Running state control method for hydraulic system of hydraulic turbine governor

Abstract

The invention provides a hydraulic turbine governor hydraulic system operation state control method. In a hydraulic system shutdown standby state, an isolation valve of a hydraulic system is in a closed position, and a pressure oil tank of the hydraulic system is not communicated with a system loop; the starting process state of the hydraulic system refers to the process that the position of an isolating valve of the hydraulic system is converted into an opening state from a closing state; the operating state of the hydraulic system refers to a state that an isolating valve of the hydraulic system is in an opening position and a pressure oil tank of the hydraulic system is communicated with a system loop; the shutdown process state of the hydraulic system refers to the process that the position of an isolating valve of the hydraulic system is converted into a closed state from an open state; the hydraulic system shutdown standby state can be converted into a hydraulic system startup process state, the hydraulic system startup process state can be converted into a hydraulic system operation state, and the hydraulic system operation state can be converted into a hydraulic system shutdown process state. The control logic of the hydraulic system of the speed regulator is more orderly and visual, and maintenance and fault diagnosis of engineers are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine speed regulation, and in particular to a method for controlling the operating state of a hydraulic system of a water turbine speed regulator. Background Art

[0002] The speed governor of a hydro-turbine generator set adjusts the guide vane opening, unit power and frequency, and requires the operation of the governor hydraulic system to remain stable for a long time. The governor hydraulic system provides a continuous supply of pressure oil to the governor system, thereby realizing the opening and closing of the unit guide vanes. In the existing control method of the governor hydraulic system, only the system pressure is used as the controlled object, and the definition and reversal of the hydraulic system operation state are not established, which makes the engineering personnel lack an intuitive understanding of the hydraulic system operation state, which is not conducive to the fault diagnosis and analysis after the hydraulic system fails. However, a universal control method for the hydraulic system operation state has not yet been disclosed. Summary of the invention

[0003] The present invention provides a method for controlling the operating state of a hydraulic system of a turbine governor. The method defines the operating state of the hydraulic system of the turbine governor, including a shutdown standby state, a startup process state, an operating state, and a shutdown process state, and proposes a torsion condition for each operating state in a program. The method for controlling the operating state of a hydraulic system of a turbine governor of the present invention has wide applicability, makes the control logic of the hydraulic system of the governor more orderly and intuitive, and is convenient for maintenance and fault diagnosis by engineering personnel.

[0004] In order to realize the above technical features, the object of the present invention is achieved as follows: A method for controlling the operating state of a hydraulic system of a turbine governor comprises: Hydraulic system shutdown standby state: refers to the state where the isolation valve of the hydraulic system is in the closed position and the hydraulic system pressure oil tank is not connected to the system circuit; Hydraulic system startup process state: refers to the process in which the isolation valve position of the hydraulic system changes from the closed state to the open state; Hydraulic system operating state: refers to the state where the isolation valve of the hydraulic system is in the open position and the hydraulic system pressure oil tank is connected to the system circuit; Hydraulic system shutdown process state: refers to the process in which the isolation valve position of the hydraulic system changes from an open state to a closed state; The hydraulic system shutdown standby state can be converted into a hydraulic system startup process state, the hydraulic system startup process state can be converted into a hydraulic system operating state, and the hydraulic system operating state can be converted into a hydraulic system shutdown process state.

[0005] Preferably, the torsion conditions of the hydraulic system in the shutdown standby state include: When the program is initialized or restarted after power failure, the isolation valve position feedback contact is judged. If it is closed, the machine enters the shutdown standby state; When the hydraulic system is in the shutdown process state, the isolation valve position feedback contact is judged. If it is closed, it enters the shutdown standby state.

[0006] Preferably, the torsion conditions of the hydraulic system startup process state include: When the hydraulic system is in the shutdown standby state, if the hydraulic system receives a start-up command and the hydraulic system start-up conditions are met, it enters the start-up process state.

[0007] Preferably, the torsion conditions of the hydraulic system operation state include: When the program is initialized or restarted after power failure, the isolation valve position feedback contact is judged. If it is open, the hydraulic system enters the operating state; When the hydraulic system is in the startup process state, the isolation valve position feedback contact is judged. If it is open, the hydraulic system enters the running state.

[0008] Preferably, the torsion conditions of the hydraulic system shutdown process state include: When the hydraulic system is in operation, if the hydraulic system receives a shutdown command and the guide vanes are fully closed, it enters the shutdown process state.

[0009] Preferably, the start-up order and the start-up conditions are satisfied, which means that the governor hydraulic system receives the start-up order of the monitoring system hydraulic system and the start-up conditions are satisfied; The startup 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.

[0010] Preferably, the shutdown order and guide vane full closure refer to the governor hydraulic system receiving a shutdown order from the monitoring system hydraulic system and the turbine guide vanes being in the full closure position.

[0011] Beneficial effects of the present invention: 1. The present invention proposes all operating states of the hydraulic system of the turbine governor, including the shutdown standby state, the startup process state, the operating state, and the shutdown process state, and proposes the torsion conditions between the various operating states, which has wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a flowchart of the present invention. DETAILED DESCRIPTION

[0014] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0015] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0016] Embodiment 1: See also Figure 1 , a method for controlling the operating state of a hydraulic system of a turbine speed governor, comprising: Hydraulic system shutdown standby state: refers to the state where the isolation valve of the hydraulic system is in the closed position and the hydraulic system pressure oil tank is not connected to the system circuit; Hydraulic system startup process state: refers to the process in which the isolation valve position of the hydraulic system changes from the closed state to the open state; Hydraulic system operating state: refers to the state where the isolation valve of the hydraulic system is in the open position and the hydraulic system pressure oil tank is connected to the system circuit; Hydraulic system shutdown process state: refers to the process in which the isolation valve position of the hydraulic system changes from an open state to a closed state; The hydraulic system shutdown standby state can be converted into a hydraulic system startup process state, the hydraulic system startup process state can be converted into a hydraulic system operating state, and the hydraulic system operating state can be converted into a hydraulic system shutdown process state.

[0017] Furthermore, the torsion conditions of the hydraulic system in the shutdown standby state include: When the program is initialized or restarted after power failure, the isolation valve position feedback contact is judged. If it is closed, the machine enters the shutdown standby state; When the hydraulic system is in the shutdown process state, the isolation valve position feedback contact is judged. If it is closed, it enters the shutdown standby state.

[0018] Furthermore, the torsion conditions of the hydraulic system startup process state include: When the hydraulic system is in the shutdown standby state, if the hydraulic system receives a start-up command and the hydraulic system start-up conditions are met, it enters the start-up process state.

[0019] Furthermore, the torsion conditions of the hydraulic system operation state include: When the program is initialized or restarted after power failure, the isolation valve position feedback contact is judged. If it is open, the hydraulic system enters the operating state; When the hydraulic system is in the startup process state, the isolation valve position feedback contact is judged. If it is open, the hydraulic system enters the running state.

[0020] Furthermore, the torsion conditions of the hydraulic system shutdown process state include: When the hydraulic system is in operation, if the hydraulic system receives a shutdown command and the guide vanes are fully closed, it enters the shutdown process state.

[0021] Furthermore, the start-up order and the start-up conditions being met refer to the governor hydraulic system receiving the start-up order of the monitoring system hydraulic system and the start-up conditions being met; The startup 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.

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

Claims

1. A method for controlling the operating state of a hydraulic system of a turbine governor, characterized in that: include: Hydraulic system shutdown standby state: refers to the state where the isolation valve of the hydraulic system is in the closed position and the hydraulic system pressure oil tank is not connected to the system circuit; Hydraulic system startup process state: refers to the process in which the isolation valve position of the hydraulic system changes from the closed state to the open state; Hydraulic system operating state: refers to the state where the isolation valve of the hydraulic system is in the open position and the hydraulic system pressure oil tank is connected to the system circuit; Hydraulic system shutdown process state: refers to the process in which the isolation valve position of the hydraulic system changes from an open state to a closed state; The hydraulic system shutdown standby state can be converted into a hydraulic system startup process state, the hydraulic system startup process state can be converted into a hydraulic system operating state, and the hydraulic system operating state can be converted into a hydraulic system shutdown process state.

2. A method for controlling the operating state of a hydraulic system of a turbine governor according to claim 1, characterized in that: The torsion conditions of the hydraulic system shutdown standby state include: When the program is initialized or restarted after power failure, the isolation valve position feedback contact is judged. If it is closed, the machine enters the shutdown standby state; When the hydraulic system is in the shutdown process state, the isolation valve position feedback contact is judged. If it is closed, it enters the shutdown standby state.

3. The method for controlling the operating state of a hydraulic system of a turbine governor according to claim 1, characterized in that: The torsion conditions of the hydraulic system startup process include: When the hydraulic system is in the shutdown standby state, if the hydraulic system receives a start-up command and the hydraulic system start-up conditions are met, it enters the start-up process state.

4. The method for controlling the operating state of a hydraulic system of a turbine governor according to claim 1, characterized in that: The torsion conditions of the hydraulic system operation state include: When the program is initialized or restarted after power failure, the isolation valve position feedback contact is judged. If it is open, the hydraulic system enters the operating state; When the hydraulic system is in the startup process state, the isolation valve position feedback contact is judged. If it is open, the hydraulic system enters the running state.

5. The method for controlling the operating state of a hydraulic system of a turbine governor according to claim 1, characterized in that: The torsion conditions of the hydraulic system shutdown process state include: When the hydraulic system is in operation, if the hydraulic system receives a shutdown command and the guide vanes are fully closed, it enters the shutdown process state.

6. A method for controlling the operating state of a hydraulic system of a turbine speed governor according to claim 3, characterized in that: The start-up order and the start-up conditions are satisfied, which means that the governor hydraulic system receives the start-up order of the monitoring system hydraulic system and the start-up conditions are satisfied; The startup 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.

7. A method for controlling the operating state of a hydraulic system of a turbine governor according to claim 5, characterized in that: The shutdown order and guide vane fully closed refer to that the governor hydraulic system receives the shutdown order of the monitoring system hydraulic system and the turbine guide vanes are in the fully closed position.

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