The Research Of Photovoltaic Grid Connected Inverter Controlled By Microprocessor

The thesis according to the analysis of Grid-connected inverter, considering of the singlestage topology and multistage topology, and including the Phase-Lock Control and the waveof pulse-width modulation and so on, and then we decided the topology structure of the maincircuit.The main circuit of Grid-connected inverter contains two topology, we call theDC-DC-AC topology, according to the analysis of the states of the basic BOOST circuit,leading to the DC/DC topology, interleaving parallel Boost circuit. We use it to finish theboost of direct voltage, and the same time use software PSpice simulate interleaving parallelBoost circuit, which gives the simulation waves of voltage and current of the key parts ofthe circuit, the other DC/AC topology, we induct the control method of Sine-wavePulse-width Modulation and the overview of the Resonant Converter, and then draw in theanalysis the Quasi-Resonant Converter, which can be used to come true the inverter of DC toAC, and at the same time using the Phase-Lock control finishing the same channel and thesame phase, in base of the theoretical analysis of the circuit layout giving the calculatemethod of parameters of key components of the circuit, to finish the Printed Circuit Board.Secondly, the control circuit uses the Single-chip Microcomputer P87C554controls theinverter, in base of circuit of peripheral circuit, finishing the control circuit which contains themodulating control of the output voltages of the DC/DC, and the feedback signals of thevoltage loop and the current loop, that can be finished by the programming of the Single-chipMicrocomputer.Finally, according to the debugging of the software and the hardware, to come true thepossibility of the design based on the experiment results.