Control strategy of solar inverter

Solar panels inverter systems control scheme is: photovoltaic battery converse solar energy into electrical energy, and the series parallel tuned to DC voltage which meet the SPWM inverter, through inverter and filter inductor formed and grid voltage with the same frequency and phase of sinusoidal current, the realize the grid inverter using SPWM (sine pulse width modulation) inverter technology.
According to the periodic condition of power system, the following 3 conditions should be satisfied when the SPWM inverter circuit is connected to the grid:
1.In the renewable energy feedback system, the output voltage of the inverter is close to that of the city power, and the pressure difference should be less than 10%.
2.Inverter output frequency close to the frequency of the city power, the general frequency difference is not more than 0.4Hz.
3.Inverter output current and the city electric voltage phase is same, usually this phase difference should not exceed 10 degrees. PV grid connected inverter control is the key of the inverter design, the use of advanced control technology is the key technology to improve the performance of the solar inverter. With the high frequency of power electronic devices and the improvement of microprocessor operation speed, it is possible that some advanced control strategies can be applied to the photovoltaic grid connected control.

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