Fan variable pitch system backup power charge and discharge control device, system and method

Abstract

The application relates to a wind turbine variable pitch system backup power charge-discharge control device, system and method, the device comprising a first switch module, a second switch module, a voltage monitoring module, a logic control module and a discharge module; the first switch module is arranged between a wind turbine system and a backup power; the second switch module is arranged between the backup power and the discharge module; the discharge module is used for releasing the electric quantity in the backup power; the detection end of the voltage monitoring module is connected with the backup power, the output end is connected with the logic control module, the voltage monitoring module is used for monitoring the backup power in real time and outputting a voltage monitoring value to the logic control module; the logic control module is in communication connection with an external system, is used for receiving a wind turbine state signal and a charge-discharge control signal, and controls the on-off of the first switch module and the second switch module according to the wind turbine state signal, the charge-discharge control signal and the voltage monitoring value, so as to realize the charging or discharging of the backup power.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation control, in particular to a wind turbine variable pitch system backup power charge and discharge control device, system and method. BACKGROUND

[0002] The working principle of the wind turbine variable pitch system is to adjust the power output and operating state of the wind turbine by changing the pitch angle of the blades. The current electric variable pitch system mainly includes a variable pitch controller, a servo driver and a backup power system. Each blade is provided with an independent actuator, and the servo motor is connected to the inner ring gear of the blade wheel through a reduction box and a driving gear, directly controlling the angle of each blade to adapt to different wind speeds and load conditions. In the event of a power failure, the backup power system can quickly adjust the blades to the feathering position to ensure the safe shutdown of the wind turbine.

[0003] According to the "Wind Turbine Generator System Operation and Maintenance Requirements" and the operation requirements of wind turbine manufacturers, in order to ensure the health status of the variable pitch backup power, the battery or super capacitor of the variable pitch backup power needs to be periodically charged and discharged. However, the current variable pitch backup power of the wind turbine does not have remote discharge capability, therefore, the maintenance personnel need to climb to the top of the tower of the wind turbine to disconnect the main power switch of the variable pitch system, and the backup power automatically connects the discharge of the variable pitch system to meet the maintenance requirements of the backup power. SUMMARY

[0004] The embodiments of the present application provide a wind turbine variable pitch system backup power charge and discharge control device, system and method to at least solve the problem that the variable pitch backup power of the wind turbine in the related art cannot realize remote discharge and requires the staff to perform discharge operation on site.

[0005] In a first aspect, the embodiments of the present application provide a wind turbine variable pitch backup power charge and discharge control device, which is applied in an electric variable pitch system, and includes a first switch module, a second switch module, a voltage monitoring module, a logic control module and a discharge module; wherein,

[0006] The first switch module is arranged between the wind turbine system and the backup power, and the second switch module is arranged between the backup power and the discharge module; the discharge module is used to release the electric quantity in the backup power;

[0007] The detection end of the voltage monitoring module is connected with the backup power, and the output end is connected with the logic control module; the voltage monitoring module is used to monitor the backup power in real time and output a voltage monitoring value to the logic control module;

[0008] The logic control module is in communication connection with an external system, for receiving a fan state signal and a charge-discharge control signal, and controlling the on-off of the first and second switch modules according to the fan state signal, the charge-discharge control signal and a voltage monitoring value, so as to realize the charging or discharging of the backup power supply.

[0009] In an embodiment, the fan state signal comprises a fan shutdown signal and a fan running signal; the charge-discharge control signal comprises a charging control signal and a discharging control signal; wherein,

[0010] The controlling of the on-off of the first and second switch modules according to the fan state signal, the charge-discharge control signal and the voltage monitoring value, so as to realize the charging or discharging of the backup power supply, comprises:

[0011] If the logic control module receives the fan running signal, the first and second switch modules are controlled to be closed;

[0012] If the logic control module receives the fan shutdown signal and the discharging control signal, the first switch module is controlled to be opened and the second switch module is controlled to be closed;

[0013] If the logic control module detects that the voltage monitoring value is less than a first voltage threshold value and receives the charging control signal, the first switch module is controlled to be closed and the second switch module is controlled to be opened;

[0014] When the backup power supply is discharging, if the logic control module does not receive the fan shutdown signal, the first switch module is controlled to be closed and the second switch module is controlled to be opened.

[0015] In an embodiment, the logic control module is in communication connection with a remote control platform; wherein the obtaining of the charge-discharge control signal comprises:

[0016] The logic control module sends the fan state signal and the voltage monitoring value to the remote control platform;

[0017] When the fan state signal indicates that the wind turbine is in a running state and the voltage monitoring value is within a preset range, the logic control module or the remote control platform outputs the charging control signal and the discharging control signal;

[0018] When the fan state signal indicates that the wind turbine is in a shutdown state and the voltage monitoring value is within a preset range, the logic control module or the remote control platform outputs the discharging control signal;

[0019] When the voltage monitoring value is less than a first voltage threshold value, the logic control module or the remote control platform outputs the charging control signal.

[0020] In an embodiment, the logic control module receives the first switch state signal generated by the first switch module and the second switch state signal generated by the second switch module and inputs the remote control platform, so that the remote control platform presents the on-off state of the first switch module and the second switch module to the user.

[0021] In an embodiment, the logic control module is a programmable logic controller.

[0022] In an embodiment, the discharge module is a discharge resistor cabinet.

[0023] In an embodiment, the voltage monitoring module uses a voltage monitor.

[0024] In a second aspect, the embodiments of the present application provide a wind turbine variable pitch system, comprising a backup power supply and the wind turbine variable pitch backup power supply charging and discharging control device in any one of the above embodiments, and the charging and discharging of the backup power supply is controlled through the backup power supply charging and discharging control device.

[0025] In a third aspect, the embodiments of the present application provide a wind turbine variable pitch backup power supply charging and discharging control method, which is applied to the wind turbine variable pitch backup power supply charging and discharging control device in any one of the above embodiments; the method comprises:

[0026] obtaining a wind turbine state signal and a voltage monitoring value, and generating a charging and discharging control signal according to the wind turbine state signal and the voltage monitoring value;

[0027] and controlling the on-off of the first switch module and the second switch module according to the wind turbine state signal, the charging and discharging control signal and the voltage monitoring value, so as to realize the charging or discharging of the backup power supply; the wind turbine state signal includes a wind turbine shutdown signal and a wind turbine running signal; the charging and discharging control signal includes a charging control signal and a discharging control signal;

[0028] If the logic control module receives the wind turbine running signal and the discharging control signal, the first switch module and the second switch module are controlled to be closed; if the logic control module receives the wind turbine shutdown signal and the discharging control signal, the first switch module is controlled to be open and the second switch module is controlled to be closed; if the logic control module detects that the voltage monitoring value is less than a first voltage threshold value and receives the charging control signal, the first switch module is controlled to be closed and the second switch module is controlled to be open; when the backup power supply is discharging, if the logic control module does not receive the wind turbine shutdown signal, the first switch module is controlled to be closed and the second switch module is controlled to be open.

[0029] In an embodiment, the generation of the charging and discharging control signal according to the wind turbine state signal and the voltage monitoring value comprises:

[0030] output the charging control signal and the discharging control signal when the fan state signal indicates that the wind turbine is in the running state and the voltage monitoring value is in the preset range;

[0031] output the discharging control signal when the fan state signal indicates that the wind turbine is in the shutdown state and the voltage monitoring value is in the preset range;

[0032] output the charging control signal when the voltage monitoring value is less than the first voltage threshold.

[0033] The wind turbine variable pitch system backup power charging and discharging control device, system and method provided by the embodiment of the application have at least the following technical effects:

[0034] The application adds a backup power monitoring voltage, so that the monitoring condition of the backup power can be monitored during the operation of the wind turbine. The backup power discharging function is remotely controlled, so as to avoid the operation and maintenance personnel from climbing to the top tower drum of the wind turbine and reduce the operation and maintenance cost. The backup power discharging function is added after the wind turbine operation is locked, so as to avoid personnel misoperation and ensure the reliable input of the backup power when the variable pitch main power fails.

[0035] The details of one or more embodiments of the application are presented in the following drawings and description to make other features, objects and advantages of the application more clear and easy to understand. BRIEF DESCRIPTION OF DRAWINGS

[0036] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The illustrative embodiments of the application and their descriptions are used to explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0037] Figure 1 is a structural block diagram of the wind turbine variable pitch system backup power charging and discharging control device in an embodiment of the application;

[0038] Figure 2 is a structural block diagram of the wind turbine variable pitch system backup power charging and discharging control device in another embodiment of the application. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the application more clear and understandable, the application is described and explained below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and do not limit the application. Based on the embodiments provided by the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the application.

[0040] It is apparent that the drawings in the following description merely show some examples or embodiments of the present application, and for those skilled in the art, the present application can be applied to other similar situations without creative efforts based on these drawings. In addition, it can be understood that although the efforts made in this development process can be complex and lengthy, some design, manufacture or production changes based on the technical content disclosed in the present application are only routine technical means for those skilled in the art related to the disclosure of the present application, and should not be understood as insufficient disclosure of the present application.

[0041] In the present application, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments without conflict.

[0042] Unless otherwise defined, the technical terms or scientific terms involved in the present application should be understood as the usual meaning understood by those skilled in the art in the technical field to which the present application belongs. The terms "one", "a", "an", "the" and the like similar words involved in the present application do not represent quantity limitation, but can represent singular or plural. The terms "include", "contain", "have" and any variations thereof involved in the present application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or units, but can also include steps or units not listed, or can also include other steps or units inherent to the process, method, product or device. The terms "connected", "connected", "coupled" and the like similar words involved in the present application are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. The term "multiple" in the present application means two or more. The association between the associated objects is described by the term "and / or", which means that there can be three relationships, for example, "A and / or B" can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship. The terms "first", "second", "third" and the like involved in the present application are only to distinguish similar objects, and do not represent a specific order for the objects.

[0043] The wind turbine variable pitch system backup power charge and discharge control device provided by the embodiment of the present application is applied in an electric variable pitch system and includes a first switch module, a second switch module, a voltage monitoring module, a logic control module and a discharge module.

[0044] Reference Figure 1 The first switch module is arranged between the wind turbine system and the backup power supply, and the second switch module is arranged between the backup power supply and the discharging module; the discharging module is used for discharging the electric quantity in the backup power supply; the detection end of the voltage monitoring module is connected with the backup power supply, and the output end is connected with the logic control module; the voltage monitoring module is used for monitoring the backup power supply in real time and outputting a voltage monitoring value to the logic control module; the logic control module is in communication connection with an external system, is used for receiving a wind turbine state signal and a charging and discharging control signal, and controls the on-off of the first switch module and the second switch module according to the wind turbine state signal, the charging and discharging control signal and the voltage monitoring value, so as to realize the charging or discharging of the backup power supply.

[0045] In the embodiment, the logic control module is a programmable logic controller or a microcontroller, the discharging module is a discharging resistor cabinet, and the voltage monitoring module adopts a voltage monitor.

[0046] Specifically, the wind turbine state signal includes a wind turbine shutdown signal and a wind turbine running signal; and the charging and discharging control signal includes a charging control signal and a discharging control signal. The first switch module and the second switch module are controlled according to the wind turbine state signal, the charging and discharging control signal and the voltage monitoring value, so as to realize the charging or discharging of the backup power supply. In the control process, if the logic control module receives the wind turbine running signal and the discharging control signal, the first switch module and the second switch module are controlled to be closed; if the logic control module receives the wind turbine shutdown signal and the discharging control signal, the first switch module is controlled to be opened and the second switch module is controlled to be closed; if the logic control module detects that the voltage monitoring value is less than a first voltage threshold value and receives the charging control signal, the first switch module is controlled to be closed and the second switch module is controlled to be opened; and when the backup power supply is discharging, if the logic control module does not receive the wind turbine shutdown signal, the first switch module is controlled to be closed and the second switch module is controlled to be opened.

[0047] In another preferred embodiment, the control of the charging and discharging of the backup power supply needs to meet multiple conditions to avoid misoperation. Specifically, when the logic control module receives a fan running signal, a charging control signal, and the voltage monitoring value is greater than the first voltage threshold, the first switch module and the second switch module are controlled to be closed; when the logic control module receives a fan shutdown signal, a discharging control signal, and the voltage monitoring value is greater than the first voltage threshold, the first switch module is controlled to be open and the second switch module is controlled to be closed; when the logic control module receives a fan shutdown signal, a charging control signal, and the voltage monitoring value is less than the first voltage threshold, the first switch module is controlled to be closed and the second switch module is controlled to be open; when the logic control module receives a fan running signal, a charging control signal, and the voltage monitoring value is less than the first voltage threshold, the first switch module is controlled to be closed and the second switch module is controlled to be open.

[0048] In an embodiment, the logic control module is in communication connection with a remote control platform; the remote control platform generates charging and discharging control signals. Specifically, the logic control module sends a fan state signal and a voltage monitoring value to the remote control platform; when the fan state signal indicates that the wind turbine is in a running state and the voltage monitoring value is within a preset range, the logic control module or the remote control platform outputs a charging control signal and a discharging control signal; when the fan state signal indicates that the wind turbine is in a shutdown state and the voltage monitoring value is within a preset range, the logic control module or the remote control platform outputs a discharging control signal; when the voltage monitoring value is less than a first voltage threshold, the logic control module or the remote control platform outputs a charging control signal. In this embodiment, if the control process of charging and discharging is fully automatic control, the logic control module directly generates charging and discharging control signals; if human intervention is required, i.e., this automatic control, the worker performs the corresponding operation (such as pressing the backup power supply discharging button) on the remote control platform, and then the remote control platform generates a discharging control signal to the logic control module, and the logic control module controls the on-off of the switch module.

[0049] In an embodiment, the logic control module receives the first switch state signal generated by the first switch module and the second switch state signal generated by the second switch module and inputs them to the remote control platform, so that the remote control platform presents the on-off states of the first switch module and the second switch module to the user. Thus, the worker can observe the on-off states of the two switch modules and the on-off state of the backup power supply in real time on the control platform, and then manually control the charging and discharging of the backup power supply in combination with the running state of the fan.

[0050] The backup power supply charging and discharging control device provided in the application increases the discharging system of the backup power supply, increases the remote control system, and reduces the operation and maintenance personnel's on-site operation process.

[0051] In another embodiment, the embodiment is illustrated with a logic control module as a programmable logic controller (PLC). Referring to the attached drawings, the embodiment is illustrated as follows: Figure 2 The control signal and status signal of switch 1 in the wind turbine charging system are added in the PLC. The control signal and status signal are connected to the programmable logic controller (PLC); and switch 2 is added, the control signal and status signal of switch 2 are also connected to the programmable logic controller (PLC).

[0052] The discharge cabinet is connected to the other end of switch 2, and the discharge cabinet is mainly a resistor. The standby power discharge control signal is added in the remote monitoring room and communicated to the programmable logic controller (PLC); the voltage monitoring signal is added on the standby power and sent to the programmable logic controller (PLC); the wind turbine system fan shutdown signal is sent to the programmable logic controller (PLC).

[0053] In summary, the programmable logic controller (PLC) accesses signals: fan shutdown signal, switch 1 control signal, switch 1 status signal, switch 2 control signal, switch 2 status signal, standby power discharge control signal and standby power voltage monitoring signal. At the same time, the programmable logic controller (PLC) communicates to the remote monitoring room. The switch 1 status signal, switch 2 status signal, standby power voltage monitoring signal are sent to the remote monitoring room, and the standby power discharge control signal is sent from the remote monitoring room to the programmable logic controller (PLC).

[0054] The following is the control logic of the programmable logic controller (PLC):

[0055] Logic 1: When the fan is in operation, the switch 1 operation signal is locked out, and the switch 2 operation signal is locked out.

[0056] Logic 2: When the fan is in a shutdown state, the remote monitoring room gives a standby power discharge control signal, disconnects switch 1, and closes switch 2.

[0057] Logic 3: When the standby power monitoring voltage reaches the preset value, switch 2 is disconnected, and switch 1 is closed.

[0058] Logic 4: When logic 2 is in progress, the fan shutdown signal is lost, switch 2 is disconnected, and switch 1 is closed.

[0059] The PLC of the embodiment only performs discharge operation when receiving the discharge control signal issued by the remote control platform. In the specific application process, the main control system of the remote monitoring room issues the discharge signal of the standby power supply to the PLC after confirming the running state of the fan (which can also be confirmed by the operator) and referring to the recent wind speed without sudden change. If it is manually operated, the control personnel starts the discharge button of the standby power supply. At this time, the remote monitoring screen displays that the state of switch 1 changes from closed to open, and the state of switch 2 changes from open to closed, that is, the standby power supply is in the discharge state.

[0060] During the discharge process, the remote monitoring screen displays that the standby power supply monitoring voltage is in a descending state. When the standby power supply monitoring voltage drops to the preset value, the wind speed reaches the condition, the control wind turbine is started to charge the standby power supply, at this time, the remote monitoring screen displays that the state of switch 2 changes from closed to open, and the state of switch 1 changes from open to closed. If the wind speed suddenly changes during the voltage drop process, the wind turbine is started, the discharge process is suspended, the fan is started to charge the standby power supply, at this time, the remote monitoring screen displays that the state of switch 2 changes from closed to open, and the state of switch 1 changes from open to closed.

[0061] In the second aspect, the embodiment of the application provides a fan variable pitch system, which comprises a standby power supply and the standby power supply charge-discharge control device for fan variable pitch according to any one of the above embodiments, and the charge-discharge of the standby power supply is controlled through the standby power supply charge-discharge control device.

[0062] In the third aspect, the embodiment of the application provides a standby power supply charge-discharge control method for fan variable pitch, which is applied to the standby power supply charge-discharge control device for fan variable pitch according to any one of the above embodiments. Specifically, the method comprises the following steps:

[0063] The fan state signal and the voltage monitoring value are obtained, the charge-discharge control signal is generated according to the fan state signal and the voltage monitoring value, and then the on-off of the first switch module and the second switch module is controlled according to the fan state signal, the charge-discharge control signal and the voltage monitoring value, so as to realize the charging or discharging of the standby power supply.

[0064] Specifically, the fan state signal protects the fan shutdown signal and the fan operation signal; the charge-discharge control signal includes a charge control signal and a discharge control signal. Wherein, if the logic control module receives the fan operation signal and the discharge control signal, the first switch module and the second switch module are controlled to be closed; if the logic control module receives the fan shutdown signal and the discharge control signal, the first switch module is controlled to be opened and the second switch module is controlled to be closed; if the logic control module detects that the voltage monitoring value is less than the first voltage threshold value and receives the charge control signal, the first switch module is controlled to be closed and the second switch module is controlled to be opened; when the standby power supply is discharged, if the logic control module does not receive the fan shutdown signal, the first switch module is controlled to be closed and the second switch module is controlled to be opened.

[0065] In an embodiment, the generating the charge-discharge control signal according to the fan state signal and the voltage monitoring value includes: outputting the charge control signal and the discharge control signal when the fan state signal indicates that the wind turbine is in the running state and the voltage monitoring value is in the preset range; outputting the discharge control signal when the fan state signal indicates that the wind turbine is in the shutdown state and the voltage monitoring value is in the preset range; outputting the charge control signal when the voltage monitoring value is less than the first voltage threshold value.

[0066] In summary, the device, system and method provided by the present application can monitor the monitoring condition of the standby power supply in the fan operation by adding the standby power supply monitoring voltage. The standby power supply discharge function is remotely controlled, which avoids the operation and maintenance personnel to climb to the top of the tower of the fan and reduces the operation and maintenance cost. The standby power supply discharge function after the fan operation lockout is added, which avoids the personnel misoperation and ensures the reliable input of the standby power supply when the variable pitch main power supply fails.

[0067] It should be noted that the fan variable pitch system standby power supply charge-discharge control device provided by the present embodiment is used to realize the above-mentioned embodiments, which has been described and will not be described again. As used above, the terms "module", "unit", "sub-unit" and the like can be a combination of software and / or hardware that can realize a predetermined function. Although the device described in the above embodiments is preferably realized in software, the realization of hardware or a combination of software and hardware is also possible and conceived.

[0068] Each technical feature of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description concise, each technical feature of the above-mentioned embodiments is not described in all possible combinations, however, as long as the combination of these technical features does not exist contradictory, it should be considered as the scope of the present disclosure.

[0069] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A wind turbine variable pitch system backup power charge and discharge control device, characterized in that, The application is applied to an electric fan variable pitch system, comprising a first switch module, a second switch module, a voltage monitoring module, a logic control module and a discharge module. The first switch module is arranged between the fan variable pitch system and a backup power supply, the second switch module is arranged between the backup power supply and the discharge module, and the discharge module is used for releasing the electric quantity in the backup power supply. The detection end of the voltage monitoring module is connected with the backup power supply, the output end is connected with the logic control module, and the voltage monitoring module is used for monitoring the backup power supply in real time and outputting a voltage monitoring value to the logic control module. The logic control module is in communication connection with an external system, is used for receiving a fan state signal and a charge-discharge control signal, and controls the on-off of the first switch module and the second switch module according to the fan state signal, the charge-discharge control signal and the voltage monitoring value, so as to realize the charging or discharging of the backup power supply. The logic control module is in communication connection with a remote control platform, and the acquisition of the charge-discharge control signal comprises the following steps: The logic control module sends the fan state signal and the voltage monitoring value to the remote control platform, outputs the charge control signal and the discharge control signal when the fan state signal indicates that the wind turbine is in the running state and the voltage monitoring value is in the preset range, outputs the discharge control signal when the fan state signal indicates that the wind turbine is in the shutdown state and the voltage monitoring value is in the preset range, and outputs the charge control signal when the voltage monitoring value is less than the first voltage threshold.

2. The backup power source charge-discharge control device according to claim 1, characterized by The fan state signal comprises a fan shutdown signal and a fan running signal, the charge-discharge control signal comprises a charge control signal and a discharge control signal, and The control of the on-off of the first switch module and the second switch module according to the fan state signal, the charge-discharge control signal and the voltage monitoring value, so as to realize the charging or discharging of the backup power supply, comprises the following steps: If the logic control module receives the fan running signal and the discharge control signal, the first switch module and the second switch module are controlled to be closed; If the logic control module receives the fan shutdown signal and the discharge control signal, the first switch module is controlled to be disconnected and the second switch module is controlled to be closed; If the logic control module detects that the voltage monitoring value is less than the first voltage threshold and receives the charge control signal, the first switch module is controlled to be closed and the second switch module is controlled to be disconnected; When the backup power supply is discharged, if the logic control module does not receive the fan shutdown signal, the first switch module is controlled to be closed and the second switch module is controlled to be disconnected.

3. The backup power supply charge-discharge control device according to claim 1, characterized by The logic control module receives the first switch state signal generated by the first switch module and the second switch state signal generated by the second switch module and inputs the remote control platform, so that the remote control platform presents the on-off state of the first switch module and the second switch module to the user.

4. The backup power supply charge-discharge control device according to claim 1, wherein The logic control module is a programmable logic controller.

5. The backup power supply charge-discharge control device according to claim 1, wherein The discharge module is a discharge resistor cabinet.

6. The backup power supply charge-discharge control device according to claim 1, wherein The voltage monitoring module adopts a voltage monitor.

7. A wind turbine variable pitch system, characterized in that, The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method.

8. A wind turbine variable pitch system backup power charge and discharge control method, characterized in that, The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method.

9. The backup power supply charge-discharge control method according to claim 8, characterized by, The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable-pitch system backup power supply charging and discharging control method. The application discloses a wind turbine variable-pitch system backup power supply charging and discharging control device and a wind turbine variable

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