A method and device for operating a wind farm isolated grid heat supply system

Abstract

The application discloses a kind of wind farm isolated network heat supply system operation control method and device.Wind farm isolated network heat supply system operation control method includes based on the active stable operation state of wind farm isolated network heat supply system, determine the active output state of diesel generator, fan and network type energy storage unit;Based on the reactive stable operation state of wind farm isolated network heat supply system, determine the reactive output state of diesel generator, fan and network type energy storage unit;Based on the voltage stable operation state of wind farm isolated network heat supply system, determine the voltage output state of diesel generator, fan, network type energy storage unit and static var compensator;According to active output state, reactive output state and voltage output state, to complete the operation control of wind farm isolated network heat supply system.Frequency is adjusted quickly, to ensure that system frequency is stably operated, and the quick grid connection and operation of system are realized.

Description

Technical Field

[0001] This invention relates to the field of power technology, and in particular to an operation control method and device for an isolated grid heating system in a wind farm. Background Technology

[0002] Currently, grid-based energy storage is a research hotspot and key focus in power systems. Due to its crucial role in voltage support during power system faults and its ability to perform short-term frequency regulation and partial peak shaving, grid-based energy storage meets the needs of wind farms operating in islanded grids for voltage regulation, frequency regulation, and short-term power balance. Furthermore, grid-based energy storage can also serve as a startup function for islanded systems after unexpected outages. Current research on grid-based energy storage primarily focuses on its fault-tolerant operation, frequency regulation, and voltage regulation capabilities.

[0003] Meanwhile, the demand for isolated grid simulation of new energy systems has been increasing in recent years. If a grid failure leads to the disconnection of terminal power stations, but the actual power stations still require short-term power supply, it is crucial to improve the reliability of operation after a grid outage and enhance the operational economy of new energy power stations. Currently, isolated grids are mostly designed for short-term operational needs, while microgrid-based systems are designed based on long-term operational requirements. Isolated grid heating systems for wind farms that operate normally during other periods and require short-term power supply in winter have not yet been applied to actual systems. Therefore, considering the short-term winter heating needs of wind farms and integrating the multiple functions of grid-based energy storage—frequency regulation, voltage regulation, peak shaving, and transient support—designing an operation control method for isolated grid heating systems in wind farms has become essential. Summary of the Invention

[0004] This invention provides an operation control method and device for an isolated wind farm heating system, which enables rapid frequency adjustment, stable system frequency operation, and rapid grid connection and operation of the system.

[0005] According to one aspect of the present invention, an operation control method for an isolated wind farm heating system is provided, applied to an isolated wind farm heating system. The isolated wind farm heating system includes at least a grid-type energy storage unit, a wind turbine, a diesel generator, a static var compensator (SVC) unit, a high-voltage bus, a low-voltage bus, a first transformer unit, a second transformer unit, a third transformer unit, and a heating load. The grid-type energy storage unit, the heating load, and the diesel generator are respectively connected to the low-voltage bus. The wind turbine is connected to the high-voltage bus via the first transformer unit. The SVC unit is connected to the high-voltage bus via the second transformer unit. The high-voltage bus and the low-voltage bus are connected via the third transformer unit. The operation control method for the isolated wind farm heating system includes:

[0006] Based on the active stable operation status of the isolated grid heating system of the wind farm, the active output status of the diesel generator, the wind turbine and the grid-type energy storage unit is determined.

[0007] Based on the reactive power stable operation state of the isolated grid heating system of the wind farm, the reactive power output state of the diesel generator, the wind turbine and the grid-type energy storage unit is determined;

[0008] Based on the stable voltage operation of the wind farm isolated grid heating system, the voltage output status of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator unit is determined.

[0009] The operation control of the isolated grid heating system of the wind farm is completed based on the active power output state, the reactive power output state, and the voltage output state.

[0010] Optionally, before determining the active power output status of the diesel generator, the wind turbine, and the grid-type energy storage unit based on the active power stable operation status of the wind farm's isolated grid heating system, the method further includes:

[0011] Obtain the system active power of the isolated grid heating system of the wind farm;

[0012] Obtain the preset system active power;

[0013] Based on the active power stable operation state of the isolated grid heating system of the wind farm, the active power output state of the diesel generator, the wind turbine, and the grid-type energy storage unit is determined, including:

[0014] Based on the active power stable operation status of the wind farm isolated grid heating system, determine whether the active power of the system is less than or equal to the preset active power of the system;

[0015] If so, then the diesel generator, the wind turbine, and the grid-type energy storage unit are all controlled to be in an active power output state;

[0016] If not, then adjust the active power output of the diesel generator and the active power output of the grid-type energy storage unit in sequence.

[0017] Optionally, after controlling the diesel generator, the wind turbine, and the grid-type energy storage unit to all be in an active power output state, the method further includes:

[0018] Obtain the heating load power;

[0019] Determine whether the heating load power is greater than the system active power;

[0020] If so, then reduce the heating load power;

[0021] If not, continue with the step of controlling the diesel generator, the wind turbine, and the grid-type energy storage unit to be in an active power output state.

[0022] Optionally, after reducing the heating load power, the method further includes:

[0023] Obtain the heating load adjustment power and the preset heating load power;

[0024] Determine whether the adjusted heating load power is less than or equal to the preset heating load power;

[0025] If so, then stop the active power output state of the wind turbine, adjust the active power output state of the diesel generator, and adjust the active power output state of the grid-type energy storage unit.

[0026] If not, continue with the step of reducing the heating load power.

[0027] Optionally, adjusting the grid-type energy storage unit to an active power output state includes:

[0028] Obtain the unbalanced power of the isolated grid heating system of the wind farm;

[0029] The total inertia of the isolated grid heating system of the wind farm is obtained based on the unbalanced power.

[0030] The inertia of the grid-type energy storage is obtained based on the unbalanced power and the total inertia.

[0031] The active power output state of the grid-type energy storage unit is adjusted according to the grid-type energy storage inertia.

[0032] Optionally, obtaining the grid-type energy storage inertia based on the unbalanced power and the total inertia includes:

[0033] Based on the unbalanced power, obtain the first moment corresponding to when the unbalanced power is zero during the frequency change process;

[0034] The inertia of the grid-type energy storage is obtained based on the unbalanced power, the total inertia, and the first moment.

[0035] Optionally, based on the reactive power stable operation state of the wind farm's isolated grid heating system, the reactive power output state of the diesel generator, the wind turbine, and the grid-type energy storage unit is determined, including:

[0036] Based on the reactive power stability of the wind farm's isolated grid heating system, the response speed information of the diesel generator, the wind turbine, and the grid-type energy storage unit is obtained, wherein the response speed of the grid-type energy storage unit is greater than the response speed of the diesel generator, and the response speed of the diesel generator is greater than the response speed of the wind turbine.

[0037] The startup sequence information of the diesel generator, the wind turbine, and the grid-type energy storage unit is obtained based on the response speed information, wherein the startup sequence of the grid-type energy storage unit is higher than the startup sequence of the diesel generator, and the startup sequence of the diesel generator is higher than the startup sequence of the wind turbine.

[0038] The reactive power output status of the diesel generator, the wind turbine, and the grid-type energy storage unit is determined based on the startup sequence information.

[0039] Optionally, based on the voltage stability of the wind farm's isolated grid heating system, the voltage output states of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator are determined, including:

[0040] Based on the voltage stability of the wind farm's isolated grid heating system, the rated capacity of the grid-type energy storage unit, the rated transformer capacity of the wind turbine, the rated capacity of the wind turbine, and the rated capacity of the static var compensator unit are obtained.

[0041] The capacity correspondence is obtained based on the rated capacity of the grid-type energy storage, the rated capacity of the wind turbine transformer, the rated capacity of the wind turbine, and the rated capacity of the static var compensator.

[0042] The short-circuit currents of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator are obtained according to the capacity correspondence.

[0043] The voltage output states of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator are determined based on the short-circuit current.

[0044] Optionally, the capacity correspondence satisfies the formula:

[0045] ;

[0046] Among them, S e For grid-type energy storage rated capacity, S T Rated transformer capacity of the wind turbine, S W Rated capacity of the fan, S SVG This refers to the rated capacity for static var compensation.

[0047] According to another aspect of the present invention, an operation control device for a wind farm isolated grid heating system is provided, wherein the operation control device for the wind farm isolated grid heating system executes the operation control method for the wind farm isolated grid heating system comprising any one of the above aspects, the operation control device for the wind farm isolated grid heating system comprising:

[0048] The active power output status determination module is used to determine the active power output status of diesel generators, wind turbines and grid-type energy storage units based on the active power stable operation status of the wind farm isolated grid heating system.

[0049] The reactive power output status determination module is used to determine the reactive power output status of the diesel generator, the wind turbine, and the grid-type energy storage unit based on the reactive power stable operation status of the wind farm isolated grid heating system.

[0050] The voltage output status determination module is used to determine the voltage output status of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator unit based on the voltage stability operation status of the wind farm's isolated grid heating system.

[0051] The operation control completion module is used to complete the operation control of the wind farm isolated grid heating system based on the active power output status, the reactive power output status and the voltage output status.

[0052] The technical solution of this invention provides an operation control method for an isolated wind farm heating system. This method includes determining the active power output states of the diesel generator, wind turbine, and grid-type energy storage unit based on the active power stable operating state of the isolated wind farm heating system; determining the reactive power output states of the diesel generator, wind turbine, and grid-type energy storage unit based on the reactive power stable operating state of the isolated wind farm heating system; and determining the voltage output states of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator (SVC) unit based on the voltage stable operating state of the isolated wind farm heating system. Based on the active power output state, reactive power output state, and voltage output state, the method completes the operation control of the isolated wind farm heating system to achieve rapid frequency adjustment and rapid grid connection and operation of the heating system.

[0053] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 A flowchart of an operation control method for an isolated grid heating system in a wind farm, provided as an embodiment of the present invention;

[0056] Figure 2This is a schematic diagram of the structure of a wind farm isolated grid heating system provided in an embodiment of the present invention;

[0057] Figure 3 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention;

[0058] Figure 4 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention;

[0059] Figure 5 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention;

[0060] Figure 6 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention;

[0061] Figure 7 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention;

[0062] Figure 8 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention;

[0063] Figure 9 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention;

[0064] Figure 10 This is a schematic diagram of the operation control device for an isolated grid heating system in a wind farm, provided for an embodiment of the present invention. Detailed Implementation

[0065] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0066] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0067] Figure 1 This is a flowchart of an operation control method for an isolated grid heating system in a wind farm, provided by an embodiment of the present invention. This embodiment is applicable to the operation control of isolated grid heating systems in wind farms. The method can be executed by an operation control device for the isolated grid heating system in a wind farm. The operation control device for the isolated grid heating system in a wind farm can be implemented in hardware and / or software and can be configured in a power system. Figure 2 This is a schematic diagram of a wind farm isolated grid heating system provided in an embodiment of the present invention. The wind farm isolated grid heating system includes at least a grid-type energy storage unit 101, a wind turbine 102, a diesel generator 103, a static var compensator unit 104, a high-voltage busbar 105, a low-voltage busbar 106, a first transformer unit 107, a second transformer unit 108, a third transformer unit 109, and a heating load 110; the diesel generator 103, the wind turbine 102, and the grid-type energy storage unit 101 can... The grid-type energy storage unit 101 can function as both an active and reactive power source. It can also act as a load. The grid-type energy storage unit 101, the heating load 110, and the diesel generator 103 are connected to the low-voltage bus 106. The fan 102 is connected to the high-voltage bus 105 via the first transformer unit 107. The static var compensator 104 is connected to the high-voltage bus 105 via the second transformer unit 108. The high-voltage bus 105 and the low-voltage bus 106 are connected via a third transformer unit 109. Figure 1 As shown, the operation and control methods for isolated grid heating systems in wind farms include:

[0068] S101, based on the active stable operation status of the wind farm isolated grid heating system, determine the active output status of the diesel generator, wind turbine and grid-type energy storage unit.

[0069] When the wind farm's isolated grid heating system is operating stably, it requires active power from diesel generators, wind turbines, and grid-type energy storage units. The active power output of the diesel generators, wind turbines, and grid-type energy storage units can be adjusted according to whether the active power is excessive or insufficient, thereby improving the active power stability of the wind farm's isolated grid heating system.

[0070] S102, based on the reactive power stable operation state of the wind farm isolated grid heating system, determine the reactive power output state of the diesel generator, wind turbine and grid-type energy storage unit.

[0071] During the stable operation of the isolated grid heating system in the wind farm, diesel generators, wind turbines, and grid-type energy storage units are required to provide reactive power. The starting sequence can be adjusted according to the response speed of the diesel generators, wind turbines, and grid-type energy storage units to ensure the reactive power stability of the isolated grid heating system in the wind farm.

[0072] S103, based on the stable voltage operation of the wind farm's isolated grid heating system, determines the voltage output status of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator.

[0073] When the voltage of the wind farm isolated grid heating system is running stably, it requires diesel generators, wind turbines, grid-type energy storage units, and static var compensators (SVCs) to maintain it. The voltage stability of the system is closely related to the short-circuit capacity. The power sources that can provide power for short-circuit circuits are diesel generators, wind turbines, and grid-type energy storage units. At the same time, when the configuration of diesel generators, wind turbines, and grid-type energy storage units is insufficient, the capacity of SVCs needs to be introduced to suppress reactive power surges, thereby ensuring the voltage stability of the wind farm isolated grid heating system.

[0074] S104, based on the active power output status, reactive power output status, and voltage output status, completes the operation control of the wind farm's isolated grid heating system.

[0075] Among them, the operation and control of the isolated grid heating system of the wind farm needs to ensure the stable operation of the active power, the stable operation of the reactive power, and the stable operation of the voltage of the isolated grid heating system of the wind farm, so as to ensure that the isolated grid heating system of the wind farm can be quickly adjusted, quickly connected to the grid and operated.

[0076] This invention, in its embodiments, determines the active power output status of the diesel generator, wind turbine, and grid-type energy storage unit based on the active power stable operating status of the wind farm's isolated grid heating system; it also determines the reactive power output status of the diesel generator, wind turbine, and grid-type energy storage unit based on the reactive power stable operating status of the wind farm's isolated grid heating system; and it further determines the voltage output status of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator based on the voltage stable operating status of the wind farm's isolated grid heating system. Based on the active power output status, reactive power output status, and voltage output status, the operation control of the wind farm's isolated grid heating system is completed, enabling rapid frequency adjustment and rapid grid connection and operation of the heating system.

[0077] Optional, Figure 3 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention is shown below. Figure 3 As shown, the operation and control methods for isolated grid heating systems in wind farms include:

[0078] S201, obtain the system active power of the isolated grid heating system of the wind farm.

[0079] S202, Obtain the preset system active power.

[0080] S203. Based on the active power stability of the wind farm isolated grid heating system, determine whether the system active power is less than or equal to the preset system active power; if yes, proceed to step S204; if no, proceed to step S205.

[0081] S204 controls the diesel generator, wind turbine, and grid-type energy storage unit to be in an active output state.

[0082] S205, sequentially adjust the active power output of the diesel generator and the active power output of the grid-type energy storage unit.

[0083] In this invention, the active power provided to the system is preferentially supplied by diesel generators and wind turbines. The preset system active power can be set according to actual design requirements, and this embodiment does not impose specific limitations. When the active power of the isolated wind farm heating system is less than or equal to the preset system active power, the system active power is considered insufficient. In this case, the grid-type energy storage unit needs to be activated to act as an active power source, increasing the active power output, thereby ensuring that the diesel generator, wind turbine, and grid-type energy storage unit are all in an active power output state. When the active power of the isolated wind farm heating system is greater than the preset system active power, the system active power is considered excessive. In this case, the active power output of the diesel generator and the grid-type energy storage unit can be adjusted accordingly, that is, the active power output of the diesel generator is reduced first, and then the active power output of the grid-type energy storage unit is reduced.

[0084] S206, based on the reactive power stable operation state of the wind farm isolated grid heating system, determines the reactive power output state of the diesel generator, wind turbine and grid-type energy storage unit.

[0085] S207, based on the voltage stability of the wind farm's isolated grid heating system, determines the voltage output status of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator.

[0086] S208, based on the active power output status, reactive power output status, and voltage output status, completes the operation control of the wind farm's isolated grid heating system.

[0087] This invention provides an embodiment of the invention that acquires the active power of an isolated wind farm heating system; acquires a preset active power; determines whether the active power is less than or equal to the preset active power based on the stable active power operation of the isolated wind farm heating system, and adjusts the active power output of the diesel generator, wind turbine, or grid-type energy storage unit accordingly; determines the reactive power output of the diesel generator, wind turbine, and grid-type energy storage unit based on the stable reactive power operation of the isolated wind farm heating system; and determines the voltage output of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator based on the stable voltage operation of the isolated wind farm heating system. Based on the active power output, reactive power output, and voltage output states, the invention achieves operational control of the isolated wind farm heating system, enabling rapid frequency adjustment and rapid grid connection and operation of the heating system.

[0088] Figure 4 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention is shown below. Figure 4 As shown, the operation and control methods for isolated grid heating systems in wind farms include:

[0089] S301, obtain the system active power of the isolated grid heating system of the wind farm.

[0090] S302, obtain the preset system active power.

[0091] S303, based on the active power stability of the wind farm isolated grid heating system, determine whether the system active power is less than or equal to the preset system active power; if yes, proceed to step S304, otherwise proceed to step S308.

[0092] S304 controls the diesel generator, wind turbine, and grid-type energy storage unit to be in an active output state.

[0093] S305, obtain the heating load power.

[0094] S306, determine whether the heating load power is greater than the system active power; if yes, proceed to step S307; if no, proceed to step S304.

[0095] S307 reduces heating load power.

[0096] When the diesel generator, wind turbine, and grid-type energy storage unit are all in active output mode and all adjusted to maximum active output mode, if the heating load power is still greater than the system active power, then it is necessary to appropriately reduce the heating load power to ensure the active power balance of the system.

[0097] S308, sequentially adjusts the active power output of the diesel generator and the active power output of the grid-type energy storage unit.

[0098] S309, based on the reactive power stable operation status of the wind farm isolated grid heating system, determines the reactive power output status of the diesel generator, wind turbine and grid-type energy storage unit.

[0099] S310 determines the voltage output status of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator unit based on the stable voltage operation status of the wind farm's isolated grid heating system.

[0100] S311 is used to control the operation of the isolated grid heating system of the wind farm based on the active power output status, reactive power output status, and voltage output status.

[0101] This invention, in its embodiments, acquires the active power of an isolated wind farm heating system; acquires a preset active power; based on the stable active power operation of the isolated wind farm heating system, determines whether the active power is less than or equal to the preset active power, and then adjusts the active power output of the diesel generator, wind turbine, or grid-type energy storage unit; further, it compares and adjusts the active power and heating load power to ensure active power balance; based on the stable reactive power operation of the isolated wind farm heating system, it determines the reactive power output of the diesel generator, wind turbine, and grid-type energy storage unit; based on the stable voltage operation of the isolated wind farm heating system, it determines the voltage output of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator; and based on the active power output, reactive power output, and voltage output states, it completes the operation control of the isolated wind farm heating system to achieve rapid frequency adjustment and rapid grid connection and operation of the heating system.

[0102] Figure 5 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention is shown below. Figure 5 As shown, the operation and control methods for isolated grid heating systems in wind farms include:

[0103] S401, obtain the system active power of the isolated grid heating system of the wind farm.

[0104] S402, obtain the preset system active power.

[0105] S403, based on the active power stability of the wind farm isolated grid heating system, determine whether the system active power is less than or equal to the preset system active power; if yes, proceed to step S404; if no, proceed to step S411.

[0106] S404 controls the diesel generator, wind turbine, and grid-type energy storage unit to be in an active output state.

[0107] S405, obtain the heating load power.

[0108] S406, determine whether the heating load power is greater than the system active power; if yes, proceed to step S407; if no, proceed to step S404.

[0109] S407 reduces heating load power.

[0110] S408, obtain the heating load adjustment power and the preset heating load power.

[0111] S409, determine whether the heating load adjustment power is less than or equal to the preset heating load power; if yes, proceed to step S410; if no, proceed to step S407.

[0112] S410, stop the active power output state of the wind turbine, adjust the active power output state of the diesel generator, and adjust the active power output state of the grid-type energy storage unit.

[0113] In this process, after reducing the heating load power, the adjusted heating load power is obtained, and the preset heating load power is also obtained. The preset heating load power can be set according to actual design requirements. This embodiment of the invention does not impose specific limitations. When the heating load adjustment power is less than or equal to the preset heating load power, the minimum active power output of the fan cannot be guaranteed to be stable. The active power output state of the fan is stopped, and the active power output state of the diesel generator and the active power output state of the grid-type energy storage unit are adjusted to ensure stable active power operation of the system.

[0114] S411, sequentially adjust the active power output of the diesel generator and the active power output of the grid-type energy storage unit.

[0115] S412, based on the reactive power stable operation state of the wind farm isolated grid heating system, determines the reactive power output state of the diesel generator, wind turbine and grid-type energy storage unit.

[0116] S413, based on the voltage stability of the wind farm's isolated grid heating system, determines the voltage output status of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator.

[0117] S414, based on the active power output status, reactive power output status, and voltage output status, completes the operation control of the isolated grid heating system of the wind farm.

[0118] This invention, through a process of reducing the heating load power, obtains the adjusted heating load power and the preset heating load power, and determines whether the adjusted heating load power is less than or equal to the preset heating load power; thereby correspondingly stopping the active power output state of the wind turbine, adjusting the active power output state of the diesel generator, and adjusting the active power output state of the grid-type energy storage unit, thus ensuring the stable active power operation of the wind farm isolated grid heating system.

[0119] Figure 6 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention is shown below. Figure 6 As shown, the operation and control methods for isolated grid heating systems in wind farms include:

[0120] S501, obtain the system active power of the isolated grid heating system of the wind farm.

[0121] S502, obtain the preset system active power.

[0122] S503, based on the active power stability of the wind farm isolated grid heating system, determine whether the system active power is less than or equal to the preset system active power; if yes, proceed to step S504, otherwise proceed to step S515.

[0123] S504 controls the diesel generator, wind turbine, and grid-type energy storage unit to be in an active output state.

[0124] S505, obtain the heating load power.

[0125] S506, determine whether the heating load power is greater than the system active power; if yes, proceed to step S507; if no, proceed to step S504.

[0126] S507 reduces heating load power.

[0127] S508, obtains the heating load adjustment power and the preset heating load power.

[0128] S509, determine whether the heating load adjustment power is less than or equal to the preset heating load power; if yes, proceed to step S510; if no, proceed to step S507.

[0129] S510, stops the active power output of the wind turbine and adjusts the active power output of the diesel generator.

[0130] S511, obtains the unbalanced power of the isolated grid heating system of the wind farm.

[0131] S512, obtains the total inertia of the wind farm's isolated grid heating system based on unbalanced power.

[0132] The time corresponding to the frequency change is t0, and the frequency at t0 is f0, where f0 = 50Hz; the time corresponding to the minimum frequency is t1, and the frequency at t1 is fmin. The total inertia of the wind farm's isolated grid heating system can be obtained from the unbalanced power. Specifically, the total inertia Tsys of the wind farm's isolated grid heating system satisfies: Where: ΔP is the unbalanced power; Tsys is the total inertia of the wind farm's isolated grid heating system, which also satisfies the formula: Te is the inertia of the grid-type energy storage unit, Tc is the rotational inertia of the diesel generator, and Tdfig is the inertia of the wind turbine.

[0133] S513 obtains the inertia of grid-type energy storage based on unbalanced power and total inertia.

[0134] Where fmin is typically 49.5 Hz, substituting the above formula into the expression for total inertia yields... Furthermore, the energy Ee released by the grid-type energy storage unit during frequency reduction satisfies the formula: Therefore, Ee = 0.0199Te; according to the principle of system oscillation, considering only the diesel generator, the rotational speed oscillation frequency of the wind farm isolated grid heating system containing the grid-type energy storage unit satisfies... The moment of inertia of a typical diesel generator is Tc = 0.5s, leading to a rotational speed oscillation frequency of β = 21.1 rad / s. The system oscillation typically reaches its minimum value within 0.25 cycles, and the time to reach the minimum frequency is calculated to be 0.84s, i.e., t1 - t0 equals 0.84s. The power of the grid-type energy storage unit releasing energy Ee within 0.84s of frequency change in a wind farm isolated grid heating system can be calculated using the expression for total inertia, thus yielding the grid-type energy storage inertia. Pne represents the active power of a grid-type energy storage unit. However, in actual operation, the energy released by a grid-type energy storage unit must be less than the energy released by its rated power in the same amount of time. Meanwhile, the inertia and unbalanced power ΔP of the grid-type energy storage unit also satisfy: Due to the inherent capacity limitations of grid-type energy storage units, the grid-type energy storage inertia Te cannot be too large. An excessively large grid-type energy storage inertia Te would require a larger energy storage capacity. Furthermore, the resulting unbalanced power ΔP requires the energy storage to quell frequency oscillations in a short period of time. Therefore, the grid-type energy storage inertia Te of the grid-type energy storage unit must be large enough to provide sufficient energy in a short time and ensure the active power stability of the system operation.

[0135] S514 adjusts the active power output state of the grid-type energy storage unit according to the inertia of the grid-type energy storage.

[0136] Furthermore, based on the system's unbalanced power and the minimum frequency required by the system, while also considering the system's oscillation period, the inertia of the grid-type energy storage is reasonably set to meet the actual frequency changes of the system. The active power output state of the grid-type energy storage unit is adjusted to avoid the grid-type energy storage inertia exceeding the upper limit. This can ensure the stable operation of the system frequency while saving investment in the grid-type energy storage unit, thereby ensuring the active power stability of the system operation.

[0137] S515, sequentially adjusts the active power output of the diesel generator and the active power output of the grid-type energy storage unit.

[0138] S516, based on the reactive power stable operation state of the wind farm isolated grid heating system, determines the reactive power output state of the diesel generator, wind turbine and grid-type energy storage unit.

[0139] S517 determines the voltage output status of diesel generators, wind turbines, grid-type energy storage units, and static var compensators based on the stable voltage operation status of the wind farm's isolated grid heating system.

[0140] S518, based on the active power output status, reactive power output status, and voltage output status, completes the operation control of the isolated grid heating system of the wind farm.

[0141] This invention provides an embodiment of the invention that obtains the unbalanced power of an isolated wind farm heating system; obtains the total inertia of the isolated wind farm heating system based on the unbalanced power; obtains the inertia of the grid-type energy storage based on the unbalanced power and the total inertia; and adjusts the active power output state of the grid-type energy storage unit based on the grid-type energy storage inertia, thereby ensuring stable frequency operation and thus ensuring the active power stability of the system.

[0142] Figure 7 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention is shown below. Figure 7 As shown, the operation and control methods for isolated grid heating systems in wind farms include:

[0143] S601, obtain the system active power of the isolated grid heating system of the wind farm.

[0144] S602, obtain the preset system active power.

[0145] S603, based on the active power stability of the wind farm isolated grid heating system, determine whether the system active power is less than or equal to the preset system active power; if yes, proceed to step S604, otherwise proceed to step S616.

[0146] S604 controls the diesel generator, wind turbine, and grid-type energy storage unit to be in active power output mode.

[0147] S605, obtain the heating load power.

[0148] S606, determine whether the heating load power is greater than the system active power; if yes, proceed to step S607; if no, proceed to step S604.

[0149] S607 reduces heating load power.

[0150] S608, obtains the heating load adjustment power and the preset heating load power.

[0151] S609, determine whether the heating load adjustment power is less than or equal to the preset heating load power; if yes, proceed to step S610; if no, proceed to step S607.

[0152] S610, stops the active power output of the wind turbine and adjusts the active power output of the diesel generator.

[0153] S611, obtains the unbalanced power of the isolated grid heating system of the wind farm.

[0154] S612, obtain the total inertia of the wind farm isolated grid heating system based on the unbalanced power.

[0155] S613, based on the unbalanced power, obtain the first moment corresponding to when the unbalanced power is zero during the frequency change process.

[0156] Among them, the formula for calculating the unbalanced power ΔP of the wind farm isolated grid heating system with grid-type energy storage units satisfies the following when the frequency decreases: Wherein: P w (t) represents the active power of the wind turbine, P c (t) represents the active power of the diesel engine, P H (t) represents the active power of the heating load. During the frequency change process, the active power will reach the target active power at the first moment t. b This makes the unbalanced power ΔP of the entire system zero, at which point at the first time t b The third active power P of the corresponding grid-type energy storage unit ne (t b ),satisfy, In isolated grid heating systems of wind farms containing grid-type energy storage units, the time to reach the lowest frequency is short, resulting in a longer adjustment time for the active power of wind turbines, diesel engines, and heating loads. Consequently, these systems cannot function effectively during frequency adjustments. In practice, the active power adjustment process of the grid-type energy storage units is typically prioritized. According to the performance test curves of grid-type energy storage units, they can adjust their active power to the target level in approximately 0.4 seconds.

[0157] S614 obtains the inertia of the grid-type energy storage based on the unbalanced power, total inertia, and the first moment.

[0158] During the frequency change process, an acceleration area Sa is generated when the active power output reaches the first time point tb. Simultaneously, the active power output will generate a deceleration area Sd after the first moment tb. Where Pnef is the target energy storage active power. Therefore, combined with The active power output will generate a deceleration area Sd after the first moment tb, from which the inertia of the grid-type energy storage can be obtained. When the active power output of the grid-type energy storage unit is used to maintain the stable operation of the system, the grid-type energy storage unit can realize variable inertia adjustment due to the existence of virtual inertia. During the adjustment process, it is necessary to take into account the unbalanced power of the wind farm isolated grid heating system and the minimum frequency required by the system, so as to ensure the stable operation of the system frequency.

[0159] S615 adjusts the active power output state of the grid-type energy storage unit according to the inertia of the grid-type energy storage.

[0160] S616, sequentially adjusts the active power output of the diesel generator and the active power output of the grid-type energy storage unit.

[0161] S617, based on the reactive power stable operation state of the wind farm isolated grid heating system, determines the reactive power output state of the diesel generator, wind turbine and grid-type energy storage unit.

[0162] S618 determines the voltage output status of diesel generators, wind turbines, grid-type energy storage units, and static var compensators based on the stable voltage operation status of the wind farm's isolated grid heating system.

[0163] S619, based on the active power output status, reactive power output status, and voltage output status, completes the operation control of the isolated grid heating system of the wind farm.

[0164] The embodiments of the present invention obtain the first moment corresponding to the unbalanced power being zero during the frequency change process based on the unbalanced power; obtain the grid-type energy storage inertia based on the unbalanced power, total inertia and the first moment; thereby ensuring stable frequency operation and thus ensuring the active power stability of the system.

[0165] Figure 8 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention is shown below. Figure 8 As shown, the operation and control methods for isolated grid heating systems in wind farms include:

[0166] S701, obtain the system active power of the isolated grid heating system of the wind farm.

[0167] S702, obtain the preset system active power.

[0168] S703, based on the active power stable operation status of the wind farm isolated grid heating system, determine whether the system active power is less than or equal to the preset system active power; if yes, proceed to step S704, otherwise proceed to step S716.

[0169] S704 controls the diesel generator, wind turbine, and grid-type energy storage unit to be in an active output state.

[0170] S705, obtain the heating load power.

[0171] S706, determine whether the heating load power is greater than the system active power; if yes, proceed to step S707; if no, proceed to step S704.

[0172] S707 reduces heating load power.

[0173] S708, obtains the heating load adjustment power and the preset heating load power.

[0174] S709, determine whether the heating load adjustment power is less than or equal to the preset heating load power; if yes, proceed to step S710; if no, proceed to step S707.

[0175] S710, stops the active power output of the wind turbine, adjusts the active power output of the diesel generator, and adjusts the active power output of the grid-type energy storage unit.

[0176] S711, obtains the unbalanced power of the isolated grid heating system of the wind farm.

[0177] S712, obtains the total inertia of the wind farm's isolated grid heating system based on unbalanced power.

[0178] S713, based on the unbalanced power, obtains the first moment corresponding to when the unbalanced power is zero during the frequency change process.

[0179] S714 obtains the inertia of the grid-type energy storage based on the unbalanced power, total inertia, and the first moment.

[0180] S715 adjusts the active power output state of the grid-type energy storage unit according to the inertia of the grid-type energy storage.

[0181] S716, sequentially adjusts the active power output of the diesel generator and the active power output of the grid-type energy storage unit.

[0182] S717, based on the reactive power stability of the wind farm's isolated grid heating system, obtains the response speed information of the diesel generator, wind turbine, and grid-type energy storage unit. Among them, the response speed of the grid-type energy storage unit is greater than that of the diesel generator, and the response speed of the diesel generator is greater than that of the wind turbine.

[0183] To ensure the stable reactive power operation of the isolated wind farm heating system, diesel generators, wind turbines, and grid-type energy storage units are used to provide reactive power. Therefore, it is necessary to obtain the response speed information of these components. Grid-type energy storage units are characterized by fast response speed and limited overload capacity. They can promptly boost system voltage after a voltage fault, but their ability to provide excessive reactive power support is limited when a large amount is required. Diesel generators are a second type of power source, a traditional reactive power source characterized by slow reactive power response speeds on the order of hundreds of milliseconds, but possessing strong overload capacity and providing support in the later stages of a fault. Wind turbines are a third type of reactive power source. Wind turbines are characterized by slow response, and their reactive power output capacity is closely related to their active power output, meaning it is related to wind speed. This indicates that the reactive power output capacity of wind turbines is unstable and can only serve as a supplement to the system's reactive power supply. Therefore, the response speed of a grid-type energy storage unit is greater than that of a diesel generator, which in turn is greater than that of a wind turbine. By utilizing the fastest reactive power source, reactive power support can be provided, thereby ensuring the reactive power stability of the system.

[0184] S718: Obtain the start-up sequence information of diesel generators, wind turbines, and grid-type energy storage units based on response speed information. The start-up sequence of grid-type energy storage units is higher than that of diesel generators, and the start-up sequence of diesel generators is higher than that of wind turbines.

[0185] The startup sequence information of diesel generators, wind turbines, and grid-type energy storage units is obtained based on the response speed information. The startup sequence of grid-type energy storage units is higher than that of diesel generators, and the startup sequence of diesel generators is higher than that of wind turbines. Therefore, grid-type energy storage units need to be started first to provide reactive power and ensure the reactive power stability of the system.

[0186] S719 determines the reactive power output status of the diesel generator, wind turbine, and grid-type energy storage unit based on the startup sequence information.

[0187] Specifically, the reactive power output state of the diesel generator, wind turbine, and grid-type energy storage unit is adjusted according to the starting sequence information of the diesel generator, wind turbine, and grid-type energy storage unit. The grid-type energy storage unit is started first, and then when the reactive power provided by the grid-type energy storage unit is insufficient, the diesel generator or wind turbine is started in turn to be in a reactive power output state.

[0188] S720 determines the voltage output status of diesel generators, wind turbines, grid-type energy storage units, and static var compensators based on the stable voltage operation status of the wind farm's isolated grid heating system.

[0189] S721 is used to control the operation of the isolated grid heating system of the wind farm based on the active power output status, reactive power output status, and voltage output status.

[0190] This invention, through its embodiment, obtains the response speed information of diesel generators, wind turbines, and grid-type energy storage units based on the reactive power stability operation status of an isolated wind farm heating system. The response speed of the grid-type energy storage unit is greater than that of the diesel generator, which in turn is greater than that of the wind turbine. Based on the response speed information, the invention also obtains the startup sequence information of the diesel generator, wind turbine, and grid-type energy storage unit, with the startup sequence of the grid-type energy storage unit preceding that of the diesel generator, which in turn precedes that of the wind turbine. Based on the startup sequence information, the reactive power output status of the diesel generator, wind turbine, and grid-type energy storage unit is determined. By rationally starting the reactive power output status of these components, the system's reactive power stability is ensured.

[0191] Figure 9 A flowchart of another operation control method for an isolated wind farm heating system provided in an embodiment of the present invention is shown below. Figure 9 As shown, the operation and control methods for isolated grid heating systems in wind farms include:

[0192] S801, obtain the system active power of the isolated grid heating system of the wind farm.

[0193] S802, obtain the preset system active power.

[0194] S803, based on the active power stability of the wind farm isolated grid heating system, determine whether the system active power is less than or equal to the preset system active power; if yes, proceed to step S804, otherwise proceed to step S816.

[0195] S804 controls the diesel generator, wind turbine, and grid-type energy storage unit to be in an active output state.

[0196] S805, obtain the heating load power.

[0197] S806, determine whether the heating load power is greater than the system active power; if yes, proceed to step S807; if no, proceed to step S804.

[0198] S807 reduces heating load power.

[0199] S808, obtains the heating load adjustment power and the preset heating load power.

[0200] S809, determine whether the heating load adjustment power is less than or equal to the preset heating load power; if yes, proceed to step S810; if no, proceed to step S807.

[0201] S810, stops the active power output of the wind turbine, adjusts the active power output of the diesel generator, and adjusts the active power output of the grid-type energy storage unit.

[0202] S811, obtains the unbalanced power of the isolated grid heating system of the wind farm.

[0203] S812, obtains the total inertia of the wind farm's isolated grid heating system based on unbalanced power.

[0204] S813, based on the unbalanced power, obtains the first moment corresponding to when the unbalanced power is zero during the frequency change process.

[0205] S814 obtains the inertia of the grid-type energy storage based on the unbalanced power, total inertia, and the first moment.

[0206] S815 adjusts the active power output state of the grid-type energy storage unit according to the inertia of the grid-type energy storage.

[0207] S816, sequentially adjusts the active power output of the diesel generator and the active power output of the grid-type energy storage unit.

[0208] S817, based on the reactive power stable operation state of the wind farm isolated grid heating system, obtains the response speed information of diesel generators, wind turbines and grid-type energy storage units. Among them, the response speed of grid-type energy storage units is greater than that of diesel generators, and the response speed of diesel generators is greater than that of wind turbines.

[0209] S818 obtains the start-up sequence information of diesel generators, wind turbines and grid-type energy storage units based on response speed information. The start-up sequence of grid-type energy storage units is higher than that of diesel generators, and the start-up sequence of diesel generators is higher than that of wind turbines.

[0210] S819 determines the reactive power output status of the diesel generator, wind turbine, and grid-type energy storage unit based on the startup sequence information.

[0211] S820, based on the voltage stability operation status of the wind farm's isolated grid heating system, obtains the rated capacity of the grid-type energy storage unit, the rated transformer capacity of the wind turbine, the rated capacity of the wind turbine, and the rated static var compensation capacity of the static var compensation unit.

[0212] The system's voltage stability is closely related to its short-circuit capacity. The power sources providing short-circuit current in the same city are diesel generators, wind turbines, and grid-connected energy storage units. Typically, the rated capacity of a diesel generator is S. c The short-circuit capacity exhibited during a short circuit is approximately 6.5 seconds. c The rated capacity of grid-type energy storage is S. e The short-circuit capacity exhibited during a short circuit is approximately 3 seconds. e The rated capacity of the fan is S. w The short-circuit impedance of the wind turbine transformer box is U. kw The rated capacity of the fan transformer is S. T During a short circuit, the short-circuit capacity provided by the heating load on the low-voltage busbar side is .

[0213] S821, obtain the capacity correspondence based on the rated capacity of grid-type energy storage, the rated capacity of wind turbine transformer, the rated capacity of wind turbine, and the rated capacity of static var compensation.

[0214] Among them, the short-circuit capacity S on the low-voltage side 400 Satisfying the formula The inrush current is a very large inrush current generated on the primary side of the wind turbine transformer when it is closed under no-load conditions or restored after an external fault is cleared. Its value can reach 6 to 8 times the rated current of the transformer. Voltage protection settings are generally set to activate after 0.5 seconds. After 0.5 seconds, the inrush current multiple needs to be checked to ensure that the inrush current does not cause excessive voltage fluctuations on the 400V low-voltage side, leading to overvoltage or undervoltage protection activation. Therefore, it is necessary to ensure... ; Rated capacity of the fan box variable transformer S T Generally, it refers to the rated capacity (S) of the fan. w 1.1 times that, U kw The initial capacity is typically 7%, thus yielding the following correspondence: Among them, S e For grid-type energy storage rated capacity, S T Rated transformer capacity of the wind turbine, S W This refers to the rated capacity of the wind turbine. If the number of diesel generators and grid-type energy storage units in the system meets the usage requirements, then there is no need to introduce the rated capacity of static var compensation; however, if the number of diesel generators and grid-type energy storage units in the system does not meet the usage requirements, the capacity correspondence satisfies the formula: Among them, S e For grid-type energy storage rated capacity, ST Rated transformer capacity of the wind turbine, S W Rated capacity of the fan, S SVG This is the rated capacity for static var compensation. Meeting the above capacity correspondence ensures the voltage stability of the system.

[0215] S822 obtains the short-circuit current of the diesel generator, wind turbine, grid-type energy storage unit and static var compensator unit according to the capacity correspondence.

[0216] The short-circuit currents of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator are obtained by combining the capacity corresponding formula, thereby ensuring the system voltage stability.

[0217] S823 determines the voltage output status of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensator based on the short-circuit current.

[0218] S824, based on the active power output status, reactive power output status, and voltage output status, completes the operation control of the isolated grid heating system of the wind farm.

[0219] This invention, through its embodiment, obtains the rated capacity of the grid-type energy storage unit, the rated transformer capacity of the wind turbine, the rated capacity of the wind turbine, and the rated static var compensation capacity of the static var compensation unit based on the voltage stability operation status of the isolated wind farm heating system. It then establishes a capacity correspondence based on these values. Next, it obtains the short-circuit currents of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensation unit based on this correspondence. Finally, it determines the voltage output status of the diesel generator, wind turbine, grid-type energy storage unit, and static var compensation unit based on the short-circuit currents, thereby achieving voltage stability during the operation of the isolated wind farm heating system.

[0220] Figure 10 A schematic diagram of the operation control device for an isolated wind farm heating system is provided for an embodiment of the present invention, as shown below. Figure 10 As shown, the operation control device of the wind farm isolated grid heating system executes the operation control method of the wind farm isolated grid heating system, which includes any one of the above aspects. The operation control device of the wind farm isolated grid heating system includes:

[0221] The active power output status determination module 201 is used to determine the active power output status of the diesel generator, wind turbine and grid-type energy storage unit based on the active power stable operation status of the wind farm isolated grid heating system.

[0222] The reactive power output status determination module 202 is used to determine the reactive power output status of diesel generators, wind turbines and grid-type energy storage units based on the reactive power stable operation status of the wind farm isolated grid heating system.

[0223] The voltage output status determination module 203 is used to determine the voltage output status of the diesel generator, wind turbine, grid-type energy storage unit and static var compensator based on the voltage stability operation status of the wind farm isolated grid heating system.

[0224] The operation control completion module 204 is used to complete the operation control of the wind farm isolated grid heating system based on the active power output status, reactive power output status and the voltage output status.

[0225] It should be noted that since the operation control device of the wind farm isolated grid heating system provided in this embodiment includes any of the operation control methods of the wind farm isolated grid heating system provided in the embodiments of the present invention, it has the same or corresponding beneficial effects as the operation control method of the wind farm isolated grid heating system, and will not be elaborated here.

[0226] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for operating and controlling an isolated grid heating system in a wind farm, applied to such a system, wherein the isolated grid heating system comprises at least a grid-type energy storage unit, a wind turbine, a diesel generator, a static var compensator (SVC), a high-voltage bus, a low-voltage bus, a first transformer unit, a second transformer unit, a third transformer unit, and a heating load; the grid-type energy storage unit, the heating load, and the diesel generator are respectively connected to the low-voltage bus; the wind turbine is connected to the high-voltage bus via the first transformer unit; the SVC is connected to the high-voltage bus via the second transformer unit; and the high-voltage bus and the low-voltage bus are connected via the third transformer unit. The operation and control methods for isolated grid heating systems in wind farms include: Based on the active stable operation status of the isolated grid heating system of the wind farm, the active output status of the diesel generator, the wind turbine and the grid-type energy storage unit is determined. Based on the reactive power stable operation state of the isolated grid heating system of the wind farm, the reactive power output state of the diesel generator, the wind turbine and the grid-type energy storage unit is determined; Based on the stable voltage operation of the wind farm isolated grid heating system, the voltage output status of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator unit is determined. Based on the active power output state, the reactive power output state, and the voltage output state, the operation control of the wind farm isolated grid heating system is completed. Adjusting the grid-type energy storage unit to an active power output state includes: Obtain the unbalanced power of the isolated grid heating system of the wind farm; The total inertia of the isolated grid heating system of the wind farm is obtained based on the unbalanced power. The inertia of the grid-type energy storage is obtained based on the unbalanced power and the total inertia. The active power output state of the grid-type energy storage unit is adjusted according to the grid-type energy storage inertia.

2. The operation control method for an isolated grid heating system in a wind farm according to claim 1, characterized in that, Before determining the active power output status of the diesel generator, the wind turbine, and the grid-type energy storage unit based on the active power stable operation status of the isolated wind farm heating system, the process further includes: Obtain the system active power of the isolated grid heating system of the wind farm; Obtain the preset system active power; Based on the active power stable operation state of the isolated grid heating system of the wind farm, the active power output state of the diesel generator, the wind turbine, and the grid-type energy storage unit is determined, including: Based on the active power stable operation status of the wind farm isolated grid heating system, determine whether the active power of the system is less than or equal to the preset active power of the system; If so, then the diesel generator, the wind turbine, and the grid-type energy storage unit are all controlled to be in an active power output state; If not, then adjust the active power output of the diesel generator and the active power output of the grid-type energy storage unit in sequence.

3. The operation control method for a wind farm isolated grid heating system according to claim 2, characterized in that, After controlling the diesel generator, the wind turbine, and the grid-type energy storage unit to be in an active power output state, the method further includes: Obtain the heating load power; Determine whether the heating load power is greater than the system active power; If so, then reduce the heating load power; If not, continue with the step of controlling the diesel generator, the wind turbine, and the grid-type energy storage unit to be in an active power output state.

4. The operation control method for an isolated grid heating system in a wind farm according to claim 3, characterized in that, After reducing the heating load power, the method further includes: Obtain the heating load adjustment power and the preset heating load power; Determine whether the adjusted heating load power is less than or equal to the preset heating load power; If so, then stop the active power output state of the wind turbine, adjust the active power output state of the diesel generator, and adjust the active power output state of the grid-type energy storage unit. If not, continue with the step of reducing the heating load power.

5. The operation control method for a wind farm isolated grid heating system according to claim 4, characterized in that, Obtaining the grid-type energy storage inertia based on the unbalanced power and the total inertia includes: Based on the unbalanced power, obtain the first moment corresponding to when the unbalanced power is zero during the frequency change process; The inertia of the grid-type energy storage is obtained based on the unbalanced power, the total inertia, and the first moment.

6. The operation control method for an isolated grid heating system in a wind farm according to claim 1, characterized in that, Based on the reactive power stable operation state of the isolated grid heating system of the wind farm, the reactive power output state of the diesel generator, the wind turbine, and the grid-type energy storage unit is determined, including: Based on the reactive power stability of the wind farm's isolated grid heating system, the response speed information of the diesel generator, the wind turbine, and the grid-type energy storage unit is obtained, wherein the response speed of the grid-type energy storage unit is greater than the response speed of the diesel generator, and the response speed of the diesel generator is greater than the response speed of the wind turbine. The startup sequence information of the diesel generator, the wind turbine, and the grid-type energy storage unit is obtained based on the response speed information, wherein the startup sequence of the grid-type energy storage unit is higher than the startup sequence of the diesel generator, and the startup sequence of the diesel generator is higher than the startup sequence of the wind turbine. The reactive power output status of the diesel generator, the wind turbine, and the grid-type energy storage unit is determined based on the startup sequence information.

7. The operation control method for an isolated grid heating system in a wind farm according to claim 1, characterized in that, Based on the stable voltage operation of the wind farm's isolated grid heating system, the voltage output states of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator are determined, including: Based on the voltage stability of the wind farm's isolated grid heating system, the rated capacity of the grid-type energy storage unit, the rated transformer capacity of the wind turbine, the rated capacity of the wind turbine, and the rated capacity of the static var compensator unit are obtained. The capacity correspondence is obtained based on the rated capacity of the grid-type energy storage, the rated capacity of the wind turbine transformer, the rated capacity of the wind turbine, and the rated capacity of the static var compensator. The short-circuit currents of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator are obtained according to the capacity correspondence. The voltage output states of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator are determined based on the short-circuit current.

8. The operation control method for an isolated grid heating system in a wind farm according to claim 7, characterized in that, The capacity correspondence satisfies the formula: ； Among them, S e For grid-type energy storage rated capacity, S T Rated transformer capacity of the wind turbine, S W Rated capacity of the fan, S SVG This refers to the rated capacity for static var compensation.

9. An operation control device for an isolated grid heating system in a wind farm, characterized in that, The operation control device of the wind farm isolated grid heating system executes the operation control method of the wind farm isolated grid heating system according to any one of claims 1-8, wherein the operation control device of the wind farm isolated grid heating system comprises: The active power output status determination module is used to determine the active power output status of diesel generators, wind turbines and grid-type energy storage units based on the active power stable operation status of the wind farm isolated grid heating system. The reactive power output status determination module is used to determine the reactive power output status of the diesel generator, the wind turbine, and the grid-type energy storage unit based on the reactive power stable operation status of the wind farm isolated grid heating system. The voltage output status determination module is used to determine the voltage output status of the diesel generator, the wind turbine, the grid-type energy storage unit, and the static var compensator unit based on the voltage stability operation status of the wind farm's isolated grid heating system. The operation control completion module is used to complete the operation control of the wind farm isolated grid heating system based on the active power output status, the reactive power output status and the voltage output status.

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