EIS online detection system and method for hydrogen energy storage power generation system

The invention provides an EIS online detection system and method for a hydrogen energy storage power generation system. In a hydrogen energy storage power generation application scene, the EIS online detection system is composed of an excitation signal module, a PWM drive circuit, a current and voltage sampling module, a control system module and a fault diagnosis module, and can realize the functions of EIS online measurement, fault diagnosis, DC/DC converter integration, power output and the like. Comprising the following steps: injecting a multi-frequency sinusoidal signal optimized by an improved particle swarm algorithm into a DC/DC converter to excite a battery; sampling voltage and current data in real time and obtaining impedance information; and establishing a fault diagnosis model of the support vector machine, training by using the fault features and the label data set, and carrying out fault diagnosis and verification. The problems that in-situ detection complexity of the fuel cell in the hydrogen