Active power control method and system for full-power pumped storage unit under multiple working conditions

Abstract

The invention discloses an active control method and system for a full-power pumped storage unit under multiple working conditions, and belongs to the technical field of active control. The method comprises the steps that a basic model of the full-power variable-speed pumped storage unit is built in an electromagnetic simulation environment; performing analog simulation operation on the basic model according to a power generation working condition coordination control strategy and a water pump working condition coordination control strategy to obtain operation data; and based on the operation data, an optimal rotating speed control strategy is determined, and active control is carried out on the full-power variable-speed pumped storage unit under multiple working conditions according to the optimal rotating speed control strategy. The method can combine the advantages of various control strategies to carry out coordinated control on the unit, and the full-power variable-speed pumped storage unit certainly plays an important role in the technical field of active and reactive active support of a novel power system.

Description

Technical Field

[0001] The present invention relates to the technical field of active power control, and more specifically, to an active power control method and system for a full-power pumped storage unit under multiple working conditions. Background Art

[0002] In recent years, with the large-scale access of intermittent renewable energy sources such as wind power and photovoltaic power generation, their proportion in the power grid has been increasing, which has posed a great challenge to the safe and stable operation of the power grid. The frequency control of the power grid, especially the frequency control at night, has become more difficult. The high requirements for power grid frequency control and the lack of frequency control means, especially the lack of refined control means, form a contradiction. New energy power generation has strong volatility, intermittency, and randomness, and its ability to support the safety and stability of the power grid is weak.

[0003] Pumped storage is currently the most mature, economical and cleanest energy storage method. It has the functions of peak load regulation, frequency regulation and emergency standby. Pumped storage power stations play an outstanding role in peak load regulation and ensuring stable operation of power grids. However, traditional fixed-speed pumped storage units can only pump water at full load under pumping conditions and cannot adjust power according to system needs. Therefore, they cannot meet the requirements of fast and accurate frequency regulation of the power grid. Compared with fixed-speed units, the biggest difference between variable-speed units and fixed-speed units is that the units can operate steplessly within a certain range near the rated synchronous speed, realizing adjustable pumping power, which has practical significance both in improving the safe and stable operation level of the power grid and improving resource utilization. Variable-speed pumped storage units can be divided into full-power type and double-fed type according to topological differences. The former is connected to the power grid through back-to-back AC / DC converters, and its converter capacity is usually similar to the unit capacity. With the development of high-power power electronic device technology, domestic variable-speed pumped storage unit technology has made great progress.

[0004] Although there are relatively many variable-speed pumped-storage units put into operation internationally, there are few literatures introducing the actual operating characteristics of variable-speed pumped-storage units. Most of them are based on digital simulation or hardware operating characteristics obtained in environmental tests. There is little introduction to the start-up and commissioning technology of full-power variable-speed pumped-storage units. Summary of the invention

[0005] In view of the above problems, the present invention proposes a method for controlling active power of a full-power pumped storage unit under multiple working conditions, comprising:

[0006] Build a basic model of a full-power variable-speed pumped storage unit in an electromagnetic simulation environment;

[0007] Using the power generation condition coordination control strategy and the water pump condition coordination control strategy, the basic model is simulated and operated to obtain operation data;

[0008] Based on the operating data, an optimal speed control strategy is determined, and the active power of the full-power variable-speed pumped-storage unit under multiple working conditions is controlled by the optimal speed control strategy.

[0009] Optionally, the coordinated control strategy for power generation conditions includes: a fast power control mode and a fast frequency control mode.

[0010] Optionally, the pump operating condition coordination control strategy includes: fixed guide vane opening variable speed control strategy.

[0011] Optionally, a fixed guide vane opening variable speed control strategy includes: during the water pump startup process, directly starting with water by coordinating the speed increase and opening the guide vanes in stages, and the water pump shutdown process is the opposite of the water pump startup process.

[0012] Optionally, determining an optimal speed control strategy based on the operating data includes:

[0013] Based on the operating data, the characteristic curves of turbine operation and water pump operation are determined; based on the characteristic curves, the functional relationship between the optimal speed, guide vane opening, active power and water head of the full-power variable-speed pumped-storage unit is determined; based on the functional relationship, the optimal speed control strategy is determined.

[0014] Optional, the functional relationship is as follows:

[0015]

[0016] Among them, n gref1 and n gref2 are the optimal unit speed instructions corresponding to power control and guide vane opening control, respectively, nopt1 is the functional relationship between the optimal speed of the unit and the power reference value and water head, f nopt2 is the functional relationship between the unit's optimal speed, guide vane opening, and water head, P gref is the active power, y is the measured value of the guide vane opening, and H is the head.

[0017] Optional, optimal speed control strategy, as follows:

[0018] When the full-power variable-speed pumped storage unit adopts constant power control, the speed reference value is n gref1 Sure;

[0019] When the full-power variable-speed pumped storage unit adopts fixed guide vane opening control, the speed reference value is n gref2 Sure;

[0020] Deadband limits are introduced in the power reference, guide vane opening and water head signals.

[0021] On the other hand, the present invention also proposes an active power control system for a full-power pumped storage unit under multiple working conditions, comprising:

[0022] Build a model unit to build a basic model of a full-power variable-speed pumped storage unit in an electromagnetic simulation environment;

[0023] A simulation operation unit, used to simulate and operate the basic model according to the power generation condition coordination control strategy and the water pump condition coordination control strategy to obtain operation data;

[0024] A control unit is used to determine an optimal speed control strategy based on the operating data, and to perform active control of the full-power variable-speed pumped-storage unit under multiple operating conditions using the optimal speed control strategy.

[0025] Optionally, the coordinated control strategy for power generation conditions includes: a fast power control mode and a fast frequency control mode.

[0026] Optionally, the pump operating condition coordination control strategy includes: fixed guide vane opening variable speed control strategy.

[0027] Optionally, a fixed guide vane opening variable speed control strategy includes: during the water pump startup process, directly starting with water by coordinating the speed increase and opening the guide vanes in stages, and the water pump shutdown process is the opposite of the water pump startup process.

[0028] Optionally, determining an optimal speed control strategy based on the operating data includes:

[0029] Based on the operating data, the characteristic curves of turbine operation and water pump operation are determined; based on the characteristic curves, the functional relationship between the optimal speed, guide vane opening, active power and water head of the full-power variable-speed pumped-storage unit is determined; based on the functional relationship, the optimal speed control strategy is determined.

[0030] Optional, the functional relationship is as follows:

[0031]

[0032] Among them, n gref1 and n gref2 are the optimal unit speed instructions corresponding to power control and guide vane opening control, respectively, nopt1 is the functional relationship between the optimal speed of the unit and the power reference value and water head, f nopt2 is the functional relationship between the unit's optimal speed, guide vane opening, and water head, P gref is the active power, y is the measured value of the guide vane opening, and H is the head.

[0033] Optional, optimal speed control strategy, as follows:

[0034] When the full-power variable-speed pumped storage unit adopts constant power control, the speed reference value is n gref1 Sure;

[0035] When the full-power variable-speed pumped storage unit adopts fixed guide vane opening control, the speed reference value is n gref2 Sure;

[0036] Deadband limits are introduced in the power reference, guide vane opening and water head signals.

[0037] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0038] a processor for executing one or more programs;

[0039] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0040] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention provides a method for active control of a full-power pumped storage unit under multiple working conditions, including: building a basic model of a full-power variable-speed pumped storage unit in an electromagnetic simulation environment; simulating and operating the basic model with a coordinated control strategy for power generation conditions and a coordinated control strategy for water pump conditions to obtain operating data; determining an optimal speed control strategy based on the operating data, and performing active control of the full-power variable-speed pumped storage unit under multiple working conditions with the optimal speed control strategy. The present invention can coordinate the control of the unit by combining the advantages of multiple control strategies, and the full-power variable-speed pumped storage unit will surely play an important role in the field of active and reactive active support technology for new power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a flow chart of the method of the present invention;

[0044] Figure 2 This is a model diagram of an electromagnetic simulation pumped storage unit according to an embodiment of the method of the present invention;

[0045] Figure 3 Schematic diagram of control modes of a full-power variable-speed pumped storage unit under different working conditions according to an embodiment of the method of the present invention;

[0046] Figure 4 is a schematic diagram of optimal operating speed control of an embodiment of the method of the present invention;

[0047] Figure 5 It is a schematic diagram of the response characteristics of the unit during the variable speed power generation startup and load regulation process of the method embodiment of the present invention;

[0048] Figure 6 is a schematic diagram of the response characteristics of the unit during the rapid power step regulation process of the method embodiment of the present invention;

[0049] Figure 7 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0050] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0051] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0052] Embodiment 1:

[0053] The present invention proposes a method for controlling active power of a full-power pumped storage unit under multiple working conditions, such as Figure 1 As shown, including:

[0054] Step 1: Build a basic model of a full-power variable-speed pumped storage unit in an electromagnetic simulation environment;

[0055] Step 2: Using the power generation condition coordination control strategy and the water pump condition coordination control strategy, simulate and operate the basic model to obtain operation data;

[0056] Step 3: Based on the operating data, determine an optimal speed control strategy, and use the optimal speed control strategy to perform active control on the full-power variable-speed pumped-storage unit under multiple operating conditions.

[0057] Among them, the coordinated control strategy of power generation conditions includes: fast power control mode and fast frequency control mode.

[0058] Among them, the coordinated control strategy of the water pump operating conditions includes: fixed guide vane opening variable speed control strategy.

[0059] Among them, the fixed guide vane opening variable speed control strategy includes: during the water pump starting process, directly starting with water by coordinating the speed increase and opening the guide vanes in stages, and the water pump shutdown process is the opposite of the water pump starting process.

[0060] Wherein, determining the optimal speed control strategy based on the operating data includes:

[0061] Based on the operating data, the characteristic curves of turbine operation and water pump operation are determined; based on the characteristic curves, the functional relationship between the optimal speed, guide vane opening, active power and water head of the full-power variable-speed pumped-storage unit is determined; based on the functional relationship, the optimal speed control strategy is determined.

[0062] Among them, the relationship between the functional relationship is as follows:

[0063]

[0064] Among them, n gref1 and n gref2 are the optimal unit speed instructions corresponding to power control and guide vane opening control, respectively, nopt1 is the functional relationship between the optimal speed of the unit and the power reference value and water head, f nopt2 is the functional relationship between the unit's optimal speed, guide vane opening, and water head, P gref is the active power, y is the measured value of the guide vane opening, and H is the head.

[0065] Among them, the optimal speed control strategy is as follows:

[0066] When the full-power variable-speed pumped storage unit adopts constant power control, the speed reference value is n gref1 Sure;

[0067] When the full-power variable-speed pumped storage unit adopts fixed guide vane opening control, the speed reference value is n gref2 Sure;

[0068] Deadband limits are introduced in the power reference, guide vane opening and water head signals.

[0069] The present invention is described in detail below in conjunction with the specific implementation process:

[0070] Faced with the current domestic problem of no case to rely on, the present invention builds a basic model of a full-power variable-speed pumped storage unit in an electromagnetic simulation environment, such as Figure 1 As shown in the figure, based on the field measured data of a 5MW full-power variable-speed pumped-storage unit in a power station, the basic characteristics under power generation and water pump conditions are given, in order to provide a reference for the construction, commissioning and operation of variable-speed pumped-storage units in my country.

[0071] Coordinated control strategy for power generation conditions:

[0072] Under power generation conditions, the main research is on the power and frequency (speed) coordination control strategy between the converter and the speed regulator. According to the different power and frequency (speed) control positioning of the unit, two control modes are adopted under power generation conditions, namely, fast power control mode and fast frequency control mode. Figure 3 As shown:

[0073] Figure 3 Middle: P gref 、n gref ,y ref and P g 、n g , y are active power, unit speed, guide vane opening reference value and its measured value respectively; V g 、V gref are the actual value and reference value of the terminal voltage respectively; Vdc, V dcref are the actual value and reference value of the converter DC voltage respectively; Q R , Q Rref are the actual reactive power value and reference value of RSC respectively; Q I , Q Iref are the actual value and reference value of reactive power of GSC respectively; V I 、V Iref are the actual voltage value and reference value of GSC respectively; Tm is the mechanical torque. When the fast power control mode is adopted under power generation conditions, RSC controls the unit power, GSC controls the DC voltage, and the speed governor controls the unit frequency (speed). When the fast frequency control mode is adopted under power generation conditions, RSC controls the unit frequency (speed), GSC controls the DC voltage, and the speed governor controls the unit power.

[0074] Coordinated control strategy for water pump operating conditions:

[0075] The basic power characteristics of the water pump are shown in formula (1):

[0076]

[0077] Where: Q is the flow rate of the pump; H is the head; P is the power consumption of the pump; subscripts 1 and 2 represent the corresponding variables at different speeds. The power consumption of the pump is approximately proportional to the cube of the speed, so a large adjustment of the power can be achieved by a small adjustment of the speed. Similar to the power generation condition, the inverter controls the unit frequency (speed) to effectively ensure the rapidity and accuracy of the unit frequency control. Therefore, under the pump condition, the RSC controls the unit frequency (speed), the GSC controls the DC voltage, and the speed governor controls the guide vane opening. Therefore, under the pump condition, a fixed guide vane opening and variable speed are used to achieve rapid power regulation.

[0078] The range of head change under water pump working condition is small, between 159.8m and 165m. When the condition of the highest head corresponding to the lowest speed is met and the guide vane opening is within 18° to 30°, the maximum power change caused by each change of 2° in the guide vane opening (corresponding to a speed change of 5r / min) is about 0.2MW. To ensure safe and stable operation, multi-point fixed guide vane opening and fixed speed operation are adopted. For example, when the water pump power is 5.8MW, the fixed guide vane opening and fixed speed control strategy of y=20° and ng=1010r / min can be selected. At this time, the water pump power is about 5.8MW (related to the head). Considering factors such as operating efficiency and cavitation, the guide vane opening range is 18° to 30°, the interval is 2°, the water pump power is 5.6~6.6MW, and the efficiency is 86.8% to 91.9%. Under water pump working condition, the water pump power is strongly related to the speed control. In order to ensure the operating efficiency of the water pump, the fixed guide vane opening and variable speed control strategy is adopted. During the water pump startup process, the pump is started directly with water by coordinating the speed increase and guide vane opening in stages. The speed is increased first and then the guide vane is opened during the water pump startup process, and the water pump shutdown process is the opposite of the startup process.

[0079] The pump startup process is described as follows:

[0080] ① The guide vanes are fully closed and the unit speed is increased to 920r / min. After the pressure conditions are met, the guide vane opening is opened to 1.88°;

[0081] ② After the pressure is successfully built up, the unit speed is increased to 930r / min, and the guide vanes are opened to 7.4°;

[0082] ③ The unit speed is increased to 960r / min, and the guide vanes are opened to 11.08°;

[0083] ④ The unit speed is increased to 990r / min, and the guide vanes are opened to 16.76°;

[0084] ⑤ The unit speed is increased to 1010r / min, and the guide vanes are opened to 22.6°;

[0085] ⑥The unit speed increases to 1025r / min and the guide vanes are opened to 24.6°.

[0086] Optimal speed control strategy:

[0087] According to the comprehensive characteristic curves of turbine operation and pump operation, the functional relationship between the optimal speed, guide vane opening, active power and water head can be obtained, as shown in the formula.

[0088]

[0089] Where: n gref1 、n gref2 are the optimal unit speed instructions corresponding to power control and guide vane opening control respectively; fnopt1 、f nopt2 They are respectively the functional relationship between the optimal speed of the unit and the power reference value and the water head, and the functional relationship between the optimal speed of the unit and the guide vane opening and the water head.

[0090] Combining the unit active power reference and operating water head, the optimal operating speed under various working conditions can be obtained. The basic principle is as follows: Figure 4 shown.

[0091] When the unit adopts constant power control, the speed reference value is n gref1 When the unit adopts fixed guide vane opening control, the speed reference value is determined by n gref2 In order to prevent frequent speed adjustment caused by load and head fluctuations, dead zone limits are introduced in the power reference, guide vane opening and head signals.

[0092] Relying on the startup and commissioning of a full-power variable-speed pumped storage unit in a power station, the unit's functions and performance were fully tested. The following article focuses on the verification of the coordinated control strategy of the converter and speed regulator under the variable-speed operation of the unit.

[0093] (1) Variable speed generator start-up and load adjustment process:

[0094] The unit adopts the fast frequency control mode during variable speed power generation start and stop and normal operation. The measured waveforms during the unit startup and load adjustment process are as follows: Figure 5 shown.

[0095] After the unit starts at no-load and reaches the optimal speed under the current water head, it starts to carry load. The unit speed is adjusted smoothly during the startup process and steady-state operation with extremely high accuracy; the deviation between the target speed and the actual steady-state speed is less than 2r / min. During the load adjustment process, the actual power of the unit has harmonics and burrs, and because the power control sets a ±100kW dead zone, the actual power is usually less than the target power command.

[0096] Since the speed regulator controls the power, the power control is relatively slow, and the power control response speed is further reduced during the commissioning period to ensure safety, so the power is increased by 0.3MW in about 20s. Since the target speed follows the actual power of the unit to find the optimal control method, the target speed has a small rapid fluctuation during the load regulation process, but after the converter speed control is set with a certain slope and dead zone, the actual speed follows the actual power change smoothly, and the actual speed does not show obvious rapid oscillation.

[0097] (2) Rapid power regulation process:

[0098] In the fast power control mode, the converter controls the active power of the unit, and the speed regulator controls the speed of the unit. The response process of the unit during the power step regulation is as follows: Figure 6 shown.

[0099] In this mode, the speed regulator has a large dead zone, and it is difficult to maintain the actual speed at the optimal speed under the current head and current load. Figure 5 and Figure 6 It can be seen that the speed tracking and regulation performance of the unit in the fast frequency control mode is significantly better than that in the fast power control mode. Especially in the power regulation process, the speed of the unit shows obvious oscillation in the fast power control mode, and the recovery time is about 50s.

[0100] The power regulation performance of the unit in the fast power control mode is significantly better than that in the fast frequency control mode. In the fast power control mode, the power step is 0.2MW, which takes about 150ms and has good fast support performance for power regulation. However, considering its speed change characteristics, fast power regulation will cause large speed fluctuations or even oscillations, so it is not suitable to frequently perform large power step regulation.

[0101] Based on the field measured data of a 5MW full-power variable-speed pumped-storage unit in a power station, the basic model of the full-power variable-speed pumped-storage unit was built in an electromagnetic simulation environment, a coordinated control strategy and a start-up and debugging method of the full-power variable-speed pumped-storage unit were proposed, and the basic characteristics under power generation and water pump working conditions were given, in order to provide a reference for the construction, debugging and operation of variable-speed pumped-storage units in my country.

[0102] The fast power control mode is adopted in the power generation condition. The speed recovery is slow during the load adjustment process, but it has the ability of fast power adjustment in the 100 millisecond level. The fast frequency control mode is adopted in the power generation condition. It does not have the ability of fast power adjustment, but the unit can almost maintain the optimal speed during the load adjustment process, which is conducive to the safe and efficient operation of the unit. Under the water pump condition, the unit adopts the variable speed control strategy of fixed guide vane opening to ensure the safe and efficient operation of the unit.

[0103] The full-power variable-speed pumped storage unit GSC has a fast reactive power control capability of 100 milliseconds. Combining the advantages of multiple control strategies to coordinate the control of the unit, the full-power variable-speed pumped storage unit will surely play an important role in the field of active reactive power support technology for new power systems.

[0104] Embodiment 2:

[0105] The present invention also proposes an active power control system 200 for a full-power pumped storage unit under multiple working conditions, such as Figure 7 As shown, including:

[0106] A model building unit 201 is used to build a basic model of a full-power variable-speed pumped storage unit in an electromagnetic simulation environment;

[0107] The simulation operation unit 202 is used to simulate and operate the basic model according to the power generation condition coordination control strategy and the water pump condition coordination control strategy to obtain operation data;

[0108] The control unit 203 is used to determine an optimal speed control strategy based on the operating data, and to perform active control on the full-power variable-speed pumped-storage unit under multiple operating conditions using the optimal speed control strategy.

[0109] Among them, the coordinated control strategy of power generation conditions includes: fast power control mode and fast frequency control mode.

[0110] Among them, the coordinated control strategy of the water pump operating conditions includes: fixed guide vane opening variable speed control strategy.

[0111] Among them, the fixed guide vane opening variable speed control strategy includes: during the water pump starting process, directly starting with water by coordinating the speed increase and opening the guide vanes in stages, and the water pump shutdown process is the opposite of the water pump starting process.

[0112] Wherein, determining the optimal speed control strategy based on the operating data includes:

[0113] Based on the operating data, the characteristic curves of turbine operation and water pump operation are determined; based on the characteristic curves, the functional relationship between the optimal speed, guide vane opening, active power and water head of the full-power variable-speed pumped-storage unit is determined; based on the functional relationship, the optimal speed control strategy is determined.

[0114] Among them, the relationship between the functional relationship is as follows:

[0115]

[0116] Among them, n gref1 and n gref2 are the optimal unit speed instructions corresponding to power control and guide vane opening control, respectively, nopt1 is the functional relationship between the optimal speed of the unit and the power reference value and water head, f nopt2 is the functional relationship between the unit's optimal speed, guide vane opening, and water head, P gref is the active power, y is the measured value of the guide vane opening, and H is the head.

[0117] Among them, the optimal speed control strategy is as follows:

[0118] When the full-power variable-speed pumped storage unit adopts constant power control, the speed reference value is n gref1 Sure;

[0119] When the full-power variable-speed pumped storage unit adopts fixed guide vane opening control, the speed reference value is n gref2 Sure;

[0120] Deadband limits are introduced in the power reference, guide vane opening and water head signals.

[0121] The present invention can combine the advantages of multiple control strategies to coordinate the control of the unit, and the full-power variable-speed pumped storage unit will definitely play an important role in the field of active active and reactive support technology for new power systems.

[0122] Embodiment 3:

[0123] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0124] Embodiment 4:

[0125] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0126] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0127] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0128] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0129] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0130] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0131] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for controlling active power of a full-power pumped storage unit under multiple working conditions, characterized in that: include: Build a basic model of a full-power variable-speed pumped storage unit in an electromagnetic simulation environment; Using the power generation condition coordination control strategy and the water pump condition coordination control strategy, the basic model is simulated and operated to obtain operation data; Based on the operating data, an optimal speed control strategy is determined, and the active power of the full-power variable-speed pumped-storage unit under multiple operating conditions is controlled by the optimal speed control strategy.

2. The method according to claim 1, characterized in that The power generation condition coordinated control strategy includes: a fast power control mode and a fast frequency control mode.

3. The method according to claim 1, characterized in that The pump operating condition coordination control strategy includes: a fixed guide vane opening variable speed control strategy.

4. The method according to claim 3, characterized in that The fixed guide vane opening variable speed control strategy includes: during the water pump starting process, directly starting with water by coordinating the speed increase and opening the guide vanes in stages, and the water pump shutdown process is opposite to the water pump starting process.

5. The method according to claim 1, characterized in that Determining the optimal speed control strategy based on the operating data includes: Based on the operating data, the characteristic curves of turbine operation and water pump operation are determined; based on the characteristic curves, the functional relationship between the optimal speed, guide vane opening, active power and water head of the full-power variable-speed pumped-storage unit is determined; based on the functional relationship, the optimal speed control strategy is determined.

6. The method according to claim 5, characterized in that The relational expression of the functional relationship is as follows: Among them, n gref1 and n gref2 are the optimal unit speed instructions corresponding to power control and guide vane opening control, respectively, nopt1 is the functional relationship between the optimal speed of the unit and the power reference value and water head, f nopt2 is the functional relationship between the unit's optimal speed, guide vane opening, and water head, P gref is the active power, y is the measured value of the guide vane opening, and H is the head.

7. The method according to claim 1, characterized in that The optimal speed control strategy is as follows: When the full-power variable-speed pumped storage unit adopts constant power control, the speed reference value is n gref1 Sure; When the full-power variable-speed pumped storage unit adopts fixed guide vane opening control, the speed reference value is n gref2 Sure; Deadband limits are introduced in the power reference, guide vane opening and water head signals.

8. An active power control system for a full-power pumped storage unit under multiple working conditions, characterized in that: include: Build a model unit to build a basic model of a full-power variable-speed pumped storage unit in an electromagnetic simulation environment; A simulation operation unit, used to simulate and operate the basic model according to the power generation condition coordination control strategy and the water pump condition coordination control strategy to obtain operation data; A control unit is used to determine an optimal speed control strategy based on the operating data, and to perform active control on the full-power variable-speed pumped-storage unit under multiple operating conditions using the optimal speed control strategy.

9. The system according to claim 8, characterized in that The power generation condition coordinated control strategy includes: a fast power control mode and a fast frequency control mode.

10. The system according to claim 8, characterized in that The pump operating condition coordination control strategy includes: a fixed guide vane opening variable speed control strategy.

11. The system according to claim 10, characterized in that The fixed guide vane opening variable speed control strategy includes: during the water pump starting process, directly starting with water by coordinating the speed increase and opening the guide vanes in stages, and the water pump shutdown process is opposite to the water pump starting process.

12. The system according to claim 8, characterized in that Determining the optimal speed control strategy based on the operating data includes: Based on the operating data, the characteristic curves of turbine operation and water pump operation are determined; based on the characteristic curves, the functional relationship between the optimal speed, guide vane opening, active power and water head of the full-power variable-speed pumped-storage unit is determined; based on the functional relationship, the optimal speed control strategy is determined.

13. The system according to claim 12, characterized in that The relational expression of the functional relationship is as follows: Among them, n gref1 and n gref2 are the optimal unit speed instructions corresponding to power control and guide vane opening control, respectively, nopt1 is the functional relationship between the optimal speed of the unit and the power reference value and water head, f nopt2 is the functional relationship between the unit's optimal speed, guide vane opening, and water head, P gref is the active power, y is the measured value of the guide vane opening, and H is the head.

14. The system according to claim 8, characterized in that The optimal speed control strategy is as follows: When the full-power variable-speed pumped storage unit adopts constant power control, the speed reference value is n gref1 Sure; When the full-power variable-speed pumped storage unit adopts fixed guide vane opening control, the speed reference value is n gref2 Sure; Deadband limits are introduced in the power reference, guide vane opening and water head signals.

15. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 7 is implemented.

16. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 7 is implemented.

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