Offshore wind power plant active time sequence optimization control method and device

Abstract

The invention provides an active time sequence optimization control method and device for an offshore wind plant, and relates to the technical field of offshore power generation, and the method comprises the steps: controlling each critical output type unit in the offshore wind plant to stop, and obtaining a first active output total decrement of the offshore wind plant after all critical output type units stop; judging whether the total power output of the offshore wind plant is balanced with the power grid load demand after all the critical output type units are shut down, and if the total power output is not balanced with the power grid load demand, obtaining the maximum power generation power which can be provided by all the units of the offshore wind plant in a grid-connected state; if the power grid load demand is smaller than the maximum power generation power, the actual active power output of the offshore wind plant in the last control period is obtained; and obtaining a difference value between the power grid load demand and the actual active power output, taking a sum value of the difference value and the first active power output total decrement as a power regulation quantity corresponding to the offshore wind plant, and carrying out power limiting control based on the power regulation quantity in combination with a unit in a grid-connected state.

Description

Technical Field

[0001] The present application relates to the field of offshore power generation technology, and in particular to an offshore wind farm active power sequence optimization control method and device. Background Art

[0002] Offshore wind power generation refers to the construction of wind turbines on water bodies such as oceans or large lakes, using strong wind resources at sea to generate electricity. Compared with land-based wind power generation, offshore wind power generation has more stable and stronger wind energy resources, and the wind speed at sea is higher and more continuous, which enables offshore wind power generation to achieve higher wind energy capture efficiency and more stable power generation. In any regulation cycle, the auxiliary frequency control center needs to coordinate and distribute the active output of the units in the wind farm through a series of control processes according to the changing load demand. Summary of the invention

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] The first embodiment of the present application proposes an offshore wind farm active power sequence optimization control method, including: judging whether there is a critical output type unit in the offshore wind farm according to the real-time status information of each wind turbine unit in the offshore wind farm monitored in the current control cycle; if there is a critical output type unit, controlling each critical output type unit to shut down, and obtaining the first total active power output reduction of the offshore wind farm after all critical output type units are shut down; judging whether the total power output of the offshore wind farm is balanced with the grid load demand after all critical output type units are shut down, and if the total power output is unbalanced with the grid load demand, obtaining the offshore wind farm active power sequence optimization control method, including: judging whether there is a critical output type unit in the offshore wind farm according to the real-time status information of each wind turbine unit in the offshore wind farm monitored in the current control cycle; if there is a critical output type unit, controlling each critical output type unit to shut down, and obtaining the first total active power output reduction of the offshore wind farm after all critical output type units are shut down; judging whether the total power output of the offshore wind farm is balanced with the grid load demand after all critical output type units are shut down, and obtaining the offshore wind farm active power sequence optimization control method, The maximum power generation power that can be provided by all the units in the offshore wind farm connected to the grid is obtained, and all the units in the grid-connected state include low wind speed units and high wind speed units. If the grid load demand is less than the maximum power generation power that can be provided by all the units in the current offshore wind farm connected to the grid, obtain the actual active power output of the offshore wind farm in the previous control cycle. Obtain the difference between the grid load demand and the actual active power output of the offshore wind farm in the previous control cycle, and use the sum of the difference and the first total active output reduction as the power regulation amount corresponding to the offshore wind farm, and perform power limitation control based on the power regulation amount in combination with the low wind speed units and the high wind speed units.

[0005] According to one embodiment of the present application, based on the real-time status information of each wind turbine in the offshore wind farm monitored during the current control cycle, before determining whether there is a critical output unit in the offshore wind farm, it also includes: defining the models of wind turbines in the offshore wind farm, and defining wind turbines that have potential fault hazards and need to be shut down and maintained as critical output units; defining units whose wind speed at the center of the hub is greater than the cut-in wind speed and less than the rated wind speed as low wind speed units, wherein the low wind speed units are in a grid-connected state; defining units whose wind speed at the center of the hub is greater than or equal to the rated wind speed as high wind speed units, wherein the high wind speed units are in a grid-connected state.

[0006] According to one embodiment of the present application, power limiting control is performed based on the power regulation amount in combination with the low wind speed type units and the high wind speed type units, including: if the power regulation amount is less than or equal to zero, load reduction operation control is performed based on the low wind speed type units and the high wind speed type units until the total power output of the offshore wind farm is balanced with the grid load demand; if the power regulation amount is greater than zero, power increase control is performed based on the low wind speed type units and the high wind speed type units until the total power output of the offshore wind farm is balanced with the grid load demand.

[0007] According to one embodiment of the present application, if the power regulation amount is less than or equal to zero, load reduction operation control is performed based on the low wind speed type units and the high wind speed type units until the total power output of the offshore wind farm is balanced with the grid load demand, including: taking the output power of the wind turbine unit at the cut-in wind speed as the minimum grid-connected power; obtaining the second total active output reduction of all low wind speed type units when all low wind speed type units are reduced from the current actual active power output to the minimum grid-connected power in the current control cycle; if the absolute value of the power regulation amount is less than or equal to the second total active output reduction, obtaining a first ratio of the absolute value of the power regulation amount to the second total active output reduction, and performing power reduction on each low wind speed type unit according to the first ratio by adjusting the electromagnetic torque; if the absolute value of the power regulation amount is greater than the second total active output reduction, controlling all low wind speed type units to increase their current actual active power output to the minimum grid-connected power in the current control cycle. The power output is reduced to the minimum grid-connected power, and it is determined whether the total power output of the offshore wind farm is balanced with the grid load demand after all low wind speed units are reduced from the current actual active power output to the minimum grid-connected power; if the total power output of the offshore wind farm is unbalanced with the grid load demand after all low wind speed units are reduced from the current actual active power output to the minimum grid-connected power, the difference between the absolute value of the power regulation amount and the second total active output reduction amount is obtained as the high wind speed active output regulation amount corresponding to the high wind speed unit; the third total active output reduction amount of all high wind speed units is obtained if all high wind speed units are reduced from the current actual active power output to the minimum grid-connected power in the current control period; the second ratio of the high wind speed active output regulation amount to the third total active output reduction amount is obtained, and the power load is reduced for each high wind speed unit according to the second ratio by adjusting the wind rotor pitch angle.

[0008] According to one embodiment of the present application, if the power adjustment amount is greater than zero, power increase control is performed based on the low wind speed type unit and the high wind speed type unit until the total power output of the offshore wind farm is balanced with the grid load demand, including: obtaining the total increase in low wind speed type active power output of all the low wind speed type units when all the low wind speed type units are increased from the current actual active power output to the maximum active power output in the current control cycle; if the power adjustment amount is less than or equal to the total increase in low wind speed type active power output, obtaining a third ratio of the power adjustment amount to the total increase in low wind speed type active power output, and increasing the power of each low wind speed type unit according to the third ratio by adjusting the electromagnetic torque; if the power adjustment amount is greater than the total increase in low wind speed type active power output, controlling all the low wind speed type units to increase from the current actual active power output to the maximum in the current control cycle. The method comprises the following steps: determining a high wind speed type wind farm and determining whether the total power output of the offshore wind farm is balanced with the grid load demand after all low wind speed type wind farm units increase from the current actual active power output to the maximum active power output; determining whether the total power output of the offshore wind farm is balanced with the grid load demand after all low wind speed type wind farm units increase from the current actual active power output to the maximum active power output; if the total power output of the offshore wind farm is unbalanced with the grid load demand after all low wind speed type wind farm units increase from the current actual active power output to the maximum active power output, obtaining the difference between the power adjustment amount and the total increase in the low wind speed type active output as the high wind speed active output adjustment amount corresponding to the high wind speed type wind farm unit; obtaining the total increase in the high wind speed type active output of all high wind speed type wind farm units when all high wind speed type wind farm units increase from the current actual active power output to the maximum active output within the current control period; obtaining a fourth ratio of the high wind speed active output adjustment amount to the total increase in the high wind speed type active output, and increasing the power of each high wind speed type wind farm unit according to the fourth ratio by adjusting the wind rotor pitch angle.

[0009] According to one embodiment of the present application, after obtaining the maximum power generation power that can be provided by all the units in the offshore wind farm that are connected to the grid, it also includes: if the grid load demand is equal to the maximum power generation power that can be provided by all the units in the offshore wind farm that are connected to the grid, then all the units in the offshore wind farm that are connected to the grid are controlled to maintain maximum power tracking or rated power output state operation.

[0010] According to one embodiment of the present application, after obtaining the maximum power generation power that can be provided by all the units in the offshore wind farm that are connected to the grid, it also includes: if the grid load demand is greater than the maximum power generation power that can be provided by all the units in the offshore wind farm that are connected to the grid, then controlling all the units in the offshore wind farm that are connected to the grid to maintain maximum power tracking or rated power output state operation; obtaining the difference between the grid load demand and the maximum power generation power; and compensating for the difference based on other generator sets or energy storage devices other than the offshore wind farm.

[0011] According to one embodiment of the present application, the offshore wind farm active power timing optimization control method also includes: if it is determined that the total power output of the offshore wind farm is balanced with the grid load demand, then the frequency of each wind turbine is not adjusted during the current control cycle, and the power generation status of the wind turbine in the current control cycle is maintained.

[0012] The second embodiment of the present application proposes an offshore wind farm active power sequence optimization control device, including: a monitoring module, which is used to determine whether there is a critical output type unit in the offshore wind farm based on the real-time status information of each wind turbine unit in the offshore wind farm monitored during the current control cycle; a control module, which is used to control each critical output type unit to shut down if there is a critical output type unit, and obtain the first total active power output reduction of the offshore wind farm after all critical output type units are shut down; a judgment module is used to determine whether the total power output of the offshore wind farm is balanced with the grid load demand after all critical output type units are shut down, and if the total power output is unbalanced with the grid load demand, obtain The maximum power generation power that can be provided by all the units in the offshore wind farm connected to the grid, and all the units in the grid-connected state include low wind speed units and high wind speed units; an acquisition module, used to obtain the actual active power output of the offshore wind farm in the previous control cycle if the grid load demand is less than the maximum power generation power that can be provided by all the units in the current offshore wind farm connected to the grid; a power limiting module, used to obtain the difference between the grid load demand and the actual active power output of the offshore wind farm in the previous control cycle, and use the sum of the difference and the first total active output reduction as the power adjustment amount corresponding to the offshore wind farm, and perform power limiting control based on the power adjustment amount in combination with the low wind speed units and the high wind speed units.

[0013] According to one embodiment of the present application, the active timing optimization control device for an offshore wind farm also includes: a setting module, which is used to define the types of wind turbines in the offshore wind farm, and to define wind turbines that have potential fault hazards and need to be shut down and maintained as critical output units; to define units whose wind speed at the center of the hub is greater than the cut-in wind speed and less than the rated wind speed as low wind speed units, wherein the low wind speed units are in a grid-connected state; to define units whose wind speed at the center of the hub is greater than or equal to the rated wind speed as high wind speed units, wherein the high wind speed units are in a grid-connected state.

[0014] According to one embodiment of the present application, the power limiting module is also used to: if the power regulation amount is less than or equal to zero, perform load reduction operation control based on the low wind speed type units and the high wind speed type units until the total power output of the offshore wind farm is balanced with the grid load demand; if the power regulation amount is greater than zero, perform power increase control based on the low wind speed type units and the high wind speed type units until the total power output of the offshore wind farm is balanced with the grid load demand.

[0015] According to one embodiment of the present application, the power limiting module is also used to: use the output power of the wind turbine set at the cut-in wind speed as the minimum grid-connected power; obtain the total reduction in the second active power output of all low wind speed units when all low wind speed units are reduced from the current actual active power output to the minimum grid-connected power in the current control cycle; if the absolute value of the power regulation amount is less than or equal to the second total active output reduction, obtain a first ratio of the absolute value of the power regulation amount to the second total active output reduction, and reduce the power load of each low wind speed unit according to the first ratio by adjusting the electromagnetic torque; if the absolute value of the power regulation amount is greater than the second total active output reduction, control all low wind speed units to reduce their current actual active power output to the minimum grid-connected power in the current control cycle, and judge among all low wind speed units Whether the total power output of the offshore wind farm is balanced with the grid load demand after the current actual active power output is reduced to the minimum grid-connected power; if the total power output of the offshore wind farm is unbalanced with the grid load demand after all low wind speed units are reduced from the current actual active power output to the minimum grid-connected power, obtain the difference between the absolute value of the power regulation amount and the second total active output reduction amount as the high wind speed active output regulation amount corresponding to the high wind speed unit; obtain the third total active output reduction amount of all high wind speed units reduced in total when all high wind speed units are reduced from the current actual active power output to the minimum grid-connected power in the current control period; obtain the second ratio of the high wind speed active output regulation amount to the third total active output reduction amount, and reduce the power load of each high wind speed unit according to the second ratio by adjusting the wind rotor pitch angle.

[0016] According to one embodiment of the present application, the power limiting module is also used to: obtain the total increase in the low wind speed type active power output of all the low wind speed type units when all the low wind speed type units increase from the current actual active power output to the maximum active power output in the current control cycle; if the power adjustment amount is less than or equal to the total increase in the low wind speed type active power output, obtain a third ratio of the power adjustment amount to the total increase in the low wind speed type active power output, and increase the power of each low wind speed type unit according to the third ratio by adjusting the electromagnetic torque; if the power adjustment amount is greater than the total increase in the low wind speed type active power output, control all the low wind speed type units to increase from the current actual active power output to the maximum active power output in the current control cycle, and judge whether the total increase in the low wind speed type active power output is greater than the current actual active power output. to whether the total power output of the offshore wind farm is balanced with the grid load demand after reaching the maximum active output; if the total power output of the offshore wind farm is unbalanced with the grid load demand after all low wind speed units are increased from the current actual active power output to the maximum active output, obtain the difference between the power adjustment amount and the total increase in the low wind speed type active output as the high wind speed active output adjustment amount corresponding to the high wind speed unit; obtain the total increase in the high wind speed type active output of all high wind speed units when all high wind speed units are increased from the current actual active power output to the maximum active output in the current control cycle; obtain a fourth ratio of the high wind speed active output adjustment amount to the total increase in the high wind speed type active output, and increase the power of each high wind speed unit according to the fourth ratio by adjusting the wind rotor pitch angle.

[0017] According to one embodiment of the present application, the acquisition module is also used to: if the grid load demand is equal to the maximum power generation power that can be provided by all the units in the offshore wind farm that are connected to the grid, then control all the units in the offshore wind farm that are connected to the grid to maintain maximum power tracking or rated power output state operation.

[0018] According to one embodiment of the present application, the acquisition module is also used for: if the grid load demand is greater than the maximum power generation power that can be provided by all the units in the offshore wind farm and connected to the grid, then controlling all the units in the offshore wind farm and connected to the grid to maintain maximum power tracking or rated power output operation; obtaining the difference between the grid load demand and the maximum power generation power; and compensating for the difference based on other generator sets or energy storage devices other than the offshore wind farm.

[0019] According to one embodiment of the present application, the judgment module is also used for: if it is judged that the total power output of the offshore wind farm is balanced with the grid load demand, then the frequency of each wind turbine is not adjusted during the current control cycle, and the power generation status of the wind turbine in the current control cycle is maintained.

[0020] The third aspect embodiment of the present application proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the active timing optimization control method for an offshore wind farm as described in the first aspect embodiment of the present application.

[0021] The fourth aspect embodiment of the present application proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to implement the active power timing optimization control method of an offshore wind farm as described in the first aspect embodiment of the present application.

[0022] The fifth aspect of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the offshore wind farm active power timing optimization control method as described in the first aspect of the present application.

[0023] The present application achieves at least the following beneficial effects: by monitoring the real-time status information of each wind turbine in the offshore wind farm, the present application can determine whether there are critical output units. In the case of critical output units, these units are controlled to be shut down, thereby avoiding their unstable impact on the power grid, which helps to improve the stability and reliability of the power grid; after all critical output units are shut down, the balance between the total power output of the offshore wind farm and the load demand of the power grid is determined. If the total power output is unbalanced with the load demand of the power grid, the power adjustment amount is calculated according to the gap between the load demand of the power grid and the actual active output of the offshore wind farm, and power-limiting control is performed in combination with low wind speed units and high wind speed units, which enables the offshore wind farm to accurately and flexibly adjust power generation according to actual needs, thereby improving power supply reliability and economic benefits. When combining low wind speed units and high wind speed units for power limiting control, since low wind speed units can adjust and recover power faster than high wind speed units, and electromagnetic torque is easier to control than mechanical torque, low wind speed units are given priority for power balance adjustment. If the adjustment of low wind speed units alone cannot meet the balance between total power output and grid load demand, high wind speed units are then used for power balance adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0025] Figure 1 It is a schematic diagram of an exemplary implementation of an offshore wind farm active power sequence optimization control method shown in the present application.

[0026] Figure 2It is a schematic diagram of an exemplary implementation of an offshore wind farm active power sequence optimization control method shown in the present application.

[0027] Figure 3 It is a schematic diagram of an offshore wind farm active power timing optimization control device shown in the present application.

[0028] Figure 4 It is a schematic diagram of an electronic device shown in one embodiment of the present application. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0030] Figure 1 is a schematic diagram of an exemplary implementation of an offshore wind farm active power sequence optimization control method shown in the present application, such as Figure 1 As shown, the offshore wind farm active power sequence optimization control method comprises the following steps:

[0031] S101, judging whether there is a critical output type unit in the offshore wind farm according to the real-time status information of each wind turbine unit in the offshore wind farm monitored in the current control cycle.

[0032] S102: If there are critical output type units, each critical output type unit is controlled to be shut down, and a first total reduction in active power output of the offshore wind farm after all critical output type units are shut down is obtained.

[0033] S103, determining whether the total power output of the offshore wind farm is balanced with the grid load demand after all critical output units are shut down; if the total power output is not balanced with the grid load demand, obtaining the maximum power generation capacity that can be provided by all grid-connected units of the offshore wind farm, wherein all grid-connected units include low wind speed units and high wind speed units.

[0034] S104: If the grid load demand is less than the maximum power generation power that can be provided by all the units in the current offshore wind farm connected to the grid, the actual active power output of the offshore wind farm in the last control cycle is obtained.

[0035] S105, obtaining the difference between the grid load demand and the actual active output of the offshore wind farm in the previous control cycle, and taking the sum of the difference and the first total active output reduction as the power regulation amount corresponding to the offshore wind farm, and performing power limitation control based on the power regulation amount in combination with the low wind speed type units and the high wind speed type units.

[0036] This application can determine whether there are critical output units by monitoring the real-time status information of each wind turbine in the offshore wind farm. In the case of critical output units, these units are controlled to be shut down to avoid their unstable impact on the power grid, which helps to improve the stability and reliability of the power grid; after all critical output units are shut down, the balance between the total power output of the offshore wind farm and the load demand of the power grid is determined. If the total power output is unbalanced with the load demand of the power grid, the power adjustment amount is calculated based on the gap between the load demand of the power grid and the actual active output of the offshore wind farm, and power-limiting control is performed in combination with low wind speed units and high wind speed units. This enables the offshore wind farm to accurately and flexibly adjust power generation according to actual needs, thereby improving power supply reliability and economic benefits. When combining low wind speed units and high wind speed units for power limiting control, since low wind speed units can adjust and recover power faster than high wind speed units, and electromagnetic torque is easier to control than mechanical torque, low wind speed units are given priority for power balance adjustment. If the adjustment of low wind speed units alone cannot meet the balance between total power output and grid load demand, high wind speed units are then used for power balance adjustment.

[0037] Figure 2 is a schematic diagram of an exemplary implementation of an offshore wind farm active power sequence optimization control method shown in the present application, such as Figure 2 As shown, the offshore wind farm active power sequence optimization control method comprises the following steps:

[0038] S201, define the types of wind turbines in the offshore wind farm.

[0039] In order to better distribute the active power output of each unit when the grid load demand changes, and effectively improve the calculation efficiency and reduce the solution scale in the process of wind farm optimization control, it is necessary to reasonably classify the units in the field in this application. The specific classification method is as follows:

[0040] The first type: critical output type units. During the power generation process, there may be a few wind turbines in the wind farm that are in a critical safety operation state due to reasons such as excessively high generator temperature or severe vibration, that is, there are hidden dangers of failure, and they need to be shut down and maintained. In this application, wind turbines with hidden dangers of failure that need to be shut down and maintained are regarded as critical output type units. Such units need to be shut down and maintained to ensure the safety and stability of the equipment and system.

[0041] The second type: low wind speed type unit. Based on the power characteristics of the doubly fed asynchronous generator unit, it can be known that under normal conditions, when the wind speed at the center of the hub is lower than the cut-in wind speed, the wind turbine unit generates electricity but is not connected to the grid; when the wind speed is between the cut-in wind speed and the rated wind speed, the wind power is connected to the large power grid, and at the same time, the doubly fed asynchronous generator operates in accordance with the maximum power point tracking (MPPT) mode to generate electricity at its maximum capacity. In this application, the unit whose wind speed at the center of the hub is greater than the cut-in wind speed and less than the rated wind speed is regarded as a low wind speed type unit, wherein the low wind speed type unit is in a grid-connected state and operates in accordance with the maximum power point tracking mode to generate electricity at its maximum capacity. This type of unit adjusts the active output by controlling the electromagnetic torque. Compared with mechanical control, it has the advantages of fast action and small inertia time constant, and can therefore respond to the system's dispatch instructions more quickly.

[0042] The third type: high wind speed type unit. When the wind speed at the center of the hub is greater than or equal to the rated wind speed, the active output of the wind turbine needs to maintain a constant rated value. In this application, the unit whose wind speed at the center of the hub is greater than or equal to the rated wind speed is regarded as a high wind speed type unit, wherein the high wind speed type unit is in a grid-connected state. As the wind speed continues to increase, the active output of this type of unit will also change. If it is not reasonably controlled, it will directly affect the safety of the wind turbine and related equipment. The commonly used control method is to keep the electromagnetic torque unchanged, adjust the active output by changing the size of the pitch angle, and control the wind turbine to maintain the rated power output. Considering that the pitch angle adjustment is achieved through mechanical control, the inertia time constant is relatively large, generally 0.1s. In order to restore the grid frequency to stability as soon as possible, it is not suitable for frequent actions.

[0043] Assume that there are n×m units in an offshore wind farm, and a matrix V is constructed according to their locations. Ideally, V is a matrix with all 1s, and all units maintain normal operation. When the wind turbine in the i-th row and j-th column (i≤n, j≤m) in the wind farm is not put into operation or does not belong to this category, it is represented as v ij =0, otherwise v ij =1; at the same time, according to the ultra-short-term power forecast of the unit and the wind speed power curve, p ij For unit v ij The current actual active power output value, p ij，min is the output power of the unit at the cut-in wind speed, p m，ij It is the maximum active output on the MPPT curve under the wind speed condition.

[0044] In the present application, matrices V1, V2 and V3 are respectively constructed according to the corresponding positions of critical output type units, low wind speed type units and high wind speed type units in the wind farm, and V=V1+V2+V3.

[0045] S202, after defining critical output type units, low wind speed type units and high wind speed type units, determine whether there are critical output type units in the offshore wind farm based on the real-time status information of each wind turbine unit in the offshore wind farm monitored in the current control cycle.

[0046] S203: If there are critical output units, each critical output unit is controlled to be shut down for maintenance to ensure system safety and reduce the maintenance cost of the wind farm as much as possible, and the total power reduction output of the offshore wind farm after all critical output units are shut down is obtained as the first total active output reduction.

[0047] If it is determined that there are critical output units in the offshore wind farm, each critical output unit will be shut down for maintenance. This not only maintains the safety of the entire system and avoids causing greater economic losses, but also reduces power generation costs such as depreciation and operation and maintenance costs in the long run.

[0048] Among them, the total power reduction output of the offshore wind farm after all critical output units are shut down, that is, the total reduction in the first active output The calculation formula is:

[0049]

[0050] in, It represents the sum of the single power reduction output corresponding to all the critical output units that are shut down, that is, the total reduction in the first active power output.

[0051] S204, determining whether the total power output of the offshore wind farm is balanced with the load demand of the power grid after all critical output units are shut down.

[0052] S205: If the judgment result is that the total power output of the offshore wind farm is balanced with the load demand of the power grid, the frequency of each wind turbine is not adjusted in the current control cycle, and the power generation status of the wind turbine in the current control cycle is maintained.

[0053] S206, if the judgment result is that the total power output is unbalanced with the grid load demand, the maximum power generation power that can be provided by all the units in the offshore wind farm connected to the grid is obtained, and all the units in the grid-connected state include low wind speed units and high wind speed units.

[0054] S207, if the grid load demand P is equal to the maximum power generation P that can be provided by all units in the current offshore wind farm that are connected to the grid, max , all the units in the offshore wind farm that are connected to the grid are controlled to maintain maximum power tracking or rated power output operation.

[0055] Among them, in the current regulation cycle, the maximum power generation capacity of the wind farm is Pmax Mainly obtained through the power ultra-short-term prediction module, the maximum power generation power P max The calculation formula is:

[0056]

[0057] S208, if the grid load demand P is greater than the maximum power generation P that can be provided by all units in the offshore wind farm that are connected to the grid, max , then control all the units in the offshore wind farm that are connected to the grid to maintain maximum power tracking or rated power output state operation; obtain the difference between the grid load demand and the maximum power generation; and compensate for the difference based on other generator sets or energy storage devices except the offshore wind farm.

[0058] S209, if the grid load demand is less than the maximum power generation power that can be provided by all the units in the offshore wind farm connected to the grid, obtain the actual active power output of the offshore wind farm in the previous control cycle; obtain the difference between the grid load demand and the actual active power output of the offshore wind farm in the previous control cycle, and use the sum of the difference and the first total reduction in active power output as the power regulation amount AP corresponding to the offshore wind farm, and perform power limitation control based on the power regulation amount in combination with the low wind speed units and the high wind speed units.

[0059] Among them, the calculation formula of the power adjustment amount ΔP is:

[0060]

[0061] In the above formula, P*(k) represents the grid load demand in the current control cycle, P(k-1) represents the actual active power output of the offshore wind farm in the previous control cycle, Indicates the total reduction in the first active output.

[0062] As a case of power limiting control, from the previous analysis, it can be seen that low wind speed units can adjust and recover power faster than high wind speed units, and electromagnetic torque is also easier to control than mechanical torque. Therefore, low wind speed units are given priority to operate at reduced load, adjust electromagnetic torque, increase rotor speed, and operate in reserve.

[0063] If the power regulation amount is less than or equal to zero, load reduction operation control is performed based on the low wind speed type units and the high wind speed type units until the total power output of the offshore wind farm is balanced with the grid load demand.

[0064] Specifically, the output power of the wind turbine set at the cut-in wind speed is taken as the minimum grid-connected power value, and the total reduction in active output of all low wind speed units when all low wind speed units are reduced from the current actual active power output to the minimum grid-connected power value in the current control cycle is obtained as the second total reduction in active output. The calculation formula is:

[0065]

[0066] If the power regulation amount is less than or equal to zero, and the absolute value of the power regulation amount is less than or equal to the second total active output reduction amount, that is, only the low wind speed type units need to be adjusted to achieve the balance between the total power output of the offshore wind farm and the grid load demand, then a first ratio of the absolute value of the power regulation amount to the second total active output reduction amount is obtained, and the power load of each low wind speed type unit is reduced according to the first ratio by adjusting the electromagnetic torque.

[0067] Exemplarily, when the power load of each low wind speed type unit is reduced according to the first ratio by adjusting the electromagnetic torque, the power adjustment amount of each low wind speed type unit is for:

[0068]

[0069] For example, if the low wind speed unit corresponding to the 1st row and the 3rd column corresponds to If the power is 50 MW, the low wind speed unit v corresponding to the first row and third column is 13 The output power is reduced by 50 MW.

[0070] The present application proposes to reduce the power load of each low wind speed unit according to a first ratio by adjusting the electromagnetic torque, so that each unit adjusts the active output according to a certain ratio based on its power generation capacity, which is more reasonable and avoids the possibility of being unable to connect to the grid or even unplanned shutdown due to excessive unit load reduction, thereby effectively saving power generation costs.

[0071] If the power adjustment amount is less than or equal to zero, and the absolute value of the power adjustment amount is greater than the second total active output reduction, then all low wind speed units are controlled to reduce the current actual active power output to the minimum grid-connected power within the current control cycle, and it is determined whether the total power output of the offshore wind farm is balanced with the grid load demand after all low wind speed units are reduced from the current actual active power output to the minimum grid-connected power.

[0072] If it is determined that the total power output of the offshore wind farm is balanced with the grid load demand, the frequency of each wind turbine will no longer be adjusted during the current control cycle, and the power generation status of the wind turbine in the current control cycle will be maintained.

[0073] If the total power output is unbalanced with the grid load demand, in order to meet the frequency regulation requirements, it is necessary to add high wind speed units for further adjustment, and obtain the difference between the absolute value of the power adjustment amount and the second total active output reduction amount as the high wind speed active output adjustment amount corresponding to the high wind speed unit.

[0074] The high wind speed active output regulation ΔP 高 The calculation formula is:

[0075]

[0076] The total reduction in active power output of all high wind speed units when all high wind speed units are reduced from the current actual active power output to the minimum grid-connected power value in the current control cycle is taken as the third total reduction in active power output. The calculation formula is:

[0077]

[0078] Obtain a second ratio of the high wind speed active output adjustment amount to the third active output total reduction amount, and perform power load shedding on each high wind speed type unit according to the second ratio by adjusting the wind rotor pitch angle. Exemplarily, for any high wind speed type unit, perform power shedding to obtain the active power output change value corresponding to the high wind speed type unit The calculation formula is:

[0079]

[0080] in, For p ij The corresponding active power output change value of the high wind speed type unit. For example, if the high wind speed type unit corresponding to the 8th row and the 9th column corresponds to If the power is 60 MW, the high wind speed unit v corresponding to the 8th row and the 9th column is 89 The output power is reduced by 60 megawatts.

[0081] As another case of power restriction control, if the power regulation amount is greater than zero, power increase control is performed based on low wind speed units and high wind speed units until the total power output of the offshore wind farm is balanced with the grid load demand.

[0082] Specifically, the total increase in active output of all low wind speed type units is obtained when the current actual active power output of all low wind speed type units increases to the maximum active output on the MPPT curve under the wind speed condition during the current control period as the total increase in low wind speed type active output. The calculation formula is:

[0083]

[0084] If the power regulation amount is greater than zero and the power regulation amount is less than or equal to the total increase in low wind speed type active output, that is, only by adjusting the low wind speed type units, the total power output of the offshore wind farm can be balanced with the grid load demand. Then, a third ratio of the power regulation amount to the total increase in low wind speed type active output is obtained, and the power of each low wind speed type unit is increased according to the third ratio by adjusting the electromagnetic torque.

[0085] For example, when the power of each low wind speed type unit is increased according to the third ratio by adjusting the electromagnetic torque, the power adjustment amount of each low wind speed type unit is for:

[0086]

[0087] For example, if the high wind speed unit corresponding to the 2nd row and 9th column corresponds to If the power is 50 MW, the high wind speed unit v corresponding to the 2nd row and 9th column is 29 The output power increased by 50 megawatts.

[0088] If the power adjustment amount is greater than zero, and the power adjustment amount is greater than the total increase in low wind speed type active power output, then within the current control cycle, all low wind speed type units are controlled to increase from the current actual active power output to the maximum active output on the MPPT curve under the wind speed condition, and it is determined whether the total power output of the offshore wind farm is balanced with the grid load demand after all low wind speed type units are increased from the current actual active power output to the maximum active output on the MPPT curve under the wind speed condition.

[0089] If it is determined that the total power output of the offshore wind farm is balanced with the grid load demand, the frequency of each wind turbine will no longer be adjusted during the current control cycle, and the power generation status of the wind turbine in the current control cycle will be maintained.

[0090] If the total power output is unbalanced with the grid load demand, in order to meet the frequency regulation requirements, it is necessary to increase the high wind speed type units for further adjustment, and obtain the difference between the power adjustment amount and the total increase in the low wind speed type active output as the high wind speed active output adjustment amount corresponding to the high wind speed type units.

[0091] The high wind speed active output regulation ΔP 高+ The calculation formula is:

[0092]

[0093] If all high wind speed units increase their current actual active power output to the maximum active output on the MPPT curve under the wind speed condition during the current control cycle, the total increase in active output of all high wind speed units will be taken as the total increase in high wind speed active output. The calculation formula is:

[0094]

[0095] Obtain a fourth ratio of the high wind speed active output adjustment amount to the total increase in high wind speed type active output, and increase the power of each high wind speed type unit according to the fourth ratio by adjusting the wind rotor pitch angle. Exemplarily, for any high wind speed type unit, increase the power by the active power output increase value corresponding to the high wind speed type unit The calculation formula is:

[0096]

[0097] in, For p ij The corresponding active power output increase value of the high wind speed type unit. For example, if the high wind speed type unit corresponding to the 3rd row and the 7th column corresponds to If the power is 60 MW, the high wind speed unit v corresponding to the 3rd row and 7th column is 37 The output power increased by 60 megawatts.

[0098] This application can determine whether there are critical output units by monitoring the real-time status information of each wind turbine in the offshore wind farm. In the case of critical output units, these units are controlled to be shut down to avoid their unstable impact on the power grid, which helps to improve the stability and reliability of the power grid; after all critical output units are shut down, the balance between the total power output of the offshore wind farm and the load demand of the power grid is determined. If the total power output is unbalanced with the load demand of the power grid, the power adjustment amount is calculated based on the gap between the load demand of the power grid and the actual active output of the offshore wind farm, and power-limiting control is performed in combination with low wind speed units and high wind speed units. This enables the offshore wind farm to accurately and flexibly adjust power generation according to actual needs, thereby improving power supply reliability and economic benefits. When combining low wind speed units and high wind speed units for power limiting control, since low wind speed units can adjust and recover power faster than high wind speed units, and electromagnetic torque is easier to control than mechanical torque, low wind speed units are given priority for power balance adjustment. If the adjustment of low wind speed units alone cannot meet the balance between total power output and grid load demand, high wind speed units are then used for power balance adjustment.

[0099] Figure 3is a schematic diagram of an offshore wind farm active power timing optimization control device shown in the present application, such as Figure 3 As shown, the offshore wind farm active power sequence optimization control device 300 includes a monitoring module 301, a control module 302, a judgment module 303, an acquisition module 304 and a power restriction module 305, wherein:

[0100] The monitoring module 301 is used to determine whether there is a critical output type unit in the offshore wind farm according to the real-time status information of each wind turbine unit in the offshore wind farm monitored in the current control cycle.

[0101] The control module 302 is used to control each critical output type unit to shut down if there is a critical output type unit, and obtain the first total active output reduction of the offshore wind farm after all critical output type units are shut down.

[0102] The judgment module 303 is used to judge whether the total power output of the offshore wind farm is balanced with the grid load demand after all critical output units are shut down. If the total power output is not balanced with the grid load demand, the maximum power generation power that can be provided by all units in the offshore wind farm that are connected to the grid is obtained. All units in the grid-connected state include low wind speed units and high wind speed units.

[0103] The acquisition module 304 is used to acquire the actual active power output of the offshore wind farm in the last control cycle if the grid load demand is less than the maximum power generation power that can be provided by all the units in the offshore wind farm in the grid-connected state.

[0104] The power limiting module 305 is used to obtain the difference between the grid load demand and the actual active output of the offshore wind farm in the previous control cycle, and use the sum of the difference and the first total active output reduction as the power adjustment amount corresponding to the offshore wind farm, and perform power limiting control based on the power adjustment amount in combination with the low wind speed type units and the high wind speed type units.

[0105] Furthermore, the offshore wind farm active power timing optimization control device 300 also includes: a setting module 306, which is used to define the types of wind turbines in the offshore wind farm, and define the wind turbines that have potential faults and need to be shut down and maintained as critical output units; define the units whose wind speed at the center of the hub is greater than the cut-in wind speed and less than the rated wind speed as low wind speed units, wherein the low wind speed units are in a grid-connected state; define the units whose wind speed at the center of the hub is greater than or equal to the rated wind speed as high wind speed units, wherein the high wind speed units are in a grid-connected state.

[0106] Furthermore, the power limiting module 305 is also used to: if the power regulation amount is less than or equal to zero, perform load reduction operation control based on the low wind speed type units and the high wind speed type units until the total power output of the offshore wind farm is balanced with the load demand of the power grid; if the power regulation amount is greater than zero, perform power increase control based on the low wind speed type units and the high wind speed type units until the total power output of the offshore wind farm is balanced with the load demand of the power grid.

[0107] Furthermore, the power limiting module 305 is also used to: use the output power of the wind turbine set at the cut-in wind speed as the minimum grid-connected power; obtain the total reduction in the second active power output of all low wind speed units when all low wind speed units are reduced from the current actual active power output to the minimum grid-connected power in the current control cycle; if the absolute value of the power regulation amount is less than or equal to the second total active power output reduction, obtain a first ratio of the absolute value of the power regulation amount to the second total active power output reduction, and reduce the power load of each low wind speed unit according to the first ratio by adjusting the electromagnetic torque; if the absolute value of the power regulation amount is greater than the second total active power output reduction, control all low wind speed units to reduce their current actual active power output to the grid-connected power in the current control cycle. The method comprises the following steps: determining the minimum power value, and determining whether the total power output of the offshore wind farm is balanced with the grid load demand after all low wind speed units are reduced from the current actual active power output to the minimum grid-connected power value; if the total power output is unbalanced with the grid load demand, obtaining the difference between the absolute value of the power regulation amount and the second total active output reduction amount as the high wind speed active output regulation amount corresponding to the high wind speed unit; obtaining the third total active output reduction amount of all high wind speed units reduced in total when all high wind speed units are reduced from the current actual active power output to the minimum grid-connected power value in the current control cycle; obtaining the second ratio of the high wind speed active output regulation amount to the third total active output reduction amount, and performing power reduction on each high wind speed unit according to the second ratio by adjusting the wind rotor pitch angle.

[0108] Furthermore, the power limiting module 305 is also used to: obtain the total increase in low wind speed type active power output of all the low wind speed type units when all the low wind speed type units increase from the current actual active power output to the maximum active power output in the current control cycle; if the power adjustment amount is less than or equal to the total increase in low wind speed type active power output, obtain a third ratio of the power adjustment amount to the total increase in low wind speed type active power output, and increase the power of each low wind speed type unit according to the third ratio by adjusting the electromagnetic torque; if the power adjustment amount is greater than the total increase in low wind speed type active power output, control all the low wind speed type units to increase from the current actual active power output to the maximum active power output in the current control cycle, and determine when all the low wind speed type units increase from the current actual active power output to the maximum Whether the total power output of the offshore wind farm is balanced with the grid load demand after the large active power output; if the total power output of the offshore wind farm is unbalanced with the grid load demand after all low wind speed units are increased from the current actual active power output to the maximum active output, obtain the difference between the power adjustment amount and the total increase in the low wind speed active output as the high wind speed active output adjustment amount corresponding to the high wind speed unit; obtain the total increase in the high wind speed active output of all high wind speed units when all high wind speed units are increased from the current actual active power output to the maximum active output in the current control cycle; obtain a fourth ratio of the high wind speed active output adjustment amount to the total increase in the high wind speed active output, and increase the power of each high wind speed unit according to the fourth ratio by adjusting the wind rotor pitch angle.

[0109] Furthermore, the acquisition module 304 is also used to: if the grid load demand is equal to the maximum power generation power that can be provided by all the units in the offshore wind farm that are connected to the grid, control all the units in the offshore wind farm that are connected to the grid to maintain maximum power tracking or rated power output state operation.

[0110] Furthermore, the acquisition module 304 is also used to: if the grid load demand is greater than the maximum power generation power that can be provided by all the units in the offshore wind farm that are connected to the grid, control all the units in the offshore wind farm that are connected to the grid to maintain maximum power tracking or rated power output operation; obtain the difference between the grid load demand and the maximum power generation power; and compensate for the difference based on other generator sets or energy storage devices other than the offshore wind farm.

[0111] Furthermore, the judgment module 303 is also used for: if it is judged that the total power output of the offshore wind farm is balanced with the load demand of the power grid, then the frequency of each wind turbine set is not adjusted in the current control cycle, and the power generation status of the wind turbine set in the current control cycle is maintained.

[0112] In order to implement the above embodiment, the present application embodiment also proposes an electronic device 400, such as Figure 4 As shown, the electronic device 400 includes: a processor 401 and a memory 402 that is communicatively connected to the processor, the memory 402 stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor 401 to implement the offshore wind farm active power timing optimization control method as shown in the above embodiment.

[0113] In order to implement the above embodiment, the embodiment of the present application also proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to implement the offshore wind farm active power timing optimization control method as shown in the above embodiment.

[0114] In order to implement the above embodiments, the embodiments of the present application further provide a computer program product, including a computer program, which, when executed by a processor, implements the offshore wind farm active power timing optimization control method as shown in the above embodiments.

[0115] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0116] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0117] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0118] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for optimizing active power sequence control in an offshore wind farm, characterized in that: include: According to the real-time status information of each wind turbine in the offshore wind farm monitored in the current control cycle, it is determined whether there is a critical output type unit in the offshore wind farm; If the critical output type unit exists, each of the critical output type units is controlled to be shut down, and a first total reduction in active power output of the offshore wind farm after all the critical output type units are shut down is obtained; Determine whether the total power output of the offshore wind farm is balanced with the grid load demand after all the critical output units are shut down; if the total power output is not balanced with the grid load demand, obtain the maximum power generation that can be provided by all the units in the offshore wind farm that are in a grid-connected state, wherein all the units in a grid-connected state include low wind speed units and high wind speed units; If the grid load demand is less than the maximum power generation power that can be provided by all units in the offshore wind farm currently connected to the grid, obtaining the actual active power output of the offshore wind farm in the previous control cycle; The difference between the grid load demand and the actual active output of the offshore wind farm in the previous control cycle is obtained, and the sum of the difference and the first total reduction in active output is used as the power regulation amount corresponding to the offshore wind farm, and power limitation control is performed based on the power regulation amount in combination with the low wind speed type unit and the high wind speed type unit.

2. The method according to claim 1, characterized in that Before judging whether there is a critical output type unit in the offshore wind farm according to the real-time status information of each wind turbine unit in the offshore wind farm monitored in the current control cycle, the method further includes: The types of wind turbines in the offshore wind farm are defined, and wind turbines that have potential faults and need to be taken out of operation and maintained are defined as critical output units; The unit whose wind speed at the hub center is greater than the cut-in wind speed and less than the rated wind speed is regarded as a low wind speed unit, wherein the low wind speed unit is in a grid-connected state; A unit whose wind speed at the center of the hub is greater than or equal to the rated wind speed is regarded as a high wind speed unit, wherein the high wind speed unit is in a grid-connected state.

3. The method according to claim 2, characterized in that The power limiting control based on the power adjustment amount combined with the low wind speed type unit and the high wind speed type unit includes: If the power adjustment amount is less than or equal to zero, load reduction operation control is performed based on the low wind speed type unit and the high wind speed type unit until the total power output of the offshore wind farm is balanced with the load demand of the power grid; If the power adjustment amount is greater than zero, power increase control is performed based on the low wind speed type unit and the high wind speed type unit until the total power output of the offshore wind farm is balanced with the grid load demand.

4. The method according to claim 3, characterized in that If the power adjustment amount is less than or equal to zero, load reduction operation control is performed based on the low wind speed type unit and the high wind speed type unit until the total power output of the offshore wind farm is balanced with the load demand of the power grid, including: The output power of the wind turbine at the cut-in wind speed is taken as the minimum grid-connected power; Obtaining a total reduction in the second active power output of all the low wind speed type units when the current actual active power output of all the low wind speed type units is reduced to the minimum grid-connected power value in the current control cycle; If the absolute value of the power adjustment amount is less than or equal to the second total active output reduction amount, a first ratio of the absolute value of the power adjustment amount to the second total active output reduction amount is obtained, and power load reduction is performed on each of the low wind speed type units according to the first ratio by adjusting the electromagnetic torque; If the absolute value of the power adjustment amount is greater than the second total active output reduction amount, all the low wind speed type units are controlled to reduce the current actual active power output to the minimum grid-connected power value within the current control cycle, and it is determined whether the total power output of the offshore wind farm is balanced with the grid load demand after all the low wind speed type units are reduced from the current actual active power output to the minimum grid-connected power value; If the total power output of the offshore wind farm is unbalanced with the grid load demand after all low wind speed units have reduced their current actual active power output to the minimum grid-connected power, the difference between the absolute value of the power adjustment amount and the second total active output reduction amount is obtained as the high wind speed active output adjustment amount corresponding to the high wind speed unit; Obtain the total reduction in the third active power output of all high wind speed units when all high wind speed units are reduced from the current actual active power output to the minimum grid-connected power in the current control cycle; A second ratio of the high wind speed active output adjustment amount to the third active output total reduction amount is obtained, and power load reduction is performed on each high wind speed type unit according to the second ratio by adjusting the wind rotor pitch angle.

5. The method according to claim 3, characterized in that: If the power adjustment amount is greater than zero, increasing power control is performed based on the low wind speed type unit and the high wind speed type unit until the total power output of the offshore wind farm is balanced with the grid load demand, including: Obtaining the total increase in low wind speed type active power output of all the low wind speed type units when the current actual active power output of all the low wind speed type units is increased to the maximum active power output in the current control cycle; If the power adjustment amount is less than or equal to the total increase in the low wind speed type active output, a third ratio of the power adjustment amount to the total increase in the low wind speed type active output is obtained, and the power of each low wind speed type unit is increased according to the third ratio by adjusting the electromagnetic torque; If the power adjustment amount is greater than the total increase in the low wind speed type active power output, all the low wind speed type units are controlled to increase from the current actual active power output to the maximum active power output within the current control cycle, and it is determined whether the total power output of the offshore wind farm is balanced with the grid load demand after all the low wind speed type units are increased from the current actual active power output to the maximum active power output; If the total power output of the offshore wind farm is unbalanced with the grid load demand after all low wind speed type units have increased their current actual active power output to the maximum active output, the difference between the power adjustment amount and the total increase in the low wind speed type active output is obtained as the high wind speed active output adjustment amount corresponding to the high wind speed type units; Obtain the total increase in high wind speed active power output of all high wind speed units when the current actual active power output of all high wind speed units is increased to the maximum active power output in the current control cycle; A fourth ratio of the high wind speed active output adjustment amount to the total increase in the high wind speed type active output is obtained, and the power of each high wind speed type unit is increased according to the fourth ratio by adjusting the wind rotor pitch angle.

6. The method according to claim 4 or 5, characterized in that: After obtaining the maximum power generation capacity that can be provided by all units in the offshore wind farm in a grid-connected state, the method further includes: If the grid load demand is equal to the maximum power generation power that can be provided by all grid-connected units in the offshore wind farm, all grid-connected units in the offshore wind farm are controlled to maintain maximum power tracking or rated power output state operation.

7. The method according to claim 4 or 5, characterized in that: After obtaining the maximum power generation capacity that can be provided by all units in the offshore wind farm in a grid-connected state, the method further includes: If the grid load demand is greater than the maximum power generation power that can be provided by all the units in the offshore wind farm that are in a grid-connected state, control all the units in the offshore wind farm that are in a grid-connected state to maintain maximum power tracking or rated power output state operation; Obtaining the difference between the grid load demand and the maximum power generation; The difference is compensated based on other power generation units or energy storage devices other than the offshore wind farm.

8. The method according to claim 4 or 5, characterized in that: The method further comprises: If it is determined that the total power output of the offshore wind farm is balanced with the load demand of the power grid, the frequency of each wind turbine is not adjusted in the current control cycle, and the power generation status of the wind turbine in the current control cycle is maintained.

9. An offshore wind farm active power sequence optimization control device, characterized in that: include; A monitoring module, used to determine whether there is a critical output type unit in the offshore wind farm according to the real-time status information of each wind turbine unit in the offshore wind farm monitored in the current control cycle; A control module, configured to control each of the critical output type units to stop operation if the critical output type units exist, and obtain a first total reduction in active power output of the offshore wind farm after all the critical output type units are stopped; A judgment module, used to judge whether the total power output of the offshore wind farm is balanced with the grid load demand after all the critical output units are shut down, and if the total power output is not balanced with the grid load demand, obtain the maximum power generation that can be provided by all the units in the offshore wind farm in a grid-connected state, wherein all the units in a grid-connected state include low wind speed units and high wind speed units; An acquisition module, configured to acquire the actual active power output of the offshore wind farm in the previous control cycle if the grid load demand is less than the maximum power generation power that can be provided by all units in the offshore wind farm currently connected to the grid; A power limiting module is used to obtain the difference between the grid load demand and the actual active output of the offshore wind farm in the previous control cycle, and use the sum of the difference and the first total reduction in active output as the power adjustment amount corresponding to the offshore wind farm, and perform power limiting control based on the power adjustment amount in combination with the low wind speed type unit and the high wind speed type unit.

10. An electronic device comprising: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 8.

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