Power closed-loop control method and system in opening mode of water turbine governor

Abstract

The invention relates to the technical field of hydroelectric energy, and the method comprises the steps that a two-stage starting mode is adopted, an opening limit self-adaption function is configured, the starting opening degree of a speed regulator is set according to single machine operation, the speed regulator influences the load of another machine by adopting power mode closed-loop control, power is added to a global variable for memory, and the speed regulator is controlled to be in a closed-loop mode. The method is used for the stable load function condition of the speed regulator in the opening mode, automatic switching is achieved through the opening mode when a power part breaks down, and a unit operates stably. According to the method, the load fluctuation of the speed regulator under one-hole double-machine disturbance can be reduced, and the unit overload phenomenon caused by the abnormal working state of the unit is reduced. The automatic load adjusting capacity and reliability of the unit in operation are improved, and the situation that the unit is damaged due to non-planned shutdown caused by unit overload is prevented. And the phenomena of overload and slip load caused by hydraulic fluctuation and excessive active power disturbance of the unit in unit load regulation are prevented.

Description

Technical Field

[0001] This invention relates to the field of hydropower energy technology, and in particular to a power closed-loop control method and system for a turbine governor in the opening mode. Background Technology

[0002] The Dahua Hydropower Station features a long water diversion tunnel (5.6 km) and a "one tunnel, two units" configuration with a surge tank. When one unit adjusts its load or starts / stops, the other unit experiences significant load fluctuations due to sudden changes in spiral casing pressure, even with the guide vane opening remaining constant. In open-circuit mode, load adjustments affect the other unit, causing it to operate at full load (100MW). When the other unit operates at full load, the load exceeds the rated load by 20%. The project team independently developed a governor power closed-loop control program, enabling the governor to continuously track and monitor the system's set active load in open-circuit mode. This effectively solves the power disturbance problem caused by spiral casing hydraulic fluctuations in both power and open-circuit modes. After successful development and implementation, the power fluctuation caused by spiral casing pressure changes during governor operation is less than 3% of the rated load, significantly improving unit operational reliability and effectively preventing unit overload. Summary of the Invention

[0003] In view of the aforementioned existing problems, the present invention is proposed.

[0004] Therefore, this invention provides a power closed-loop control method under the turbine governor opening mode, which has excellent implications and reference value for power generation companies. It can significantly improve the stability of unit power regulation and reduce the impact on the power system.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a power closed-loop control method for a turbine governor in the opening mode, comprising: adopting a two-stage start-up mode and configuring an adaptive opening limit function; the governor start-up opening degree is set according to the single-unit operation; the governor affects the load of another unit by adopting power mode closed-loop control to generate a power mode control strategy; adding power supply memory to the global variables for load stabilization function conditions in the governor opening mode; and achieving automatic switching when a power section fault occurs through the opening mode to ensure stable unit operation.

[0006] As a preferred embodiment of the power closed-loop control method in the turbine governor opening mode described in this invention, the two-stage start-up mode includes: setting the initial opening and opening rate of the two-stage start-up mode according to the characteristics and operating conditions of the turbine; starting the turbine governor to enter the two-stage start-up mode; and when the governor receives the start-up command, opening the guide vanes to the first start-up opening Y at a certain speed. KJ1 Guide vanes open to Y KJ1Then, the second boot-up process begins.

[0007] As a preferred embodiment of the power closed-loop control method under the turbine governor opening mode described in this invention, the opening limit adaptive function includes: extending the start-up process according to the actual start-up requirements of the unit to meet the requirements of smooth transition; during the process of adjusting the load on another unit, the start-up speed determines the PID adjustment rate to reduce the oscillation process; when the turbine generator unit starts up and enters the transition stage, the governor will automatically adjust the opening degree according to the difference between the real-time power output of the turbine generator unit and the predetermined power; the opening limit adaptive function continuously optimizes the parameters so that the output power of the generator unit reaches the predetermined value.

[0008] Once the output power of the hydro-generator unit reaches the preset value, it enters the stable operation stage. The opening limit adaptive function continuously monitors the operating status of the hydro-generator unit and adjusts the opening degree in real time according to the actual load changes to ensure the stable operation of the generator unit under different loads.

[0009] When a fault occurs during the operation of the hydro-generator unit, the opening limit adaptive function reacts quickly and takes protective measures such as reducing the opening degree and shutting down the unit to prevent the fault from escalating.

[0010] After the hydro-generator unit finishes operation and enters the shutdown phase, the open limit adaptive function assists the speed governor in power closed-loop control, gradually reducing the opening degree until the generator unit completely stops operating.

[0011] As a preferred embodiment of the power closed-loop control method in the turbine governor opening mode described in this invention, the power mode closed-loop control includes: the governor adopts power mode closed-loop control, and the power mode closed-loop control affects the load of another unit during load adjustment, start-up and shutdown operations, and load shedding operations.

[0012]

[0013] Where, k P k I k D Let y be the proportional, differential, and integral gain, s be the Laplace operator, and y be the integral gain. PlD To adjust the output, T 1v This is the reaction time constant of the auxiliary relay.

[0014] As a preferred embodiment of the power closed-loop control method in the turbine governor opening mode described in this invention, the power mode control strategy includes: the core control logic is PID algorithm control; when a difference is detected between the power feedback and the power setpoint, the control adjustment value is quickly output after proportional and integral calculations based on the difference comparison; in power mode, a dedicated power PID control loop is engaged; the operating unit monitors load fluctuations in real time; after setting the power dead zone in the human-machine interface, once the power fluctuation exceeds the dead zone, the power response rate quickly activates the guide vanes according to the PID parameter settings; the power PID parameters are set in two sets according to the Dahua Hydropower Station; when receiving the monitored power setpoint normally, the conventional power PID parameters are used; when the monitored power setpoint does not change, if the load exceeds the set value, the system immediately switches to the power fluctuation PID parameters.

[0015] As a preferred embodiment of the power closed-loop control method in the turbine governor opening mode described in this invention, the global variable adding power supply memory includes adding a memory mode and a power setpoint memory program segment. The actual power is compared with the set power target value to obtain the power deviation. The power deviation is used as an input signal and applied to the power closed-loop control algorithm. The power setpoint in the power mode is changed. When in memory mode, the memory power supply is used. When in memory mode, islanded PID is used. The memory mode is equivalent to the islanded mode. According to the power deviation and the adjustment of the power supply memory, the corresponding opening command is calculated, and the opening of the turbine guide vanes is adjusted according to the calculated opening command.

[0016] As a preferred embodiment of the power closed-loop control method in the turbine governor opening mode described in this invention, the opening mode includes: adding an opening mode adjustment completion command to the governor in the LCU of Unit 1; used for the governor to remember the actual power value collected by the governor after the load adjustment of the monitoring system is completed in the opening mode as the governor's stable power tracking value; the dead zone value of the active power difference adjustment in the monitoring system opening mode to prevent load slippage and overload needs to be confirmed in combination with test data;

[0017] After the monitoring system's opening mode adjustment is completed, when the load stabilization function condition for the speed controller's opening mode is increased without a secondary frequency regulation command, the speed controller automatically assigns the currently collected actual generated power as the power setpoint to the speed controller, realizing the speed controller's power closed loop. After the primary frequency regulation action, the speed controller's power setpoint is the actual power feedback value of the speed controller after the monitoring system's opening mode adjustment is completed.

[0018] Another objective of this invention is to provide a system for closed-loop power control under the turbine governor opening mode. This system can solve the problem of dual turbines in one tunnel at the Dahua Hydropower Station by using the governor PID control algorithm and the governor power closed-loop regulation function. This effectively reduces load changes during unit load adjustment, improves power stability and other indicators, and ensures stable unit operation.

[0019] A system for closed-loop power control in the opening mode of a turbine governor is characterized by comprising a power setting module, a sensor and measurement module, an opening command calculation module, an operating status monitoring module, a closed-loop control module, and an optimization and adjustment module.

[0020] The power setting module sets the target power value of the turbine governor according to the grid load demand and the operating status of the hydropower plant generator set. The target value is adjusted as the grid load changes to ensure the stable operation of the power system.

[0021] The sensors and measurement module monitor the actual operating parameters of the turbine and calculate the actual power through the sensors and measurement devices;

[0022] The opening command calculation module calculates the corresponding opening command based on the power deviation, which is used to adjust the opening of the turbine guide vanes.

[0023] The operation status monitoring module monitors the operation status of the turbine throughout the adjustment process, ensuring that the turbine remains within a stable operating range while meeting the grid load requirements.

[0024] The closed-loop control module integrates the above modules to form a closed-loop control system, realizing power closed-loop control in the turbine opening mode.

[0025] The optimization and adjustment module optimizes and adjusts the control algorithm based on factors such as the type of water turbine and the characteristics of the power grid load, in order to improve control accuracy and stability.

[0026] A computer device includes a memory and a processor, the memory storing a computer program, characterized in that the processor executes the computer program to implement the steps of a power closed-loop control method in the opening mode of a water turbine governor.

[0027] A computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of a power closed-loop control method in the opening mode of a water turbine governor.

[0028] The beneficial effects of this invention are as follows: By reducing load fluctuations of the speed governor under dual-unit disturbance conditions, this method can significantly reduce unit overload caused by abnormal operating states. It enhances the unit's automatic load adjustment capability and reliability during operation, preventing unplanned shutdowns and damage to the unit due to overload. It also prevents overload and load slippage caused by excessive hydraulic fluctuations and active power disturbances during unit load regulation. Overload can cause insulation materials to become brittle, increase dielectric damage, reduce withstand breakdown voltage, and increase spindle torque, thus ensuring the safety of the unit and the power plant. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0030] Figure 1 This is a schematic diagram of a power closed-loop control method in the opening mode of a water turbine governor, provided by an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of the operation mode of a power closed-loop control method under the opening mode of a turbine governor, provided as an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a power mode control strategy for a power closed-loop control method in the opening mode of a turbine governor, provided as an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of an interference test of two turbines in a tunnel under the power mode operation of a power closed-loop control method in the opening mode of a turbine governor, provided as an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of an interference test of a turbine governor operating in the power closed-loop control mode under the opening mode of a turbine, provided as an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the working process of a power closed-loop control system in the opening mode of a turbine governor, provided as an embodiment of the present invention. Detailed Implementation

[0036] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0039] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0040] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Example 1

[0043] Reference Figures 1-3This is the first embodiment of the present invention, which provides a power closed-loop control method in the turbine governor opening mode, including:

[0044] S1: It adopts a two-stage start-up mode and is equipped with an adaptive start-up limit function. The start-up opening degree of the speed controller is set according to the single-machine operation.

[0045] Furthermore, the two-stage start-up mode includes setting the initial opening degree and the rate of change of the opening degree according to the characteristics and operating conditions of the turbine, starting the turbine governor, and entering the two-stage start-up mode. When the governor receives the start-up command, it opens the guide vanes to the first start-up opening degree Y at a certain speed. KJ1 Guide vanes open to Y KJ1 Then, the second boot-up process begins.

[0046] It should be noted that the adaptive opening limit function includes extending the start-up process according to the actual start-up requirements of the unit to meet the requirements of smooth transition. During the load adjustment process of another unit, the start-up speed determines the adjustment rate of the PID to reduce the oscillation process. After the hydro-generator unit starts up, it enters the transition stage. The governor will automatically adjust the opening degree according to the difference between the real-time power output of the hydro-generator unit and the predetermined power. The adaptive opening limit function continuously optimizes the parameters so that the output power of the generator unit reaches the predetermined value.

[0047] Furthermore, once the output power of the hydro-generator unit reaches the preset value, it enters the stable operation stage. The opening limit adaptive function continuously monitors the operating status of the hydro-generator unit and adjusts the opening degree in real time according to the actual load changes to ensure the stable operation of the generator unit under different loads.

[0048] When a fault occurs during the operation of the hydro-generator unit, the opening limit adaptive function reacts quickly and takes protective measures such as reducing the opening degree and shutting down the unit to prevent the fault from escalating.

[0049] After the hydro-generator unit finishes operation and enters the shutdown phase, the open limit adaptive function assists the speed governor in power closed-loop control, gradually reducing the opening degree until the generator unit completely stops operating.

[0050] S2: The speed controller affects the load of another machine by adopting power mode closed-loop control, thus generating a power mode control strategy.

[0051] Furthermore, the power mode closed-loop control includes the speed controller employing power mode closed-loop control, which addresses the impact of load adjustment, start-up / stop operations, and load shedding operations on the load of another machine.

[0052]

[0053] Where, kP k I k D Let y be the proportional, differential, and integral gain, s be the Laplace operator, and y be the integral gain. PlD To adjust the output, T 1ν This is the reaction time constant of the auxiliary relay.

[0054] Proportional term: Y p (k)=K p ·DF(k)

[0055] Integral term: Y I (k)=Y I (k-1)+ΔY I (k)

[0056] Differential term:

[0057] It should be noted that the power mode can be automatically selected upon startup, or it can be entered via the LCU power mode switch signal. In the event of a power failure, it will automatically switch to the open mode to ensure stable operation of the unit.

[0058] Furthermore, the power mode control strategy includes a core control logic of PID algorithm control. When a difference is detected between the power feedback and the power setpoint, the control adjustment value is quickly output after proportional and integral calculations based on the difference comparison. In power mode, a dedicated power PID control loop is engaged, and the operating unit monitors load fluctuations in real time. After setting the power dead zone in the human-machine interface, once the power fluctuation exceeds the dead zone, the power response rate quickly activates the guide vanes according to the PID parameter settings. The power PID parameters are set in two sets according to the Dahua Hydropower Station. Normally, when receiving the monitored power setpoint, the conventional power PID parameters are used. When the monitored power setpoint does not change, if the load exceeds the set value, the system immediately switches to the power fluctuation PID parameters.

[0059] S3: Add power supply memory to the global variables for load stabilization function conditions in governor opening mode.

[0060] Furthermore, the addition of power supply memory to the global variable includes adding a memory mode and a power setpoint memory program segment. The actual power is compared with the set power target value to obtain the power deviation. The power deviation is used as an input signal and applied to the power closed-loop control algorithm. The power setpoint in the power mode is changed. When in memory mode, the memory power supply is used. When in memory mode, islanded PID is used. The memory mode is equivalent to the islanded mode. Based on the adjustment of the power deviation and power supply memory, the corresponding opening command is calculated, and the opening of the turbine guide vanes is adjusted according to the calculated opening command.

[0061] S4: Automatic switching is achieved through the opening mode when a power section failure occurs, so as to ensure stable operation of the unit.

[0062] Furthermore, the opening mode includes adding an opening mode adjustment completion command to the speed governor in the LCU of Unit 1. This is used for the speed governor to memorize the actual power value collected by the speed governor after the load adjustment of the monitoring system is completed in the opening mode, and use it as the stable power tracking value of the speed governor. The dead zone value of the active power difference adjustment of the monitoring system to prevent load slippage and overload needs to be confirmed in combination with test data.

[0063] After the monitoring system's opening mode adjustment is completed, when the load stabilization function condition for the speed controller's opening mode is increased without a secondary frequency regulation command, the speed controller automatically assigns the currently collected actual generated power as the power setpoint to the speed controller, realizing the speed controller's power closed loop. After the primary frequency regulation action, the speed controller's power setpoint is the actual power feedback value of the speed controller after the monitoring system's opening mode adjustment is completed.

[0064] Example 2

[0065] Reference Figure 4 and Figure 5 As an embodiment of the present invention, a power closed-loop control method is provided in the turbine governor opening mode. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0066] A load stabilization test of two turbines in one tunnel was conducted at the Dahua Hydropower Station.

[0067] 1. Interference test of dual machines in the next tunnel under power mode operation

[0068] Unit 1 operated at a stable load of 80MW in power mode. Unit 2 increased its load directly from 0MW to 100MW. During this process, the active power deviation of Unit 1 ranged from 82.17MW to 80.08MW, with a positive and negative deviation of 2.09MW. During the shutdown process of Unit 2, the maximum load fluctuation was 83.23MW. The initial guide vane opening was 79.08%, and the subsequent opening was 66.66%. The initial volute pressure was 1.35MPa, and the maximum volute pressure during the adjustment process was 1.28MPa. The active power fluctuation rate was 2.09%, a reduction of 17.91% compared to the highest power fluctuation of 20% before the implementation of the dual-unit project. This significantly improved the governor's resistance to volute pressure fluctuations during operation.

[0069] 2. Interference test of dual machines in the next tunnel under open-circuit mode.

[0070] Unit 1 operated at a stable load of 80MW in open mode. Unit 2 dropped directly from 100MW to 0MW. During this process, the active power deviation of Unit 1 ranged from 82.19MW to 80.08MW, with a positive and negative deviation of 2.11MW. During the shutdown of Unit 2, the maximum load fluctuation was 83.23MW. The initial guide vane opening was 73.22%, and the subsequent opening was 66.66%. The initial volute pressure was 1.32MPa, and the maximum volute pressure during adjustment was 1.39MPa. The active power fluctuation rate was 2.11%, a reduction of 17.89% compared to the highest power fluctuation of 20% before the implementation of the dual-unit project. This significantly improved the governor's resistance to volute pressure fluctuations during operation.

[0071] 3. Analysis Conclusion

[0072] Comparing items 1 and 2, it can be observed that the load stability performance of the dual units in the single-unit tunnel under both power mode and opening mode of the speed governor meets the specified requirements, with an active power fluctuation rate of approximately 2%. Before the upgrade, load fluctuations due to interference could reach 20MW. Data comparison shows that the upgraded monitoring system's load regulation stability performance is far superior to that before the upgrade, significantly improving the speed governor's regulation performance and ensuring the safe and stable operation of the units.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0074] Example 3

[0075] The third embodiment of the present invention differs from the first two embodiments in that:

[0076] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0077] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0078] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0079] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0080] Example 4

[0081] Reference Figure 6 As an embodiment of the present invention, a system for power closed-loop control in the opening mode of a turbine governor is provided, characterized in that it includes a power setting module, a sensor and measurement module, an opening command calculation module, an operating status monitoring module, a closed-loop control module, and an optimization and adjustment module.

[0082] The power setting module sets the target power value of the turbine governor based on the grid load demand and the operating status of the hydropower plant generator units. The target value is adjusted as the grid load changes to ensure the stable operation of the power system.

[0083] Sensors and measurement modules monitor the actual operating parameters of the turbine and calculate the actual power output.

[0084] The opening command calculation module calculates the corresponding opening command based on the power deviation, which is used to adjust the opening of the turbine guide vanes.

[0085] The operation status monitoring module monitors the turbine's operating status throughout the adjustment process, ensuring that the turbine remains within a stable operating range while meeting the grid load requirements.

[0086] The closed-loop control module integrates the above modules to form a closed-loop control system, realizing power closed-loop control in the turbine opening mode.

[0087] The optimization and adjustment module optimizes and adjusts the control algorithm based on factors such as the type of water turbine and the characteristics of the power grid load, in order to improve control accuracy and stability.

[0088] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A closed-loop power control method for a turbine governor in operating mode, characterized in that: include, It adopts a two-stage start-up mode and is equipped with an adaptive start-up limit function. The start-up opening degree of the speed controller is set according to the single-machine operation. The speed controller influences the load of another machine by employing power-mode closed-loop control, thereby generating a power-mode control strategy. Add power supply memory to the global variable to stabilize the load function condition in governor opening mode; The open-end mode enables automatic switching when a power section failure occurs, ensuring stable operation of the unit.

2. The power closed-loop control method in the turbine governor opening mode as described in claim 1, characterized in that: The two-stage start-up mode includes setting the initial opening degree and the rate of change of the opening degree according to the characteristics and operating conditions of the turbine, starting the turbine governor, and entering the two-stage start-up mode. When the governor receives the start-up command, it opens the guide vanes to the first start-up opening degree Y at a certain speed. KJ1 Guide vanes open to Y KJ1 Then, the second boot-up process begins.

3. The power closed-loop control method in the turbine governor opening mode as described in claim 2, characterized in that: The adaptive opening limit function includes extending the start-up process according to the actual start-up requirements of the unit to meet the requirements of smooth transition. During the load adjustment process of another unit, the start-up speed determines the adjustment rate of the PID to reduce the oscillation process. After the hydro-generator unit starts up and enters the transition stage, the speed governor will automatically adjust the opening degree according to the difference between the real-time power output of the hydro-generator unit and the predetermined power. The adaptive opening limit function continuously optimizes the parameters so that the output power of the generator unit reaches the predetermined value. Once the output power of the hydro-generator unit reaches the preset value, it enters the stable operation stage. The opening limit adaptive function continuously monitors the operating status of the hydro-generator unit and adjusts the opening degree in real time according to the actual load changes to ensure the stable operation of the generator unit under different loads. When a fault occurs during the operation of the hydro-generator unit, the opening limit adaptive function reacts quickly and takes protective measures such as reducing the opening degree and shutting down the unit to prevent the fault from escalating. After the hydro-generator unit finishes operation and enters the shutdown phase, the open limit adaptive function assists the speed governor in power closed-loop control, gradually reducing the opening degree until the generator unit completely stops operating.

4. The power closed-loop control method of the turbine governor opening mode as described in claim 3, characterized in that: The power mode closed-loop control includes the speed controller employing power mode closed-loop control, which addresses the impact of load adjustment, start-up / stop operations, and load shedding operations on the load of another unit. Where, k P k I k D Let y be the proportional, differential, and integral gain, s be the Laplace operator, and y be the integral gain. PlD To adjust the output, T 1ν This is the reaction time constant of the auxiliary relay.

5. The power closed-loop control method in the turbine governor opening mode as described in claim 4, characterized in that: The power mode control strategy includes a core control logic of PID algorithm control. When a difference is detected between the power feedback and the power setpoint, the control adjustment value is quickly output after proportional and integral calculations based on the difference comparison. In power mode, a dedicated power PID control loop is engaged, and the operating unit monitors load fluctuations in real time. After setting the power dead zone on the human-machine interface, once the power fluctuation exceeds the dead zone, the power response rate quickly activates the guide vanes according to the PID parameter settings. The power PID parameters are set in two sets according to the Dahua Hydropower Station. Normally, when receiving the monitored power setpoint, the conventional power PID parameters are used. When the monitored power setpoint does not change, if the load exceeds the set value, the system immediately switches to the power fluctuation PID parameters.

6. The power closed-loop control method in the turbine governor opening mode as described in claim 5, characterized in that: The addition of power supply memory to the global variable includes adding a memory mode and a power setpoint memory program segment. The actual power is compared with the set power target value to obtain the power deviation. The power deviation is used as an input signal and applied to the power closed-loop control algorithm. The power setpoint in the power mode is changed. When in memory mode, the memory power supply is used. When in memory mode, islanded PID is used. The memory mode is equivalent to the islanded mode. Based on the power deviation and the adjustment of the power supply memory, the corresponding opening command is calculated, and the opening of the turbine guide vanes is adjusted according to the calculated opening command.

7. The power closed-loop control method in the turbine governor opening mode as described in claim 6, characterized in that: The opening mode includes adding an opening mode adjustment completion command to the speed governor in the LCU of Unit 1; the speed governor is used in the opening mode to memorize the actual power value collected by the speed governor after the load adjustment of the monitoring system is completed as the stable power tracking value of the speed governor. The dead zone value of the active power difference adjustment of the monitoring system opening mode to prevent load slippage and overload needs to be confirmed in combination with test data. After the monitoring system's opening mode adjustment is completed, when the load stabilization function condition for the speed controller's opening mode is increased without a secondary frequency regulation command, the speed controller automatically assigns the currently collected actual generated power as the power setpoint to the speed controller, realizing the speed controller's power closed loop. After the primary frequency regulation action, the speed controller's power setpoint is the actual power feedback value of the speed controller after the monitoring system's opening mode adjustment is completed.

8. A system employing a power closed-loop control method in the turbine governor opening mode as described in any one of claims 1 to 7, characterized in that: It includes a power setting module, a sensor and measurement module, an opening command calculation module, an operation status monitoring module, a closed-loop control module, and an optimization and adjustment module; The power setting module sets the target power value of the turbine governor according to the grid load demand and the operating status of the hydropower plant generator set. The target value is adjusted as the grid load changes to ensure the stable operation of the power system. The sensors and measurement module monitor the actual operating parameters of the turbine and calculate the actual power through the sensors and measurement devices; The opening command calculation module calculates the corresponding opening command based on the power deviation, which is used to adjust the opening of the turbine guide vanes. The operation status monitoring module monitors the operation status of the turbine throughout the adjustment process, ensuring that the turbine remains within a stable operating range while meeting the grid load requirements. The closed-loop control module integrates the above modules to form a closed-loop control system, realizing power closed-loop control in the turbine opening mode. The optimization and adjustment module optimizes and adjusts the control algorithm based on factors such as the type of water turbine and the characteristics of the power grid load, in order to improve control accuracy and stability.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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