Photovoltaic (pv) grid system to MSP430F169 microcontroller as the core, the microcontroller output SPWM waveform by IR2110 driver H bridge, realize DC- AC inverter. Maximum power point (MPPT) with absolute error less than 1 , using 430 single chip microcomputer software phase-locked loop, with the reference frequency as a benchmark, external interrupt and timer of MSP430 single chip microcomputer phase, when the voltage feedback signal phase lag (advanced) in the phase of reference signal, will increase (decrease) of SPWM frequency To achieve phase and frequency synchronization. Including impedance load, as well as non resistance load, has realized the frequency tracking and phase tracking. DC- AC conversion efficiency up to 88 , and the man-machine interface LCD liquid crystal display, intuitive interface, concise, shows that the output voltage, current, has the good man-machine interactive performance.

photovoltaic grid-connected system.pdf

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