Working method of a backup power supply for lubrication of a wind turbine

Abstract

The invention discloses a working method of a backup power supply for lubrication of a wind turbine, which includes the following two modes: 1) The first mode is the mode where the UPS host communicates successfully with the main controller. The UPS host judges that the command information frame received from the main controller is a standby instruction or a timed output instruction, and makes itself enter the standby mode or the timed output mode, and then intermittently supplies power to the lubricating oil pump; 2) The second mode is the mode where the UPS host fails to communicate with the main controller. The UPS host judges whether there is power at its input end, makes itself enter the standby mode or the timed output mode, and then intermittently supplies power to the lubricating oil pump; The invention is designed according to the lubrication and maintenance requirements of the wind turbine generator set. After the wind turbine generator set loses power, it controls the lubricating oil pump to start intermittently and provides power support to realize the lubrication and maintenance of each component of the wind turbine generator set and extend the service life of each component of the wind turbine generator set.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine power generation, and in particular to a working method of a backup power supply for lubrication of wind turbines. Background Art

[0002] At present, the working mode of the UPS used in offshore wind turbines is as follows: after the unit loses power, the UPS is automatically put into operation and continuously supplies power until the battery discharges to a preset cut-off voltage. The power that can be discharged by a standard battery cabinet containing 30 lead-acid batteries of 12V 150Ah is limited, and usually can only meet the power consumption requirements of the unit for 2 to 4 hours; for transmission chain components such as generator bearings in wind turbines, intermittent lubrication and maintenance are required when the wind turbine loses power and the required time is relatively long. Therefore, the existing working mode of the UPS is not applicable to the above-mentioned loads that need to be intermittently started for a long time. Summary of the Invention

[0003] The purpose of the present invention is to provide a working method of a backup power supply for lubrication of wind turbines to solve the deficiencies in the prior art. It is designed for the lubrication and maintenance requirements of wind turbines. After the wind turbine loses power, it controls the lubricating oil pump to start intermittently and provides power support to realize the lubrication and maintenance of various components of the wind turbine and extend the service life of various components of the wind turbine.

[0004] The present invention is realized through the following technical solutions: A working method of a backup power supply for lubrication of wind turbines, the backup power supply for lubrication is communicatively connected to the main controller of the wind turbine, and it includes a UPS host and a battery pack that are electrically connected and are used to intermittently start the lubricating oil pump in the wind turbine. The working method of the backup power supply for lubrication includes the following two modes:

[0005] 1) The first mode is the mode where the UPS host communicates successfully with the main controller, that is, the UPS host receives the command information frame sent by the main controller within a preset time, and includes the following steps:

[0006] The UPS host judges whether the command information frame received from the main controller is a standby instruction or a timed output instruction: If the UPS host judges that the received command information frame is a timed output instruction, it means that the wind turbine is in a power-off state, and the UPS host enters the timed output mode. At this time, the UPS host automatically closes the inverter output static switch in the UPS host at the preset start time to supply power to the lubricating oil pump;

[0007] If the UPS host determines that the received command information frame is a standby instruction, it means that the wind turbine is in a normal operating state. The UPS host enters the standby mode. At this time, the UPS host stops outputting, the inverter in the UPS host is in the standby state, and the rectifier in the UPS host operates to charge the battery pack. At the same time, the UPS host detects the charge and discharge status of the battery pack: when the UPS host detects that the battery pack has not undergone effective discharge within the first threshold time, it sends a power feed self-check request to the main controller. After the main controller agrees to the power feed self-check request, it opens the bypass to feed power to the power grid. During the power feed period, it detects the health status of the battery pack. If the main controller does not agree to the power feed self-check request, the rectifier in the UPS host continues to operate to charge the battery pack until it requests the power feed self-check from the main controller again after the second threshold time.

[0008] 2) The second mode is the communication failure mode between the UPS host and the main controller, that is, the UPS host cannot receive the command information frame sent by the main controller within the preset time, including the following steps:

[0009] At this time, the UPS host starts its own judgment logic: if the UPS host detects that there is power at its input end, the UPS host enters the standby mode. At this time, the UPS host stops outputting, the inverter in the UPS host is in the standby state, and the rectifier in the UPS host operates to charge the battery pack; if the UPS host detects that there is no power at its input end, the UPS host enters the timed output mode. At this time, the UPS host automatically closes the inverter output static switch in the UPS host at the preset start time to supply power to the lubricating oil pump.

[0010] Furthermore, the UPS host detecting the charge and discharge status of the battery pack includes the following steps:

[0011] When the UPS host detects that the battery pack has not undergone effective discharge within the first threshold time, it sends a power feed self-check request to the main controller. After receiving the request, the main controller judges whether the total load power currently running of the wind turbine is not less than the preset power feed power of the UPS host: if the total load power currently running of the wind turbine is not less than the preset power feed power of the UPS host, the main controller returns a flag agreeing to the power feed self-check to the UPS host. The UPS host opens the bypass and feeds power to the wind turbine power grid at a constant power through the inverter until the discharge reaches the preset discharge depth and then stops feeding power. At the same time, it detects the health status of the battery pack during the power feed period. If it detects that there is a problem with the health status of the battery pack, it issues an alarm; if the total load power currently running of the wind turbine is less than the preset power feed power of the UPS host, the main controller returns a flag disagreeing to the power feed self-check to the UPS host, and the UPS host continues to float charge until it requests the power feed self-check from the main controller again after the second threshold time.

[0012] Further, the RS485 interface of the backup power supply for lubrication is communicatively connected to the main controller of the wind turbine, and the number of battery packs is set according to the time requirement for intermittently starting the lubricating oil pump.

[0013] Further, the main controller is at the first priority of control for the backup power supply for lubrication.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0015] The present invention can control the intermittent start of the lubricating oil pump of the wind turbine and provide power support. At the same time, the backup power supply of the present invention adopts an energy-saving design. When the load does not require power supply, the UPS host will enter a standby mode with less energy consumption. Under the same backup power, this backup power supply can maintain the lubrication needs of the load for a longer time compared with the conventional backup power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a control logic block diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present invention will be further described below in conjunction with specific embodiments.

[0018] See Figure 1 As shown, it is a working method of the backup power supply for lubrication of a wind turbine provided in this embodiment, including the following two modes:

[0019] 1) The first mode is the mode where the UPS host communicates successfully with the main controller, that is, the UPS host receives the command information frame sent by the main controller within 60s, including the following steps:

[0020] The UPS host judges whether the command information frame received from the main controller is a standby instruction or a timed output instruction: If the UPS host judges that the received command information frame is a timed output instruction, it means that the wind turbine is in a power-off state, and the UPS host enters the timed output mode. At this time, the UPS host sets the start time according to the requirements of the components of the wind turbine that need to be lubricated, and automatically closes the inverter output static switch in the UPS host at the preset start time to supply power to the lubricating oil pump;

[0021] If the UPS host determines that the received command information frame is a standby instruction, it means that the wind turbine is in a normal operation state. The UPS host enters the standby mode. At this time, the UPS host stops outputting, the inverter in the UPS host is in the standby state, and the rectifier in the UPS host operates to charge the battery pack. At the same time, the UPS host detects the charge and discharge conditions of the battery pack: when the UPS host detects that the battery pack has not been effectively discharged for more than three months, it sends a power feed self-check request to the main controller. After receiving the request, the main controller determines whether the total load power currently running by the wind turbine is not less than the preset power feed power of the UPS host. If the total load power currently running by the wind turbine is not less than the preset power feed power of the UPS host, the main controller returns a flag agreeing to the power feed self-check to the UPS host. The UPS host opens the bypass and feeds power to the wind turbine grid at a constant power through the inverter until the discharge reaches the preset discharge depth and then stops feeding power. At the same time, the health status of the battery pack is detected during the power feed. If a problem is detected in the health status of the battery pack, an alarm is issued. If the total load power currently running by the wind turbine is less than the preset power feed power of the UPS host, the main controller returns a flag disagreeing to the power feed self-check to the UPS host. The UPS host continues floating charge until it requests a power feed self-check from the main controller again after one month.

[0022] 2) The second mode is the communication failure mode between the UPS host and the main controller, that is, the UPS host does not receive the command information frame sent by the main controller within 60 s, including the following steps:

[0023] At this time, the UPS host starts its own judgment logic: if the UPS host detects that there is power at its input end, the UPS host enters the standby mode. At this time, the UPS host stops outputting, the inverter in the UPS host is in the standby state, and the rectifier in the UPS host operates to charge the battery pack. If the UPS host detects that there is no power at its input end, the UPS host enters the timed output mode. At this time, the UPS host automatically closes the inverter output static switch in the UPS host at the preset start time to supply power to the lubricating oil pump.

[0024] In addition, the RS485 interface of the backup power supply for lubrication is communicatively connected to the main controller of the wind turbine. It includes a UPS host and a battery pack connected electrically. The number of the battery packs is set according to the time requirement for intermittently starting the lubricating oil pump. The main controller is at the first control priority of the backup power supply for lubrication, and finally intermittently starts the lubricating oil pump in the wind turbine to realize the lubrication and maintenance of each component of the wind turbine and extend the service life of each component of the wind turbine.

[0025] The above embodiments are only the preferred embodiments of the present invention, and do not limit the implementation scope of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A working method of a backup power supply for lubrication of a wind turbine generator set. The backup power supply for lubrication is communicatively connected to the main controller of the wind turbine generator set. It includes a UPS host and a battery pack connected electrically, and is used to intermittently start the lubricating oil pump in the wind turbine generator set. It is characterized in that, The working method of the backup power supply for lubrication includes the following two modes: 1) The first mode is the mode where the UPS host communicates successfully with the main controller, that is, the UPS host receives the command information frame sent by the main controller within the preset time, including the following steps: The UPS host judges whether the command information frame received from the main controller is a standby instruction or a timed output instruction: If the UPS host judges that the received command information frame is a timed output instruction, it means that the wind turbine is in a power-off state, and the UPS host enters the timed output mode. At this time, the UPS host automatically closes the inverter output static switch in the UPS host at the preset startup time to supply power to the lubricating oil pump; If the UPS host judges that the received command information frame is a standby instruction, it means that the wind turbine is in a normal operation state, and the UPS host enters the standby mode. At this time, the UPS host stops output, the inverter in the UPS host is in a standby state, and the rectifier in the UPS host operates to charge the battery pack; At the same time, the UPS host detects the charge and discharge conditions of the battery pack: When the UPS host detects that the battery pack has not been effectively discharged within the first threshold time, it sends a power feed self-check request to the main controller. After the main controller approves the power feed self-check request, it opens the bypass to feed power to the power grid. During the power feed period, it detects the health status of the battery pack. If the main controller does not approve the power feed self-check request, the rectifier in the UPS host continues to operate to charge the battery pack until it requests a power feed self-check from the main controller again after the second threshold time; 2) The second mode is the mode where the UPS host fails to communicate with the main controller, that is, the UPS host does not receive the command information frame sent by the main controller within the preset time, including the following steps: At this time, the UPS host starts its own judgment logic: If the UPS host detects that there is power at its input end, the UPS host enters the standby mode. At this time, the UPS host stops output, the inverter in the UPS host is in a standby state, and the rectifier in the UPS host operates to charge the battery pack; If the UPS host detects that there is no power at its input end, the UPS host enters the timed output mode. At this time, the UPS host automatically closes the inverter output static switch in the UPS host at the preset startup time to supply power to the lubricating oil pump.

2. The working method of a backup power supply for lubrication of a wind turbine generator set according to claim 1, characterized in that, The steps for the UPS host to detect the charge and discharge conditions of the battery pack include the following: When the UPS host detects that the battery pack has not been effectively discharged within the first threshold time, it sends a power feed self-check request to the main controller. After receiving the request, the main controller determines whether the total load power currently running on the wind turbine is not less than the preset power feed power of the UPS host. If the total load power currently running on the wind turbine is not less than the preset power feed power of the UPS host, the main controller returns a flag agreeing to the power feed self-check to the UPS host. The UPS host opens the bypass and feeds power to the wind turbine grid at a constant power through the inverter until the discharge reaches the preset discharge depth, then stops the power feed. At the same time, the health status of the battery pack is detected during the power feed, and an alarm is issued if a problem with the health status of the battery pack is detected. If the total load power currently running on the wind turbine is less than the preset power feed power of the UPS host, the main controller returns a flag disagreeing to the power feed self-check to the UPS host, and the UPS host continues to float charge until it requests a power feed self-check from the main controller again after the second threshold time.

3. The working method of a backup power supply for lubrication of a wind turbine generator set according to claim 1, characterized in that, The RS485 interface of the backup power supply for lubrication is communicatively connected to the main controller of the wind turbine, and the number of the battery packs is set according to the time requirement for intermittently starting the lubricating oil pump.

4. The working method of a backup power supply for lubrication of a wind turbine generator set according to claim 1, characterized in that, The main controller is at the first control priority of the backup power supply for lubrication.

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