Intelligent micro-grid special inverter and control method thereof

Abstract

The invention discloses an intelligent micro-grid special inverter and a control method thereof. An intelligent micro grid controller controls a rectifier charger for charging an inversion-maintaining storage battery. When voltage of a solar power panel is higher than working voltage of an inverter, the inverter works to supply power into an intelligent micro grid. When voltage of the solar power panel is lower than working voltage of the inverter, the intelligent micro grid controller controls the inversion-maintaining storage battery for discharging toward an input end of a three-phase bridge inverter circuit, so as to keep the inverter working with micro current. When a main grid loses power, the micro intelligent micro grid controller adjusts the discharging capacity of the inversion-maintaining storage battery according to the detected photovoltaic generating capacity and the consumption electricity of an important load, or adjusts the load consumption electricity according to the detected photovoltaic generating capacity and the electric quantity of the inversion-maintaining storage battery. The invention improves the common grid-connected inverter in aspects of structure and control strategy, keeps the inverter in working status, prevents interruption of inverter supplying power to the grid, improves the photovoltaic utilization and ensures continuous power supply to the intelligent micro grid.

Description

technical field [0001] The invention relates to an inverter, in particular to an inverter dedicated to a smart microgrid and a control method thereof, belonging to the technical field of power electronic equipment. Background technique [0002] Common grid-connected inverters in the prior art can only work in a single grid-connected mode. Its working conditions are as follows: 1) The inverter starts to work after the voltage of the photovoltaic panel reaches the start-up voltage during the day, and the inverter stops working at night when the voltage of the photovoltaic panel is lower than the start-up voltage; 2) Even in the daytime, the voltage of the photovoltaic panel When the starting voltage is reached, when the inverter is working, if the main grid loses power, the inverter will immediately start the island protection to stop the inverter power transmission when it detects the grid loses power. [0003] The working mode of the inverter in the prior art stops working ...

AI Technical Summary

Problems solved by technology

[0003] The working mode of the inverter in the prior art stops working when the voltage of the photovoltaic panel is lower than its start-up voltage, and the inverter starts to work when the voltage of the photovoltaic panel reaches the start-up voltage, which will cause the power supply of the inverter to the grid to be cut off. It takes a long time for the inverter to switch from the stopped state to the working state to work normally, which makes the utilization efficiency of photovoltaics not high

[0004] The inverter in the prior art detects that the power grid loses power and activates the island protection, which cannot ensure the safe and stable operation of the microgrid without interruption of power supply.

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