Fault diagnosis and protection system of air compressor for fuel cell system

Abstract

The invention discloses a fault diagnosis and protection system of an air compressor for a fuel cell system. The fault diagnosis and protection system comprises a controller, a high-speed motor and the air compressor, the controller is provided with a voltage conversion circuit, a sampling circuit, a main control chip and a fault diagnosis module, and the sampling circuit comprises a power supplyvoltage sampling circuit, a motor phase current sampling circuit and a bus voltage sampling circuit; and the main control chip is provided with an ADC sampling module, the voltage conversion circuit and the sampling circuit are connected with the ADC sampling module, the fault diagnosis module is connected with the main control chip, and the fault diagnosis module classifies faults into an early warning fault, a first-class fault, a second-class fault and a third-class fault according to the triggering time and importance degree of the faults. According to the fault diagnosis and protection system, comprehensive state monitoring and protection can be carried out on the air compressor for the fuel cell system, derating, early warning or shutdown processing can be carried out according to the working state, the accuracy and comprehensiveness of state monitoring are improved, and the stability and safety of the whole fuel cell system are further improved.

Description

technical field [0001] The invention relates to the technical fields of compressor technology and permanent magnet synchronous motor control, in particular to a fault diagnosis and protection system for an air compressor used in a fuel cell system. Background technique [0002] Under the background pressure of fuel energy shortage and increasing pollution, the world is actively promoting energy conservation, emission reduction, and development of new energy. Fuel cell vehicles have gradually become an important development direction of new energy vehicles with the advantages of zero pollution, renewable, and sufficient battery life. . The oxygen supply system in the fuel cell system plays an important role. Reliable, stable and efficient oxygen supply can make the fuel cell system fully perform and improve the overall energy utilization efficiency. The main part of the oxygen supply system is the air compressor control system, also It belongs to the key technology in the fu...

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Problems solved by technology

[0003] Conventional inverters can drive motors with a speed of less than 10,000 rpm / min, the speed is low, and the fault diagnosis mechanism is not completely suitable for the fuel cell air compressor control system. It only has conventional power supply voltage and motor abnormality handling mechanisms. Cannot be directly applied to the fuel cell air compressor control system

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