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 ...

Examples

Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] like figure 1 As shown, the special inverter 2 for smart microgrid of the present invention includes EMI DC filter 3, three-phase bridge inverter circuit 4, L filter 5, EMI AC filter 6, smart microgrid controller 7, smart Monitor 8, maintain inverter storage battery 9, rectifier charger 10, circuit breaker QF1, circuit breaker QF2; It is connected to the input end of the three-phase bridge inverter circuit 4, the output end of the three-phase bridge inverter circuit 4 is connected to one end of the L filter 5, and the other end of the L filter 5 is connected to the input end of the EMI AC filter 6 The output end of the EMI AC filter 6 is connected to one end of the intelligent monitor 8 after passing through the circuit breaker QF1, the other end of the intelligent monitor 8 is connected to the load, the main power grid is connected to ...

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 ...

Examples

Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] like figure 1 As shown, the special inverter 2 for smart microgrid of the present invention includes EMI DC filter 3, three-phase bridge inverter circuit 4, L filter 5, EMI AC filter 6, smart microgrid controller 7, smart Monitor 8, maintain inverter storage battery 9, rectifier charger 10, circuit breaker QF1, circuit breaker QF2; It is connected to the input end of the three-phase bridge inverter circuit 4, the output end of the three-phase bridge inverter circuit 4 is connected to one end of the L filter 5, and the other end of the L filter 5 is connected to the input end of the EMI AC filter 6 The output end of the EMI AC filter 6 is connected to one end of the intelligent monitor 8 after passing through the circuit breaker QF1, the other end of the intelligent monitor 8 is connected to the load, the main power grid is connected to ...

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