Full-power variable-speed pumped storage unit control method, device, system and medium

Abstract

The present invention discloses a full-power variable-speed pumped storage unit control method, device, system and medium, the method comprising: obtaining the grid-side system frequency, calculating the deviation between the grid-side system frequency and the rated frequency of the grid-side system, and obtaining the frequency deviation; according to the frequency deviation, calculating the frequency regulation action amount based on the frequency regulation amount calculation method; according to the frequency regulation action amount and the load regulation process of the collaborative controller, calculating the unit power issuance instruction based on the frequency regulation amount superposition method; according to the unit power issuance instruction, based on the collaborative optimization combined with the current head information, by querying the unit power / efficiency / speed / head synergy curve, the unit optimal speed is obtained, and the frequency regulation process is issued. The present invention has a simple structure and clear logic, can automatically adjust the unit output according to the system frequency fluctuation, and avoid the situation where the unit load adjustment is inconsistent with the system frequency regulation demand, and can effectively achieve a rapid response to the frequency regulation demand of the new power system.

Description

Technical Field

[0001] The present invention relates to the technical field of pumped storage, and in particular to a control method, device, system and medium for a full-power variable-speed pumped storage unit. Background Art

[0002] During the construction of new power systems, a large number of renewable energy sources are connected to the power grid. Their inherent randomness, volatility, and intermittency bring great challenges to the power balance, safety and stability control of the power system, and there is an urgent need to improve the system regulation capability. As one of the best energy storage technologies, pumped storage has become one of the important means to improve the system regulation capability. In recent years, the state has successively issued a number of policies to support the development of pumped storage. Among them, full-power variable-speed pumped storage, as an important direction of variable-speed pumped storage, has the advantages of fast response speed, wide regulation range, strong reactive power support, and adjustable pumping power. It is very suitable for complementary joint power generation with renewable energy, especially in response to system active power and frequency fluctuations. However, domestic research on full-power variable-speed pumped storage has just started, especially for the relevant technology of how full-power variable-speed pumped storage units respond to system frequency regulation. Summary of the invention

[0003] The purpose of the present invention is to provide a full-power variable-speed pumped storage unit control method, device, system and medium to solve the current technical gap in the full-power variable-speed pumped storage unit responding to system frequency fluctuations.

[0004] The present invention is achieved through the following technical solutions:

[0005] In a first aspect, the present invention provides a full-power variable-speed pumped storage unit control method, the method comprising:

[0006] Obtaining the grid-side system frequency, calculating the deviation between the grid-side system frequency and the grid-side system rated frequency, and obtaining the frequency deviation; and calculating the frequency modulation action amount based on the frequency deviation and the frequency modulation amount calculation method;

[0007] According to the frequency regulation action amount and the load regulation process of the collaborative controller, the unit power sending instruction is calculated based on the frequency regulation amount superposition method;

[0008] According to the power instruction of the unit, based on collaborative optimization combined with the current head information, the optimal speed of the unit is obtained by querying the coordinated curve of unit power / efficiency / speed / head, and the frequency adjustment process is executed.

[0009] Furthermore, the frequency modulation amount calculation method is to compare the frequency deviation with a preset regulation dead zone to determine whether the frequency deviation exceeds the preset regulation dead zone, and calculate the frequency modulation action amount according to the comparison result.

[0010] Furthermore, the step of calculating the frequency modulation action amount according to different situations includes:

[0011] If |Δf|≤ε, the frequency regulation action amount ΔP=0, that is, the frequency fluctuation of the grid-side system is small at this time, and does not exceed the regulation dead zone, and the unit does not need to be regulated;

[0012] If Δf>+ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf-ε), that is, the grid-side system frequency is low at this time, and the unit needs to be adjusted upward;

[0013] If Δf<-ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf+ε), that is, the grid-side frequency of the system is too high at this time, and the unit needs to be adjusted downward;

[0014] Wherein, Δf is the frequency deviation, ε is the preset adjustment dead zone; e P is the unit adjustment rate.

[0015] Furthermore, the unit power sending instruction is calculated based on the frequency modulation amount superposition method, including:

[0016] Step A: If the cooperative controller is not in the process of load regulation at this time, the unit power sends the instruction P ref =P N +ΔP;

[0017] Step B: If the cooperative controller is in the process of load regulation, the frequency modulation amount superposition module will adjust the load according to the given power P N With the unit current power P g Compare and judge the load adjustment direction of the unit, and according to the matching of the load adjustment direction and the primary frequency regulation direction, the computer group power sends the instruction P ref ;

[0018] Among them, ΔP is the frequency modulation action amount, P N For a given power.

[0019] Furthermore, the specific steps of step B are:

[0020] If P N >P g , indicating that the unit is in the process of adding load. If the frequency regulation action amount ΔP>0, it means that the grid-side system frequency is low at this time, and the unit needs to adjust the power upward, so the unit power sends the instruction P ref =P N +ΔP; if the frequency regulation action amount ΔP < 0, it means that the grid-side system frequency is too high and the unit needs to adjust the power downward. At this time, the unit should stop load regulation and give priority to responding to the system frequency regulation demand, P ref =P g+ΔP;

[0021] If P N <P g , indicating that the unit is in the process of reducing load. If the frequency regulation action amount ΔP>0, it means that the grid-side system frequency is low at this time, and the unit needs to adjust the power upward. At this time, the unit should stop load regulation and give priority to responding to the system frequency regulation demand. P ref =P g +ΔP; if the frequency regulation action amount ΔP < 0, it means that the grid-side system frequency is too high and the unit needs to adjust the power downward, P ref =P N +ΔP;

[0022] Among them, P N For a given power, P g is the current power of the unit.

[0023] Furthermore, the sending and executing adjustment process determines the current operation mode of the unit when sending, including:

[0024] If the unit is currently in fast power mode, that is, the speed regulator in the speed control system adopts speed closed-loop control and the converter adopts power closed-loop control, then the unit's optimal speed n ref Send it to the speed regulator and send the unit power instruction P ref Send it to the converter;

[0025] If the unit is currently in fast frequency mode, that is, the speed regulator in the speed control system adopts power closed-loop control and the converter adopts speed closed-loop control, then the unit's optimal speed n ref Send it to the converter, and send the unit power instruction P ref Send it to the speed regulator.

[0026] In a second aspect, the present invention further provides a full-power variable-speed pumped-storage unit control device, which supports the full-power variable-speed pumped-storage unit control method; the device comprises:

[0027] A frequency deviation acquisition module, used to acquire the grid-side system frequency, calculate the deviation between the grid-side system frequency and the grid-side system rated frequency, and obtain the frequency deviation;

[0028] A frequency modulation amount calculation module, used to calculate the frequency modulation action amount based on the frequency deviation and the frequency modulation amount calculation method;

[0029] A frequency regulation amount superposition module is used to calculate the unit power sending instruction based on the frequency regulation amount superposition method according to the frequency regulation action amount and the load adjustment process of the collaborative controller;

[0030] The collaborative optimization module sends instructions according to the power of the unit, based on collaborative optimization combined with the current head information, obtains the optimal speed of the unit by querying the unit power / efficiency / speed / head coordination curve, and sends it to execute the frequency adjustment process.

[0031] Furthermore, the execution process of the frequency modulation amount calculation module is:

[0032] By comparing the frequency deviation with a preset regulation dead zone, determining whether the frequency deviation exceeds the preset regulation dead zone, and calculating the frequency regulation action amount according to the comparison result, including:

[0033] If |Δf|≤ε, the frequency regulation action amount ΔP=0, that is, the frequency fluctuation of the grid-side system is small at this time, and does not exceed the regulation dead zone, and the unit does not need to be regulated;

[0034] If Δf>+ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf-ε), that is, the grid-side system frequency is low at this time, and the unit needs to be adjusted upward;

[0035] If Δf<-ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf+ε), that is, the grid-side frequency of the system is too high at this time, and the unit needs to be adjusted downward;

[0036] Wherein, Δf is the frequency deviation, ε is the preset adjustment dead zone; e P is the unit adjustment rate.

[0037] In a third aspect, the present invention further provides a full-power variable-speed pumped-storage unit control system, the control system comprising the full-power variable-speed pumped-storage unit control device; the frequency modulation amount calculation module is arranged in the speed regulation system, and the speed regulation system also includes a speed regulator; the frequency modulation amount superposition module and the collaborative optimization module are arranged in the collaborative controller;

[0038] The full-power variable-speed pumped-storage unit control device is used to enable the full-power variable-speed pumped-storage unit to respond to the grid-side system frequency fluctuations and issue execution adjustment instructions to the speed regulator and converter;

[0039] The speed regulator is used to receive the execution instruction issued by the full-power variable-speed pumped-storage unit control device, and to regulate the speed of the pump turbine according to the execution instruction.

[0040] In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the full-power variable-speed pumped-storage unit control method is implemented.

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

[0042] The full-power variable-speed pumped-storage unit control method, device, system and medium of the present invention have a simple structure and clear logic. The unit output can be automatically adjusted according to the system frequency fluctuation, and the conflict between the unit load adjustment and the system frequency regulation demand can be avoided. The rapid response to the frequency regulation demand of the new power system can be effectively achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0044] Figure 1 It is an overall flow chart of the full-power variable-speed pumped storage unit control method of the present invention.

[0045] Figure 2 This is a schematic diagram of rapid frequency regulation of a full-power variable-speed pumped-storage unit in fast power mode in Example 1 of the present invention.

[0046] Figure 3 This is a schematic diagram of rapid frequency regulation of a full-power variable-speed pumped-storage unit in a rapid frequency mode according to Embodiment 2 of the present invention.

[0047] Figure 4 This is a block diagram of the frequency modulation amount calculation module of the present invention, that is, a schematic diagram of the frequency modulation amount calculation method.

[0048] Figure 5 It is a structural schematic diagram of the full-power variable-speed pumped storage unit control device of the present invention. DETAILED DESCRIPTION

[0049] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0050] Example 1

[0051] like Figure 1 , Figure 2 and Figure 4 As shown, Figure 1 It is the overall flow chart of the control method of full-power variable-speed pumped storage unit; Figure 2 It is a schematic diagram of fast frequency regulation of full-power variable-speed pumped storage unit in fast power mode; Figure 4 This is the block diagram of the frequency modulation calculation module, that is, the schematic diagram of the frequency modulation calculation method; Figure 1 , Figure 2 and Figure 4 , the detailed implementation steps of the method of the present invention in the fast power mode are described.

[0052] The full-power variable-speed pumped storage unit control method of the present invention comprises:

[0053] Step 1: Obtain the grid-side system frequency f, and calculate the grid-side system frequency f and the grid-side system rated frequency f N (usually 50Hz) deviation, we get the frequency deviation Δf, Δf = f N -f; input the frequency deviation Δf into the frequency modulation amount calculation module.

[0054] Step 2: According to the frequency deviation Δf, the frequency modulation amount calculation module calculates the frequency modulation action amount ΔP based on the frequency modulation amount calculation method;

[0055] In this embodiment, the frequency modulation amount calculation method is to compare the frequency deviation Δf with the preset regulation dead zone ±ε to determine whether the frequency deviation Δf exceeds the preset regulation dead zone, and calculate the frequency modulation action amount ΔP according to the comparison result.

[0056] Specifically, the step of calculating the frequency modulation action amount according to different situations includes:

[0057] If |Δf|≤ε, the frequency regulation action amount ΔP=0, that is, the frequency fluctuation of the grid-side system is small at this time, and does not exceed the regulation dead zone, and the unit does not need to be regulated;

[0058] If Δf>+ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf-ε), that is, the grid-side system frequency is low at this time, and the unit needs to be adjusted upward;

[0059] If Δf<-ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf+ε), that is, the grid-side frequency of the system is too high at this time, and the unit needs to be adjusted downward;

[0060] Wherein, Δf is the frequency deviation, ε is the preset adjustment dead zone; e P is the unit adjustment rate.

[0061] Step 3: Send the frequency modulation action amount ΔP obtained in step 2 to the frequency modulation amount superposition module in the collaborative controller. According to the frequency modulation action amount ΔP and the load adjustment process of the collaborative controller, the frequency modulation amount superposition module calculates the unit power sending instruction based on the frequency modulation amount superposition method; and sends the calculated unit power sending instruction P ref Transmitted to the collaborative optimization module; including:

[0062] Step A: If the cooperative controller is not in the process of load regulation at this time, the unit power sends the instruction P ref =P N +ΔP;

[0063] Step B: If the cooperative controller is in the process of load regulation, the frequency modulation amount superposition module will adjust the load according to the given power P N With the unit current power P g Compare and determine the load adjustment direction of the unit, and according to the matching of the load adjustment direction and the primary frequency regulation direction, perform the following steps to calculate the unit power sending instruction P ref ;

[0064] ①If P N >P g , indicating that the unit is in the process of adding load. If the frequency regulation action amount ΔP>0, it means that the grid-side system frequency is low at this time, and the unit needs to adjust the power upward, so the unit power sends the instruction P ref =P N +ΔP; if the frequency regulation action amount ΔP < 0, it means that the grid-side system frequency is too high and the unit needs to adjust the power downward. At this time, the unit should stop load regulation and give priority to responding to the system frequency regulation demand, P ref =P g +ΔP;

[0065] ②If P N <P g , indicating that the unit is in the process of reducing load. If the frequency regulation action amount ΔP>0, it means that the grid-side system frequency is low at this time, and the unit needs to adjust the power upward. At this time, the unit should stop load regulation and give priority to responding to the system frequency regulation demand. P ref =P g +ΔP; if the frequency regulation action amount ΔP < 0, it means that the grid-side system frequency is too high and the unit needs to adjust the power downward, P ref =P N +ΔP;

[0066] Among them, P N For a given power, P g is the current power of the unit.

[0067] Step C: Send the calculated unit power command P ref Transmit to the collaborative optimization module;

[0068] Step 4: According to the power of the unit, the collaborative optimization module sends instructions based on the collaborative optimization and current water head information, obtains the optimal speed of the unit by querying the unit power / efficiency / speed / water head synergy curve, and takes the optimal speed of the unit as the speed given n. ref Send it to the speed regulator and set the given power P ref It is sent to the converter to complete the frequency regulation process.

[0069] In summary, the present invention provides a full-power variable-speed pumped storage unit control method that can quickly respond to system frequency fluctuations. Since the full-power variable-speed unit has the advantages of fast response speed, the present invention can automatically adjust the unit output according to the system frequency fluctuation, and avoid the situation where the unit load adjustment conflicts with the system frequency regulation demand, which can effectively achieve a rapid response to the frequency regulation demand of the new power system, filling the technical gap of full-power unit parameter system frequency regulation.

[0070] Example 2

[0071] like Figure 1 , Figure 3 and Figure 4 As shown, Figure 1 It is the overall flow chart of the control method of full-power variable-speed pumped storage unit; Figure 3 This is a schematic diagram of the rapid frequency regulation of a full-power variable-speed pumped storage unit in the rapid frequency mode. Figure 4 This is the block diagram of the frequency modulation calculation module, that is, the schematic diagram of the frequency modulation calculation method; Figure 1 , Figure 3 and Figure 4 , the detailed implementation steps of the method of the present invention in the fast frequency mode are described.

[0072] The full-power variable-speed pumped storage unit control method of the present invention comprises:

[0073] Step 1: Obtain the grid-side system frequency f, and calculate the grid-side system frequency f and the grid-side system rated frequency f N (usually 50Hz) deviation, we get the frequency deviation Δf, Δf = f N -f; input the frequency deviation Δf into the frequency modulation amount calculation module.

[0074] Step 2: According to the frequency deviation Δf, the frequency modulation amount calculation module calculates the frequency modulation action amount ΔP based on the frequency modulation amount calculation method;

[0075] In this embodiment, the frequency modulation amount calculation method is to compare the frequency deviation Δf with the preset regulation dead zone ±ε to determine whether the frequency deviation Δf exceeds the preset regulation dead zone, and calculate the frequency modulation action amount ΔP according to the comparison result.

[0076] Specifically, the step of calculating the frequency modulation action amount according to different situations includes:

[0077] If |Δf|≤ε, the frequency regulation action amount ΔP=0, that is, the frequency fluctuation of the grid-side system is small at this time, and does not exceed the regulation dead zone, and the unit does not need to be regulated;

[0078] If Δf>+ε, then the frequency modulation action amount ΔP=(1 / e P)(Δf-ε), that is, the grid-side system frequency is low at this time, and the unit needs to be adjusted upward;

[0079] If Δf<-ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf+ε), that is, the grid-side frequency of the system is too high at this time, and the unit needs to be adjusted downward;

[0080] Wherein, Δf is the frequency deviation, ε is the preset adjustment dead zone; e P is the unit adjustment rate.

[0081] Step 3: Send the frequency modulation action amount ΔP obtained in step 2 to the frequency modulation amount superposition module in the collaborative controller. According to the frequency modulation action amount ΔP and the load adjustment process of the collaborative controller, the frequency modulation amount superposition module calculates the unit power sending instruction based on the frequency modulation amount superposition method; and sends the calculated unit power sending instruction P ref Transmitted to the collaborative optimization module; including:

[0082] Step A: If the cooperative controller is not in the process of load regulation at this time, the unit power sends the instruction P ref =P N +ΔP;

[0083] Step B: If the cooperative controller is in the process of load regulation, the frequency modulation amount superposition module will adjust the load according to the given power P N With the unit current power P g Compare and determine the load adjustment direction of the unit, and according to the matching of the load adjustment direction and the primary frequency regulation direction, perform the following steps to calculate the unit power sending instruction P ref ;

[0084] ①If P N >P g , indicating that the unit is in the process of adding load. If the frequency regulation action amount ΔP>0, it means that the grid-side system frequency is low at this time, and the unit needs to adjust the power upward, so the unit power sends the instruction P ref =P N +ΔP; if the frequency regulation action amount ΔP < 0, it means that the grid-side system frequency is too high and the unit needs to adjust the power downward. At this time, the unit should stop load regulation and give priority to responding to the system frequency regulation demand, P ref =P g +ΔP;

[0085] ②If P N <P g , indicating that the unit is in the process of reducing load. If the frequency regulation action amount ΔP>0, it means that the grid-side system frequency is low at this time, and the unit needs to adjust the power upward. At this time, the unit should stop load regulation and give priority to responding to the system frequency regulation demand. P ref =Pg +ΔP; if the frequency regulation action amount ΔP < 0, it means that the grid-side system frequency is too high and the unit needs to adjust the power downward, P ref =P N +ΔP;

[0086] Among them, P N For a given power, P g is the current power of the unit.

[0087] Step C: Send the calculated unit power command P ref Transmit to the collaborative optimization module;

[0088] Step 4: According to the power of the unit, the collaborative optimization module sends instructions based on the collaborative optimization and current water head information, obtains the optimal speed of the unit by querying the unit power / efficiency / speed / water head synergy curve, and takes the optimal speed of the unit as the speed given n. ref Send it to the converter and set the given power P ref It is sent to the speed regulator to complete the frequency regulation process.

[0089] Example 3

[0090] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that this embodiment provides a full-power variable-speed pumped-storage unit control device, which supports the full-power variable-speed pumped-storage unit control method described in embodiment 1; the device includes:

[0091] A frequency deviation acquisition module, used to acquire the grid-side system frequency, calculate the deviation between the grid-side system frequency and the grid-side system rated frequency, and obtain the frequency deviation;

[0092] A frequency modulation amount calculation module, used to calculate the frequency modulation action amount based on the frequency deviation and the frequency modulation amount calculation method;

[0093] A frequency regulation amount superposition module is used to calculate the unit power sending instruction based on the frequency regulation amount superposition method according to the frequency regulation action amount and the load adjustment process of the collaborative controller;

[0094] The collaborative optimization module sends instructions according to the power of the unit, based on collaborative optimization combined with the current head information, obtains the optimal speed of the unit by querying the unit power / efficiency / speed / head coordination curve, and sends it to execute the frequency adjustment process.

[0095] As a further implementation, the execution process of the frequency modulation amount calculation module is:

[0096] By comparing the frequency deviation with a preset regulation dead zone, determining whether the frequency deviation exceeds the preset regulation dead zone, and calculating the frequency regulation action amount according to the comparison result, including:

[0097] If |Δf|≤ε, the frequency regulation action amount ΔP=0, that is, the frequency fluctuation of the grid-side system is small at this time, and does not exceed the regulation dead zone, and the unit does not need to be regulated;

[0098] If Δf>+ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf-ε), that is, the grid-side system frequency is low at this time, and the unit needs to be adjusted upward;

[0099] If Δf<-ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf+ε), that is, the grid-side frequency of the system is too high at this time, and the unit needs to be adjusted downward;

[0100] Wherein, Δf is the frequency deviation, ε is the preset adjustment dead zone; e P is the unit adjustment rate.

[0101] The execution process of each module can be executed according to the process steps of the full-power variable-speed pumped storage unit control method described in Example 1, and will not be repeated one by one in this embodiment.

[0102] Example 4

[0103] like Figure 2 and Figure 3 As shown, the difference between this embodiment and embodiment 1 is that this embodiment provides a full-power variable-speed pumped storage unit control system, which includes the full-power variable-speed pumped storage unit control device; the frequency modulation amount calculation module is arranged in the speed regulation system, and the speed regulation system also includes a speed regulator; the frequency modulation amount superposition module and the collaborative optimization module are arranged in the collaborative controller;

[0104] The full-power variable-speed pumped-storage unit control device is used to enable the full-power variable-speed pumped-storage unit to respond to the grid-side system frequency fluctuations and issue execution adjustment instructions to the speed regulator and converter;

[0105] The speed regulator is used to receive the execution instruction issued by the full-power variable-speed pumped-storage unit control device, and to regulate the speed of the pump turbine according to the execution instruction.

[0106] in, Figure 1 and Figure 2 The lower part of the figure refers to the control part of the unit, that is, the control system (including a speed control system and a coordinated controller, the speed control system includes a speed regulator and a frequency regulation amount calculation module, and the coordinated controller includes a frequency regulation amount superposition module and a coordinated optimization module); Figure 1 and Figure 2 The upper part refers to the main engine part of the unit (pump turbine, generator and converter).

[0107] Therefore, the full-power variable-speed pumped-storage unit control system proposed in the present invention has a simple structure and clear logic. It can automatically adjust the unit output according to the system frequency fluctuation and avoid the conflict between the unit load adjustment and the system frequency regulation demand, and can effectively achieve rapid response to the frequency regulation demand of the new power system.

[0108] At the same time, the present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the full-power variable-speed pumped-storage unit control method is implemented.

[0109] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0110] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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.

[0111] 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.

[0112] 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.

[0113] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A full-power variable-speed pumped storage unit control method, characterized in that: The method includes: Obtaining the grid-side system frequency, calculating the deviation between the grid-side system frequency and the grid-side system rated frequency, and obtaining the frequency deviation; and calculating the frequency modulation action amount based on the frequency deviation and the frequency modulation amount calculation method; According to the frequency regulation action amount and the load regulation process of the collaborative controller, the unit power sending instruction is calculated based on the frequency regulation amount superposition method; According to the power command of the unit, based on collaborative optimization and combined with the current water head information, the optimal speed of the unit is obtained by querying the coordinated curve of unit power / efficiency / speed / water head, and the frequency adjustment process is issued; The frequency modulation amount calculation method is to compare the frequency deviation with the preset regulation dead zone to determine whether the frequency deviation exceeds the preset regulation dead zone, and calculate the frequency modulation action amount according to the comparison result; The step of calculating the frequency modulation action amount according to different situations includes: If |Δf|≤ε, the frequency regulation action amount ΔP=0, that is, the frequency fluctuation of the grid-side system does not exceed the regulation dead zone, and the unit does not need to be regulated; If Δf>+ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf-ε), that is, the grid-side system frequency is low at this time, and the unit needs to be adjusted upward; If Δf<-ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf+ε), that is, the grid-side frequency of the system is too high at this time, and the unit needs to be adjusted downward; Wherein, Δf is the frequency deviation, ε is the preset adjustment dead zone; e P is the unit adjustment rate.

2. The full-power variable-speed pumped storage unit control method according to claim 1, characterized in that: The method of calculating the unit power sending instruction based on the frequency modulation amount superposition method includes: Step A: If the cooperative controller is not in the process of load regulation at this time, the unit power sends the instruction P ref =P N +ΔP; Step B: If the cooperative controller is in the process of load regulation, the frequency modulation amount superposition module will adjust the load according to the given power P N With the unit current power P g Compare and judge the load adjustment direction of the unit, and according to the matching of the load adjustment direction and the primary frequency regulation direction, the computer group power sends the instruction P ref ; Among them, ΔP is the frequency modulation action amount, P N For a given power.

3. The full-power variable-speed pumped storage unit control method according to claim 2, characterized in that: The specific steps of step B are: If P N >P g , indicating that the unit is in the process of adding load. If the frequency regulation action amount ΔP>0, it means that the grid-side system frequency is low at this time, and the unit needs to adjust the power upward, so the unit power sends the instruction P ref =P N +ΔP; if the frequency regulation action amount ΔP < 0, it means that the grid-side system frequency is too high and the unit needs to adjust the power downward. At this time, the unit should stop load regulation and give priority to responding to the system frequency regulation demand, P ref =P g +ΔP; If P N <P g , indicating that the unit is in the process of reducing load. If the frequency regulation action amount ΔP>0, it means that the grid-side system frequency is low at this time, and the unit needs to adjust the power upward. At this time, the unit should stop load regulation and give priority to responding to the system frequency regulation demand. P ref =P g +ΔP; if the frequency regulation action amount ΔP < 0, it means that the grid-side system frequency is too high and the unit needs to adjust the power downward, P ref =P N +ΔP; Among them, P N For a given power, P g is the current power of the unit.

4. The full-power variable-speed pumped storage unit control method according to claim 3, characterized in that: The sending and executing adjustment process determines the current operation mode of the unit when sending, including: If the unit is currently in fast power mode, that is, the speed governor in the speed control system adopts speed closed-loop control and the converter adopts power closed-loop control, the unit's optimal speed is sent to the speed governor, and the unit's power sending instruction is sent to the converter; If the unit is currently in fast frequency mode, that is, the speed regulator in the speed control system adopts power closed-loop control and the converter adopts speed closed-loop control, the unit's optimal speed is sent to the converter, and the unit's power sending instruction is sent to the speed regulator.

5. Full-power variable-speed pumped storage unit control device, characterized in that: The device includes: A frequency deviation acquisition module, used to acquire the grid-side system frequency, calculate the deviation between the grid-side system frequency and the grid-side system rated frequency, and obtain the frequency deviation; A frequency modulation amount calculation module, used to calculate the frequency modulation action amount based on the frequency deviation and the frequency modulation amount calculation method; A frequency regulation amount superposition module is used to calculate the unit power sending instruction based on the frequency regulation amount superposition method according to the frequency regulation action amount and the load adjustment process of the collaborative controller; The collaborative optimization module issues instructions according to the power of the unit, obtains the optimal speed of the unit by querying the power / efficiency / speed / head coordination curve based on collaborative optimization combined with the current water head information, and issues the execution frequency adjustment process; The execution process of the frequency modulation amount calculation module is: By comparing the frequency deviation with a preset regulation dead zone, determining whether the frequency deviation exceeds the preset regulation dead zone, and calculating the frequency regulation action amount according to the comparison result, including: If |Δf|≤ε, the frequency regulation action amount ΔP=0, that is, the frequency fluctuation of the grid-side system does not exceed the regulation dead zone, and the unit does not need to be regulated; If Δf>+ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf-ε), that is, the grid-side system frequency is low at this time, and the unit needs to be adjusted upward; If Δf<-ε, then the frequency modulation action amount ΔP=(1 / e P )(Δf+ε), that is, the grid-side frequency of the system is too high at this time, and the unit needs to be adjusted downward; Wherein, Δf is the frequency deviation, ε is the preset adjustment dead zone; e P is the unit adjustment rate.

6. Full-power variable-speed pumped storage unit control system, characterized in that: The control system comprises a full-power variable-speed pumped storage unit control device as claimed in claim 5; the frequency modulation amount calculation module is arranged in the speed regulation system, and the speed regulation system also comprises a speed regulator; the frequency modulation amount superposition module and the collaborative optimization module are arranged in the collaborative controller; The full-power variable-speed pumped-storage unit control device is used to enable the full-power variable-speed pumped-storage unit to respond to the grid-side system frequency fluctuations and issue execution adjustment instructions to the speed regulator and converter; The speed regulator is used to receive the execution instruction issued by the full-power variable-speed pumped-storage unit control device, and to regulate the speed of the pump turbine according to the execution instruction.

7. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the full-power variable-speed pumped-storage unit control method as described in any one of claims 1 to 4 is implemented.

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