Control method, system, computer device and computer-readable storage medium for AC excitation variable-speed pumped storage unit

Abstract

The present application relates to a control method, system, computer device, computer-readable storage medium, and computer program product for an AC-excited variable-speed pumped-storage unit, and relates to the technical field of pumped-storage unit control. The method comprises: controlling a speed regulating module to execute a guide vane zero-opening instruction and controlling an AC excitation module to execute a stator-end zero-output power instruction through a main control module; issuing a first disconnection instruction to a generator circuit breaker through the AC excitation module based on the execution of the stator-end zero-output power instruction; issuing a second disconnection instruction to a generator circuit breaker through the main control module based on the execution of the guide vane zero-opening instruction or the unit output power of the AC-excited variable-speed pumped-storage unit; the generator circuit breaker is configured to execute a disconnection operation in response to the first disconnection instruction and the second disconnection instruction; and when the generator circuit breaker is disconnected, controlling the control system to enter a standby state through the main control module. The present method can improve the stability of the power system.

Description

Technical Field

[0001] The present application relates to the technical field of pumped storage unit control, and in particular to a control method, system, computer equipment, computer-readable storage medium, and computer program product for an AC-excited variable-speed pumped storage unit. Background Art

[0002] Pumped-storage hydropower units play a vital role in emerging power systems with a high penetration of renewable energy. For fixed-speed pumped-storage units, when idle shutdown occurs, although no active power is transmitted, the unit still maintains speed, the pump-turbine continues to churn, and input power continues to flow to the generator motor output. This can cause current to flow when the generator circuit breaker opens, leading to arcing. This increases electrical wear and fault risk, reducing power system stability. Summary of the Invention

[0003] Based on this, it is necessary to address the technical problem of low stability of the above-mentioned power system and provide a control method, system, computer equipment, computer-readable storage medium and computer program product for an AC-excited variable-speed pumped storage unit that can improve the stability of the power system.

[0004] In a first aspect, the present application provides a control method for an AC excitation variable speed pumped storage unit, which is applied to a control system of an AC excitation variable speed pumped storage unit, the control system including a main control module, a speed regulation module, and an AC excitation module, the method comprising:

[0005] When the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop state, the speed regulating module is controlled to execute the guide vane zero opening instruction, and the AC excitation module is controlled to execute the stator end zero output power instruction;

[0006] According to the execution of the stator-end zero output power instruction, a first disconnection instruction is issued to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit through the AC excitation module;

[0007] According to the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, a second disconnection instruction is issued to the generator circuit breaker through the main control module; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction;

[0008] When it is detected that the generator circuit breaker is disconnected, the control system is controlled to enter a standby state through the main control module.

[0009] In one embodiment, controlling the speed regulating module to execute the guide vane zero opening instruction and controlling the AC excitation module to execute the stator end zero output power instruction through the main control module includes:

[0010] The main control module issues a pump stop control instruction to the cooperative control module in the control system, so that the cooperative control module controls the speed regulating module to enter the opening control mode and issues the guide vane zero opening instruction to the speed regulating module, and controls the AC excitation module to enter the speed control mode and issues the stator end zero output power instruction to the AC excitation module;

[0011] Executing the guide vane zero opening instruction through the speed regulating module in the opening control mode;

[0012] When it is detected that the speed regulation module has completed executing the guide vane zero opening instruction, the coordinated control module controls the AC excitation module to enter a power control mode;

[0013] The stator-end zero output power instruction is executed by the AC excitation module in the power control mode.

[0014] In one embodiment, the main control module sends a pump stop control instruction to the cooperative control module in the control system, so that the cooperative control module controls the speed regulation module to enter the opening control mode and sends the guide vane zero opening instruction to the speed regulation module, and controls the AC excitation module to enter the speed control mode and sends the stator end zero output power instruction to the AC excitation module, including:

[0015] The main control module issues a pump-stop control instruction to the collaborative control module; the collaborative control module is configured to, in response to the pump-stop control instruction, stop the operation optimization calculation for the AC excitation variable speed pumped storage unit and set the instruction enable signal of the collaborative control module to a valid enable value;

[0016] By means of the collaborative control module whose corresponding instruction enable signal is the effective enable value, the speed regulating module is controlled to enter the opening control mode and the guide vane zero opening instruction is issued to the speed regulating module; and the AC excitation module is controlled to enter the speed control mode and the stator end zero output power instruction is issued to the AC excitation module;

[0017] Among them, the speed regulation module is used to execute the guide vane zero opening instruction when the guide vane zero opening instruction is issued by the collaborative control module when the instruction enable signal is the effective enable value; the AC excitation module is used to execute the stator end zero output power instruction when the stator end zero output power instruction is issued by the collaborative control module when the instruction enable signal is the effective enable value.

[0018] In one embodiment, the execution status of the stator-end zero output power instruction at least includes the completion status of the execution of the stator-end zero output power instruction;

[0019] The step of issuing a first disconnection instruction to a generator circuit breaker of the AC excitation variable speed pumped storage generator set through the AC excitation module according to the execution of the stator-end zero output power instruction includes:

[0020] When it is detected that the stator-end output power of the AC excitation variable-speed pumped storage generator set is reduced to zero power, determining that the stator-end zero output power instruction has been executed;

[0021] When the stator-end zero output power instruction is executed, the first disconnection instruction is sent to the generator circuit breaker through the AC excitation module.

[0022] In one embodiment, the execution status of the guide vane zero opening instruction at least includes the completion status of the execution of the guide vane zero opening instruction;

[0023] The method of issuing a second disconnection instruction to the generator circuit breaker through the main control module according to the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit includes:

[0024] When it is detected that the guide vane opening of the AC excitation variable speed pumped storage unit is reduced to a preset guide vane opening, determining that the guide vane zero opening instruction has been executed;

[0025] After the guide vane zero opening instruction is executed for a preset time period or when the unit output power is less than a preset power, the second disconnection instruction is sent to the generator circuit breaker through the main control module.

[0026] In one embodiment, controlling the control system to enter a standby state through the main control module includes:

[0027] Controlling the collaborative control module in the control system to enter a shutdown mode through the main control module;

[0028] The operating mode and control mode of the control system are restored through the collaborative control module in the shutdown mode, and the cache data of the control system is cleared, so that the control system enters the standby state.

[0029] In a second aspect, the present application further provides a control system for an AC excitation variable speed pumped storage unit, the control system comprising a main control module, a speed regulation module and an AC excitation module;

[0030] The main control module is used to control the speed regulation module to execute the guide vane zero opening instruction and the AC excitation module to execute the stator end zero output power instruction when the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop operating state;

[0031] The speed regulating module is used to execute the guide vane zero opening instruction;

[0032] The AC excitation module is configured to execute the stator-end zero output power instruction and, based on the execution of the stator-end zero output power instruction, issue a first disconnection instruction to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit;

[0033] The main control module is further configured to issue a second disconnection instruction to the generator circuit breaker based on the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit; the generator circuit breaker is configured to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction;

[0034] The main control module is further configured to control the control system to enter a standby state when detecting that the generator circuit breaker is disconnected.

[0035] In a third aspect, the present application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0036] When the AC excitation variable speed pumped storage unit needs to enter the pumping stop state, the main control module in the control system of the AC excitation variable speed pumped storage unit controls the speed regulating module in the control system to execute the guide vane zero opening instruction, and controls the AC excitation module in the control system to execute the stator end zero output power instruction;

[0037] According to the execution of the stator-end zero output power instruction, a first disconnection instruction is issued to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit through the AC excitation module;

[0038] According to the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, a second disconnection instruction is issued to the generator circuit breaker through the main control module; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction;

[0039] When it is detected that the generator circuit breaker is disconnected, the control system is controlled to enter a standby state through the main control module.

[0040] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0041] When the AC excitation variable speed pumped storage unit needs to enter the pumping stop state, the main control module in the control system of the AC excitation variable speed pumped storage unit controls the speed regulating module in the control system to execute the guide vane zero opening instruction, and controls the AC excitation module in the control system to execute the stator end zero output power instruction;

[0042] According to the execution of the stator-end zero output power instruction, a first disconnection instruction is issued to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit through the AC excitation module;

[0043] According to the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, a second disconnection instruction is issued to the generator circuit breaker through the main control module; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction;

[0044] When it is detected that the generator circuit breaker is disconnected, the control system is controlled to enter a standby state through the main control module.

[0045] In a fifth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the following steps:

[0046] When the AC excitation variable speed pumped storage unit needs to enter the pumping stop state, the main control module in the control system of the AC excitation variable speed pumped storage unit controls the speed regulating module in the control system to execute the guide vane zero opening instruction, and controls the AC excitation module in the control system to execute the stator end zero output power instruction;

[0047] According to the execution of the stator-end zero output power instruction, a first disconnection instruction is issued to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit through the AC excitation module;

[0048] According to the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, a second disconnection instruction is issued to the generator circuit breaker through the main control module; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction;

[0049] When it is detected that the generator circuit breaker is disconnected, the control system is controlled to enter a standby state through the main control module.

[0050] The control method, system, computer equipment, computer-readable storage medium and computer program product of the above-mentioned AC excitation variable speed pumped storage unit are as follows: first, when the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop condition, the main control module in the control system of the AC excitation variable speed pumped storage unit controls the speed regulation module in the control system to execute the guide vane zero opening instruction, and controls the AC excitation module in the control system to execute the stator end zero output power instruction; then, according to the execution of the stator end zero output power instruction, the AC excitation module sends a first disconnection instruction to the generator circuit breaker of the AC excitation variable speed pumped storage unit; then, according to the execution of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, the main control module sends a second disconnection instruction to the generator circuit breaker; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction; then, when it is detected that the generator circuit breaker is disconnected, the main control module is used to control the control system to enter a standby state. In this way, firstly, since the AC excitation variable-speed pumped storage unit allows the generator motor to have the same amplitude as the grid voltage by controlling the AC excitation during the shutdown process, the active power loss of the water stirring is balanced by the rotor kinetic energy, and it is expected to significantly reduce the stator current when the generator circuit breaker is disconnected; secondly, by executing the guide vane zero opening instruction and the stator end zero output power instruction, it can be ensured that the stator current is zero when the generator circuit breaker is disconnected; thirdly, by triggering the disconnection of the generator circuit breaker under multiple conditions of the first disconnection instruction and the second disconnection instruction, it can be ensured that the pumping stop operation is carried out safely and orderly; the control method based on the above process can avoid the arcing phenomenon generated when the generator circuit breaker is disconnected, reduce the electrical wear and failure risk of the unit, and ensure that the pumping stop operation is carried out safely and orderly, thereby improving the stability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 A structural block diagram of a control system for an AC excitation variable speed pumped storage unit in one embodiment;

[0053] Figure 2 1 is a flow chart of a control method for an AC excitation variable speed pumped storage unit in one embodiment;

[0054] Figure 3 A flowchart illustrating steps of controlling the speed regulating module to execute a guide vane zero opening instruction and controlling the AC excitation module to execute a stator end zero output power instruction through a main control module in one embodiment;

[0055] Figure 4 A flowchart illustrating the steps of issuing a first disconnection instruction to a generator circuit breaker of an AC-excited variable-speed pumped-storage unit through an AC excitation module according to the execution of a stator-end zero output power instruction in one embodiment;

[0056] Figure 5 A flowchart illustrating the steps of issuing a second disconnection instruction to a generator circuit breaker via a main control module according to the execution status of a guide vane zero opening instruction or the unit output power of an AC excitation variable-speed pumped-storage unit in one embodiment;

[0057] Figure 6 A flowchart illustrating steps of controlling a control system to enter a standby state through a main control module in one embodiment;

[0058] Figure 7 Schematic diagram of a flow chart of a control method for an AC excitation variable speed pumped storage unit in another embodiment;

[0059] Figure 8 1. A flow chart of a method for controlling pumping and stopping a pump of an AC-excited variable-speed pumped-storage unit according to an embodiment;

[0060] Figure 9 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0062] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0063] The control method of the AC excitation variable speed pumped storage unit provided in the embodiment of the present application can be applied to Figure 1 The control system of the AC excitation variable speed pumped storage unit shown in FIG. The control system includes a main control module 110 , a speed regulation module 120 and an AC excitation module 130 .

[0064] Among them, the main control module 110 is used to receive control instructions issued by the control personnel for the AC excitation variable speed pumped storage unit, control the control process of the main current excitation variable speed pumped storage unit according to the control instructions, and monitor the operation of other modules.

[0065] The speed regulation module 120 is configured to control the guide vane opening of the AC excitation variable speed pumped storage unit in response to executing the received instruction.

[0066] The AC excitation module 130 is configured to control the stator-end output power of the AC excitation variable-speed pumped-storage unit by controlling the excitation current of the AC excitation variable-speed pumped-storage unit in response to executing the received instruction.

[0067] In a specific application, the main control module 110 is used to control the speed regulation module 120 to execute the guide vane zero opening instruction and control the AC excitation module 130 to execute the stator end zero output power instruction when the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop condition.

[0068] The speed regulating module 120 is used to execute the guide vane zero opening instruction.

[0069] The AC excitation module 130 is configured to execute the stator-end zero output power instruction and, based on the execution of the stator-end zero output power instruction, issue a first disconnection instruction to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit.

[0070] The main control module 110 is also used to send a second disconnection instruction to the generator circuit breaker based on the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction.

[0071] The main control module 110 is further configured to control the system to enter a standby state when it is detected that the generator circuit breaker is disconnected.

[0072] In practical applications, reference Figure 1 The control system further includes a coordinated control module 140. The main control module 110 is further configured to control the control process of the main current excitation variable speed pumped storage unit through the coordinated control module 140.

[0073] In specific applications, the control system and the various modules therein can be integrated on the server. It is understandable that they can also be installed on the terminal, or installed in a system including the server and the terminal, and realized through the interaction between the server and the terminal; wherein the server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services; the terminal can be but is not limited to various personal computers, laptops, smart phones, tablet computers, etc.

[0074] In an exemplary embodiment, Figure 2 As shown, a control method for an AC excitation variable speed pumped storage unit is provided, and the method is applied to Figure 1 The control system of the AC excitation variable speed pumped storage unit shown in FIG is used as an example to illustrate the control system, which includes the following steps S202 to S208.

[0075] Step S202, when the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop state, the main control module controls the speed regulation module to execute the guide vane zero opening instruction and controls the AC excitation module to execute the stator end zero output power instruction.

[0076] Among them, the target guide vane opening value carried by the guide vane zero opening instruction is zero, which is used to instruct the speed regulation module to adjust the guide vane opening of the AC excitation variable speed pumped storage unit to the zero guide vane opening.

[0077] The stator-end zero output power command carries a target stator-end output power value of zero, instructing the AC excitation module to adjust the stator-end output power of the AC-excited variable-speed pumped-storage unit to zero. In specific applications, when the stator-end output power is zero, the stator-end current is also zero.

[0078] Among them, the pump-stop operation mode is one of the operating modes of the AC excitation variable-speed pumped storage unit.

[0079] Specifically, when the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop condition, that is, when the AC excitation variable speed pumped storage unit needs to be controlled to pump and pump out, the main control module controls the speed regulation module to adjust the guide vane opening of the AC excitation variable speed pumped storage unit to zero, and controls the AC excitation module to adjust the stator end output power of the AC excitation variable speed pumped storage unit to zero.

[0080] In practical applications, since the guide vane opening cannot generally be completely reduced to zero, reducing the guide vane opening to a preset guide vane opening can be considered as reducing the guide vane opening to zero. The preset guide vane opening is related to the maximum guide vane opening, for example, a preset percentage of the maximum guide vane opening. In practical applications, 5% of the maximum guide vane opening is used.

[0081] Step S204: According to the execution of the stator-end zero output power instruction, a first disconnection instruction is issued to the generator circuit breaker of the AC excitation variable speed pumped storage unit through the AC excitation module.

[0082] The execution status of the stator-end zero output power instruction at least includes the completion status of the execution of the stator-end output power instruction, for example, whether the stator-end output power instruction has been completed.

[0083] Among them, the generator circuit breaker refers to GCB (Generator Circuit-Breaker).

[0084] Specifically, when the stator-end zero output power instruction is executed, the AC excitation module immediately sends a first disconnection instruction to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit.

[0085] Step S206: According to the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, a second disconnection instruction is issued to the generator circuit breaker through the main control module.

[0086] The generator circuit breaker is configured to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction; that is, the generator circuit breaker needs to perform a disconnection operation only after receiving the first disconnection instruction and the second disconnection instruction.

[0087] The execution status of the guide vane zero opening instruction at least includes the completion status of the execution of the guide vane zero opening instruction, for example, whether the guide vane zero opening instruction has been completed, and also for example, the time when the guide vane zero opening instruction has been completed.

[0088] Specifically, the main control module sends a second disconnection instruction to the generator circuit breaker when any of the following trigger conditions is met:

[0089] (1) The guide vane zero opening instruction is executed, and the time between the moment when the guide vane zero opening instruction is executed and the current moment is greater than or equal to the preset time;

[0090] (2) The unit output power of the AC excitation variable speed pumped storage unit is less than the preset power; where the unit output power refers to the absolute value of the export power of the AC excitation variable speed pumped storage unit, and the preset power is 20MW (megawatts).

[0091] In specific applications, the above trigger conditions may also include:

[0092] (3) Receive the "AC excitation current frequency over limit alarm".

[0093] Step S208: When it is detected that the generator circuit breaker is disconnected, the control system is controlled to enter a standby state through the main control module.

[0094] Among them, the standby state is one of the working modes of the control system; when the control system enters the standby state, it means that the control system is in a safe mode of stopping working and waiting for the next task.

[0095] Specifically, when it is detected that the generator circuit breaker is disconnected, the main control module clears the cache data by restoring the working mode and control mode of each module in the control system, so that the control system enters the standby state.

[0096] It is easy to understand that the control system's detection of the outside world, such as the stator-end output power, guide vane opening, unit output power, etc. of the AC-excited variable-speed pumped storage unit, can be achieved through the monitoring function of the main control module.

[0097] In the control method of the above-mentioned AC excitation variable speed pumped storage unit, first, when the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop condition, the main control module controls the speed regulation module in the control system to execute the guide vane zero opening instruction, and controls the AC excitation module in the control system to execute the stator end zero output power instruction; then, according to the execution of the stator end zero output power instruction, the AC excitation module sends a first disconnection instruction to the generator circuit breaker of the AC excitation variable speed pumped storage unit; then, according to the execution of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, the main control module sends a second disconnection instruction to the generator circuit breaker; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction; then, when it is detected that the generator circuit breaker is disconnected, the main control module controls the control system to enter the standby state. In this way, firstly, since the AC excitation variable-speed pumped storage unit allows the generator motor to have the same amplitude as the grid voltage by controlling the AC excitation during the shutdown process, the active power loss of the water stirring is balanced by the rotor kinetic energy, and it is expected to significantly reduce the stator current when the generator circuit breaker is disconnected; secondly, by executing the guide vane zero opening instruction and the stator end zero output power instruction, it can be ensured that the stator current is zero when the generator circuit breaker is disconnected; thirdly, by triggering the disconnection of the generator circuit breaker under multiple conditions of the first disconnection instruction and the second disconnection instruction, it can be ensured that the pumping stop operation is carried out safely and orderly; the control method based on the above process can avoid the arcing phenomenon generated when the generator circuit breaker is disconnected, reduce the electrical wear and failure risk of the unit, and ensure that the pumping stop operation is carried out safely and orderly, thereby improving the stability of the power system.

[0098] In an exemplary embodiment, Figure 3 As shown, the above step S202, through the main control module, controls the speed regulation module to execute the guide vane zero opening instruction, and controls the AC excitation module to execute the stator end zero output power instruction, which specifically includes the following steps:

[0099] In step S302, the main control module sends a pump stop control instruction to the collaborative control module in the control system, so that the collaborative control module controls the speed regulation module to enter the opening control mode, and sends a guide vane zero opening instruction to the speed regulation module, and controls the AC excitation module to enter the speed control mode, and sends a stator end zero output power instruction to the AC excitation module.

[0100] Step S304: executing the guide vane zero opening instruction through the speed regulating module in the opening control mode.

[0101] Step S306: When it is detected that the speed regulating module has completed executing the guide vane zero opening instruction, the coordinated control module is used to control the AC excitation module to enter the power control mode.

[0102] Step S308: executing the stator-end zero output power instruction through the AC excitation module in the power control mode.

[0103] Among them, the opening control mode is one of the control modes of the speed regulation module. In the opening control mode, the guide vane opening of the AC excitation variable speed pumped storage unit is the main control variable.

[0104] Among them, the speed control mode is one of the control modes of the AC excitation module. In the speed control mode, the rotor speed of the AC excitation variable-speed pumped storage unit is the main controlled variable.

[0105] Among them, the power control mode is one of the control modes of the AC excitation module. In the speed control mode, the stator-end output power of the AC excitation variable-speed pumped storage unit is the main control variable.

[0106] Specifically, the main control module sends a pump stop control instruction to the cooperative control module in the control system, so that the cooperative control module controls the speed regulation module to enter the opening control mode, and sends a guide vane zero opening instruction to the speed regulation module, so that the speed regulation module adjusts the guide vane opening of the AC excitation variable speed pumped storage unit to zero guide vane opening, and controls the AC excitation module to enter the speed control mode, and sends a stator end zero output power instruction to the AC excitation module, so that the AC excitation module adjusts the stator end output power of the AC excitation variable speed pumped storage unit to zero.

[0107] Then, the speed regulating module in the opening control mode executes the guide vane zero opening instruction and adjusts the guide vane opening toward the zero guide vane opening.

[0108] Then, when it is detected that the speed regulation module has completed the execution of the guide vane zero opening instruction, the cooperative control module controls the AC excitation module to enter the power control mode.

[0109] Then, the AC excitation module in the power control mode executes the stator-end zero output power instruction and adjusts the stator-end output power to zero.

[0110] In specific applications, the AC excitation module will first reduce the rotor speed of the current-excited variable-speed pumped storage unit in response to the stator-end output power instruction in the speed control mode, and then execute the stator-end zero output power instruction in the power control mode. In this way, the safety risks caused by large transient short-circuit voltage and current can be avoided.

[0111] In this embodiment, through the orderly execution of the guide vane zero opening instruction and the stator end zero output power instruction, the same amplitude of the generator motor back electromotive force and the grid voltage can be achieved, and the active power loss of stirring water is balanced by the rotor kinetic energy, thereby reducing the stator current when the generator circuit breaker is disconnected, ensuring that the stator current is zero when the generator circuit breaker is disconnected, and thus avoiding the arcing phenomenon generated when the generator circuit breaker is disconnected, reducing the electrical wear and failure risk of the unit, and ensuring that the pumping and pumping stop operations are carried out safely and orderly, thereby improving the stability of the power system.

[0112] In an exemplary embodiment, the above step S302, through the main control module, sends a pumping stop control instruction to the collaborative control module in the control system, so that the collaborative control module controls the speed regulation module to enter the opening control mode, and sends a guide vane zero opening instruction to the speed regulation module, as well as controls the AC excitation module to enter the speed control mode, and sends a stator end zero output power instruction to the AC excitation module, specifically including the following contents: through the main control module, sending a pumping stop control instruction to the collaborative control module; through the collaborative control module whose corresponding instruction enable signal is a valid enable value, controls the speed regulation module to enter the opening control mode, and sends a guide vane zero opening instruction to the speed regulation module, as well as controls the AC excitation module to enter the speed control mode, and sends a stator end zero output power instruction to the AC excitation module.

[0113] The collaborative control module is used to perform operation optimization calculations for the AC-excited variable-speed pumped-storage unit to find the optimal operating point. The collaborative control module is also used to respond to a pump-off control instruction, stop the operation optimization calculations for the AC-excited variable-speed pumped-storage unit, and set the collaborative control module's instruction enable signal to a valid enable value. The instruction enable signal is used to indicate whether the instruction issued by the collaborative control module is valid. Instructions issued by the collaborative control module with a valid enable value are valid, while instructions issued by the collaborative control module with an invalid enable value are invalid.

[0114] Among them, the speed control module is used to execute the guide vane zero opening instruction when the guide vane zero opening instruction is the instruction issued by the cooperative control module when the instruction enable signal is the valid enable value; the AC excitation module is used to execute the stator end zero output power instruction when the stator end zero output power instruction is the instruction issued by the cooperative control module when the instruction enable signal is the valid enable value.

[0115] Specifically, when the AC excitation variable speed pumped storage unit needs to enter the pumping stop condition, the main control module sends a pumping stop control instruction to the collaborative control module. In response to the pumping stop instruction, the collaborative control module stops the operation optimization calculation for the AC excitation variable speed pumped storage unit and sets the instruction enable signal of the collaborative control module to the valid enable value; then, under the valid enable value, the collaborative control module controls the speed regulation module to enter the opening control mode, and sends a guide vane zero opening instruction to the speed regulation module, and controls the AC excitation module to enter the speed control mode, and sends a stator end zero output power instruction to the AC excitation module.

[0116] After receiving the guide vane zero opening instruction, the speed control module will confirm whether the guide vane zero opening instruction is issued by the collaborative control module under the valid enable value. If so, the guide vane zero opening instruction is valid and the guide vane zero opening instruction is executed. If not, the guide vane zero opening instruction is invalid and the guide vane zero opening value is not executed.

[0117] Similarly, after receiving the stator-end zero output power instruction, the AC excitation module will confirm whether the stator-end zero output power instruction is issued by the collaborative control module under the valid enable value. If so, the stator-end zero output power instruction is valid and the stator-end zero output power instruction is executed. If not, the stator-end zero output power instruction is invalid and the stator-end zero output power instruction is not executed.

[0118] In a specific application, when the pump stop control is completed, the collaborative control module sets the command enable signal to an invalid enable value.

[0119] In this embodiment, through the stop operation optimization calculation of the collaborative control module, it can be ensured that the pumping stop control operation is not interfered with by the optimization process; through the setting of the instruction enable signal, it can be ensured that the speed regulation module and the AC excitation module execute the instructions correctly and safely, thereby ensuring that the pumping stop operation is carried out safely and orderly, thereby improving the stability of the power system.

[0120] In an exemplary embodiment, the execution status of the stator-end zero output power instruction at least includes a completion status of the execution of the stator-end zero output power instruction.

[0121] The completion status of the execution of the stator-end zero output power instruction at least includes whether the stator-end zero output power instruction has been completed.

[0122] like Figure 4 As shown, the above step S204, based on the execution of the stator-end zero output power instruction, sends a first disconnection instruction to the generator circuit breaker of the AC excitation variable speed pumped storage unit through the AC excitation module, which specifically includes the following steps:

[0123] Step S402 : When it is detected that the stator-end output power of the AC excitation variable-speed pumped-storage generator set is reduced to zero power, it is determined that the stator-end zero output power instruction has been executed.

[0124] Step S404: When the stator-end zero output power instruction is executed, a first disconnection instruction is sent to the generator circuit breaker through the AC excitation module.

[0125] Specifically, when the control system detects that the stator-end output power of the AC excitation variable-speed pumped storage unit is reduced to zero power, it determines that the stator-end zero output power instruction has been executed; when the stator-end zero output power instruction has been executed, the AC excitation module sends a first disconnection instruction to the generator circuit breaker.

[0126] In this embodiment, the disconnection of the generator circuit breaker is triggered by multiple conditions of the first disconnection instruction and the second disconnection instruction, which can ensure that the pumping and stopping operation is carried out safely and orderly, thereby improving the stability of the power system.

[0127] In an exemplary embodiment, the execution status of the guide vane zero opening instruction at least includes the completion status of the execution of the guide vane zero opening instruction.

[0128] The completion status of the execution of the guide vane zero opening instruction at least includes whether the guide vane zero opening instruction is completed and the time when the guide vane zero opening instruction is completed.

[0129] like Figure 5 As shown, the above step S206, based on the execution of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, sends a second disconnection instruction to the generator circuit breaker through the main control module, which specifically includes the following steps:

[0130] Step S502 : When it is detected that the guide vane opening of the AC excitation variable speed pumped storage unit is reduced to a preset guide vane opening, it is determined that the guide vane zero opening instruction has been executed.

[0131] Step S504: After the guide vane zero opening instruction is executed for a preset time or when the unit output power is less than the preset power, a second disconnection instruction is sent to the generator circuit breaker through the main control module.

[0132] Specifically, when the control system detects that the guide vane opening of the AC excitation variable speed pumped storage unit is reduced to a preset guide vane opening, it determines that the guide vane zero opening instruction has been executed and records the moment when the guide vane zero opening instruction is executed; then, when the time between the moment when the guide vane zero opening instruction is executed and the current moment is greater than or equal to the preset time, that is, after the guide vane zero opening instruction is executed for the preset time, or when the unit output power of the AC excitation variable speed pumped storage unit is less than the preset power, the main control module sends a second disconnection instruction to the generator circuit breaker.

[0133] In this embodiment, the disconnection of the generator circuit breaker is triggered by multiple conditions of the first disconnection instruction and the second disconnection instruction, which can ensure that the pumping and stopping operation is carried out safely and orderly, thereby improving the stability of the power system.

[0134] In an exemplary embodiment, Figure 6 As shown, the above step S208, through the main control module, controls the control system to enter the standby state, which specifically includes the following steps:

[0135] Step S602: Control the cooperative control module in the control system to enter a shutdown mode through the main control module.

[0136] In step S604, the operating mode and control mode of the control system are restored through the cooperative control module in the shutdown mode, and the cache data of the control system is cleared, so that the control system enters the standby state.

[0137] The operating mode and control mode of the control system refer to the operating mode and control mode of each module in the control system.

[0138] Among them, the shutdown mode is one of the operating modes of the collaborative control module.

[0139] Among them, restoring the operating mode and control mode of the control system can be to restore the operating mode and control mode of each module in the control system to the operating mode and control mode before the pumping stop control is performed, or to restore the operating mode and control mode of each module to the default operating mode and default control mode.

[0140] Specifically, when it is detected that the generator circuit breaker is disconnected, the main control module sends a shutdown command to the collaborative control module to make the collaborative control module enter the shutdown mode; the collaborative control module entering the shutdown mode restores the operating mode and control mode of each module in the control system, and clears the cache data of the control system, so that the control system enters the standby state, which is a safe mode of stopping work and waiting for the next task.

[0141] In this embodiment, by controlling the control system to enter the standby state, the control system can be placed in a safe mode of stopping work and waiting for the next task.

[0142] In an exemplary embodiment, Figure 7 As shown in FIG, another control method of AC excitation variable speed pumped storage unit is provided, and this method is applied to Figure 1 The control system shown in the figure is used as an example to illustrate the following steps:

[0143] In step S702 , the main control module sends a pump stop control instruction to the collaborative control module.

[0144] Step S704, the collaborative control module, in response to the pump stop control instruction, stops the operation optimization calculation for the AC excitation variable speed pumped storage unit, and sets the instruction enable signal of the collaborative control module to the valid enable value, controls the speed regulation module to enter the opening control mode, and sends the guide vane zero opening instruction to the speed regulation module, controls the AC excitation module to enter the speed control mode, and sends the stator end zero output power instruction to the AC excitation module.

[0145] In step S706 , the speed regulating module executes the guide vane zero opening instruction when the guide vane zero opening instruction is issued by the cooperative control module when the instruction enable signal is a valid enable value.

[0146] Step S708: When the guide vane zero opening instruction is executed, the cooperative control module controls the AC excitation module to enter the power control mode.

[0147] In step S710 , the AC excitation module executes the stator-end zero output power instruction when the stator-end zero output power instruction is issued by the cooperative control module when the instruction enable signal is a valid enable value.

[0148] Step S712: When it is detected that the stator-end output power of the AC excitation variable-speed pumped storage unit is reduced to zero power, it is determined that the stator-end zero output power instruction has been executed, and a first disconnection instruction is issued to the generator circuit breaker through the AC excitation module.

[0149] Step S714, when it is detected that the guide vane opening of the AC excitation variable speed pumped storage unit is reduced to the preset guide vane opening, it is determined that the guide vane zero opening instruction has been executed. After the guide vane zero opening instruction has been executed for a preset time or the unit output power of the AC excitation variable speed pumped storage unit is less than the preset power, the main control module sends a second disconnection instruction to the generator circuit breaker.

[0150] Step S716: The generator circuit breaker performs a disconnection operation in response to the first disconnection instruction and the second disconnection instruction.

[0151] Step S718: When it is detected that the generator circuit breaker is disconnected, the main control module controls the cooperative control module to enter the shutdown mode.

[0152] In step S720 , the collaborative control module restores the operating mode and control mode of the control system and clears the cached data of the control system so that the control system enters a standby state.

[0153] In this embodiment, firstly, since the AC excitation variable-speed pumped storage unit allows the generator motor to have the same amplitude as the grid voltage by controlling the AC excitation during the shutdown process, the active power loss of the water stirring is balanced by the rotor kinetic energy, and it is expected to significantly reduce the stator current when the generator circuit breaker is disconnected; secondly, by executing the guide vane zero opening instruction and the stator end zero output power instruction, it can be ensured that the stator current is zero when the generator circuit breaker is disconnected; thirdly, by triggering the disconnection of the generator circuit breaker under multiple conditions of the first disconnection instruction and the second disconnection instruction, it can be ensured that the pumping stop operation is carried out safely and orderly; the control method based on the above process can avoid the arcing phenomenon generated when the generator circuit breaker is disconnected, reduce the electrical wear and failure risk of the unit, and ensure that the pumping stop operation is carried out safely and orderly, thereby improving the stability of the power system.

[0154] In order to more clearly illustrate the control method of the AC excitation variable speed pumped storage unit provided in the embodiment of the present application, the control method of the AC excitation variable speed pumped storage unit is specifically described below with a specific embodiment, but it should be understood that the embodiment of the present application is not limited thereto. Figure 8 As shown, in one exemplary embodiment, the present application also provides an AC excitation variable speed pumped storage unit pumping and pumping stop control method, which specifically includes the following steps:

[0155] 1. Pumping stop control process:

[0156] S1. After receiving the "pump stop control" instruction from the main control module, the collaborative control module sets the AC excitation module to the speed control mode and the speed regulation module to the opening control mode.

[0157] S2. The collaborative control module stops all optimization calculation processes related to collaborative control and the output of their results to ensure that the pump stop control operation is not interfered with by the optimization process.

[0158] S3. The cooperative control module sends a "pump stop control mode" signal to the AC excitation module and simultaneously sets the "set value enable" signal to 1. When this enable signal is 1, the set value sent by the cooperative control module to the AC excitation module and the speed regulation module is effective.

[0159] S4: The coordinated control module sends the zero power setting value to the AC excitation module and the zero opening setting value to the speed regulator module. The speed regulator adjusts the guide vane opening to zero according to the set slope.

[0160] S5. Monitor the guide vane opening status until the guide vane opening drops to a set value (e.g., less than 5% of the maximum value of the guide vane opening group).

[0161] S6. When the guide vane opening meets the set requirements, the coordinated control module immediately orders the AC excitation module to switch to power control mode. Upon receiving the power control mode, the AC excitation module immediately executes the zero power setpoint, reducing the unit's stator current to zero.

[0162] S7: After completing the zero power setting operation, the AC excitation module immediately issues a command to disconnect the generator circuit breaker. This command contact is connected in parallel with the main control module's generator circuit breaker disconnect command contact to execute the generator circuit breaker disconnect operation. At the same time, the "AC excitation command to disconnect the generator circuit breaker" signal is fed back to the main control module via communication.

[0163] S8: The main control module assists in issuing a command to cut off the generator circuit breaker according to one of the following conditions:

[0164] (1) The absolute value of the unit's export power is less than 20MW.

[0165] (2) The guide vane opening is less than 5% and the delay exceeds a specific time (adjustable).

[0166] (3) Receive the "AC excitation current frequency over limit alarm".

[0167] S9: After the generator circuit breaker is disconnected, or the pump stop control command is delayed for a certain period of time (adjustable), the main control module returns to the pump stop control command and issues the instruction of "setting the collaborative control module shutdown mode".

[0168] 2. Collaborative control module shutdown control process:

[0169] S10: The collaborative control module receives the "set collaborative controller shutdown mode" command and enters the shutdown mode.

[0170] S11: The collaborative control module restores all operating modes and control modes so that the control system is in a normal standby state and is ready to process subsequent tasks.

[0171] S12: The collaborative control module clears all non-default cache data to ensure that there is no historical calculation residue in the control system in shutdown mode to prevent interference with subsequent operations.

[0172] S13: The collaborative control module enters the initial standby state, and the control system is in a safe mode of stopping work and waiting for the next task.

[0173] In this embodiment, first, by optimizing the control strategy, the stator current is controlled to zero during system pump stop and shutdown, ensuring that there is no current arcing when the generator circuit breaker is disconnected, thereby avoiding electrical wear and arc-induced fault risks. Second, smooth switching is achieved by precisely setting zero power and zero opening values, and synchronously adjusting the guide vane opening and excitation control, ensuring a smooth transition between pump stop and shutdown mode switching, and avoiding system disturbances caused by sudden changes. Third, system safety and stability are improved. During the pump stop process, the monitoring system and the collaborative controller work together to trigger the generator circuit breaker to disconnect based on multiple conditions, ensuring safe and orderly pump stop operations and effectively improving the safety and stability of the system. Third, through control optimization, approximately 30% of non-zero input conditions during pump stop are eliminated, preventing high active current from remaining at the stator port when the generator circuit breaker is opened, and extending the service life of the switch. The above method provides a clear pump stop control process with automated and intelligent features, reducing manual intervention and improving the accuracy and efficiency of system operations.

[0174] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0175] Based on the same inventive concept, embodiments of the present application also provide a control system for an AC-excited variable-speed pumped-storage unit for implementing the aforementioned control method for an AC-excited variable-speed pumped-storage unit. The solution provided by this system is similar to the solution described in the aforementioned method. Therefore, the specific limitations of the control system embodiments for one or more AC-excited variable-speed pumped-storage units provided below can be found in the aforementioned limitations for the control method for an AC-excited variable-speed pumped-storage unit, and will not be further elaborated here.

[0176] In an exemplary embodiment, Figure 1 As shown, a control system for an AC excitation variable speed pumped storage unit is provided, comprising: a main control module 110, a speed regulation module 120 and an AC excitation module 130, wherein:

[0177] The main control module 110 is used to control the speed regulation module 120 to execute the guide vane zero opening instruction and the AC excitation module 130 to execute the stator end zero output power instruction when the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop state.

[0178] The speed regulating module 120 is used to execute the guide vane zero opening instruction.

[0179] The AC excitation module 130 is configured to execute the stator-end zero output power instruction and, based on the execution of the stator-end zero output power instruction, issue a first disconnection instruction to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit.

[0180] The main control module 110 is also used to send a second disconnection instruction to the generator circuit breaker based on the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction.

[0181] The main control module 110 is further configured to control the control system to enter a standby state when it is detected that the generator circuit breaker is disconnected.

[0182] In an exemplary embodiment, the main control module 110 is also used to send a pump stop control instruction to the collaborative control module 140 in the control system, so that the collaborative control module 140 controls the speed regulation module 120 to enter the opening control mode, and sends a guide vane zero opening instruction to the speed regulation module 120, and controls the AC excitation module 130 to enter the speed control mode, and sends a stator end zero output power instruction to the AC excitation module 130.

[0183] The speed regulating module 120 is also used to execute the guide vane zero opening instruction in the opening control mode;

[0184] The collaborative control module 140 is further configured to control the AC excitation module 130 to enter a power control mode when it is detected that the speed regulation module 120 has completed executing the guide vane zero opening instruction.

[0185] The AC excitation module 130 is also used to execute a stator-end zero output power instruction in the power control mode.

[0186] In an exemplary embodiment, the main control module 110 is further configured to send a pump stop control instruction to the collaborative control module 140 .

[0187] The collaborative control module 140 is also used to respond to the pump stop control instruction, stop the operation optimization calculation for the AC excitation variable speed pumped storage unit, and set the instruction enable signal of the collaborative control module 140 to a valid enable value; control the speed regulation module 120 to enter the opening control mode, and send a guide vane zero opening instruction to the speed regulation module 120, and control the AC excitation module 130 to enter the speed control mode, and send a stator end zero output power instruction to the AC excitation module 130.

[0188] The speed regulating module 120 is further configured to execute the guide vane zero opening instruction when the guide vane zero opening instruction is issued by the cooperative control module 140 when the instruction enable signal is a valid enable value.

[0189] The AC excitation module 130 is further configured to execute the stator-end zero output power instruction when the stator-end zero output power instruction is issued by the cooperative control module 140 when the instruction enable signal is a valid enable value.

[0190] In an exemplary embodiment, the control system is configured to determine that the stator-end zero output power instruction has been executed when detecting that the stator-end output power of the AC excitation variable-speed pumped storage unit has decreased to zero power.

[0191] The AC excitation module 130 is further configured to send a first disconnection instruction to the generator circuit breaker when the stator-end zero output power instruction is executed.

[0192] In an exemplary embodiment, the control system is further configured to determine that the guide vane zero opening instruction has been executed when it is detected that the guide vane opening of the AC excitation variable speed pumped storage unit is reduced to a preset guide vane opening.

[0193] The main control module 110 is further configured to send a second disconnection instruction to the generator circuit breaker after the guide vane zero opening instruction has been executed for a preset time period or when the unit output power is less than a preset power.

[0194] In an exemplary embodiment, the main control module 110 is further configured to control the cooperative control module 140 in the control system to enter a shutdown mode.

[0195] The collaborative control module 140 is further configured to restore the operating mode and control mode of the control system in the shutdown mode, and clear the cached data of the control system so that the control system enters the standby state.

[0196] Each module in the control system of the aforementioned AC-excited variable-speed pumped storage unit can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a computer device memory in software form, so that the processor can call and execute the corresponding operations of each module.

[0197] In an exemplary embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as shown in FIG. Figure 9 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, memory and input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store operating data of the AC excitation variable speed pumped storage unit. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a control method for an AC excitation variable speed pumped storage unit is implemented.

[0198] Those skilled in the art will understand that Figure 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0199] In an exemplary embodiment, a computer device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0200] In an exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0201] In an exemplary embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0202] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. In particular, any reference to memory, database, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0203] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0204] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A control method for an AC excitation variable speed pumped storage unit, characterized in that: A control system applied to an AC excitation variable speed pumped storage unit, the control system comprising a main control module, a speed regulation module and an AC excitation module, the method comprising: In the case where the AC excitation variable speed pumped storage unit needs to enter a pumping and pumping stop condition, the main control module is used to control the speed regulating module to execute a guide vane zero opening instruction and to control the AC excitation module to execute a stator end zero output power instruction; the guide vane zero opening instruction is used to instruct the speed regulating module to adjust the guide vane opening of the AC excitation variable speed pumped storage unit to zero guide vane opening; the stator end zero output power instruction is used to instruct the excitation module to adjust the stator end output power of the AC excitation variable speed pumped storage unit to zero; According to the execution of the stator-end zero output power instruction, a first disconnection instruction is issued to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit through the AC excitation module; According to the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit, a second disconnection instruction is issued to the generator circuit breaker through the main control module; the generator circuit breaker is used to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction; When it is detected that the generator circuit breaker is disconnected, the control system is controlled to enter a standby state through the main control module.

2. The method according to claim 1, characterized in that The main control module is used to control the speed regulating module to execute the guide vane zero opening instruction and the AC excitation module to execute the stator end zero output power instruction, including: The main control module issues a pump stop control instruction to the cooperative control module in the control system, so that the cooperative control module controls the speed regulating module to enter the opening control mode and issues the guide vane zero opening instruction to the speed regulating module, and controls the AC excitation module to enter the speed control mode and issues the stator end zero output power instruction to the AC excitation module; Executing the guide vane zero opening instruction through the speed regulating module in the opening control mode; When it is detected that the speed regulation module has completed executing the guide vane zero opening instruction, the coordinated control module controls the AC excitation module to enter a power control mode; The stator-end zero output power instruction is executed by the AC excitation module in the power control mode.

3. The method according to claim 2, characterized in that The main control module sends a pump stop control instruction to the cooperative control module in the control system, so that the cooperative control module controls the speed regulating module to enter the opening control mode and sends the guide vane zero opening instruction to the speed regulating module, and controls the AC excitation module to enter the speed control mode and sends the stator end zero output power instruction to the AC excitation module, including: The main control module issues a pump-stop control instruction to the collaborative control module; the collaborative control module is configured to, in response to the pump-stop control instruction, stop the operation optimization calculation for the AC excitation variable speed pumped storage unit and set the instruction enable signal of the collaborative control module to a valid enable value; By means of the collaborative control module whose corresponding instruction enable signal is the effective enable value, the speed regulating module is controlled to enter the opening control mode and the guide vane zero opening instruction is issued to the speed regulating module; and the AC excitation module is controlled to enter the speed control mode and the stator end zero output power instruction is issued to the AC excitation module; Among them, the speed regulation module is used to execute the guide vane zero opening instruction when the guide vane zero opening instruction is issued by the collaborative control module when the instruction enable signal is the effective enable value; the AC excitation module is used to execute the stator end zero output power instruction when the stator end zero output power instruction is issued by the collaborative control module when the instruction enable signal is the effective enable value.

4. The method according to claim 1, wherein The execution status of the stator-end zero output power instruction at least includes the completion status of the execution of the stator-end zero output power instruction; The step of issuing a first disconnection instruction to a generator circuit breaker of the AC excitation variable speed pumped storage generator set through the AC excitation module according to the execution of the stator-end zero output power instruction includes: When it is detected that the stator-end output power of the AC excitation variable-speed pumped storage generator set is reduced to zero power, determining that the stator-end zero output power instruction has been executed; When the stator-end zero output power instruction is executed, the first disconnection instruction is sent to the generator circuit breaker through the AC excitation module.

5. The method according to claim 1, wherein The execution status of the guide vane zero opening instruction at least includes the completion status of the execution of the guide vane zero opening instruction; The method of issuing a second disconnection instruction to the generator circuit breaker through the main control module according to the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit includes: When it is detected that the guide vane opening of the AC excitation variable speed pumped storage unit is reduced to a preset guide vane opening, determining that the guide vane zero opening instruction has been executed; After the guide vane zero opening instruction is executed for a preset time period or when the unit output power is less than a preset power, the second disconnection instruction is sent to the generator circuit breaker through the main control module.

6. The method according to any one of claims 1 to 5, characterized in that The controlling the control system to enter a standby state through the main control module includes: Controlling the collaborative control module in the control system to enter a shutdown mode through the main control module; The operating mode and control mode of the control system are restored through the collaborative control module in the shutdown mode, and the cache data of the control system is cleared, so that the control system enters the standby state.

7. A control system for an AC excitation variable speed pumped storage unit, characterized in that: The control system includes a main control module, a speed regulation module and an AC excitation module; The main control module is used to control the speed regulating module to execute the guide vane zero opening instruction and the AC excitation module to execute the stator end zero output power instruction when the AC excitation variable speed pumped storage unit needs to enter the pumping and pumping stop state; the guide vane zero opening instruction is used to instruct the speed regulating module to adjust the guide vane opening of the AC excitation variable speed pumped storage unit to zero guide vane opening; the stator end zero output power instruction is used to instruct the excitation module to adjust the stator end output power of the AC excitation variable speed pumped storage unit to zero; The speed regulating module is used to execute the guide vane zero opening instruction; The AC excitation module is configured to execute the stator-end zero output power instruction and, based on the execution of the stator-end zero output power instruction, issue a first disconnection instruction to the generator circuit breaker of the AC excitation variable-speed pumped-storage unit; The main control module is further configured to issue a second disconnection instruction to the generator circuit breaker based on the execution status of the guide vane zero opening instruction or the unit output power of the AC excitation variable speed pumped storage unit; the generator circuit breaker is configured to perform a disconnection operation in response to the first disconnection instruction and the second disconnection instruction; The main control module is further configured to control the control system to enter a standby state when detecting that the generator circuit breaker is disconnected.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

Images