A self-diagnosis and self-positioning self-adaptive method for the neutral position of the hydraulic servo system of the governor

Abstract

A method for self-diagnosis and self-positioning of the center position of the hydraulic servo system of the governor. The electric control system of the governor collects the main distribution position feedback M and the main distribution position setting M 给定 and other data; to detect whether the hydraulic servo system of the governor is in static balance, the criterion is: the main distribution position is given M 给定 Keep it unchanged, if it is satisfied, carry out self-diagnosis of the neutral position of the governor proportional valve, otherwise wait for the criterion condition to be met; perform self-diagnosis of the neutral position drift of the governor proportional valve, the criterion is: the main distribution position feedback M is not equal to the main distribution position Position given M 给定 ;if M=M 给定 , then the median setting value of the proportional valve B 0 The setting is reasonable, equal to the actual median value B of the proportional valve 0实际 , enter the middle position diagnosis link of main distribution; if M≠M 给定 , proportional valve median drift, proportional valve median setting value B 0 The setting is unreasonable, and the electrical neutral position of the proportional valve is corrected. The invention solves the adjustment quality problems such as the frequent adjustment of the hydraulic servo system of the governor and the inability to adjust the opening of the guide vane due to the drift of the electrical neutral position of the main configuration of the governor and the proportional valve, so as to adapt to the current operating conditions.

Description

technical field [0001] The invention relates to a self-diagnosis and self-positioning self-adaptation method for a hydraulic servo system of a speed governor, which belongs to the field of automatic control of hydropower stations. Background technique [0002] During the grid-connected operation of the hydro-generator set, the position sensor of the governor hydraulic servo system actuator (such as the main distribution) and the output module of the governor electronic control system (such as the proportional valve drive module) are subject to temperature changes, power supply voltage fluctuations, etc. Affected by factors such as stability, there is inevitably a zero drift phenomenon, which leads to a shift in the electrical neutral position of the hydraulic actuator of the governor. The drift of the neutral position of the main distribution electrical system is serious to a certain extent, which will lead to small and frequent fluctuations in the opening of the guide vane,...

AI Technical Summary

Problems solved by technology

Solve the adjustment quality problems such as the frequent adjustment of the hydraulic servo system of the governor and the inability to adjust the opening of the guide vane due to the drift of the electrical neutral position of the main distribution of the governor and the proportional valve, so as to adapt to the current operating conditions

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