A wind turbine generator cold start control method and system

Abstract

The invention discloses a cold start control method and system for a wind turbine generator. The method is specifically as follows: a wind turbine shutdown time, a wind speed, an ambient temperature, a cabin temperature and a gearbox oil temperature are obtained and transmitted to SCADA; SCADA transmits the data to a control system; when the wind turbine meets one of the following three conditions, namely, the wind speed is greater than 1.5 m / s and the gearbox oil temperature is lower than 5° C., the wind turbine enters a cold start mode, the shutdown time exceeds 2 hours, the ambient temperature is lower than 5° C., and the cabin ambient temperature is lower than 15° C.; the invention avoids erroneous cold starts caused by errors of wind turbine sensors by monitoring wind speed, gearbox oil temperature, ambient temperature, wind turbine shutdown time and cabin temperature; the invention monitors the temperature of gear oil at all times during the cold start process, and adjusts the control strategy according to different gear oil temperatures; monitors the temperature of the gearbox bearing, and calculates the temperature difference between the bearing and the gearbox oil temperature, so as to avoid damage to the bearing due to excessive temperature difference.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and in particular relates to a cold start control method and system for a wind generator. Background Art

[0002] In a cold environment, wind turbines will inevitably be started after being shut down and cooled. The lower ambient temperature will cause the gearbox oil temperature to be lower. Under the condition of lower oil temperature, directly starting the gearbox will cause irreversible damage to the gearbox due to the low gear oil temperature and high oil viscosity. The existing conventional cold start control strategy is to heat the gear oil by heating the gear oil and controlling the gearbox rotation. However, there is no real-time monitoring of the gearbox oil temperature to adjust the cold start control strategy, and the control system cannot determine the optimal cold start control strategy. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides control logic for cold start of automatic control of the fan. By monitoring the ambient temperature, gear box oil temperature, and bearing temperature, the cabin environment heating, gear oil electric heating, gear box low speed operation, and gear oil lubrication pump high speed operation are controlled at different temperatures. The optimal control strategy is used to achieve uniform heating of the gear box and reach a temperature that can achieve full power of the fan at a faster speed.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: a wind turbine cold start control method, which obtains the wind turbine shutdown time, wind speed, ambient temperature, cabin temperature and gearbox oil temperature of the wind turbine, and transmits them to SCADA; SCADA transmits the data to the control system;

[0005] The fan enters cold start mode when the fan speed is greater than 1.5m / s and the gearbox oil temperature is lower than 5℃ and one of the following three conditions is met: the shutdown time exceeds 2 hours, the ambient temperature is lower than 5℃, and the ambient temperature in the cabin is lower than 15℃.

[0006] The gearbox bearing temperature and gearbox oil temperature are acquired in real time and transmitted to the SCADA and control system; the fan is cold-started according to the gearbox bearing temperature and gearbox oil temperature. The cold-start control strategy is as follows:

[0007]

[0008] When the gearbox oil temperature is within the range of -20 to 5°C, the gearbox circulation pump will be stopped if the temperature difference between the bearing temperature and the gearbox oil temperature exceeds the set temperature difference.

[0009] The set temperature difference is 5°C.

[0010] The downtime of the wind turbine is judged by the difference between the downtime time of the wind turbine in the SCADA data and the current time, the external wind speed is obtained by the anemometer, the ambient temperature is obtained by the sensor arranged outside the cabin, the temperature inside the cabin is obtained by the temperature sensor arranged inside the cabin, and the gearbox oil temperature is obtained by the temperature sensor arranged inside the gearbox; the anemometer, the sensor outside the cabin, the temperature sensor inside the cabin and the temperature sensor inside the gearbox are connected to the input end of the data acquisition and monitoring control system, and the output end of the data acquisition and monitoring control system is connected to the input end of the control system.

[0011] In offshore areas, the external humidity and the humidity inside the cabin are also monitored in real time, and the humidity threshold for activation is set.

[0012] On the other hand, the present invention provides a wind turbine cold start control system, including an anemometer, a sensor outside the cabin, a temperature sensor inside the cabin, a temperature sensor inside the gear box, a data acquisition and monitoring control system, and a controller; the anemometer, the sensor outside the cabin, the temperature sensor inside the cabin, and the temperature sensor inside the gear box are all connected to the input end of the data acquisition and monitoring control system, the output end of the data acquisition and monitoring control system is connected to the input end of the controller, the output end of the controller is connected to the cabin heating fan, the gear box oil temperature heating system, and the gear box oil pump control signal input end, and the controller performs cold start control on the wind turbine based on the control method described in the present invention.

[0013] The present invention can also provide a wind turbine generator set, which adopts the above-mentioned cold start control system.

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

[0015] Compared with the prior art, the present invention avoids erroneous cold starts caused by fan sensor errors by monitoring wind speed, gear box oil temperature, ambient temperature, fan shutdown time and cabin temperature; the present invention monitors the temperature of the gear oil at all times during the cold start process, and adjusts the control strategy according to different gear oil temperatures; the present invention monitors the temperature of the gear box bearings during the cold start process, and calculates the temperature difference between the bearing and the gear box oil temperature to avoid damage to the bearings due to excessive temperature differences; the present invention adjusts different gear box maximum speeds according to different oil temperatures during the cold start process to avoid excessively high gear box speeds at too low a temperature, which would cause damage to the gear box.

[0016] Furthermore, based on the control method of the present invention, the fan can select different cold start control strategies according to different gearbox oil temperatures, ensuring that the gearbox uses the optimal cold start strategy to cold start the gearbox at the fastest speed while ensuring that the life of the gearbox is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a cold start control strategy of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0020] Step A: Obtain the downtime of the fan, and determine the downtime of the fan by the difference between the downtime of the fan in the SCADA data and the current time.

[0021] Step B: Obtain the wind speed of the fan, obtain the external wind speed through the anemometer and wind direction instrument, and transmit it to SCADA. The control system obtains the wind speed value of the fan in the SCADA data.

[0022] Step C: Obtain the ambient temperature by using a sensor arranged outside the cabin and transmit it to SCADA. The control system obtains the ambient temperature value of the fan from the SCADA data.

[0023] Step D: Obtain the cabin temperature. The cabin temperature is obtained by a temperature sensor arranged inside the cabin and transmitted to SCADA. The control system obtains the fan cabin temperature from the SCADA data.

[0024] Step E: obtaining the gearbox oil temperature by using a temperature sensor disposed inside the gearbox and transmitting the temperature to SCADA. The control system obtains the gearbox oil temperature in the SCADA data.

[0025] If the fan meets the wind speed value greater than 1.5m / s and the gearbox oil temperature value lower than 5℃, and one of the following three conditions is met, the fan enters the cold start mode: ① the shutdown time exceeds 2 hours, ② the ambient temperature is lower than 5℃, and ③ the ambient temperature in the cabin is lower than 15℃.

[0026] Step F, obtaining the gearbox bearing temperature, obtaining the gearbox bearing temperature through a temperature sensor arranged on the gearbox bearing, and transmitting it to SCADA, and the control system obtains the gear bearing oil temperature in the SCADA data.

[0027] Step G: The gearbox oil temperature value obtained in step E is constantly monitored, and the fan is controlled to perform cold start at different temperatures according to different control strategies in Table 1.

[0028] Table 1

[0029]

[0030] This table takes a doubly-fed wind turbine as an example. The gearbox temperature range, gearbox speed at different temperatures, and the temperature difference range of the gear oil and bearings are all based on this doubly-fed wind turbine as an example. The values ​​for different wind turbines will be different.

[0031] Optionally, the air humidity in offshore areas is high, and icing is prone to occur under low temperature conditions. In offshore areas, the external humidity and the humidity in the cabin are also monitored in real time, and a humidity threshold for startup is set, while the humidity value is considered as a reference indicator.

[0032] Based on the above embodiments, the present invention can also provide a wind turbine cold start control system, including an anemometer, a sensor outside the cabin, a temperature sensor inside the cabin, a temperature sensor inside the gearbox, a data acquisition and monitoring control system, and a controller; the anemometer, the sensor outside the cabin, the temperature sensor inside the cabin, and the temperature sensor inside the gearbox are all connected to the input end of the data acquisition and monitoring control system, the output end of the data acquisition and monitoring control system is connected to the input end of the controller, the output end of the controller is connected to the cabin heating fan, the gearbox oil temperature heating system, and the gearbox oil pump control signal input end, and the controller performs cold start control on the wind turbine based on the control method described in any one of claims 1 to 6.

[0033] At the same time, a wind turbine generator set adopting the cold start control system is provided to adapt to better operation in a cold environment.

[0034] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wind turbine cold start control method, characterized in that: Obtain the fan downtime, fan wind speed, ambient temperature, cabin temperature and gearbox oil temperature, and transmit them to SCADA; SCADA transmits the data to the control system; The fan enters cold start mode when the fan speed is greater than 1.5m / s and the gearbox oil temperature is lower than 5℃ and one of the following three conditions is met: the shutdown time exceeds 2 hours, the ambient temperature is lower than 5℃, and the ambient temperature in the cabin is lower than 15℃; the gearbox bearing temperature and gearbox oil temperature values ​​are obtained in real time and transmitted to the SCADA and control system; the fan is cold started according to the gearbox bearing temperature and gearbox oil temperature values. The cold start control strategy is as follows: ； When the gearbox oil temperature is within the range of -20~5℃, the gearbox circulation pump is stopped if the temperature difference between the bearing temperature and the gearbox oil temperature exceeds the set temperature difference; the set temperature difference is 5℃; the fan downtime is judged by the difference between the fan downtime time and the current time in the SCADA data, the external wind speed is obtained by the anemometer, the ambient temperature is obtained by the sensor arranged outside the cabin, the temperature inside the cabin is obtained by the temperature sensor arranged inside the cabin, and the gearbox oil temperature is obtained by the temperature sensor arranged inside the gearbox; the anemometer, the sensor outside the cabin, the temperature sensor inside the cabin and the temperature sensor inside the gearbox are connected to the input end of the data acquisition and monitoring control system, and the output end of the data acquisition and monitoring control system is connected to the input end of the control system.

2. The wind turbine generator cold start control method according to claim 1, characterized in that: In offshore areas, the external humidity and the humidity inside the cabin are also monitored in real time, and the humidity threshold for activation is set.

3. A wind turbine cold start control system, characterized in that: It includes an anemometer, a sensor outside the cabin, a temperature sensor inside the cabin, a temperature sensor inside the gearbox, a data acquisition and monitoring control system and a controller; the anemometer, the sensor outside the cabin, the temperature sensor inside the cabin and the temperature sensor inside the gearbox are all connected to the input end of the data acquisition and monitoring control system, the output end of the data acquisition and monitoring control system is connected to the input end of the controller, the output end of the controller is connected to the cabin heating fan, the gearbox oil temperature heating system and the gearbox oil pump control signal input end, and the controller performs cold start control on the wind turbine based on the control method described in claim 1 or 2.

4. A wind turbine generator set, characterized in that: The cold start control system according to claim 3 is adopted.

Images