Control method of hydrogen fuel cell emergency power supply system

Abstract

The invention discloses a control method of a hydrogen fuel cell emergency power supply system, and the method comprises the following steps: judging a power grid voltage state according to a power grid input end voltage value, and entering a power grid mode if the power grid has a voltage; carrying out the power supply switching according to the SOC value of the energy storage unit in the power grid mode; if the power grid has no voltage, further judging whether the voltage exists in the previous step time, and if the voltage exists before the previous step time, entering a power-off mode; in the power-off mode, carrying out the power supply adjustment through the power of the hydrogen fuel cell and the SOC value of the energy storage unit; if no voltage exists before the previous step time, entering an off-grid mode; in the off-grid mode, carrying out the power supply adjustment according to the SOC value of the energy storage unit, the load power and the hydrogen fuel cell power. According to the invention, electric energy is rapidly provided when the power grid is powered off, the control precision is high, the threshold SOC values of different types of energy storage units can be automatically set, and the control performance is better; and mutual matching of operation and environment of the hydrogen fuel cell emergency power supply system can be ensured.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, in particular to a control method for a hydrogen fuel cell emergency power supply system. Background technique [0002] The normal power supply of important places such as hospitals, schools, and government departments is extremely important. When the power grid fails, the emergency power supply system should be activated immediately to quickly restore power consumption, provide high-power DC / AC power, and continuously ensure the supply of electric energy. Important places are operating normally. In addition, emergency power supply systems are often used in major emergency rescue and disaster relief sites such as rain and 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 density, whi...

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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