A variable speed unit of a pumped storage power station and a control method thereof

Abstract

The present application provides a variable speed unit of a pumped storage power station and a control method thereof, which belongs to the field of automation technology. The pumped storage power station is coupled with a wind farm and connected to a power grid system. The method comprises: obtaining power operation parameters of a wind turbine device in the wind farm, and determining a first impedance voltage drop parameter when the wind turbine device is connected to the power grid and a second impedance voltage drop parameter when the wind turbine device is connected to the pumped storage power station based on the power operation parameters; determining a first steady-state value between the wind turbine device and the power grid system based on the first impedance voltage drop parameter, the first steady-state value being used to characterize the stable connection state between the wind turbine device and the power grid system; determining a second steady-state value between the wind turbine device and the variable speed unit based on the second impedance voltage drop parameter, the second steady-state value being used to characterize the stable connection state between the wind turbine device and the pumped storage power station; and determining the operating pumping power of the variable speed unit based on the first steady-state value and the second steady-state value.

Description

Technical Field

[0001] The present application relates to the field of automation, and in particular to a variable speed unit of a pumped storage power station and a control method thereof. Background Art

[0002] A pumped storage power station is a special type of hydropower station that converts electrical energy into potential energy and stores it by utilizing height differences and water level changes, and then converts the potential energy into electrical energy and supplies it to the power grid when needed. Pumped storage power stations have multiple functions such as regulating power grid load, stabilizing power supply, and improving energy utilization efficiency, and are an important part of the modern power system.

[0003] The construction principle of pumped storage power stations is based on the water cycle and the law of conservation of energy. When the demand for electricity is low, excess electricity is used to pump water from low places to high reservoirs, and the electricity is converted into potential energy and stored. When the demand for electricity peaks, the stored potential energy is converted into electricity by releasing water to generate electricity to meet the power supply needs of the power grid. This energy conversion process is both environmentally friendly and efficient, and can achieve power balance on different time scales. Pumped storage power stations can effectively smooth out the load fluctuations of the power grid and stabilize the power supply. Due to the volatility of power demand, pumped storage power stations can store electricity when the demand for electricity is low and release electricity at peak times, thereby alleviating the power supply pressure of the power grid. Secondly, pumped storage power stations can improve energy utilization efficiency. In wind power generation, due to the instability of weather conditions, the power generation output is often difficult to predict and control. Pumped storage power stations can store the excess electricity generated by these renewable energy sources and supplement the power supply when needed, thereby improving energy utilization.

[0004] However, due to the instability of the power generation of wind power stations, how to safely respond to the energy storage power station and accurately control the power of the variable speed pumping units of the energy storage power station is an urgent problem to be solved. Summary of the invention

[0005] The embodiments of the present application provide a variable speed unit of a pumped storage power station and a control method thereof to improve the above-mentioned problems.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a variable speed unit control method for a pumped storage power station, wherein the pumped storage power station is coupled with a wind farm and connected to a power grid system, and the method includes:

[0008] Obtaining power operation parameters of wind turbine equipment in the wind farm, and determining a first impedance voltage drop parameter when the wind turbine equipment is connected to the power grid and a second impedance voltage drop parameter when the wind turbine equipment is connected to a pumped storage power station based on the power operation parameters;

[0009] Determine a first steady-state value between the wind turbine device and the power grid system based on the first impedance voltage drop parameter, the first steady-state value is used to characterize the stable state of the connection between the wind turbine device and the power grid system; determine a second steady-state value between the wind turbine device and the variable speed unit based on the second impedance voltage drop parameter, the second steady-state value is used to characterize the stable state of the connection between the wind turbine device and the pumped-storage power station;

[0010] Based on the first steady-state value and the second steady-state value, the operating pumping power of the variable speed unit is determined.

[0011] In combination with the first aspect, in some implementations, obtaining power operation parameters of a wind turbine device in a wind farm, and determining a first impedance voltage drop parameter when the wind turbine device is connected to a power grid based on the power operation parameters, and a second impedance voltage drop parameter when the wind turbine device is connected to a pumped storage power station, include:

[0012] Calculate the terminal voltage vector of the wind turbine device according to the voltage amplitude of the power grid and the rated terminal voltage of the wind turbine device;

[0013] Decompose the terminal voltage vector of the wind turbine equipment into components in the quadrature axis direction;

[0014] According to the quadrature-axis component of the fan equipment, the first impedance voltage drop parameter of the fan equipment is calculated.

[0015] In combination with the first aspect, in some implementations, obtaining power operation parameters of a wind turbine device in a wind farm, and determining a first impedance voltage drop parameter when the wind turbine device is connected to a power grid based on the power operation parameters, and a second impedance voltage drop parameter when the wind turbine device is connected to a pumped storage power station, include:

[0016] Calculate the terminal voltage vector of the wind turbine device according to the voltage amplitude of the power grid and the rated terminal voltage of the wind turbine device;

[0017] Decompose the terminal voltage vector of the wind turbine equipment into components in the direct axis direction;

[0018] According to the direct axis component of the fan equipment, a second impedance voltage drop parameter of the fan equipment is calculated.

[0019] In combination with the first aspect, in some implementations, a first steady-state value between the wind turbine device and the power grid system is determined based on a first impedance voltage drop parameter, the first steady-state value is used to characterize the stable state of the connection between the wind turbine device and the power grid system, and a second steady-state value between the wind turbine device and the variable speed unit is determined based on a second impedance voltage drop parameter, the second steady-state value is used to characterize the stable state of the connection between the wind turbine device and the pumped storage power station, including:

[0020] Obtain reactive power compensation characteristic parameters of wind turbine equipment;

[0021] Determining a first steady-state value based on a reactive compensation characteristic parameter and a first impedance voltage drop parameter;

[0022] A second steady-state value is determined based on the reactive power compensation characteristic parameter and the second impedance voltage drop parameter.

[0023] In combination with the first aspect, in some implementations, determining the operating pumping power of the variable speed unit based on the first steady-state value and the second steady-state value includes:

[0024] Determine the current output power of the wind turbine device and the redundant power of the power grid system, wherein the redundant power of the power grid system is the difference between the standard power of the power grid system and the current power of the power grid system;

[0025] The operating pumping power of the variable speed unit is determined based on the first steady-state value, the second steady-state value, the redundant power of the power grid system and the current output power of the wind turbine equipment.

[0026] In combination with the first aspect, in some implementations, determining the operating pumping power of the variable speed unit based on the first steady-state value, the second steady-state value, the redundant power of the power grid system, and the current output power of the wind turbine device includes:

[0027] If the redundant power of the power grid system is greater than or equal to 0, and the current output power of the fan equipment is greater than the redundant power of the power grid system, the calculated operating pumping power for:

[0028] ;

[0029] in, is the current output power of the fan equipment, is the first steady-state value, is the second steady-state value, Provides redundant power for the grid system.

[0030] In combination with the first aspect, in some implementations, determining the operating pumping power of the variable speed unit based on the first steady-state value and the second steady-state value further includes:

[0031] Determine the maximum operating power of the variable speed unit;

[0032] The calculated operating pumping power of the variable speed unit is compared with the maximum operating power of the variable speed unit. If the calculated operating pumping power of the variable speed unit is greater than the maximum operating power of the variable speed unit, the maximum operating power of the variable speed unit is determined to be the operating pumping power of the variable speed unit.

[0033] In a second aspect, an embodiment of the present application provides a variable speed unit of a pumped storage power station, wherein the pumped storage power station is coupled with a wind farm and connected to a power grid system, and the variable speed unit of the pumped storage power station includes a controller, and the controller is configured as follows:

[0034] Obtaining power operation parameters of wind turbine equipment in the wind farm, and determining a first impedance voltage drop parameter when the wind turbine equipment is connected to the power grid and a second impedance voltage drop parameter when the wind turbine equipment is connected to a pumped storage power station based on the power operation parameters;

[0035] Determine a first steady-state value between the wind turbine device and the power grid system based on the first impedance voltage drop parameter, the first steady-state value is used to characterize the stable state of the connection between the wind turbine device and the power grid system; determine a second steady-state value between the wind turbine device and the variable speed unit based on the second impedance voltage drop parameter, the second steady-state value is used to characterize the stable state of the connection between the wind turbine device and the pumped-storage power station;

[0036] Based on the first steady-state value and the second steady-state value, the operating pumping power of the variable speed unit is determined.

[0037] Optionally, the controller is configured to:

[0038] Calculate the terminal voltage vector of the wind turbine device according to the voltage amplitude of the power grid and the rated terminal voltage of the wind turbine device;

[0039] Decompose the terminal voltage vector of the wind turbine equipment into components in the quadrature axis direction;

[0040] According to the quadrature-axis component of the fan equipment, the first impedance voltage drop parameter of the fan equipment is calculated.

[0041] Optionally, the controller is configured to:

[0042] Calculate the terminal voltage vector of the wind turbine device according to the voltage amplitude of the power grid and the rated terminal voltage of the wind turbine device;

[0043] Decompose the terminal voltage vector of the wind turbine equipment into components in the direct axis direction;

[0044] According to the direct axis component of the fan equipment, a second impedance voltage drop parameter of the fan equipment is calculated.

[0045] Optionally, the controller is configured to:

[0046] Obtain reactive power compensation characteristic parameters of wind turbine equipment;

[0047] Determining a first steady-state value based on a reactive compensation characteristic parameter and a first impedance voltage drop parameter;

[0048] A second steady-state value is determined based on the reactive power compensation characteristic parameter and the second impedance voltage drop parameter.

[0049] Optionally, the controller is configured to:

[0050] Determine the current output power of the wind turbine device and the redundant power of the power grid system, wherein the redundant power of the power grid system is the difference between the standard power of the power grid system and the current power of the power grid system;

[0051] The operating pumping power of the variable speed unit is determined based on the first steady-state value, the second steady-state value, the redundant power of the power grid system and the current output power of the wind turbine equipment.

[0052] Optionally, the controller is configured to:

[0053] If the redundant power of the power grid system is greater than or equal to 0, and the current output power of the fan equipment is greater than the redundant power of the power grid system, the calculated operating pumping power for:

[0054] ;

[0055] in, is the current output power of the fan equipment, is the first steady-state value, is the second steady-state value, Provides redundant power for the grid system.

[0056] Optionally, the controller is configured to:

[0057] Determine the maximum operating power of the variable speed unit;

[0058] The calculated operating pumping power of the variable speed unit is compared with the maximum operating power of the variable speed unit. If the calculated operating pumping power of the variable speed unit is greater than the maximum operating power of the variable speed unit, the maximum operating power of the variable speed unit is determined to be the operating pumping power of the variable speed unit.

[0059] In summary, the above method and device have the following technical effects:

[0060] A method for controlling a variable speed unit of a pumped storage power station is proposed in an embodiment of the present application. First, power operation parameters of a wind turbine device in a wind farm are obtained. Based on the power operation parameters, a first impedance voltage drop parameter when the wind turbine device is connected to a power grid and a second impedance voltage drop parameter when the wind turbine device is connected to a pumped storage power station are determined. Then, based on the first impedance voltage drop parameter, a first steady-state value between the wind turbine device and the power grid system is determined, the first steady-state value being used to characterize the stable connection state between the wind turbine device and the power grid system. Based on the second impedance voltage drop parameter, a second steady-state value between the wind turbine device and the variable speed unit is determined, the second steady-state value being used to characterize the stable connection state between the wind turbine device and the pumped storage power station. Finally, based on the first steady-state value and the second steady-state value, the operating pumping power of the variable speed unit is determined. The variable speed unit control method of the pumped storage power station proposed in the present application determines the first impedance voltage drop parameter when the fan equipment is connected to the power grid, and the second impedance voltage drop parameter when the fan equipment is connected to the pumped storage power station by utilizing the power operation parameters to determine the connection stability state between the fan equipment and the power grid system, or the fan equipment and the pumped storage power station. The power of the variable speed unit during operation and pumping is calculated through the connection stability state. While responding quickly, it avoids the problem of inaccurate pumping power calculation caused by interference with the power system and the occurrence of power grid oscillation peaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A schematic flow chart of a variable speed unit control method for a pumped storage power station proposed in this application. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] See also Figure 1 The present application proposes a variable speed unit control method for a pumped storage power station, wherein the pumped storage power station is coupled with a wind farm and connected to a power grid system, and the method comprises the following steps:

[0064] S101: Acquire power operation parameters of a wind turbine device in a wind farm, and determine a first impedance voltage drop parameter when the wind turbine device is connected to a power grid and a second impedance voltage drop parameter when the wind turbine device is connected to a pumped storage power station based on the power operation parameters.

[0065] It is understandable that for a wind farm and pumped storage power station combined system, the wind turbine is used to convert wind energy into electrical energy, and the pumped storage power station is used for reactive power compensation. In the wind farm, according to the requirements of the power grid, during the peak period of electricity consumption, the combined system needs to provide a certain amount of dynamic reactive power support to the power grid, at which time the power generated by the storage power station can be used for support.

[0066] Due to the existence of impedance voltage drop, the terminal voltage is affected to a certain extent, which in turn affects the synchronous stability of the wind turbine equipment. Therefore, the synchronization process requires that the impedance voltage drop is as small as possible. As for how to obtain the impedance voltage drop data of the wind turbine equipment and the power grid system, for example, the terminal voltage vector of the wind turbine equipment can be calculated according to the grid voltage amplitude and the rated value of the terminal voltage of the wind turbine equipment, and then the terminal voltage vector of the wind turbine equipment is decomposed into the components in the quadrature axis direction, and finally, the first impedance voltage drop parameter of the wind turbine equipment is calculated according to the quadrature axis components of the wind turbine equipment. It can be understood that since it is obtained by the terminal voltage vector of the wind turbine equipment, it is the impedance voltage drop of the wind turbine equipment relative to the entire power grid system and the pumped storage power station at this time. And since the process of the pumped storage power station in this embodiment is only for the pumping process, and there is no discharge process, the impedance voltage drop between the wind turbine equipment and the pumping equipment does not affect each other. The grid voltage amplitude can be obtained by offline equivalent calculation or online identification, and the rated value of the terminal voltage of the wind turbine equipment can be obtained by data query provided by the station owner. The terminal voltage vector of the wind turbine device is the difference between the grid voltage amplitude and the rated value of the terminal voltage of the wind turbine device.

[0067] The impedance voltage drop parameter is calculated using the motor voltage drop impedance method, that is, the terminal voltage vector of the fan device is divided by the terminal current of the fan device.

[0068] As for how to obtain the impedance voltage drop between the pumped storage power station and the wind turbine equipment, the same as the power grid system is that the terminal voltage vector of the wind turbine equipment is calculated according to the grid voltage amplitude and the terminal voltage rating of the wind turbine equipment, and the terminal voltage vector of the wind turbine equipment is decomposed into components in the direct axis direction. Finally, according to the direct axis components of the wind turbine equipment, the second impedance voltage drop parameter of the wind turbine equipment is calculated.

[0069] S102: Based on the first impedance voltage drop parameter, a first steady-state value between the wind turbine device and the power grid system is determined, and the first steady-state value is used to characterize the stable connection state between the wind turbine device and the power grid system. Based on the second impedance voltage drop parameter, a second steady-state value between the wind turbine device and the variable speed unit is determined, and the second steady-state value is used to characterize the stable connection state between the wind turbine device and the pumped-storage power station.

[0070] In this embodiment, the first steady-state value is used to characterize the connection stability state between the wind turbine device and the power grid system, and the second steady-state value is used to characterize the connection stability state between the wind turbine device and the pumped storage power station. Taking the first steady-state value as an example: if the steady-state value is equal to 100%, it indicates that the connection stability state between the wind turbine device and the power grid system is the most stable state; if the connection stability state between the wind turbine device and the power grid system is equal to 0, the connection stability state between the wind turbine device and the power grid system is the most unstable state, so the wind turbine device does not have any anti-interference ability. In actual production, the steady-state value is between 0 and 1, and the larger the steady-state value, the higher the stability.

[0071] To obtain the synchronous stability value of the current cycle of the power equipment, it is necessary to calculate according to the calculation formula of the synchronous stability value. In the specific calculation process, it is necessary to collect relevant operating data of the wind turbine equipment, such as voltage, current, power and other parameters. These data can be monitored and collected in real time through sensors installed on the power equipment. By obtaining these data, they can be substituted into the calculation formula of the synchronous stability value, and through a series of mathematical operations, the synchronous stability value of the current cycle of the power equipment can be finally obtained.

[0072] It is worth noting that the calculation of the synchronous stability value is not a one-time job, but needs to be performed regularly. This is because the operating status of power equipment will be affected by many factors, such as load changes, environmental factors, etc. Changes in these factors may cause changes in the synchronous stability value of power equipment.

[0073] In some implementations, the power facilities are generally also provided with reactive compensation devices, etc. According to the requirements of the power grid, the wind farm needs to provide a certain amount of dynamic reactive support to the power grid during the fault. The reactive compensation device compensates the reactive power of the wind farm or the energy storage power station grid connection point faster than directly connecting to the power grid system, so the electric energy of the energy storage power station or the wind farm also needs to be coordinated and operated by the reactive compensation device. Therefore, as an implementation method, when characterizing the steady-state value, the reactive compensation situation also needs to be considered. Specifically, the reactive compensation characteristic parameters of the wind turbine equipment can be obtained, and then the first steady-state value can be determined based on the reactive compensation characteristic parameters and the first impedance voltage drop parameters, and the second steady-state value can be determined based on the reactive compensation characteristic parameters and the second impedance voltage drop parameters. The reactive compensation characteristic parameters are used to characterize the transient fault ride-through capability of the wind farm or the energy storage power station. In this application, a reactive optimization function can be constructed, and the reactive compensation characteristic parameters of the centralized reactive compensation device can be obtained by solving the reactive optimization function online. Of course, in some other implementations, the impedance voltage drop of the reactive power compensation device corresponding to the wind turbine equipment or the reactive power compensation device corresponding to the variable speed unit may be used to characterize the connection stability state.

[0074] S103: Determine the operating pumping power of the variable speed unit based on the first steady-state value and the second steady-state value.

[0075] After the first steady-state value and the second steady-state value are determined, the pumping power of the variable speed unit can be adjusted more finely according to the first steady-state value and the second steady-state value. Specifically, step S103 may include the following steps:

[0076] S1031: Determine the current output power of the wind turbine device and the redundant power of the power grid system, wherein the redundant power of the power grid system is the difference between the standard power of the power grid system and the current power of the power grid system.

[0077] S1032: Determine the operating pumping power of the variable speed unit based on the first steady-state value, the second steady-state value, the redundant power of the power grid system and the current output power of the wind turbine device.

[0078] Specifically, in this embodiment, only the situation where the redundant power of the power grid system is greater than or equal to 0 and the current output power of the wind turbine device is greater than the redundant power of the power grid system is considered. At this time, the energy storage power station needs to intervene to adjust the power grid balance. The situation where the redundant power of the power grid system is less than 0 or the current output power of the wind turbine device is less than or equal to the redundant power of the power grid system does not require the intervention of the energy storage power station. The calculation method can be carried out using the following calculation formula:

[0079] ;

[0080] in, is the current output power of the fan equipment, is the first steady-state value, is the second steady-state value, Provides redundant power for the grid system.

[0081] In some embodiments, step S103 may also include the following steps:

[0082] S1034: Determine the maximum operating power of the variable speed unit.

[0083] It is understandable that in the process of power regulation, the maximum regulated power must be less than the maximum operating power of the variable speed unit. This is a hard condition. Therefore, after calculating the operating pumping power of the variable speed unit, the maximum operating power of the variable speed unit also needs to be determined.

[0084] It can be understood that by comparing the calculated operating pumping power of the variable speed unit with the maximum operating power of the variable speed unit, if the calculated operating pumping power of the variable speed unit is greater than the maximum operating power of the variable speed unit, the maximum operating power of the variable speed unit is determined as the operating pumping power of the variable speed unit. In this way, the energy storage power station can intervene with the maximum power while ensuring safety.

[0085] A method for controlling a variable speed unit of a pumped storage power station is proposed in an embodiment of the present application. First, power operation parameters of a wind turbine device in a wind farm are obtained. Based on the power operation parameters, a first impedance voltage drop parameter when the wind turbine device is connected to a power grid and a second impedance voltage drop parameter when the wind turbine device is connected to a pumped storage power station are determined. Then, based on the first impedance voltage drop parameter, a first steady-state value between the wind turbine device and the power grid system is determined, the first steady-state value being used to characterize the stable connection state between the wind turbine device and the power grid system. Based on the second impedance voltage drop parameter, a second steady-state value between the wind turbine device and the variable speed unit is determined, the second steady-state value being used to characterize the stable connection state between the wind turbine device and the pumped storage power station. Finally, based on the first steady-state value and the second steady-state value, the operating pumping power of the variable speed unit is determined. The variable speed unit control method of the pumped storage power station proposed in the present application determines the first impedance voltage drop parameter when the fan equipment is connected to the power grid, and the second impedance voltage drop parameter when the fan equipment is connected to the pumped storage power station by utilizing the power operation parameters to determine the connection stability state between the fan equipment and the power grid system, or the fan equipment and the pumped storage power station. The power of the variable speed unit during operation and pumping is calculated through the connection stability state. While responding quickly, it avoids the problem of inaccurate pumping power calculation caused by interference with the power system and the occurrence of power grid oscillation peaks.

[0086] Based on the same inventive concept, an embodiment of the present application provides a variable speed unit of a pumped storage power station, the pumped storage power station is coupled with a wind farm and connected to a power grid system, the variable speed unit of the pumped storage power station includes a controller, and the controller is configured as follows:

[0087] Obtaining power operation parameters of wind turbine equipment in the wind farm, and determining a first impedance voltage drop parameter when the wind turbine equipment is connected to the power grid and a second impedance voltage drop parameter when the wind turbine equipment is connected to a pumped storage power station based on the power operation parameters;

[0088] Determine a first steady-state value between the wind turbine device and the power grid system based on the first impedance voltage drop parameter, the first steady-state value is used to characterize the stable state of the connection between the wind turbine device and the power grid system; determine a second steady-state value between the wind turbine device and the variable speed unit based on the second impedance voltage drop parameter, the second steady-state value is used to characterize the stable state of the connection between the wind turbine device and the pumped-storage power station;

[0089] Based on the first steady-state value and the second steady-state value, the operating pumping power of the variable speed unit is determined.

[0090] Optionally, the controller is configured to:

[0091] Calculate the terminal voltage vector of the wind turbine device according to the voltage amplitude of the power grid and the rated terminal voltage of the wind turbine device;

[0092] Decompose the terminal voltage vector of the wind turbine equipment into components in the quadrature axis direction;

[0093] According to the quadrature axis component of the fan equipment, the first impedance voltage drop parameter of the fan equipment is calculated.

[0094] Optionally, the controller is configured to:

[0095] Calculate the terminal voltage vector of the wind turbine device according to the voltage amplitude of the power grid and the rated terminal voltage of the wind turbine device;

[0096] Decompose the terminal voltage vector of the wind turbine equipment into components in the direct axis direction;

[0097] According to the direct axis component of the fan equipment, a second impedance voltage drop parameter of the fan equipment is calculated.

[0098] Optionally, the controller is configured to:

[0099] Obtain reactive power compensation characteristic parameters of wind turbine equipment;

[0100] Determining a first steady-state value based on a reactive compensation characteristic parameter and a first impedance voltage drop parameter;

[0101] A second steady-state value is determined based on the reactive power compensation characteristic parameter and the second impedance voltage drop parameter.

[0102] Optionally, the controller is configured to:

[0103] Determine the current output power of the wind turbine device and the redundant power of the power grid system, wherein the redundant power of the power grid system is the difference between the standard power of the power grid system and the current power of the power grid system;

[0104] The operating pumping power of the variable speed unit is determined based on the first steady-state value, the second steady-state value, the redundant power of the power grid system and the current output power of the wind turbine equipment.

[0105] Optionally, the controller is configured to:

[0106] If the redundant power of the power grid system is greater than or equal to 0, and the current output power of the fan equipment is greater than the redundant power of the power grid system, the calculated operating pumping power for:

[0107] ;

[0108] in, is the current output power of the fan equipment, is the first steady-state value, is the second steady-state value, Provides redundant power for the grid system.

[0109] Optionally, the controller is configured to:

[0110] Determine the maximum operating power of the variable speed unit;

[0111] The calculated operating pumping power of the variable speed unit is compared with the maximum operating power of the variable speed unit. If the calculated operating pumping power of the variable speed unit is greater than the maximum operating power of the variable speed unit, the maximum operating power of the variable speed unit is determined to be the operating pumping power of the variable speed unit.

[0112] A method for controlling a variable speed unit of a pumped storage power station is proposed in an embodiment of the present application. First, power operation parameters of a wind turbine device in a wind farm are obtained. Based on the power operation parameters, a first impedance voltage drop parameter when the wind turbine device is connected to a power grid and a second impedance voltage drop parameter when the wind turbine device is connected to a pumped storage power station are determined. Then, based on the first impedance voltage drop parameter, a first steady-state value between the wind turbine device and the power grid system is determined, the first steady-state value being used to characterize the stable connection state between the wind turbine device and the power grid system. Based on the second impedance voltage drop parameter, a second steady-state value between the wind turbine device and the variable speed unit is determined, the second steady-state value being used to characterize the stable connection state between the wind turbine device and the pumped storage power station. Finally, based on the first steady-state value and the second steady-state value, the operating pumping power of the variable speed unit is determined. The variable speed unit control method of the pumped storage power station proposed in the present application determines the first impedance voltage drop parameter when the fan equipment is connected to the power grid, and the second impedance voltage drop parameter when the fan equipment is connected to the pumped storage power station by utilizing the power operation parameters to determine the connection stability state between the fan equipment and the power grid system, or the fan equipment and the pumped storage power station. The power of the variable speed unit during operation and pumping is calculated by the connection stability state. The method has high safety and avoids the problem of inaccurate pumping power caused by oscillation peaks when the power system is disturbed.

[0113] Based on the same inventive concept, an embodiment of the present application further proposes an electronic device, the electronic device comprising:

[0114] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the variable speed unit control method of the pumped storage power station according to the embodiment of the present application.

[0115] In addition, to achieve the above-mentioned purpose, an embodiment of the present application also proposes a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the variable speed unit control method of the pumped storage power station in the embodiment of the present application.

[0116] The following is a detailed introduction to the various components of electronic equipment:

[0117] The processor is the control center of the electronic device, which can be a processor or a general term for multiple processing elements. For example, the processor is one or more central processing units (CPUs), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention, such as one or more microprocessors (digital signal processors, DSPs), or one or more field programmable gate arrays (FPGAs).

[0118] Optionally, the processor can perform various functions of the electronic device by running or executing a software program stored in the memory, and calling data stored in the memory.

[0119] The memory is used to store the software program for executing the solution of the present invention, and the execution is controlled by the processor. The specific implementation method can refer to the above method embodiment and will not be repeated here.

[0120] Optionally, the memory may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory may be integrated with the processor, or may exist independently and be coupled to the processor through an interface circuit of the electronic device, which is not specifically limited in the embodiments of the present invention.

[0121] A transceiver is used to communicate with a network device or a terminal device.

[0122] Optionally, the transceiver may include a receiver and a transmitter, wherein the receiver is used to implement a receiving function, and the transmitter is used to implement a sending function.

[0123] Optionally, the transceiver may be integrated with the processor, or may exist independently and be coupled to the processor via an interface circuit of the router, which is not specifically limited in the embodiment of the present invention.

[0124] In addition, the technical effects of the electronic device can refer to the technical effects of the data transmission method in the above method embodiment, which will not be repeated here.

[0125] It should be understood that the processor in the embodiment of the present invention may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0126] It should also be understood that the memory in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0127] The above embodiments can be implemented in whole or in part by software, hardware (such as circuits), firmware or any other combination. When implemented by software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When a computer instruction or computer program is loaded or executed on a computer, a process or function according to an embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. Computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state hard disk.

[0128] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship, but it may also indicate an "and / or" relationship. Please refer to the context for specific understanding.

[0129] In the present invention, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0130] It should be understood that in various embodiments of the present invention, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0131] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

Claims

1. A variable speed unit control method for a pumped storage power station, characterized in that: The pumped storage power station is coupled with a wind farm and connected to a power grid system, and the method comprises: Acquire power operation parameters of the wind turbine equipment in the wind farm, and determine, based on the power operation parameters, a first impedance voltage drop parameter when the wind turbine equipment is connected to a power grid, and a second impedance voltage drop parameter when the wind turbine equipment is connected to the pumped-storage power station; Determine a first steady-state value between the wind turbine device and the power grid system based on the first impedance voltage drop parameter, the first steady-state value is used to characterize the stable state of the connection between the wind turbine device and the power grid system; determine a second steady-state value between the wind turbine device and the variable speed unit based on the second impedance voltage drop parameter, the second steady-state value is used to characterize the stable state of the connection between the wind turbine device and the pumped-storage power station; Determining the operating pumping power of the variable speed unit based on the first steady-state value and the second steady-state value; The method of obtaining power operation parameters of a wind turbine device in the wind farm and determining a first impedance voltage drop parameter when the wind turbine device is connected to a power grid and a second impedance voltage drop parameter when the wind turbine device is connected to the pumped storage power station based on the power operation parameters includes: Calculate the terminal voltage vector of the wind turbine device according to the voltage amplitude of the power grid and the rated terminal voltage of the wind turbine device; Decomposing the terminal voltage vector of the wind turbine device into a component in the quadrature axis direction and a component in the direct axis direction; Calculate the first impedance voltage drop parameter of the fan equipment according to the quadrature axis component of the fan equipment; According to the direct axis component of the fan equipment, a second impedance voltage drop parameter of the fan equipment is calculated.

2. A variable speed unit control method for a pumped storage power station according to claim 1, characterized in that: Determining a first steady-state value between the wind turbine device and the power grid system based on the first impedance voltage drop parameter, the first steady-state value being used to characterize a stable connection state between the wind turbine device and the power grid system; determining a second steady-state value between the wind turbine device and the variable speed unit based on the second impedance voltage drop parameter, the second steady-state value being used to characterize a stable connection state between the wind turbine device and the pumped-storage power station, including: Obtaining reactive power compensation characteristic parameters of the wind turbine equipment; Determining the first steady-state value based on the reactive compensation characteristic parameter and the first impedance voltage drop parameter; The second steady-state value is determined based on the reactive compensation characteristic parameter and the second impedance voltage drop parameter.

3. A variable speed unit control method for a pumped storage power station according to claim 2, characterized in that: Determining the operating pumping power of the variable speed unit based on the first steady-state value and the second steady-state value includes: Determine the current output power of the wind turbine device and the redundant power of the power grid system, wherein the redundant power of the power grid system is the difference between the standard power of the power grid system and the current power of the power grid system; The operating pumping power of the variable speed unit is determined based on the first steady-state value, the second steady-state value, the redundant power of the power grid system and the current output power of the wind turbine device.

4. A variable speed unit control method for a pumped storage power station according to claim 3, characterized in that: Determining the operating pumping power of the variable speed unit based on the first steady-state value, the second steady-state value, the redundant power of the power grid system and the current output power of the wind turbine device includes: If the redundant power of the power grid system is greater than or equal to 0, and the current output power of the fan device is greater than the redundant power of the power grid system, the operating pumping power W0 is calculated as: Among them, W f is the current output power of the wind turbine device, η1 is the first steady-state value, η2 is the second steady-state value, W r The power grid system has redundant power.

5. A variable speed unit control method for a pumped storage power station according to claim 4, characterized in that: Determining the operating pumping power of the variable speed unit based on the first steady-state value and the second steady-state value further includes: Determining the maximum operating power of the variable speed unit; The calculated operating pumping power of the variable speed unit is compared with the maximum operating power of the variable speed unit. If the calculated operating pumping power of the variable speed unit is greater than the maximum operating power of the variable speed unit, the maximum operating power of the variable speed unit is determined to be the operating pumping power of the variable speed unit.

6. A variable speed unit of a pumped storage power station, characterized in that: The pumped storage power station is coupled with a wind farm and connected to a power grid system. The variable speed unit of the pumped storage power station includes a controller, and the controller is configured as follows: Acquire power operation parameters of the wind turbine equipment in the wind farm, and determine, based on the power operation parameters, a first impedance voltage drop parameter when the wind turbine equipment is connected to a power grid, and a second impedance voltage drop parameter when the wind turbine equipment is connected to the pumped-storage power station; Determine a first steady-state value between the wind turbine device and the power grid system based on the first impedance voltage drop parameter, the first steady-state value is used to characterize the stable state of the connection between the wind turbine device and the power grid system; determine a second steady-state value between the wind turbine device and the variable speed unit based on the second impedance voltage drop parameter, the second steady-state value is used to characterize the stable state of the connection between the wind turbine device and the pumped-storage power station; Determining the operating pumping power of the variable speed unit based on the first steady-state value and the second steady-state value; The controller is configured to: Calculate the terminal voltage vector of the wind turbine device according to the voltage amplitude of the power grid and the rated terminal voltage of the wind turbine device; Decomposing the terminal voltage vector of the wind turbine device into a component in the quadrature axis direction and a component in the direct axis direction; Calculate the first impedance voltage drop parameter of the fan equipment according to the quadrature axis component of the fan equipment; According to the direct axis component of the fan equipment, a second impedance voltage drop parameter of the fan equipment is calculated.

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