovoltaic grid-connected generation system core issues:solar cell maximum power point tracking, inverter topology and control strategy ofgrid-connected inverter, the output current and voltage and grid synchronization problems,islanding prevention technology, inverter output power calculation.This paper uses three-phase photovoltaic grid-connected generation system as theresearch object, the three-phase photovoltaic grid-connected power in some keytechnologies are studied in detail, the main contents are as follows:1．studies the domestic and foreign development of photovoltaic industry statusquo, analysis of Japan, Germany, the United States of America and other developedcountries in photovoltaic industry current situation and development trend. Briefintroduction of countries in the photovoltaic industry policy, summed up ourdeficiencies in this area. This paper also on the photovoltaic system classification,topological structure were described in detail.2．pairs of photovoltaic system solar cell of mathematical modeling, and usingMatlab/Simulink simulation tool are analyzed, it is concluded that the maximum powertracking (MPPT) necessity. A detailed study of the current commonly used maximumpower tracking algorithm, and gives the algorithm flowchart, and analyzes theiradvantages and disadvantages.3． Analysis of three level inverter principle and topology structure, controlstrategy of grid-connected inverter, the three-phase photovoltaic grid-connected inverterhardware, software design. Given this based on voltage space vector pulse widthmodulation (SVPWM) PI current control strategy theoretical analysis process.4．Analysis of voltage space vector pulse width modulation (SVPWM) principle,preparation of space voltage vector pulse width modulation (SVPWM) algorithmsoftware, and presents a digital signal processor (DSP) TMS320F2407on therealization of the method, analyses its correctness is proved.