Hydraulic system of water turbine governor
By designing a controller that integrates a PLC unit, a PID adjustment unit, a power amplification unit and a touch screen, combined with a hydraulic servo system and a hydraulic locking device, the adjustment accuracy and stability of the turbine adjustment system under complex operating conditions is solved, and efficient and accurate hydraulic system control is achieved.
Patent Information
- Application Number
- CN202421807367.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-29
AI Technical Summary
When the existing turbine adjustment system copes with complex working conditions, the adjustment accuracy is low and the stability is poor, making it difficult to meet the demands of modern power grids for power quality.
A hydraulic system of a turbine speed controller is designed, including a controller that is electrically connected to each other by the PLC unit, a PID adjustment unit, a power amplification unit and a touch screen. The controller is electrically connected to the hydraulic servo system, and the hydraulic servo system is connected to the hydraulic station and the hydraulic locking device. When the unit is shut down, the controller controls the hydraulic servo system to drive the hydraulic locking device to lock the guide vane in a fully closed position.
A hydraulic system with fast response, high adjustment performance and high control accuracy is realized to ensure that the guide vane is safely locked when the unit is shut down and avoid accidental opening.
Smart Images
Figure CN223018793U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hydraulic control, and relates to a hydraulic system for a water turbine governor. Background Technique
[0002] The water turbine regulating system is an important part of a hydropower station, responsible for regulating the speed and output power of the water turbine to meet the needs of the power grid. However, existing water turbine regulating systems often have problems such as low regulation accuracy and poor stability when dealing with complex working conditions, which affect the operating efficiency and economic benefits of hydropower stations. In particular, there are still a large number of small hydropower stations in China. Most of these early-built hydropower stations use mechanical hydraulic governors or electric speed control mechanisms with a rated oil pressure of 2.5 MPa, which have slow response, low regulation performance and poor control accuracy, and are difficult to meet the requirements of modern power grids for power quality. Summary of the Invention
[0003] The technical problem to be solved by the utility model is to provide a hydraulic system for a water turbine governor, which is used to lock the guide vane in the fully closed position when the unit is in the shutdown state.
[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a hydraulic system for a water turbine governor, which includes a controller integrally formed by electrically connecting a PLC unit, a PID adjustment unit, a power amplification unit and a touch screen; the controller is electrically connected to a hydraulic servo system, and the hydraulic servo system is connected to a hydraulic station and a hydraulic locking device; in the shutdown state of the unit, the controller controls the hydraulic servo system to drive the hydraulic locking device to lock the guide vane in the fully closed position.
[0005] The hydraulic locking device includes an electromagnetic valve and a hydraulic lock connected by a high-pressure hose; the electromagnetic valve and the hydraulic lock are electrically connected to the hydraulic servo system.
[0006] The PLC unit collects the unit frequency, grid frequency, generator breaker position and control signals from the upper computer.
[0007] The PID adjustment unit analyzes, judges and calculates the control signals according to the PID control law, and the output result is amplified by the power amplification unit and then sent to the hydraulic servo system.
[0008] The controller receives the fault signal of the hydraulic servo system and feeds back the fault signal to the background system.
[0009] The main beneficial effects of the utility model are as follows:
[0010] Connect the hydraulic servo system through the controller. The hydraulic servo system is connected to the hydraulic station and the hydraulic locking device. The PLC unit collects control signals, and the PID adjustment unit analyzes, judges, and calculates the control signals. The output result is amplified by the power amplification unit and then sent to the hydraulic servo system. The hydraulic servo system drives the hydraulic locking device to lock the guide vane in the fully closed position, with fast response, high adjustment performance, and high control accuracy.
[0011] The high-pressure hose reduces the negative impact of pressure pulsation in the system on the solenoid valve and the hydraulic lock.
[0012] The solenoid valve and the hydraulic lock lock the guide vane in the fully closed position when the unit is in the shutdown state to prevent accidental opening. Brief Description of the Drawings
[0013] The following further describes the present invention in conjunction with the drawings and embodiments.
[0014] Figure 1 It is a structural schematic diagram of the present invention.
[0015] In the figure: PLC unit 1; PID adjustment unit 2; power amplification unit 3; touch screen 4; controller 5; hydraulic servo system 6; hydraulic station 7; high-pressure hose 81; solenoid valve 82; hydraulic lock 83. Detailed Embodiments
[0016] As Figure 1 In, a hydraulic system for a water turbine governor includes a controller 5 integrally formed by electrically connecting a PLC unit 1, a PID adjustment unit 2, a power amplification unit 3, and a touch screen 4; the controller 5 is electrically connected to the hydraulic servo system 6, and the hydraulic servo system 6 is connected to the hydraulic station 7 and the hydraulic locking device; in the shutdown state of the unit, the controller 5 controls the hydraulic servo system 6 to drive the hydraulic locking device to lock the guide vane in the fully closed position. Connect the hydraulic servo system 6 through the controller 5. The hydraulic servo system 6 is connected to the hydraulic station 7 and the hydraulic locking device. The PLC unit 1 collects control signals, and the PID adjustment unit 2 analyzes, judges, and calculates the control signals. The output result is amplified by the power amplification unit 3 and then sent to the hydraulic servo system 6. The hydraulic servo system 6 drives the hydraulic locking device to lock the guide vane in the fully closed position, with fast response, high adjustment performance, and high control accuracy.
[0017] Preferably, the hydraulic station 7 is used to provide the high-pressure oil required by the hydraulic servo system 6.
[0018] In a preferred solution, the hydraulic locking device includes a solenoid valve 82 and a hydraulic lock 83 connected by a high-pressure hose 81; the solenoid valve 82 and the hydraulic lock 83 are electrically connected to the hydraulic servo system 6. During use, the high-pressure hose 81 reduces the negative impact of pressure pulsation in the system on the solenoid valve 82 and the hydraulic lock 83.
[0019] Preferably, the solenoid valve 82 and the hydraulic lock 83 lock the guide vane in the fully closed position when the unit is shut down to prevent accidental opening.
[0020] In a preferred solution, the PLC unit 1 collects the unit frequency, grid frequency, generator breaker position, and control signals from the upper computer. During use, the PLC controls the small fluctuation electromagnetic proportional valve in the unit to perform continuously adjustable small flow operations to achieve small fluctuations in fine tuning according to the magnitude of the frequency change, or controls the large fluctuation electromagnet in the unit to perform large flow operations for rapid and large-scale adjustment.
[0021] In a preferred solution, the PID adjustment unit 2 analyzes, judges, and calculates the control signals according to the PID control law, and the output result is amplified by the power amplification unit 3 and then sent to the hydraulic servo system 6.
[0022] In a preferred solution, the controller 5 receives the fault signal of the hydraulic servo system 6 and feeds back the fault signal to the background system.
[0023] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The embodiments in this application and the features in the embodiments can be arbitrarily combined with each other without conflict. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.
Claims
1. A hydraulic system for a turbine speed governor, characterized in that: It comprises a controller (5) which is electrically connected to an integrated PLC unit (1), a PID adjustment unit (2), a power amplification unit (3) and a touch screen (4); the controller (5) is electrically connected to a hydraulic servo system (6), and the hydraulic servo system (6) is connected to a hydraulic station (7) and a hydraulic locking device; when the unit is in a shutdown state, the controller (5) controls the hydraulic servo system (6) to drive the hydraulic locking device to lock the guide vane in a fully closed position.
2. The hydraulic system of the turbine speed governor according to claim 1, characterized in that: The hydraulic locking device comprises a solenoid valve (82) and a hydraulic lock (83) connected by a high-pressure hose (81); the solenoid valve (82) and the hydraulic lock (83) are electrically connected to the hydraulic servo system (6).
3. The hydraulic system of the turbine speed governor according to claim 1 is characterized in that: The PLC unit (1) collects the unit frequency, the grid frequency, the generator circuit breaker position and the control signal of the host computer.
4. The hydraulic system of the turbine speed governor according to claim 1 is characterized in that: The PID adjustment unit (2) analyzes, judges and calculates the control signal according to the PID control law, and the output result is amplified by the power amplifier unit (3) and then sent to the hydraulic servo system (6).
5. The hydraulic system of the turbine speed governor according to claim 1, characterized in that: The controller (5) receives a fault signal from the hydraulic servo system (6), and feeds the fault signal back to the background system.