Wind storage combined frequency modulation control method and system under out-of-control condition of fan

Abstract

The wind storage combined frequency modulation control method comprises the steps that a fan out-of-control model is constructed, and the running state of a fan and the frequency of a power grid are monitored in real time; judging whether the difference value between the current power grid frequency and the rated frequency is greater than or equal to a preset primary frequency modulation action dead zone, if so, executing primary frequency modulation response of output and frequency reduction control of the fan, and judging whether the fan is out of control or not, and if so, executing primary frequency modulation response of output and frequency reduction control of the fan based on the primary frequency modulation capability before the out-of-control fan is out of control. Calculating to obtain standby frequency modulation capacity requirements of the energy storage equipment, wherein the standby frequency modulation capacity requirements comprise a primary frequency modulation power requirement, a frequency modulation response time requirement and a standby frequency modulation electric quantity requirement; and selecting energy storage equipment meeting the standby frequency modulation capacity requirement in the centralized energy storage system, taking over the frequency modulation power vacancy corresponding to the out-of-control fan, and realizing coordinated frequency modulation control of the fan and the energy storage system until the power grid frequency recovery requirement is met. The reliability of the wind power plant participating in power grid frequency modulation under the abnormal working condition is improved.

Description

Technical Field

[0001] This invention belongs to the field of wind farm and energy storage system joint control technology, specifically relating to a wind-storage joint frequency regulation control method and system under wind turbine runaway. Background Technology

[0002] With the increasing penetration rate of new energy sources in the power system, the demand for wind farms to participate in grid frequency regulation is becoming increasingly urgent. However, the frequency regulation capability of wind farms is affected by factors such as equipment status, wind speed fluctuations, and communication conditions, which can easily lead to the loss of control of a single wind turbine, causing it to be unable to participate in frequency regulation normally, or even to act in the opposite direction of frequency regulation, affecting the safety and stability of the power grid.

[0003] In existing technologies, wind-storage joint frequency regulation mainly focuses on power distribution and response under normal wind turbine operating conditions, lacking emergency control strategies for situations where a single wind turbine fails. Especially in abnormal states such as wind turbine communication interruption and control failure, how to quickly and smoothly transfer the frequency regulation task to the energy storage system and ensure the safe recovery of the wind turbine remains a gap in current technology. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a wind-storage joint frequency regulation control method and system under wind turbine runaway conditions. By constructing a wind turbine runaway model, optimizing the energy storage backup frequency regulation capacity, and implementing wind-storage pairing and coordinated control, the reliability and safety of wind farms participating in grid frequency regulation under abnormal operating conditions are improved.

[0005] This invention adopts the following technical solution. A method and device for combined wind and energy storage frequency regulation control under wind turbine runaway, specifically including the following steps: In a first aspect, the present invention discloses a wind-storage combined frequency regulation control method under wind turbine runaway, comprising the following steps: Step 1: Construct a wind turbine runaway model and monitor the wind turbine's operating status and grid frequency in real time; Step 2: Determine whether the difference between the current grid frequency and the rated frequency is greater than or equal to the preset primary frequency regulation dead zone. If it is greater, proceed to Step 3; otherwise, return to Step 1. Step 3: Execute the primary frequency regulation response of the wind turbine output reduction and frequency reduction control, and determine whether there is wind turbine runaway based on the wind turbine runaway model and wind turbine operating status. If there is, proceed to step 4; otherwise, the wind-storage cluster will complete the primary frequency regulation normally and return to step 1. Step 4: Based on the primary frequency regulation capability of the runaway wind turbine before it goes out of control, calculate the backup frequency regulation capacity requirement of the energy storage device. The backup frequency regulation capacity requirement includes the primary frequency regulation power requirement, the frequency regulation response time requirement, and the backup frequency regulation power requirement. Step 5: Select an energy storage device in the centralized energy storage system that meets the required standby frequency regulation capacity, take over the frequency regulation power deficit corresponding to the runaway wind turbine, realize coordinated frequency regulation control between the wind turbine and the energy storage system, and return to Step 1 after the frequency regulation meets the grid frequency recovery requirements.

[0006] More preferably, In step 1, the wind turbine runaway model includes: determining that the wind turbine has entered a runaway state based on at least one of the following: wind turbine fault signal, communication interruption signal, control failure signal, frequency modulation lockout signal, and non-remote control status signal.

[0007] More preferably, In step 4, the primary frequency regulation capability of the runaway fan before it went out of control is the maximum regulating power that the fan could participate in primary frequency regulation before it went out of control, and it is determined in the following way:

[0008] in, This is the maximum regulating power that the runaway fan can participate in primary frequency regulation before it goes out of control. It is the adjustable power margin of the fan before the speed protection trips after the frequency regulation is completed. It is the inertial response power of the wind turbine. It is the current power grid frequency. With power grid frequency rating The difference, It is the preset dead zone for one frequency modulation action. The frequency modulation power constrained by the scheduling protocol accounts for the percentage of the rated power. The proportion; The inertial response power of the wind turbine is determined as follows:

[0009] in, The generator inertial time constant issued by the dispatch center. This is the rated power of the fan.

[0010] More preferably, In step 4, the primary frequency regulation power requirement in the backup frequency regulation capacity requirement of the energy storage device specifically includes: the maximum absorption power of the energy storage device. It needs to meet the following requirements. .

[0011] More preferably, In step 4, the frequency modulation response time requirement specifically includes: From receiving frequency modulation commands to absorbing power, the energy storage device... Time required It needs to meet the following requirements. Energy storage devices maintain power Duration , must meet ;in, The preset primary frequency modulation power response time threshold, This is the total duration of a single frequency modulation, and it must meet the following requirements. .

[0012] More preferably, In step 4, the required backup frequency modulation power specifically includes: Frequency regulation power required for energy storage devices Calculated as follows:

[0013] The current SOC value of the energy storage device must meet the following requirements. ;in, The rated capacity of the energy storage device. This is the health status coefficient of the energy storage device.

[0014] More preferably, In step 5, if multiple energy storage devices in the centralized energy storage system meet the required standby frequency regulation capacity, they are scored as follows, and the device with the highest score is selected to take over the frequency regulation power deficit corresponding to the runaway wind turbine. The scoring formula is as follows:

[0015] in, , and For the weight coefficients corresponding to each scoring item, satisfying ,and .

[0016] Secondly, the present invention discloses a wind-storage joint frequency regulation control system based on the aforementioned method under wind turbine runaway, including a monitoring module, a primary frequency regulation action triggering module, a wind turbine primary frequency regulation response and runaway state judgment module, an energy storage backup frequency regulation capacity demand calculation module, and a wind-storage coordinated frequency regulation control module. The monitoring module constructs a wind turbine runaway model and monitors the wind turbine's operating status and grid frequency in real time. The primary frequency regulation action trigger module determines whether the difference between the current grid frequency and the rated frequency is greater than or equal to the preset primary frequency regulation action dead zone. If it is greater, it enters the wind turbine primary frequency regulation response and runaway state judgment module; otherwise, it returns to the monitoring module. The wind turbine primary frequency regulation response and runaway state judgment module executes the primary frequency regulation response of the wind turbine output reduction and frequency reduction control, and judges whether there is a wind turbine runaway based on the wind turbine runaway model and the wind turbine operating status. If there is, it enters the energy storage backup frequency regulation capacity demand calculation module; otherwise, the wind-storage cluster completes the primary frequency regulation normally and returns to the monitoring module. The energy storage backup frequency regulation capacity requirement calculation module calculates the backup frequency regulation capacity requirement of the energy storage equipment based on the primary frequency regulation capability of the runaway wind turbine before it goes out of control. The backup frequency regulation capacity requirement includes the primary frequency regulation power requirement, the frequency regulation response time requirement, and the backup frequency regulation power requirement. The wind-storage coordinated frequency regulation control module, based on the aforementioned backup frequency regulation capacity requirements, matches energy storage devices with corresponding backup frequency regulation capacity requirements in the centralized energy storage system, takes over the frequency regulation power deficit corresponding to the runaway wind turbine, realizes coordinated frequency regulation control between the wind turbine and the energy storage system, and returns to the monitoring module after the frequency regulation meets the grid frequency recovery requirements.

[0017] Thirdly, the present invention provides a terminal, including a processor and a storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of the first aspects of the present invention.

[0018] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of the first aspects of the present invention.

[0019] The beneficial effects of this invention are that, compared with the prior art, This invention addresses the typical but long-overlooked abnormal condition of wind turbine runaway during grid frequency regulation in wind farms. It proposes a wind-storage joint frequency regulation control method, using a wind turbine runaway model as the trigger condition and an energy storage system as the core regulating resource. Existing wind-storage joint frequency regulation technologies generally assume that the wind turbine is in a normal and controllable state. Their frequency regulation strategies mainly revolve around power distribution and response optimization between the wind turbine and energy storage under normal operating conditions. When a single wind turbine malfunctions, communication is interrupted, or control fails, the only solutions are often to exit frequency regulation or simple blocking, which cannot guarantee the continuity and safety of the frequency regulation process and may even lead to risks such as reversed frequency regulation direction or sudden power changes.

[0020] This invention introduces a set of wind turbine runaway conditions to assess various abnormal states, including turbine malfunction, communication interruption, continuous control failure, frequency regulation lockout, and non-remote control. This enables the system to immediately enter the wind-storage system coordinated control mode under wind turbine runaway conditions. Simultaneously, based on the primary frequency regulation capability of the runaway wind turbine, this invention online adjusts the energy storage backup frequency regulation capacity and SOC boundary, ensuring the energy storage system has sufficient and quantifiable frequency regulation capability reserves in wind turbine runaway scenarios. This guarantees that both primary frequency regulation power and frequency regulation duration meet grid dispatch requirements.

[0021] Furthermore, this invention proposes a pairing and coordinated control mechanism for wind turbines and energy storage. When a single wind turbine malfunctions, the energy storage system takes over its frequency regulation task in the frequency regulation link, comprehensively considering the inertia characteristics of the wind turbine itself to achieve stable frequency regulation control under wind-storage synergy. This control method differs from existing technologies that simply rely on independent frequency regulation by energy storage or reduce the overall output of the wind farm. It can ensure grid frequency stability while minimizing the impact on the normal operation of wind turbines.

[0022] In summary, this invention not only improves the reliability and continuity of wind farms participating in grid frequency regulation under abnormal operating conditions, but also fully leverages the advantages of energy storage systems in rapid response and fine regulation. It provides a safe, controllable, and engineering-feasible wind-storage joint frequency regulation solution for grids with high renewable energy penetration, demonstrating significant technological advancements and engineering application value. Attached Figure Description

[0023] Figure 1 This is a schematic flowchart of a wind-storage combined frequency regulation control method under wind turbine runaway according to the present invention; Figure 2 This is a schematic diagram of the system structure of the present invention in Embodiment 2. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0025] As attached Figure 1 As shown, this invention discloses a wind-storage combined frequency regulation control method under wind turbine runaway, comprising the following steps: Step 1: Construct a wind turbine runaway model and monitor the wind turbine's operating status and grid frequency in real time; The wind turbine runaway model includes determining that the wind turbine has entered a runaway state based on at least one of the following: wind turbine fault signal, communication interruption signal, control failure signal, frequency modulation lockout signal, and non-remote control status signal.

[0026] Step 2: Determine whether the difference between the current grid frequency and the rated frequency is greater than or equal to the preset primary frequency regulation dead zone. If it is greater, proceed to Step 3; otherwise, return to Step 1. Step 3: Execute the primary frequency regulation response of the wind turbine output reduction and frequency reduction control, and determine whether there is wind turbine runaway based on the wind turbine runaway model and wind turbine operating status. If there is, proceed to step 4; otherwise, the wind-storage cluster will complete the primary frequency regulation normally and return to step 1. The wind-storage cluster normally coordinates to complete one frequency regulation, specifically as follows: The wind turbine adjusts its active power output based on its adjustable power margin and inertia response capability to participate in primary frequency regulation by reducing active power, thereby achieving frequency reduction control. When the wind turbine has insufficient frequency regulation capability or limited response speed, the energy storage system compensates for the lack of frequency regulation power by outputting corresponding adjustable power, and works with the wind turbine to complete primary frequency regulation.

[0027] Step 4: Based on the primary frequency regulation capability of the runaway wind turbine before it goes out of control, calculate the backup frequency regulation capacity requirement of the energy storage device. The backup frequency regulation capacity requirement includes the primary frequency regulation power requirement, the frequency regulation response time requirement, and the backup frequency regulation power requirement. The frequency regulation capability of the runaway fan before it went out of control is the maximum regulating power that the fan could participate in primary frequency regulation before it went out of control, and it is determined in the following way:

[0028] in, This is the maximum regulating power that the runaway fan can participate in primary frequency regulation before it goes out of control. It is the adjustable power margin of the fan before the speed protection trips after the frequency regulation is completed. It is the inertial response power of the wind turbine. It is the current power grid frequency. With power grid frequency rating The difference, It is the preset dead zone for one frequency modulation action. The frequency modulation power constrained by the scheduling protocol accounts for the percentage of the rated power. The proportion; The inertial response power of the wind turbine is determined as follows:

[0029] in, The generator inertial time constant issued by the dispatch center. This is the rated power of the fan.

[0030] The primary frequency regulation power requirement in the backup frequency regulation capacity requirement for energy storage devices specifically includes: the maximum absorption power of the energy storage device. It needs to meet the following requirements. .

[0031] The frequency modulation response time requirement specifically includes: From receiving frequency modulation commands to absorbing power, the energy storage device... Time required It needs to meet the following requirements. Energy storage devices maintain power Duration , must meet ;in, The preset primary frequency modulation power response time threshold, This is the total duration of a single frequency modulation, and it must meet the following requirements. .

[0032] The required backup frequency modulation power capacity specifically includes: Frequency regulation power required for energy storage devices Calculated as follows:

[0033] The current SOC value of the energy storage device must meet the following requirements. ;in, The rated capacity of the energy storage device. This is the health status coefficient of the energy storage device.

[0034] Step 5: Select an energy storage device in the centralized energy storage system that meets the required standby frequency regulation capacity, take over the frequency regulation power deficit corresponding to the runaway wind turbine, realize coordinated frequency regulation control between the wind turbine and the energy storage system, and return to Step 1 after the frequency regulation meets the grid frequency recovery requirements.

[0035] If multiple energy storage devices in a centralized energy storage system meet the required backup frequency regulation capacity, they will be scored as follows, and the device with the highest score will be selected to take over the frequency regulation power deficit corresponding to the runaway wind turbine. The scoring formula is as follows:

[0036] in, , and For the weight coefficients corresponding to each scoring item, satisfying ,and .

[0037] Example 1: As attached Figure 1As shown, the present invention provides a wind-storage combined frequency regulation control method under wind turbine runaway, characterized by comprising the following steps: Step 1: Construct a wind turbine runaway model and monitor the wind turbine's operating status and grid frequency in real time; The wind turbine runaway model is constructed based on conventional methods for determining wind turbine runaway. The construction method is as follows: combining the operating parameter characteristics (including wind turbine output power, speed, control command feedback signal, unit status code, etc.) corresponding to typical wind turbine runaway scenarios (such as unit failure, communication interruption, control failure, frequency modulation lockout, and non-remote control status), and establishing a mapping relationship model between the real-time operating status and runaway status of the wind turbine by associating the above operating parameters with the characteristic thresholds of the runaway scenarios, so as to realize the real-time determination of whether the wind turbine is out of control.

[0038] Furthermore, the wind turbine runaway model includes: determining that the wind turbine has entered a runaway state based on at least one of the following: wind turbine fault signal, communication interruption signal, control failure signal, frequency modulation lockout signal, and non-remote control status signal.

[0039] Step 2: Determine whether the difference between the current grid frequency and the rated frequency is greater than or equal to the preset primary frequency regulation dead zone. If it is greater, proceed to Step 3; otherwise, return to Step 1. Step 3: Execute the primary frequency regulation response of the wind turbine output reduction and frequency reduction control, and determine whether there is wind turbine runaway based on the wind turbine runaway model and wind turbine operating status. If there is, proceed to step 4; otherwise, the wind-storage cluster will complete the primary frequency regulation normally and return to step 1. Based on the pre-established wind turbine runaway model, the runaway wind turbine state is identified, and the wind turbine is virtually matched with the centralized energy storage system. Taking into account the wind turbine's own inertia characteristics and wind speed differences, the energy storage system takes over the frequency regulation power demand corresponding to the runaway wind turbine, realizing coordinated frequency regulation control between the wind turbine and the energy storage system, and ensuring grid frequency stability.

[0040] The wind-storage cluster normally coordinates to complete one frequency regulation, specifically as follows: The wind turbine adjusts its active power output based on its adjustable power margin and inertia response capability to participate in primary frequency regulation by reducing active power, thereby achieving frequency reduction control. When the wind turbine has insufficient frequency regulation capability or limited response speed, the energy storage system compensates for the lack of frequency regulation power by outputting corresponding adjustable power, and works with the wind turbine to complete primary frequency regulation.

[0041] Step 4: Based on the primary frequency regulation capability of the runaway wind turbine before it goes out of control, calculate the backup frequency regulation capacity requirement of the energy storage device. The backup frequency regulation capacity requirement includes the primary frequency regulation power requirement, the frequency regulation response time requirement, and the backup frequency regulation power requirement. The primary frequency regulation capability of the runaway fan before it went out of control is the maximum regulating power that the fan could participate in primary frequency regulation before it went out of control. It is determined in the following way:

[0042] In the formula, This is the maximum regulating power that the runaway fan can participate in primary frequency regulation before it goes out of control. It is the adjustable power margin of the fan before the speed protection trips after the frequency regulation is completed. It is the inertial response power of the wind turbine. It is the current power grid frequency. With the rated value difference, It is a frequency modulation dead zone. The frequency modulation power constrained by the scheduling protocol accounts for the percentage of the rated power. The proportion.

[0043] Since this invention only considers the scenario of reduced wind turbine output and frequency reduction control when the grid frequency is too high, the primary frequency regulation capability before the runaway wind turbine goes out of control is not considered. The situation.

[0044] Furthermore, ,in, The generator inertial time constant issued by the dispatch center. This is the rated power of the fan.

[0045] Because the power absorption range of energy storage devices is Therefore, when the maximum absorption power of the energy storage device satisfy Only when the energy storage power margin is sufficient to meet the frequency regulation power requirements can it participate in system frequency regulation.

[0046] Furthermore, when a single wind turbine goes out of control, the energy storage device needs to participate in frequency regulation for a period of time that satisfies the following formula:

[0047] in, To achieve the power absorption of energy storage Time, To maintain the absorbed power for energy storage Time, The settling time of a single frequency modulation is given, and it satisfies the following conditions: ; The preset primary frequency modulation power response time threshold is preferably 5s in this embodiment.

[0048] The power curve is approximately linear, and its slope meets the scheduling requirements. After the wind farm enters the secondary frequency regulation stage, energy storage will be approximately equal to Within a certain time frame, the frequency regulation power absorbed by the energy storage device is [amount missing]. ,Right now .

[0049] Therefore, the SOC value corresponding to the standby frequency regulation capacity of energy storage equipment in a wind farm cannot exceed [the specified value]. 0.95 is the upper limit for the safety of energy storage charging. The rated capacity of the energy storage device. This refers to the health status of energy storage devices.

[0050] More preferably, if the energy storage system's centralized configuration of its frequency regulation power and electricity demand can meet the frequency regulation requirements when multiple wind turbines simultaneously fail, the frequency regulation capability of each failed wind turbine can be calculated to determine the frequency regulation capacity of the backup energy storage device. Specifically, the coordinating controller detects the wind turbines within its detection range, determines their controllability, and calculates the total frequency regulation capacity required for each failed wind turbine. and the total power required for frequency modulation This allows for the determination of backup energy storage frequency regulation capacity and power matching.

[0051] Step 5: Select an energy storage device in the centralized energy storage system that meets the required standby frequency regulation capacity, take over the frequency regulation power deficit corresponding to the runaway wind turbine, realize coordinated frequency regulation control between the wind turbine and the energy storage system, and return to Step 1 after the frequency regulation meets the grid frequency recovery requirements.

[0052] The matching method for the centralized energy storage system with energy storage devices having corresponding backup frequency regulation capacity requirements specifically includes: Primary basic constraint screening: Prioritize screening energy storage devices that meet the following basic conditions, including: the maximum absorption power of the energy storage device. The current SOC value of the energy storage device meets the requirements. ; Secondary time-based filtering: Among the devices that meet the primary basic constraints, further screening is conducted for pure functional devices that meet the time requirements, including: From receiving the frequency regulation command to absorbing power reaching the maximum regulation power that the energy storage device can participate in primary frequency regulation before the fan goes out of control. Time required ,satisfy The energy storage device maintains the power. Duration No more than the total duration of one frequency modulation. and The difference; Final overall matching: If multiple devices meet the criteria, a multi-dimensional scoring method is used to determine the optimal device, selecting the device with the highest score. The specific scoring formula is as follows:

[0053] in, , and For the weight coefficients corresponding to each scoring item, satisfying ,and .

[0054] Frequency regulation meets the requirements for power grid frequency recovery, specifically: the real-time power grid frequency is restored to the rated frequency ±0.05Hz and stabilized for 3 seconds.

[0055] Example 2: To more clearly illustrate the outstanding substantive features of this invention and the significant progress it brings to the prior art, an application example of implementing this invention is described below.

[0056] like Figure 2 As shown, the system of this invention includes wind turbines, energy storage, a coordination controller, and a higher-level dispatching system. The coordination controller monitors the status of each wind turbine, the state of charge (SOC) of the energy storage, the electrical quantities at the grid connection point, and dispatching instructions in real time, and executes power response according to a preset strategy.

[0057] A wind farm with an installed capacity of 30MW consists of six 5MW wind turbines and is equipped with a 1MW / 0.1MWh power-type energy storage system. During operation, a 5MW wind turbine enters an uncontrolled state due to a communication interruption. At this time, the frequency of the wind farm's grid connection point exceeds the upper limit, and the turbine output needs to be reduced.

[0058] The coordinating controller detected the wind turbine's malfunction and immediately activated the energy storage system to take over its frequency regulation task. The total output power of the wind turbine under frequency regulation was calculated. ,like It is 4MW. =0.8MW, According to the standard, the power consumption should not be less than 10%, so we take 10% here. The calculated frequency regulation power required by the energy storage is approximately 0.48MW (energy storage absorption power). If the energy storage system reaches this power within 3 seconds and maintains it for 25 seconds, the total charging capacity is approximately 3.73kWh. Assuming a configuration where half of the wind turbines fail, when the battery health status is 1, at least 0.9MW / 11.19kWh of reserve capacity should be reserved.

[0059] After a frequency regulation cycle ends, the energy storage system smoothly disengages within 5 seconds, and the wind turbine speed gradually recovers. The coordinating controller blocks the frequency regulation command for that wind turbine to prevent sudden power fluctuations. Once the wind turbine speed returns to a safe range, it re-enters maximum power point tracking mode.

[0060] This embodiment demonstrates that the present invention can enable the energy storage system to quickly and smoothly take over the frequency regulation task in the event of a single wind turbine failure, thereby ensuring the stability of the power grid frequency and the safe operation of the wind turbine.

[0061] Example 3: An embodiment of the present invention provides a terminal, including a processor and a storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of Embodiment 1.

[0062] Example 4: The present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of the embodiments.

[0063] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0064] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0065] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0066] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A wind-storage combined frequency regulation control method under wind turbine runaway, characterized in that, Includes the following steps: Step 1: Construct a wind turbine runaway model and monitor the wind turbine's operating status and grid frequency in real time; Step 2: Determine whether the difference between the current grid frequency and the rated frequency is greater than or equal to the preset primary frequency regulation dead zone. If it is greater, proceed to Step 3; otherwise, return to Step 1. Step 3: Execute the primary frequency regulation response of the wind turbine output reduction and frequency reduction control, and determine whether there is wind turbine runaway based on the wind turbine runaway model and wind turbine operating status. If there is, proceed to step 4; otherwise, the wind-storage cluster will complete the primary frequency regulation normally and return to step 1. Step 4: Based on the primary frequency regulation capability of the runaway wind turbine before it goes out of control, calculate the backup frequency regulation capacity requirement of the energy storage device. The backup frequency regulation capacity requirement includes the primary frequency regulation power requirement, the frequency regulation response time requirement, and the backup frequency regulation power requirement. Step 5: Select an energy storage device in the centralized energy storage system that meets the required standby frequency regulation capacity, take over the frequency regulation power deficit corresponding to the runaway wind turbine, realize coordinated frequency regulation control between the wind turbine and the energy storage system, and return to Step 1 after the frequency regulation meets the grid frequency recovery requirements.

2. The wind-storage combined frequency regulation control method under wind turbine runaway as described in claim 1, characterized in that: In step 1, the wind turbine runaway model includes: determining that the wind turbine has entered a runaway state based on at least one of the following: wind turbine fault signal, communication interruption signal, control failure signal, frequency modulation lockout signal, and non-remote control status signal.

3. The wind-storage combined frequency regulation control method under wind turbine runaway as described in claim 1, characterized in that: In step 4, the primary frequency regulation capability of the runaway fan before it went out of control is the maximum regulating power that the fan could participate in primary frequency regulation before it went out of control, and it is determined in the following way: in, This is the maximum regulating power that the runaway fan can participate in primary frequency regulation before it goes out of control. It is the adjustable power margin of the fan before the speed protection trips after the frequency regulation is completed. It is the inertial response power of the wind turbine. It is the current power grid frequency. With power grid frequency rating The difference, It is the preset dead zone for one frequency modulation action. The frequency modulation power constrained by the scheduling protocol accounts for the percentage of the rated power. The proportion; The inertial response power of the wind turbine is determined as follows: in, The generator inertial time constant issued by the dispatch center. This is the rated power of the fan.

4. The wind-storage combined frequency regulation control method under wind turbine runaway as described in claim 3, characterized in that: In step 4, the primary frequency regulation power requirement in the backup frequency regulation capacity requirement of the energy storage device specifically includes: the maximum absorption power of the energy storage device. It needs to meet the following requirements. .

5. The wind-storage combined frequency regulation control method under wind turbine runaway as described in claim 4, characterized in that: In step 4, the frequency modulation response time requirement specifically includes: From receiving frequency modulation commands to absorbing power, the energy storage device... Time required It needs to meet the following requirements. Energy storage devices maintain power Duration , must meet ;in, The preset primary frequency modulation power response time threshold, This is the total duration of a single frequency modulation, and it must meet the following requirements. .

6. The wind-storage combined frequency regulation control method under wind turbine runaway as described in claim 5, characterized in that: In step 4, the required backup frequency modulation power specifically includes: Frequency regulation power required for energy storage devices Calculated as follows: The current SOC value of the energy storage device must meet the following requirements. ;in, The rated capacity of the energy storage device. This is the health status coefficient of the energy storage device.

7. The wind-storage combined frequency regulation control method under wind turbine runaway as described in claim 6, characterized in that: In step 5, if multiple energy storage devices in the centralized energy storage system meet the required standby frequency regulation capacity, they are scored as follows, and the device with the highest score is selected to take over the frequency regulation power deficit corresponding to the runaway wind turbine. The scoring formula is as follows: in, , and For the weight coefficients corresponding to each scoring item, satisfying ,and .

8. A wind-storage joint frequency regulation control system under wind turbine runaway based on the method of any one of claims 1-7, comprising a monitoring module, a primary frequency regulation action triggering module, a wind turbine primary frequency regulation response and runaway state judgment module, an energy storage backup frequency regulation capacity demand calculation module, and a wind-storage coordinated frequency regulation control module, characterized in that: The monitoring module constructs a wind turbine runaway model and monitors the wind turbine's operating status and grid frequency in real time. The primary frequency regulation action trigger module determines whether the difference between the current grid frequency and the rated frequency is greater than or equal to the preset primary frequency regulation action dead zone. If it is greater, it enters the wind turbine primary frequency regulation response and runaway state judgment module; otherwise, it returns to the monitoring module. The wind turbine primary frequency regulation response and runaway state judgment module executes the primary frequency regulation response of the wind turbine output reduction and frequency reduction control, and judges whether there is a wind turbine runaway based on the wind turbine runaway model and the wind turbine operating status. If there is, it enters the energy storage backup frequency regulation capacity demand calculation module; otherwise, the wind-storage cluster completes the primary frequency regulation normally and returns to the monitoring module. The energy storage backup frequency regulation capacity requirement calculation module calculates the backup frequency regulation capacity requirement of the energy storage equipment based on the primary frequency regulation capability of the runaway wind turbine before it goes out of control. The backup frequency regulation capacity requirement includes the primary frequency regulation power requirement, the frequency regulation response time requirement, and the backup frequency regulation power requirement. The wind-storage coordinated frequency regulation control module, based on the aforementioned backup frequency regulation capacity requirements, matches energy storage devices with corresponding backup frequency regulation capacity requirements in the centralized energy storage system, takes over the frequency regulation power deficit corresponding to the runaway wind turbine, realizes coordinated frequency regulation control between the wind turbine and the energy storage system, and returns to the monitoring module after the frequency regulation meets the grid frequency recovery requirements.

9. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 1-7.

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