A kind of control method of hydrogen fuel cell emergency power supply system

Abstract

The invention discloses a control method for a hydrogen fuel cell emergency power supply system. The grid voltage state is judged according to the voltage value of the grid input terminal. If the grid has voltage, the grid mode is entered; in the grid mode, power supply switching is performed according to the SOC value of the energy storage unit. ; If there is no voltage in the power grid, further judge whether there is voltage at the previous step time, if there is voltage before the previous step time, enter the power-off mode; in the power-off mode, the power of the hydrogen fuel cell and the energy storage unit are used. The SOC value is used to adjust the power supply; if there is no voltage before the previous step time, it enters the off-grid mode; in the off-grid mode, the power supply is adjusted by the SOC value of the energy storage unit, the load power and the power of the hydrogen fuel cell. The invention provides electric energy quickly when the power grid is powered off, has high control precision, can realize automatic adjustment of the threshold SOC value of different types of energy storage units, and has good control performance; and can ensure the operation of the hydrogen fuel cell emergency power supply system and the environment. match.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a control method of an emergency power supply system of a hydrogen fuel cell. Background technique [0002] The normal power supply of hospitals, schools, government departments and other important places is extremely important. When the power grid is out of power, the emergency power supply system should be activated immediately to quickly restore power consumption, provide high-power DC / AC power supply, and continuously ensure the supply of electric energy. Important places operate normally. In addition, emergency power supply systems are often used in major rescue and disaster relief sites such as rain, snow, earthquakes, and floods. [0003] Common emergency power supply devices mainly include battery packs, diesel engines, etc., but battery packs have disadvantages such as heavy weight, inconvenient transportation, slow charging speed, and insufficient energy...

AI Technical Summary

Problems solved by technology

[0003] Common emergency power supply devices mainly include battery packs, diesel engines, etc., but battery packs have disadvantages such as heavy weight, inconvenient transportation, slow charging speed, and insufficient energy density, while diesel engines are noisy and emit soot particulate matter (PM), hydrocarbons, etc. Substances that pollute the environment such as HC, CO and NOx

The existing emergency power supply device cannot quickly provide electric energy when the power grid is cut off. The corresponding real-time performance is poor, the control accuracy is low, and the control performance is poor. It is impossible to ensure that the operation of the hydrogen fuel cell emergency power supply system matches the environment.

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