A method for controlling the operating state of a hydraulic system of a hydro-turbine governor

Abstract

The application provides a hydraulic system operation state control method of a water turbine governor, a hydraulic system shutdown standby state refers to a state that an isolation valve of the hydraulic system is in a closed position and a hydraulic system pressure tank is not connected with a system loop; a hydraulic system startup process state refers to a process that the position of the isolation valve of the hydraulic system is changed from the closed state to an open state; a hydraulic system running state refers to a state that the isolation valve of the hydraulic system is in the open position and the hydraulic system pressure tank is connected with the system loop; a hydraulic system shutdown process state refers to a process that the position of the isolation valve of the hydraulic system is changed from the open state to the closed state; the hydraulic system shutdown standby state can be converted into the hydraulic system startup process state, the hydraulic system startup process state can be converted into the hydraulic system running state, and the hydraulic system running state can be converted into the hydraulic system shutdown process state. The control logic of the governor hydraulic system is more orderly and intuitive, and it is convenient for engineers to maintain and diagnose faults.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water turbine speed regulation, in particular to a hydraulic system operation state control method of water turbine speed regulator. BACKGROUND

[0002] The water turbine generator set speed regulator adjusts the guide vane opening, the unit power and the frequency, and the operation of the speed regulator hydraulic system needs to be kept stable for a long time. The speed regulator hydraulic system provides the speed regulator system with constant pressure oil, so as to realize the opening and closing of the unit guide vane. In the existing speed regulator hydraulic system control method, only the system pressure is taken as the controlled object, and the definition and twist of the hydraulic system operation state are not established, so that the engineering personnel lack intuitive understanding of the hydraulic system operation state, which is not conducive to fault diagnosis and analysis after the hydraulic system fails. At present, there is no public control method for the operation state of the hydraulic system. SUMMARY

[0003] The present application provides a hydraulic system operation state control method of water turbine speed regulator, which defines the operation state of the hydraulic system of the water turbine speed regulator, including the stop standby state, the start-up process state, the running state and the shutdown process state, and proposes the twist conditions of each operation state in the program. The hydraulic system operation state control method of the water turbine speed regulator has wide applicability, so that the control logic of the speed regulator hydraulic system is more orderly and intuitive, which is convenient for engineering personnel to maintain and diagnose faults.

[0004] In order to realize the above technical features, the purpose of the present application is realized as follows: a hydraulic system operation state control method of water turbine speed regulator, comprising:

[0005] The hydraulic system stop standby state refers to the state that the isolation valve of the hydraulic system is in the closed position, and the hydraulic system pressure tank is not connected with the system circuit;

[0006] The hydraulic system start-up process state refers to the process that the position of the isolation valve of the hydraulic system is changed from the closed state to the open state;

[0007] The hydraulic system running state refers to the state that the isolation valve of the hydraulic system is in the open position, and the hydraulic system pressure tank is connected with the system circuit;

[0008] The hydraulic system shutdown process state refers to the process that the position of the isolation valve of the hydraulic system is changed from the open state to the closed state;

[0009] The hydraulic system stop standby state can be converted into the hydraulic system start-up process state, the hydraulic system start-up process state can be converted into the hydraulic system running state, and the hydraulic system running state can be converted into the hydraulic system shutdown process state.

[0010] Preferably, the twist condition of the hydraulic system stop standby state comprises:

[0011] When the program is initialized or power is restarted, the position feedback contact of the isolation valve is judged, if it is closed, the standby state of shutdown is entered;

[0012] When the hydraulic system is in the shutdown process state, the position feedback contact of the isolation valve is judged, if it is closed, the standby state of shutdown is entered.

[0013] Preferably, the twist condition of the hydraulic system startup process state includes:

[0014] When the hydraulic system is in the standby state of shutdown, if the hydraulic system receives a startup order and the hydraulic system startup condition is met, the startup process state is entered.

[0015] Preferably, the twist condition of the hydraulic system running state includes:

[0016] When the program is initialized or power is restarted, the position feedback contact of the isolation valve is judged, if it is open, the hydraulic system running state is entered;

[0017] When the hydraulic system is in the startup process state, the position feedback contact of the isolation valve is judged, if it is open, the hydraulic system running state is entered.

[0018] Preferably, the twist condition of the hydraulic system shutdown process state includes:

[0019] When the hydraulic system is in the running state, if the hydraulic system receives a shutdown order and the guide vane is fully closed, the shutdown process state is entered.

[0020] Preferably, the startup order and the startup condition meet refer to that the governor hydraulic system receives a hydraulic system startup order from the monitoring system and the startup condition is met;

[0021] The startup condition includes that the oil level of the oil return tank is not lower than the set low oil level, the oil level of the oil press tank is not higher than the set high oil level, all pumps are normal and the oil temperature is not higher than the set high oil temperature.

[0022] Preferably, the shutdown order and the guide vane fully closed refer to that the governor hydraulic system receives a hydraulic system shutdown order from the monitoring system and the guide vane of the hydraulic turbine is in the fully closed position.

[0023] The present application has the following beneficial effects:

[0024] 1. The present application proposes all running states of the hydraulic turbine governor during operation, including the standby state of shutdown, the startup process state, the running state and the shutdown process state, and proposes the twist conditions between the running states, which has wide applicability. BRIEF DESCRIPTION OF DRAWINGS

[0025] The present application will be further described below in combination with the drawings and examples.

[0026] Figure 1This is a flowchart of the present invention. Detailed Implementation

[0027] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] Example 1:

[0030] See Figure 1 A method for controlling the operating status of a hydraulic system for a turbine governor, comprising:

[0031] Hydraulic system standby state: This refers to the state in which the isolation valve of the hydraulic system is in the closed position and the hydraulic system pressure tank is not connected to the system circuit;

[0032] Hydraulic system start-up process: refers to the process in which the isolation valve of the hydraulic system changes from the closed state to the open state;

[0033] Hydraulic system operating state: refers to the state in which the isolation valve of the hydraulic system is in the open position and the hydraulic system pressure tank is connected to the system circuit;

[0034] Hydraulic system shutdown process state: refers to the process in which the isolation valve of the hydraulic system changes from the open state to the closed state;

[0035] The hydraulic system can be switched from a standby state to a start-up state, the start-up state to a running state, and the running state to a shutdown state.

[0036] Furthermore, the torsional conditions for the hydraulic system to be in standby mode include:

[0037] During program initialization or power failure restart, the isolation valve position feedback contact is checked. If it is closed, the system enters a shutdown standby state.

[0038] When the hydraulic system is in the shutdown process state, the position feedback contact of the isolation valve is checked. If it is closed, the system enters the shutdown standby state.

[0039] Furthermore, the torsional conditions during the start-up process of the hydraulic system include:

[0040] When the hydraulic system is in a standby state, if the hydraulic system receives a start-up command and the start-up conditions are met, it will enter the start-up process state.

[0041] Furthermore, the torsional conditions of the hydraulic system during operation include:

[0042] During program initialization or power failure restart, the position feedback contact of the isolation valve is checked. If it is open, the system enters the hydraulic system running state.

[0043] When the hydraulic system is in the start-up process state, the position feedback contact of the isolation valve is checked. If it is open, the system enters the operating state.

[0044] Furthermore, the torsional conditions during the shutdown process of the hydraulic system include:

[0045] When the hydraulic system is in operation, if the hydraulic system receives a stop order and the guide vanes are fully closed, it will enter the stop process state.

[0046] Furthermore, the start-up command and start-up conditions satisfy the condition that the speed controller hydraulic system receives the start-up command from the monitoring system hydraulic system and the start-up conditions are met.

[0047] The start-up conditions include: the oil level in the return oil tank is not lower than the set low oil level, the oil level in the pressure oil tank is not higher than the set high oil level, all pumps are normal, and the oil temperature is not higher than the set high oil temperature.

[0048] Furthermore, the shutdown order and the guide vane fully closed indicate that the governor hydraulic system receives a shutdown order from the monitoring system and the turbine guide vanes are in the fully closed position.

Claims

1. A method for controlling the operating status of a hydraulic system of a turbine governor, characterized in that, include: Hydraulic system standby state: This refers to the state in which the isolation valve of the hydraulic system is in the closed position and the hydraulic system pressure tank is not connected to the system circuit; Hydraulic system start-up process: refers to the process in which the isolation valve of the hydraulic system changes from the closed state to the open state; Hydraulic system operating state: refers to the state in which the isolation valve of the hydraulic system is in the open position and the hydraulic system pressure tank is connected to the system circuit; Hydraulic system shutdown process state: refers to the process in which the isolation valve of the hydraulic system changes from the open state to the closed state; The hydraulic system can be switched from a standby state to a start-up state, the start-up state to a running state, and the running state to a shutdown state. The torsional conditions for a hydraulic system in standby mode include: During program initialization or power failure restart, the isolation valve position feedback contact is checked. If it is closed, the system enters a shutdown standby state. When the hydraulic system is in the shutdown process state, the position feedback contact of the isolation valve is checked. If it is closed, the system enters the shutdown standby state. The torsional conditions during the start-up process of a hydraulic system include: When the hydraulic system is in a standby state, if the hydraulic system receives a start-up command and the start-up conditions of the hydraulic system are met, it will enter the start-up process state. Torsional conditions in the operating state of a hydraulic system include: During program initialization or power failure restart, the position feedback contact of the isolation valve is checked. If it is open, the system enters the hydraulic system running state. When the hydraulic system is in the start-up process state, the position feedback contact of the isolation valve is checked. If it is open, the system enters the operating state.

2. The method for controlling the operating status of a hydraulic system of a turbine governor according to claim 1, characterized in that, The torsional conditions during the shutdown process of a hydraulic system include: When the hydraulic system is in operation, if the hydraulic system receives a stop order and the guide vanes are fully closed, it will enter the stop process state.

3. The method for controlling the operating status of a hydraulic system of a turbine governor according to claim 1, characterized in that, The start-up command and start-up conditions are met when the speed controller hydraulic system receives the start-up command from the monitoring system and the start-up conditions are met. The start-up conditions include: the oil level in the return oil tank is not lower than the set low oil level, the oil level in the pressure oil tank is not higher than the set high oil level, all pumps are normal, and the oil temperature is not higher than the set high oil temperature.

4. The method for controlling the operating status of a hydraulic system for a turbine governor according to claim 1, characterized in that, The shutdown order and the guide vane fully closed indicate that the governor hydraulic system receives a shutdown order from the monitoring system and the turbine guide vanes are in the fully closed position.

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