Water turbine servo valve redundancy control system and operation method thereof

The invention belongs to the technical field of hydroelectric generation systems, and discloses a hydraulic turbine servo valve redundancy control system and an operation method thereof. The hydraulic turbine servo valve redundancy control system comprises a first analog quantity input module, a second analog quantity input module, a servo card, a first analog quantity output module, a second analog quantity output module, a servo valve, a driving device, a first linear variable differential transformer and a second linear variable differential transformer. The two linear variable differential transformers are arranged to collect the opening and closing degree of the water turbine control valve, and the problem of system shutdown caused by the fault of a single variable differential transformer can be effectively avoided; signals are respectively transmitted to the two coils of the servo valve through the two analog quantity output modules, so that redundancy control of the servo valve in the system can be re