Ultra-supercritical unit DEH system control valve redundancy control module and method

Abstract

The invention discloses an ultra-supercritical unit DEH system control valve redundancy control module and method. The requirements of a servo card of a million ultra-supercritical unit DEH control system for the stability, the response time and the control precision are met. The control valve redundancy control module comprises a computer, a VC1352D redundancy control module, a coil, a steam turbine control mechanism, a linear differential displacement sensor and an EPDF-SD module, wherein the VC1352D redundancy control module is used for detecting an LVDT signal; the servo system and an on-site steam turbine control mechanism form a servo follow-up system for controlling the stroke of the hydraulic servo-motor by controlling voltage/current, and control over the hydraulic servo-motor is achieved, so that the steam inlet amount of a steam turbine is changed, and output power adjustment of the steam turbine is achieved. The running states of a main card and a standby card of the VC1352D redundancy control module can be monitored in real time, effective control over a steam turbine control valve is guaranteed, and undisturbed switching of servo cards is achieved.

Description

technical field [0001] The invention belongs to the technical field of electromechanical equipment, and in particular relates to a redundant control module and method for a DEH system of an ultra-supercritical unit. Background technique [0002] The speed regulation and load control of the steam turbine have always relied on the oil motor, and the control of the oil motor is completed through the electro-hydraulic servo valve. In a conventional unit, one servo card corresponds to one valve, and a redundant mode of dual instructions and double feedback is adopted on the servo card to ensure safety. The control system servo card of the DEH control system of a million ultra-supercritical unit requires redundancy of the servo card. Configuration, the main and standby card outputs drive their corresponding servo coils to ensure that the outputs act in the same direction and switch without disturbance, thus ensuring the safety of the unit. [0003] Chinese utility model patent CN...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a redundant control module and method for regulating the gate of the DEH system of an ultra-supercritical unit in order to solve the deficiency that the servo card cannot be switched online without disturbance when an accident occurs in the steam turbine gate control system in the prior art

Images