Ultra-micro-flow high-pressure hydrogen accurate injection system and method

The invention relates to an ultra-micro-flow high-pressure hydrogen accurate injection system and method. The ultra-micro-flow high-pressure hydrogen accurate injection system can achieve ultra-micro-flow high-pressure hydrogen accurate injection. The system comprises a hydrogen inlet, a hydrogen outlet, a system pipeline portion and an electrical control portion. The system pipeline portion comprises an upstream main pipeline, a high-flow path, low-flow paths and a downstream main pipeline. The high-flow path is sequentially provided with a needle stop valve, a high-flow multi-hole flow limiter, a high-flow controller and a needle stop valve, and the high-flow controller is connected with a transmitter through a cable and then is connected to a power plant control system. Each low-flow path is sequentially provided with a needle stop valve, a low-flow multi-hole limiter, a low-flow controller and a needle stop valve, the low-flow controller is connected with a transmitter through a cable and then is connected to the power plant control system. The high-flow path and the low-flow paths are connected with the downstream main pipeline, and the electrical control portion is connected to an anti-explosion junction box and then is connected to the power plant control system.