Energy storage and offshore wind turbine combined control method and system and storage medium

Abstract

The invention discloses an energy storage and offshore wind turbine combined control method and system and a storage medium, and belongs to the field of electric power control. Effective utilization of the electric quantity of the energy storage system is prevented from being affected by manual operation delay, and the power supply mode of the energy storage converter can be controlled, for example, when the offshore wind turbine system is switched to the island operation mode, the energy storage converter is controlled to only supply power to the offshore wind turbine system; when whether the offshore wind turbine system is switched to the island operation mode is not confirmed, the energy storage converter is directly controlled to stop supplying power to the power grid system, so that unnecessary power consumption is reduced, more power can be reserved for energy storage, enough power is provided for the offshore wind turbine, and the service life of the offshore wind turbine system is prolonged. And stable operation of the offshore wind turbine system in typhoon weather is guaranteed. According to the invention, the problem that enough power support cannot be provided for the offshore wind turbine in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the field of power control, and particularly to a combined control method, system, and storage medium for energy storage and offshore wind turbines. Background Art

[0002] Under extreme weather conditions such as typhoons, the power grid may be severely affected, resulting in voltage fluctuations, current instability, or even power supply interruption. Energy storage systems are often required to provide stable backup power support for the main control and yaw systems of wind turbines in offshore wind power systems to enhance the typhoon resistance of offshore wind power systems. To ensure the power demand of offshore wind turbine systems under extreme weather conditions, it is necessary to control the energy storage system to stop supplying power to the power grid during typhoons, so as to reserve more power for the operation of the offshore wind turbine system and avoid shutdown or failure of the offshore wind turbine system due to insufficient power.

[0003] However, the existing control methods for energy storage systems often rely on manual operation to control the power supply mode of the energy storage system. For example, after the operator notices that a typhoon has occurred and the offshore wind turbine system has switched from the grid-connected power generation mode to the island operation mode, the operator manually controls the energy storage converter in the energy storage system to supply power to the offshore wind turbine, and the automatic control of the power supply mode of the energy storage converter cannot be achieved. During the process of judging whether the offshore wind turbine system has switched to the island operation mode, the energy storage system will continuously supply power to the power grid, resulting in continuous consumption of the power of the energy storage system and possibly being unable to provide sufficient power support for the offshore wind turbine.

[0004] Therefore, under extreme weather conditions such as typhoons, the existing technology cannot effectively control the power supply mode of the energy storage system, resulting in the continuous consumption of the power of the energy storage converter in unnecessary time, and the offshore wind turbine system may not be able to operate stably due to insufficient power during typhoon weather. Summary of the Invention

[0005] The embodiments of the present invention provide a combined control method, system, and storage medium for energy storage and offshore wind turbines, which can directly interrupt the power supply of the energy storage converter to the power grid when it is not confirmed whether the offshore wind turbine system has switched to the island operation mode, reduce unnecessary power consumption, and provide sufficient power support for the offshore wind turbine, effectively solving the problem that in the existing technology, due to the inability to effectively control the power supply mode of the energy storage system, the offshore wind turbine system may not be able to operate stably due to insufficient power during typhoon weather.

[0006] An embodiment of the present invention provides a combined control method for energy storage and offshore wind turbines, including:

[0007] When it is determined that the power grid system has completed power-off after a typhoon, an off-grid request signal for requesting the offshore wind turbine system to switch from grid-connected power generation mode to island operation mode is sent to the offshore wind turbine system, so that the offshore wind turbine system switches the operation mode and returns an off-grid permission signal; wherein, the off-grid permission signal is used to represent the signal that the offshore wind turbine system has completed the switch from grid-connected power generation mode to island operation mode;

[0008] Repeat the off-grid determination operation to perform joint control of the offshore wind turbines;

[0009] The off-grid determination operation includes:

[0010] Judge whether the off-grid permission signal is received within the first preset time period after the off-grid request signal is sent;

[0011] If so, control the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system;

[0012] If not, judge whether the energy storage converter in the energy storage system has stopped supplying power to the power grid system. When it is determined that the energy storage converter has stopped supplying power to the power grid system, resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system re-feeds the off-grid permission signal;

[0013] When it is determined that the energy storage converter has not stopped supplying power to the power grid system, control the energy storage converter in the energy storage system to stop supplying power to the power grid system, and resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system re-feeds the off-grid permission signal.

[0014] Preferably, it further includes:

[0015] When it is determined that the power grid system has not completed power-off after a typhoon, judge whether the current first power of the energy storage system is not less than the first preset power threshold;

[0016] If not, charge the energy storage system;

[0017] If so, re-judge whether the power grid system has completed power-off after a typhoon.

[0018] Preferably, after controlling the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system, it further includes:

[0019] Obtain the current second power of the energy storage system;

[0020] When it is determined that the second power is less than the second preset power threshold, send a first warning signal indicating low power to the offshore wind turbine system, and then judge whether the offshore wind turbine system has completed the wind turbine yaw control operation; wherein, the second preset power threshold is less than the first preset power threshold;

[0021] If so, control the energy storage converter in the energy storage system to enter the shutdown state;

[0022] If not, obtain the current third power quantity of the energy storage system. When it is determined that the third power quantity is less than the third preset power quantity threshold, send a second warning signal indicating that the power quantity cannot meet the yaw control operation of the wind turbine to the offshore wind turbine system, and control the energy storage converter in the energy storage system to enter the shutdown state after a second preset time period; when it is determined that the third power quantity is not less than the third preset power quantity threshold, re-determine whether the offshore wind turbine system has completed the yaw control operation of the wind turbine;

[0023] Wherein, the third preset power quantity threshold is less than the second preset power quantity threshold; the second preset time period is less than the first preset time period.

[0024] Preferably, after controlling the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system, it further includes:

[0025] Send a heartbeat packet for verifying whether there is a communication link between the energy storage system and the offshore wind turbine system to the offshore wind turbine system according to a preset time interval;

[0026] When it is determined that no heartbeat response is received from the offshore wind turbine system within the first preset time period, control the energy storage converter in the energy storage system to enter the shutdown state after a second preset time period;

[0027] When it is determined that a heartbeat response has been received from the offshore wind turbine system within the first preset time period, re-send the heartbeat packet to the offshore wind turbine system according to the preset time interval.

[0028] Preferably, after controlling the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system, it further includes:

[0029] When it is determined that a yaw completion signal sent by the offshore wind turbine system has been received, control the energy storage converter in the energy storage system to enter the shutdown state;

[0030] Wherein, the yaw completion signal is used to indicate that the offshore wind turbine system has completed the yaw control operation of the wind turbine.

[0031] Preferably, after controlling the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system, it further includes:

[0032] Judge whether a typhoon disappearance signal indicating that the typhoon has disappeared is received;

[0033] If so, when it is determined that a grid connection operation request signal sent by the power grid system has been received, control the energy storage converter in the energy storage system to supply power to the power grid system; wherein, the grid connection operation request signal is a signal used to indicate that the power grid system requests the energy storage system to supply power to the power grid system;

[0034] If not, re-determine whether a typhoon disappearance signal is received.

[0035] Preferably, before sending an off-grid request signal for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode to the offshore wind turbine system, it further includes:

[0036] When it is determined that a typhoon warning signal for indicating that a typhoon will occur after a third preset time period is received, determine whether the current fourth power of the energy storage system is not less than a first preset power threshold; wherein, the third preset time period is greater than the first preset time period;

[0037] If not, charge the energy storage system;

[0038] If so, re-determine whether the power grid system has completed power-off after the typhoon occurs.

[0039] Based on the above method embodiments, the present invention correspondingly provides system embodiments.

[0040] An embodiment of the present invention provides a combined control system for energy storage and an offshore wind turbine, including: an energy storage coordination controller, an offshore wind turbine system, and a power grid system;

[0041] The power grid system is configured to generate a power grid power-off signal and send the power grid power-off signal to the energy storage coordination controller; wherein, the power grid power-off signal is a signal for indicating that a typhoon has occurred and the power grid system has completed power-off;

[0042] The energy storage coordination controller is configured to send an off-grid request signal for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode to the offshore wind turbine system after receiving the power grid power-off signal;

[0043] The offshore wind turbine system is configured to switch the operation mode of the offshore wind turbine system to the island operation mode after receiving the off-grid request signal, and then return an off-grid permission signal; wherein, the off-grid permission signal is a signal for indicating that the offshore wind turbine system has completed switching from the grid-connected power generation mode to the island operation mode;

[0044] The energy storage coordination controller is further configured to repeatedly execute an off-grid determination operation to perform combined control of the offshore wind turbine;

[0045] Wherein, the off-grid determination operation includes:

[0046] Determine whether an off-grid permission signal is received within a first preset duration after the off-grid request signal is sent;

[0047] If so, control the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system;

[0048] If not, determine whether the energy storage converter in the energy storage system has stopped supplying power to the power grid system. When it is determined that the energy storage converter has stopped supplying power to the power grid system, resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system feeds back the off-grid permission signal again;

[0049] When it is determined that the energy storage converter has not stopped supplying power to the power grid system, control the energy storage converter in the energy storage system to stop supplying power to the power grid system, and resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system feeds back the off-grid permission signal again.

[0050] Preferably, the energy storage coordination controller is further configured to obtain the current second power of the energy storage system after controlling the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system;

[0051] When it is determined that the second power is less than the second preset power threshold, send a first warning signal indicating low power to the offshore wind turbine system, and then determine whether the offshore wind turbine system has completed the wind turbine yaw control operation; wherein, the second preset power threshold is less than the first preset power threshold;

[0052] If so, control the energy storage converter in the energy storage system to enter the shutdown state;

[0053] If not, obtain the current third power of the energy storage system. When it is determined that the third power is less than the third preset power threshold, send a second warning signal indicating that the power cannot meet the wind turbine yaw control operation to the offshore wind turbine system, and control the energy storage converter in the energy storage system to enter the shutdown state after a second preset time period; when it is determined that the third power is not less than the third preset power threshold, re-determine whether the offshore wind turbine system has completed the wind turbine yaw control operation;

[0054] Wherein, the third preset power threshold is less than the second preset power threshold; the second preset time period is less than the first preset time period.

[0055] Based on the above method embodiments, the present invention correspondingly provides an embodiment of a storage medium.

[0056] Another embodiment of the present invention provides a storage medium. The computer-readable storage medium includes a stored computer program. When the computer program runs, it controls the device where the computer-readable storage medium is located to execute the joint control method of energy storage and offshore wind turbines described in the above-mentioned embodiment of the present invention.

[0057] By implementing the present invention, the following beneficial effects are achieved:

[0058] An embodiment of the present invention provides a combined control method, system, and storage medium for energy storage and offshore wind turbines. When it is determined that the power grid system has completed power-off after a typhoon occurs, the present invention can generate an off-grid request signal for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode, and send the off-grid request signal to the offshore wind turbine system to enable the offshore wind turbine system to switch the operation mode and return an off-grid permission signal; by continuously performing off-grid determination operations until it is determined that the off-grid permission signal has been received within the first preset time period, the energy storage converter in the energy storage system is controlled to supply power only to the offshore wind turbine system; specifically, when performing the off-grid determination operation each time, if the off-grid permission signal returned by the offshore wind turbine system has not been received yet, when the energy storage converter has not stopped supplying power to the power grid system, the energy storage converter is directly controlled to stop supplying power to the power grid system, and the off-grid request is continued to be sent; if the energy storage converter has stopped supplying power to the power grid system, the off-grid request signal is continued to be sent to the offshore wind turbine system, so that when it is confirmed that the offshore wind turbine system has switched to the island operation mode, the energy storage converter in the energy storage system can be controlled to supply power only to the offshore wind turbine system, thereby realizing the automatic control of the power supply mode of the energy storage converter. Compared with the prior art, the present invention can automatically control the power supply mode or power supply method of the energy storage converter by monitoring in real time whether the power grid system has completed power-off after a typhoon occurs and whether the offshore wind turbine system has switched to the island operation mode. For example, when it is confirmed that the offshore wind turbine system has switched to the island operation mode, the power supply method of the energy storage converter is controlled to be: supply power only to the offshore wind turbine system; when it is not possible to confirm whether the offshore wind turbine system has switched to the island operation mode, the power supply method of the energy storage converter is directly controlled to be: stop supplying power to the power grid system; therefore, the present invention not only avoids the ineffective utilization of the power of the energy storage system due to manual operation delay or misoperation in the prior art, but also can directly interrupt the energy storage converter from continuing to supply power to the power grid when it is not possible to confirm whether the offshore wind turbine system has switched to the island operation mode, reducing unnecessary power consumption, so that the energy storage can reserve more power to provide sufficient power support for the offshore wind turbine, ensuring the stable operation of the offshore wind turbine system in typhoon weather. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a schematic flowchart of a combined control method for energy storage and offshore wind turbines provided by an embodiment of the present invention.

[0060] Figure 2 is a schematic application structure diagram of a coordination controller of the combined control method provided by an embodiment of the present invention.

[0061] Figure 3 is a schematic flowchart of the power charging process of an energy storage system provided by an embodiment of the present invention.

[0062] Figure 4It is a schematic diagram of the power warning process of the energy storage system provided by an embodiment of the present invention.

[0063] Figure 5 It is a schematic diagram of the grid-connected operation process of the energy storage provided by an embodiment of the present invention.

[0064] Figure 6 It is a schematic diagram of the structure of a combined control system of energy storage and an offshore wind turbine provided by an embodiment of the present invention. Detailed implementation manners

[0065] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0066] As Figure 1 shown, in order to solve the problem in the prior art that due to the inability to effectively control the power supply mode of the energy storage system, the offshore wind turbine system may not be able to operate stably due to insufficient power in typhoon weather, an embodiment of the present invention provides a combined control method for energy storage and an offshore wind turbine, including:

[0067] Step S1: When it is determined that the power grid system has completed power-off after a typhoon occurs, send an off-grid request signal for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode to the offshore wind turbine system, so that the offshore wind turbine system switches the operation mode and returns an off-grid permission signal; wherein, the off-grid permission signal is used to represent the signal that the offshore wind turbine system has completed the switch from the grid-connected power generation mode to the island operation mode;

[0068] Step S2: Repeatedly execute the off-grid determination operation to perform the combined control of the offshore wind turbine.

[0069] The off-grid determination operation includes:

[0070] Judge whether the off-grid permission signal is received within a first preset time period after the off-grid request signal is sent;

[0071] If so, control the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system;

[0072] If not, judge whether the energy storage converter in the energy storage system has stopped supplying power to the power grid system. When it is determined that the energy storage converter has stopped supplying power to the power grid system, re-send the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system re-feeds the off-grid permission signal;

[0073] When it is determined that the energy storage converter has not stopped supplying power to the power grid system, control the energy storage converter in the energy storage system to stop supplying power to the power grid system, and resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system can re-feed the off-grid permission signal.

[0074] For step S1, the combined control of the energy storage and the offshore wind turbine of the present invention can be applied to an energy storage coordination controller, so as to control the power supply between the energy storage and the offshore wind turbine through the energy storage coordination controller. As Figure 2 shown, a connection system architecture diagram of the energy storage power supply, the wind turbine power supply and the external power grid is given, and the energy storage coordination controller in the energy storage system can realize the separate power supply to the offshore wind turbine system and the power grid system.

[0075] In a preferred embodiment, before sending the off-grid request signal for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode to the offshore wind turbine system, the embodiment of the present invention further includes:

[0076] When it is determined that a typhoon warning signal indicating that a typhoon will occur after a third preset time period has been received, determine whether the current fourth power of the energy storage system is not less than a first preset power threshold; wherein, the third preset time period is greater than the first preset time period;

[0077] If not, charge the energy storage system;

[0078] If so, re-determine whether the power grid system has completed power-off after the typhoon occurs.

[0079] Illustratively, in a preferred embodiment, the first preset power threshold is 100%. The third preset time period is 6 hours, and the first preset time period can be 30 seconds. It can be understood that the starting point of the first preset time period is the time when the off-grid request signal is sent.

[0080] As Figure 3 shown in the schematic diagram of the power charging process of the energy storage system, it can be learned that when there is no typhoon: both the energy storage and the wind turbine power generation are grid-connected to the main power grid for operation, and the energy storage coordination controller is controlled by the primary frequency modulation system to participate in power grid frequency modulation; when there is a typhoon warning signal: the energy storage system on the energy storage side can enter the anti-typhoon power supply standby mode in advance, no longer execute the power grid dispatching instruction, first can self-check the battery capacity SOC, so as to charge the battery to ensure that the battery capacity can reach 100%, make the PCS (energy storage converter, Power Convers i on System) standby, and then enter the anti-typhoon mode. Illustratively, the PCS (energy storage converter, PowerConvers i on System) is a key device in the energy storage system, which is used to realize the energy conversion and bidirectional flow between the energy storage battery and the power grid.

[0081] It can be understood that the present invention can track and record the offshore weather, the energy storage system operates normally, and receives superior dispatching control. Once a typhoon warning message is received, it can enter the power backup preparation state according to the predicted landing time of the typhoon. When the energy storage system detects a power grid outage, it will enter the standby mode. After receiving the command from the main controller of the wind turbine to switch the energy storage operation mode from "normal operation" to "typhoon resistance mode", it will operate off-grid and supply power only to the main controller of the wind turbine and the yaw system. It can be understood that the energy storage system is disconnected from the power grid, the power conversion system (PCS) of the energy storage is switched to the off-grid operation mode, and the energy storage coordination controller can also cut off non-essential loads to ensure the power supply to the main controller of the wind turbine and ensure that the wind turbine completes yaw before the typhoon arrives.

[0082] Schematically, the end point of the third preset time period is the predicted landing time of the typhoon included in the typhoon warning signal. When the third preset time period is 6 hours, the energy storage system can be controlled to enter the power backup preparation state 6 hours in advance. And the energy storage system entering the power backup preparation state means that the energy storage system enters the process of judging the battery level. When the battery level is less than 100%, it enters the charging state, so as to ensure that the energy storage system has sufficient power to meet the power demand during the typhoon.

[0083] Specifically, when the energy storage coordination controller determines that the power grid system has been powered off after the typhoon occurs, it judges whether the power grid is powered off, and meets the conditions for off-grid operation after the power outage;

[0084] After the energy storage coordination controller checks that the conditions for off-grid operation are met, it cuts off non-essential loads and sends an off-grid request signal to the main controller of the wind turbine system of the offshore wind turbine, and then waits for the main controller of the wind turbine to reply and confirm. It can be understood that the present invention can actively send an off-grid request signal after detecting a power grid outage (i.e., after a typhoon occurs), rather than relying on passive response, which can shorten the switching delay. By requesting the offshore wind turbine to switch from the grid-connected power generation mode to the island operation mode, the state of the offshore wind turbine system can be quickly and accurately judged to effectively control the energy storage system to provide power support for the offshore wind turbine system.

[0085] For step S2, an embodiment of the present invention is: waiting for the offshore wind turbine system to return an off-grid permission signal, and within the first preset time period, if the off-grid permission signal is not received, it is further judged whether the power conversion system of the energy storage system in the energy storage system has stopped supplying power to the power grid. If it has not stopped, control the power conversion system to stop supplying power and send the off-grid request signal again to reduce unnecessary power consumption; if it has stopped, continue to send the off-grid request signal. Once the off-grid permission signal is received, control the power conversion system to supply power only to the offshore wind turbine system to ensure that the energy storage system can provide sufficient power to the main controller of the wind turbine to complete yaw under the condition of a power grid outage, and ensure the safety of the wind power generation facility.

[0086] Schematically, the first preset time period can be 30 seconds. If the communication between the energy storage system and the main control of the wind turbine is interrupted for 30 seconds, that is, the off-grid permission signal has not been received within 30 seconds, then the energy storage converter is controlled to stop, so that the battery of the energy storage system stops supplying power to the power grid system, and continuously sends the off-grid permission signal to the main control of the wind turbine; after waiting for the main control of the wind turbine to reply and confirm, then start the PCS (energy storage converter) to supply power only to the wind turbine unit. It can be understood that when controlling the energy storage converter in the energy storage system to stop supplying power to the power grid system, it can continue to supply power to the offshore wind turbine system, or directly stop the operation of the energy storage converter, so as to save the power of the energy storage battery until it is determined that the off-grid permission signal has been received within the first preset time period, and then control the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system.

[0087] Schematically, when the power grid is powered off, the offshore wind turbine needs to quickly switch to the island operation mode to ensure its own safety. And the present invention controls the energy storage converter to supply power only to the offshore wind turbine system, which can ensure that the wind turbine has sufficient power support to complete key operations such as yaw during the power outage, and avoid damage to the wind turbine due to loss of power. Moreover, under extreme weather conditions such as typhoons, the power grid system is often easily damaged. By controlling the energy storage converter to provide independent power support for the offshore wind turbine system, the reliability of the wind turbine system can also be enhanced, ensuring that the wind turbine can still operate normally in harsh environments.

[0088] Furthermore, the embodiment of the present invention can also send the off-grid operation mode signal of the wind turbine system to the main control side; it can be understood that after the main control side of the offshore wind turbine system receives that the energy storage converter has disconnected from the power grid and supplies power only to the wind turbine system, it will start the wind turbine yaw operation.

[0089] In a preferred embodiment, after the embodiment of the present invention controls the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system, it further includes:

[0090] Obtain the current second power of the energy storage system;

[0091] When it is determined that the second power is less than the second preset power threshold, then send a first warning signal indicating low power to the offshore wind turbine system, and then judge whether the offshore wind turbine system has completed the wind turbine yaw control operation; wherein, the second preset power threshold is less than the first preset power threshold;

[0092] If so, control the energy storage converter in the energy storage system to enter the shutdown state;

[0093] If not, obtain the current third power level of the energy storage system. When it is determined that the third power level is less than the third preset power threshold, send a second warning signal indicating that the power cannot meet the yaw control operation of the wind turbine to the offshore wind turbine system, and control the energy storage converter in the energy storage system to enter the shutdown state after a second preset time period; when it is determined that the third power level is not less than the third preset power threshold, re-determine whether the offshore wind turbine system has completed the yaw control operation of the wind turbine.

[0094] Among them, the third preset power threshold is less than the second preset power threshold; the second preset time period is less than the first preset time period.

[0095] Schematically, the second preset power threshold can be 15%, the third preset power threshold can be 10%, and the second preset time period is 10 seconds.

[0096] Specifically, after the energy storage converter starts to supply power to the offshore wind turbine system, the present invention can first obtain the current power level (i.e., the second power level) of the energy storage system to evaluate whether the remaining power is sufficient.

[0097] Judge whether the second power level is less than the second preset power threshold. If the second power level is less than the preset second power threshold (such as 15%), it indicates that the power level of the energy storage system is already low and warning measures need to be taken. Then send a first warning signal and judge whether the yaw control operation of the wind turbine is completed. Schematically, yaw control is a key protection measure for wind turbines in extreme weather such as typhoons to ensure that the wind turbines can be safely aligned with the wind direction. For example, rotate the direction of the wind turbine blades to the same direction as the wind direction (when there is no typhoon, the direction of the wind turbine blades is perpendicular to the direction of the wind to obtain the maximum wind power for power generation). After yaw, the blowing force of the typhoon on the wind turbine blades is the smallest, which can avoid the collapse or damage of the wind turbine tower. The power required for the yaw of the wind turbine is provided by the energy storage, so the coordination controller needs to ensure that the energy storage has enough power to ensure that the wind turbine completes yaw.

[0098] If the wind turbine has completed the yaw control operation, control the energy storage converter in the energy storage system to enter the shutdown state to save the remaining power. If the wind turbine has not completed the yaw control operation, continue to obtain the current third power level of the energy storage system and judge whether it is less than the third preset power threshold (such as 10%).

[0099] If the third power level is less than the third preset power threshold, indicating that the power is extremely insufficient, a second warning signal can be sent to the offshore wind turbine system, and the energy storage converter can be controlled to enter the shutdown state after a second preset time period (such as 10 seconds). If the third power level is not less than the third preset power threshold, re-determine whether the offshore wind turbine system has completed the yaw control operation of the wind turbine, forming a loop detection mechanism.

[0100] Therefore, by setting different power thresholds (the second preset power threshold and the third preset power threshold) in the embodiments of the present invention, a warning signal can be sent in advance when the power is insufficient, avoiding the loss of power support for the wind turbine due to the exhaustion of the energy storage system power.

[0101] When the power is insufficient and the wind turbine has not completed the yaw control operation, the coordination controller of the present invention saves the remaining power by controlling the energy storage converter to shut down. It can be understood that the coordination controller needs to ensure that the energy storage system has a specific minimum amount of power, otherwise the energy storage system cannot be self-started or remotely started after being emptied; if the wind turbine has not completed the yaw when the energy storage power is too low, it means that the operating mechanism of the wind turbine is faulty and cannot continue to perform the yaw task. Then, in order to protect the energy storage converter of the energy storage system from being undercharged, the present invention can order the energy storage converter to shut down, so that the energy storage converter can be remotely started after the power grid is restored to continue to assist in the control of the wind turbine, thereby avoiding the need for manual island entry to manually start the device when the wind turbine resumes power generation, not only reducing the maintenance time cost and labor cost, but also improving the recovery speed of wind power generation.

[0102] Through the loop detection mechanism and the monitoring of the wind turbine yaw control operation, the present invention can flexibly adjust the operating state of the energy storage converter according to the actual situation, ensuring the effective utilization of power, avoiding unnecessary power waste, and effectively improving the response ability and stability of the offshore wind power system under extreme weather conditions.

[0103] In a preferred embodiment, as Figure 4 shown in the schematic diagram of the power alarm process, the state of charge (SOC) of the battery of the energy storage system can be continuously obtained. If the SOC is lower than the warning limit value (such as 15%), the energy storage coordination controller can send a low SOC warning signal to the main control of the wind turbine and judge whether the yaw of the main control side of the wind turbine is completed.

[0104] If the wind turbine yaw is not completed at this time, it is judged whether the SOC of the battery of the energy storage system is lower than the protection limit value (such as 10%). If it is lower, the energy storage coordination controller is commanded to send a low SOC protection signal to the main control of the wind turbine. Schematically, after receiving this protection signal, the main control side of the wind turbine will stop the yaw of the wind turbine and, after a delay of 10 seconds, send an instruction to shut down the power conversion system (PCS) of the energy storage, thereby retaining the power required for subsequent remote start of the energy storage converter and avoiding manual island entry for operation. If the wind turbine yaw has been completed at this time, an instruction can be directly sent to the PCS of the energy storage coordination controller to shut down.

[0105] Therefore, through a reasonable power management and warning mechanism, the embodiments of the present invention ensure that the offshore wind turbine can safely shut down when the power is insufficient and can be quickly restarted after the power is restored, thus guaranteeing the continuous operation and power generation efficiency of the offshore wind turbine.

[0106] In a preferred embodiment, when it is determined that a yaw completion signal sent by the offshore wind turbine system has been received, the energy storage converter in the energy storage system is controlled to enter a shutdown state;

[0107] The yaw completion signal is used to indicate that the offshore wind turbine system has completed the wind turbine yaw control operation.

[0108] It is understandable that after the wind turbine master controller completes the yaw control, it can send a yaw completion signal to the coordination controller, so that the coordination controller can issue an instruction to shut down the energy storage inverter PCS to preserve more battery power in the energy storage system and safely pass the typhoon period.

[0109] In a preferred embodiment, after controlling the energy storage converter in the energy storage system to only supply power to the offshore wind turbine system, the present invention further includes:

[0110] Sending a heartbeat packet to the offshore wind turbine system according to a preset time interval to verify whether a communication link between the energy storage system and the offshore wind turbine system exists;

[0111] When it is determined that no heartbeat response returned by the offshore wind turbine system is received within the first preset time period, the energy storage converter in the energy storage system is controlled to enter a shutdown state after a second preset time period;

[0112] When it is determined that a heartbeat response returned by the offshore wind turbine system has been received within the first preset time period, the heartbeat packet is resent to the offshore wind turbine system according to the preset time interval.

[0113] Illustratively, the embodiment of the present invention sends the heartbeat packet to the offshore wind turbine system to determine whether the energy storage system has lost communication with the offshore wind turbine system. Since the control strategy of the wind turbine master control is the responsibility of the wind turbine master control and cannot be controlled by the energy storage coordination controller, the responsibility of the coordination controller is to maintain sufficient power to support the adjustment of the wind turbine. If the communication with the wind turbine master control is interrupted for 30 seconds, it means that the wind turbine master control is faulty or shut down. At this time, the power supply task of the energy storage has been completed. In order to save power, the energy storage converter PCS can be ordered to shut down.

[0114] In a preferred embodiment, after controlling the energy storage converter in the energy storage system to only supply power to the offshore wind turbine system, the present invention further includes:

[0115] determining whether a typhoon disappearance signal indicating that the typhoon has disappeared is received;

[0116] If so, when it is determined that a grid-connected operation request signal sent by the power grid system has been received, the energy storage converter in the energy storage system is controlled to supply power to the power grid system; wherein the grid-connected operation request signal is used to represent a signal that the power grid system requests the energy storage system to supply power to the power grid system;

[0117] If not, re-determine whether the typhoon disappearance signal is received.

[0118] Illustratively, when it is confirmed that the typhoon has disappeared and the grid connection operation request signal sent by the power grid system is received, the energy storage converter can be controlled to supply power to the power grid system, so that the normal operation of the power grid can be quickly restored after the typhoon, and the stability of power supply can be ensured.

[0119] As Figure 5 As can be seen from the schematic diagram of the energy storage grid connection operation process shown, when the typhoon disappears and the energy storage system is in normal operation without failure, the coordination controller waits for the main control side to issue an instruction allowing grid connection. After the coordination controller receives the signal allowing grid connection sent by the main control, and checks that the energy storage system meets the grid connection operation conditions, the energy storage converter can be switched to the grid connection mode, so that the energy storage system automatically connects to the grid in the grid connection mode and sends the grid connection signal to the main control side.

[0120] In a preferred embodiment, when the typhoon disappears, if the energy storage system is in a fault shutdown state (such as energy storage PCS fault, energy storage BMS fault, etc.), the distribution switch on the energy storage side can be disconnected, and the coordination controller can send a fault status signal to the main control side to inform it that a fault has occurred and the energy storage converter cannot be switched to the grid connection mode temporarily.

[0121] In a preferred embodiment, the embodiment of the present invention can also send the off-grid operation mode signal of the fan system and the off-grid operation mode signal of the energy storage system to the power grid main control side to further determine whether the signal that the power grid has resumed operation is received. If the power grid has resumed operation, the anti-typhoon mode of the energy storage system is ended and switched to the normal operation mode, so that the energy storage system automatically connects to the grid in the grid connection mode. If the power grid has not resumed operation, the battery power of the energy storage system can be continuously monitored.

[0122] It can be understood that since the typhoon operation path will change and the power grid power outage is a decision made based on meteorological forecasts and warnings, if the typhoon path changes and the typhoon warning is lifted, then the power grid dispatching will control the operation to restore the power grid. At this point, the anti-typhoon mode should be ended, so that the energy storage system automatically connects to the grid in the grid connection mode, thereby receiving the primary frequency modulation control of the power grid.

[0123] As Figure 6 As shown, based on the above embodiments of various joint control methods for energy storage and offshore wind turbines, the present invention correspondingly provides system embodiments;

[0124] An embodiment of the present invention provides a joint control system for energy storage and offshore wind turbines, including: an energy storage coordination controller, an offshore wind turbine system, and a power grid system;

[0125] The power grid system is used to generate a power grid power-off signal and send the power grid power-off signal to the energy storage coordination controller; wherein, the power grid power-off signal is a signal used to indicate that a typhoon has occurred and the power grid system has completed power-off.

[0126] The energy storage coordination controller is used to send an off-grid request signal for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode to the offshore wind turbine system after receiving the power grid power-off signal.

[0127] The offshore wind turbine system is used to switch the operation mode of the offshore wind turbine system to the island operation mode after receiving the off-grid request signal, and then return an off-grid permission signal; wherein, the off-grid permission signal is a signal used to indicate that the offshore wind turbine system has completed the switch from the grid-connected power generation mode to the island operation mode.

[0128] The energy storage coordination controller is further used to repeatedly execute the off-grid determination operation for the joint control of the offshore wind turbines.

[0129] Wherein, the off-grid determination operation includes:

[0130] Judge whether the off-grid permission signal is received within the first preset duration after the off-grid request signal is sent.

[0131] If so, control the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system.

[0132] If not, judge whether the energy storage converter in the energy storage system has stopped supplying power to the power grid system. When it is determined that the energy storage converter has stopped supplying power to the power grid system, resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system re-feeds the off-grid permission signal.

[0133] When it is determined that the energy storage converter has not stopped supplying power to the power grid system, control the energy storage converter in the energy storage system to stop supplying power to the power grid system and resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system re-feeds the off-grid permission signal.

[0134] In a preferred embodiment, the energy storage coordination controller is further used to obtain the current second power level of the energy storage system after controlling the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system.

[0135] When it is determined that the second power level is less than the second preset power level threshold, send a first warning signal indicating low power to the offshore wind turbine system, and then judge whether the offshore wind turbine system has completed the wind turbine yaw control operation; wherein, the second preset power level threshold is less than the first preset power level threshold.

[0136] If so, control the energy storage converter in the energy storage system to enter the shutdown state.

[0137] If not, obtain the current third power level of the energy storage system. When it is determined that the third power level is less than the third preset power threshold, send a second warning signal indicating that the power is insufficient to meet the yaw control operation of the wind turbine to the offshore wind turbine system, and control the energy storage converter in the energy storage system to enter the shutdown state after a second preset time period; when it is determined that the third power level is not less than the third preset power threshold, re-determine whether the offshore wind turbine system has completed the yaw control operation of the wind turbine.

[0138] Wherein, the third preset power threshold is less than the second preset power threshold; the second preset time period is less than the first preset time period.

[0139] Illustratively, when the power grid system detects that a typhoon has occurred and power has been cut off, it will generate a power grid power cut-off signal and send it to the energy storage coordination controller, ensuring that the energy storage coordination controller can quickly respond to the typhoon situation.

[0140] After receiving the power grid power cut-off signal, the energy storage coordination controller will send an off-grid request signal to the offshore wind turbine system, requesting it to switch from the grid-connected power generation mode to the island operation mode to protect the offshore wind turbine system from the influence of grid instability during the typhoon and ensure its safe operation.

[0141] After the offshore wind turbine system switches to the island operation mode, the energy storage coordination controller will control the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system, ensuring that the offshore wind turbine system has sufficient power support during the typhoon and also improving the utilization rate of the energy storage system.

[0142] The energy storage coordination controller ensures the successful switching of the offshore wind turbine system to the island operation mode by repeatedly performing the off-grid determination operation. If the off-grid permission signal is not received within the first preset time period, the energy storage coordination controller will check whether the energy storage converter has stopped supplying power to the power grid system and re-send the off-grid request signal according to the situation.

[0143] Then, the combined control system of energy storage and offshore wind turbines of the present invention improves the flexibility and adaptability of the system through automatic control and intelligent determination. Even under extreme weather conditions such as typhoons, the system can automatically complete operations such as signal transmission, mode switching, and power supply control without manual intervention, not only reducing the operation risk, but also improving the safety and reliability of the system.

[0144] It should be noted that the system embodiments described above are merely illustrative. Each device described as a separate component may or may not be physically separated, and the components shown as devices may or may not be physical modules. They may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the system embodiments provided by the present invention, the connection relationships between devices indicate that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement this without creative efforts.

[0145] Those skilled in the art can clearly understand that for the sake of convenience and brevity, the specific working process of the system described above can refer to the corresponding process in the foregoing method embodiments and will not be elaborated here.

[0146] Based on the above embodiments of the various joint control methods of energy storage and offshore wind turbines, the present invention correspondingly provides embodiments of storage media.

[0147] An embodiment of the present invention provides a storage medium, which includes a stored computer program. When the computer program runs, it controls the device where the computer-readable storage medium is located to execute a joint control method of energy storage and offshore wind turbines according to any one of the method embodiments of the present invention.

[0148] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by a processor, the steps of the above various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or system, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0149] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A combined control method of energy storage and offshore wind turbines, characterized in that: include: When it is determined that the power grid system has completed power outage after the typhoon occurs, an off-grid request signal for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode is sent to the offshore wind turbine system, so that the offshore wind turbine system switches the operation mode and returns an off-grid permission signal; wherein the off-grid permission signal is a signal for indicating that the offshore wind turbine system has completed switching from the grid-connected power generation mode to the island operation mode; Repeat the off-grid determination operation to conduct joint control of offshore wind turbines; The off-grid determination operation includes: Determining whether an off-network permission signal is received within a first preset time period after the off-network request signal is sent; If so, the energy storage converter in the energy storage system is controlled to only supply power to the offshore wind turbine system; If not, determine whether the energy storage converter in the energy storage system has stopped supplying power to the power grid system. When it is determined that the energy storage converter has stopped supplying power to the power grid system, resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system re-feeds back the off-grid permission signal. When it is determined that the energy storage converter has not stopped supplying power to the grid system, the energy storage converter in the energy storage system is controlled to stop supplying power to the grid system, and an off-grid request signal is resent to the offshore wind turbine system, so that the offshore wind turbine system re-feeds back an off-grid permission signal.

2. A combined control method of energy storage and offshore wind turbines according to claim 1, characterized in that: Also includes: When it is determined that the power grid system has not completed the power outage after the typhoon occurs, determining whether the current first power of the energy storage system is not less than a first preset power threshold; If not, the energy storage system is charged; If so, re-determine whether the power grid system has completed power outage after the typhoon occurs.

3. A combined control method of energy storage and offshore wind turbines as claimed in claim 2, characterized in that: After controlling the energy storage converter in the energy storage system to only supply power to the offshore wind turbine system, it also includes: Obtain the current second power of the energy storage system; When it is determined that the second power level is less than a second preset power level threshold, a first warning signal for indicating low power level is sent to the offshore wind turbine system, and then it is determined whether the offshore wind turbine system has completed the wind turbine yaw control operation; wherein the second preset power level threshold is less than the first preset power level threshold; If yes, the energy storage converter in the energy storage system is controlled to enter a shutdown state; If not, the third current power of the energy storage system is obtained. When it is determined that the third power is less than the third preset power threshold, a second warning signal is sent to the offshore wind turbine system to indicate that the power cannot meet the wind turbine yaw control operation, and the energy storage converter in the energy storage system is controlled to enter a shutdown state after a second preset time period; when it is determined that the third power is not less than the third preset power threshold, it is re-determined whether the offshore wind turbine system has completed the wind turbine yaw control operation; Among them, the third preset power threshold is smaller than the second preset power threshold; the second preset time period is smaller than the first preset time period.

4. A combined control method of energy storage and offshore wind turbines as claimed in claim 3, characterized in that: After controlling the energy storage converter in the energy storage system to only supply power to the offshore wind turbine system, it also includes: Sending a heartbeat packet to the offshore wind turbine system according to a preset time interval to verify whether a communication link between the energy storage system and the offshore wind turbine system exists; When it is determined that no heartbeat response returned by the offshore wind turbine system is received within the first preset time period, the energy storage converter in the energy storage system is controlled to enter a shutdown state after a second preset time period; When it is determined that a heartbeat response returned by the offshore wind turbine system has been received within the first preset time period, the heartbeat packet is resent to the offshore wind turbine system according to the preset time interval.

5. A combined control method of energy storage and offshore wind turbines as claimed in claim 4, characterized in that: After controlling the energy storage converter in the energy storage system to only supply power to the offshore wind turbine system, it also includes: When it is determined that a yaw completion signal sent by the offshore wind turbine system has been received, the energy storage converter in the energy storage system is controlled to enter a shutdown state; The yaw completion signal is used to indicate that the offshore wind turbine system has completed the wind turbine yaw control operation.

6. A combined control method of energy storage and offshore wind turbines as claimed in claim 5, characterized in that: After controlling the energy storage converter in the energy storage system to only supply power to the offshore wind turbine system, it also includes: determining whether a typhoon disappearance signal indicating that the typhoon has disappeared is received; If so, when it is determined that a grid-connected operation request signal sent by the power grid system has been received, the energy storage converter in the energy storage system is controlled to supply power to the power grid system; wherein the grid-connected operation request signal is used to represent a signal that the power grid system requests the energy storage system to supply power to the power grid system; If not, re-judge whether the typhoon disappearance signal is received.

7. A combined control method of energy storage and offshore wind turbines as claimed in claim 6, characterized in that: Before sending an off-grid request signal for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode to the offshore wind turbine system, the method further includes: When it is determined that a typhoon warning signal indicating that a typhoon will occur after a third preset time period has been received, determining whether a fourth current power level of the energy storage system is not less than a first preset power level threshold; wherein the third preset time period is greater than the first preset time period; If not, the energy storage system is charged; If so, re-determine whether the power grid system has completed power outage after the typhoon occurs.

8. A combined control system of energy storage and offshore wind turbines, characterized in that: include: Energy storage coordination controller, offshore wind turbine system and power grid system; The power grid system is used to generate a power grid power-off signal and send the power grid power-off signal to the energy storage coordination controller; wherein the power grid power-off signal is used to indicate that a typhoon has occurred and the power grid system has completed power outage; The energy storage coordination controller is used to send an off-grid request signal to the offshore wind turbine system for requesting the offshore wind turbine system to switch from the grid-connected power generation mode to the island operation mode after receiving the grid power failure signal; The offshore wind turbine system is used to switch the operation mode of the offshore wind turbine system to the island operation mode after receiving the off-grid request signal, and then return the off-grid permission signal; wherein the off-grid permission signal is a signal used to indicate that the offshore wind turbine system has completed the switch from the grid-connected power generation mode to the island operation mode; The energy storage coordination controller is also used to repeatedly execute the off-grid determination operation to perform joint control of the offshore wind turbines; The off-grid determination operation includes: Determining whether an off-network permission signal is received within a first preset time period after the off-network request signal is sent; If so, the energy storage converter in the energy storage system is controlled to only supply power to the offshore wind turbine system; If not, determine whether the energy storage converter in the energy storage system has stopped supplying power to the power grid system. When it is determined that the energy storage converter has stopped supplying power to the power grid system, resend the off-grid request signal to the offshore wind turbine system so that the offshore wind turbine system re-feeds back the off-grid permission signal. When it is determined that the energy storage converter has not stopped supplying power to the grid system, the energy storage converter in the energy storage system is controlled to stop supplying power to the grid system, and an off-grid request signal is resent to the offshore wind turbine system, so that the offshore wind turbine system re-feeds back an off-grid permission signal.

9. A combined control system of energy storage and offshore wind turbines as claimed in claim 8, characterized in that: The energy storage coordination controller is further used to obtain a second current amount of electricity of the energy storage system after controlling the energy storage converter in the energy storage system to supply power only to the offshore wind turbine system; When it is determined that the second power level is less than a second preset power level threshold, a first warning signal for indicating low power level is sent to the offshore wind turbine system, and then it is determined whether the offshore wind turbine system has completed the wind turbine yaw control operation; wherein the second preset power level threshold is less than the first preset power level threshold; If yes, the energy storage converter in the energy storage system is controlled to enter a shutdown state; If not, the third current power of the energy storage system is obtained. When it is determined that the third power is less than the third preset power threshold, a second warning signal is sent to the offshore wind turbine system to indicate that the power cannot meet the wind turbine yaw control operation, and the energy storage converter in the energy storage system is controlled to enter a shutdown state after a second preset time period; when it is determined that the third power is not less than the third preset power threshold, it is re-determined whether the offshore wind turbine system has completed the wind turbine yaw control operation; Among them, the third preset power threshold is smaller than the second preset power threshold; the second preset time period is smaller than the first preset time period.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute a combined control method of energy storage and offshore wind turbines as described in any one of claims 1 to 7.

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