CN-116753212-B - Diagnosis method for temporary static health sign of guide valve of hydraulic servo system of speed regulator

Abstract

The method for diagnosing the temporary static health sign of the guide valve of the hydraulic servo system of the speed regulator calculates temporary static health sign signals and the change rate of the temporary static health sign signals of the guide valve of the hydraulic servo system in real time, diagnoses the temporary static health state of the guide valve of the hydraulic servo system in real time, alarms in time and sends alarm signals to a monitoring system when the performance of the guide valve and the hydraulic servo system where the guide valve is positioned is reduced or a fault trend occurs, and reminds operation maintenance personnel to carry out preventive maintenance. Meanwhile, the method has a criterion self-adaption function, can self-learn a guide valve temporary static health sign signal reference value in a real-time correction criterion condition, and improves diagnosis accuracy.

Inventors

• TU YONG

Assignees

• 中国长江电力股份有限公司

Dates

Publication Date

20260505

Application Date

20230605

Claims (1)

1. 1. The diagnosis method of the pilot valve temporary static health sign of the hydraulic servo system of the speed regulator is characterized by comprising the following steps of: Initializing, namely giving an initial value to K1, guiding a valve-adjacent static health sign signal K=0, and entering a step 2, wherein an intermediate variable i=1; Wherein K1 is a guide valve temporary static health state criterion parameter, and K1 * is a guide valve temporary static health sign signal reference value; Step 2, acquiring a valve core position setting M Given a given of the main distributing valve in real time, and entering a step 3; Step 3, if M Given a given =0, then enter step 4, otherwise, K=0, return to step 2; Step 4, collecting the position feedback of the valve core of the pilot valve in real time, namely M Guiding device , and the position feedback of the valve core of the main pressure distribution valve, namely M Main unit , calculating the difference value delta M=M Guiding device -M Main unit between the position feedback M Guiding device of the valve core of the pilot valve and the position feedback M Main unit of the valve core of the main pressure distribution valve, and entering step 5; step 5, if the valve core position feedback M Main unit of the main distributing valve is kept unchanged, entering a step 6, otherwise, returning to the step 4, wherein K=K+delta M; Step 6, if i is not equal to 1, K * ＝(K1 * +K)/2 is added to step 7, otherwise, the pilot valve is adjacent to a static health sign signal reference value K * =K, i=0, and step 10 is added; wherein K1 * is a guide valve threshold static health sign signal reference value; Step 7, calculating a change rate K1= |K-K1 * |/K1 * of the guide valve critical static health sign signal, and entering step 8; step 8, if 1>1 sampling periods are kept, guiding the valve to alarm and output the static health sign, and entering step 9, otherwise, entering step 10; Wherein 1 is a guide valve critical static health state criterion parameter; Step 9, if the fault is found, confirming that the fault is processed, and manually operating to reset the alarm information, entering a step 10, otherwise, returning to the step; Step 10, if M Given a given is not equal to 0, returning to step 2, otherwise, returning to the step.

Description

Diagnosis method for temporary static health sign of guide valve of hydraulic servo system of speed regulator Technical Field The invention relates to the technical field of guide valve health state diagnosis, in particular to a guide valve temporary static health sign diagnosis method of a hydraulic servo system of a speed regulator. Background Pilot valves are widely used in industrial automation control and often are a critical element in control systems. The health condition of the guide valve determines whether the system can safely and stably operate, and important attention should be paid. The method and the system for diagnosing the health state of the intelligent pilot valve with the pilot valve health state indication are not disclosed at present, only a few methods and systems for diagnosing the health state of the proportional valve and the main pressure distribution valve of the hydraulic turbine are disclosed, and the method and the system are respectively a method for diagnosing the health state of a hydraulic servo system of a hydraulic power station speed regulator and a control system (ZL: 202011428926.2) of the hydraulic power station speed regulator, a method for diagnosing the health state of the proportional valve and a control system (ZL: 202011432317.4) of the hydraulic power station speed regulator of China, and when the health state of the main pressure distribution valve and the proportional valve is lowered, the performance of the hydraulic servo system where the main pressure distribution valve and the proportional valve are lowered is reduced or a fault trend occurs, an alarm signal is timely given out and sent to a monitoring system to remind operation maintenance personnel to carry out preventive overhaul and maintenance, and a blank exists in the field of diagnosing the health state of the pilot valve, so that research and exploration of the method and the system for diagnosing the health state of the pilot valve have great practical significance. Disclosure of Invention The invention provides a diagnosis method for a temporary static health sign of a guide valve of a hydraulic follow-up system of a speed regulator, which is suitable for a hydroelectric generating set using a stepping motor and a guide valve as electrohydraulic conversion devices, and aims to realize real-time monitoring of a valve core position feedback signal of the guide valve and a valve core position feedback signal of a main distributing valve by an electronic control system of the speed regulator in the running process of the generating set. Meanwhile, the method has a criterion self-adaption function, can self-learn a guide valve temporary static health sign signal reference value in a real-time correction criterion condition, and improves diagnosis accuracy. The technical scheme adopted by the invention is as follows: The diagnosis method of the pilot valve temporary static health sign of the hydraulic servo system of the speed regulator comprises the following steps: step 1, initializing a controller of an electric control system of a speed regulator, giving an initial value K1, guiding a valve-adjacent static health marking signal K=0, and entering a step 2 by using an intermediate variable i=1; Wherein K1 is a guide valve temporary static health state criterion parameter, and K1 * is a guide valve temporary static health sign signal reference value. Step 2, the controller of the speed regulator electric control system acquires the valve core position set M Given a given of the main distributing valve in real time, and the step 3 is entered; Step 3, if M Given a given =0, then enter step 4, otherwise, K=0, return to step 2; Step 4, the controller of the electric control system of the speed regulator acquires the position feedback of the valve core of the pilot valve in real time and records the position feedback of the valve core of the pilot valve as M Guiding device and the position feedback of the valve core of the main distributing valve as M Main unit , calculates the difference value delta M=M Guiding device -M Main unit between the position feedback of the valve core of the pilot valve M Guiding device and the position feedback of the valve core of the main distributing valve and enters step 5; step 5, if the valve core position feedback M Main unit of the main distributing valve is kept unchanged, entering a step 6, otherwise, returning to the step 4, wherein K=K+delta M; Step 6, if i is not equal to 1, K *＝(K1* +K)/2 is added to step 7, otherwise, the pilot valve is adjacent to a static health sign signal reference value K * =K, i=0, and step 10 is added; Wherein K1 * is a guide valve threshold static health sign signal reference value. Step 7, the controller of the electric control system of the speed regulator calculates the change rate K1= |K-K1 *|/K1* of the guide valve critical static health sign signal, and the step 8 is entered; step 8, if 1>1 sampling periods are kept