Transmission communication system for type test transmission data of wind generating set

Abstract

The utility model provides a transmission communication system for wind generating set type test transmission data, which comprises a wind generating set and an anemometer tower, and the wind generating set is provided with tower drum test data collectors on blades, a main shaft, a cabin, a tower top, a tower middle and a tower bottom. Each tower drum test data collector is connected with an optical fiber switch through a CAN-to-TCP module, and the optical fiber switches are connected in sequence. According to the transmission communication system for the type test transmission data of the wind generating set, the acquired data of the wind generating set are transmitted by adopting a TCP / IP communication protocol, so that the data can be quickly transmitted; compared with a system formed by CAN communication, the system has the advantages of good compatibility and interoperability, strong resource sharing capability, long data transmission distance and high data transmission rate, can easily realize sharing of data of a control field and resources on an information system, and is very convenient to connect with interfaces of a computer and a server.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine generator communication systems, and specifically discloses a transmission communication system for transmitting data during type testing of a wind turbine generator. Background Art

[0002] The main reasons for the instability of existing wind turbine communication systems include:

[0003] 1. Increased communication data volume

[0004] As the demand for R&D testing from main engine manufacturers is increasing, the number of test channels has also increased exponentially. At the same time, due to the popularity of large blades in China, the number of test channels in blades and hubs has increased from the original 16 channels to the current 60 channels, and the data volume has increased by 4 times.

[0005] The standard test system uses the CAN 2.0A bus communication protocol. The data type of a test channel is a 32-bit real number. Normally, the maximum data segment in a CAN 2.0A message is 64 bits, so one CAN 2.0A ID can transmit data from two test channels. Given that a CAN message is 108 bits, 60 test channels require 30 CAN 2.0A messages, each 3240 bits long. Because the sampling frequency used in the test is 50 Hz, the minimum data transmission per second is 162,000 bits (162 kbit).

[0006] According to standards and relevant literature, to ensure that low-priority message transmission delays are within acceptable limits, the bus load factor should not exceed 30%. When the load factor exceeds 40%, CAN communication stability begins to decline. When it exceeds 65%, the stability decline accelerates. When it exceeds 98%, the network will be paralyzed. The stable and effective transmission rate of CAN bus communication should be at least 40% of the bandwidth, so the communication bandwidth should be at least 405kbit, and the lowest communication rate should be 500kbit / s for data transmission.

[0007] 2. Increase in communication distance

[0008] The wind turbine hub height for full-scale testing is generally around 120m, so the fiber length is typically 140m to 160m. Due to optical signal loss caused by using multimode fiber, the actual transmission rate on site is generally limited to 250kbit / s. Previously, when the wind turbine hub height was around 100m, a fiber length between 120m and 140m could achieve a communication rate of 500kbit / s.

[0009] 3. CAN’s anti-interference ability is limited

[0010] Since the generators of wind turbines are generally 1140V medium voltage and about 10MW, and the transmission chain structure is generally semi-direct drive, the slip ring line needs to pass through the middle of the generator, which will cause small disturbances and large disturbances; small disturbances are caused by normal load fluctuations, power and flow control, transformer tap adjustment and natural fluctuations in interconnecting line power; while large disturbances refer to disturbances caused by short circuits of system components, switching operations and other large power or impedance changes.

[0011] When the wind turbine is normally shut down, the inverter does not supply current to the generator, so the generator is not excited and does not interfere with CAN communication. The oscilloscope displays normal CAN communication as a square wave with a clear difference between the high and low potentials, and the data transmission success rate is 100%. When the wind turbine is started and connected to the grid, the generator generates interference that interferes with the CAN communication process. The oscilloscope displays the CAN communication waveform with obvious interference, making it impossible to effectively distinguish the difference between the high and low points. At the same time, the data transmission success rate is less than 50%.

[0012] From the above data, we can conclude that CAN communication is affected by many factors such as interference, long communication distance, and large amount of data, which proves that the stability of CAN communication signal transmission in high-voltage, large-megawatt, semi-direct-drive wind turbines is poor. Utility Model Content

[0013] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a transmission and communication system for transmitting data for type testing of a wind turbine generator set, comprising a wind turbine generator set and a wind measuring tower, wherein the wind turbine generator set is equipped with tower test data collectors on the blades, main shaft, nacelle, tower top, tower middle and tower bottom, and each tower test data collector is connected to a fiber optic switch through a CAN to TCP module, the fiber optic switches are connected in sequence, and the fiber optic switch connected to the bottom of the tower is connected to a data recorder through a CAN to TCP module, a main wind speed needle is installed on the top of the wind measuring tower, and a main wind vane, a reference wind vane, a lower blade 1 / 3 wind vane, a lower blade 2 / 3 wind vane and a lower blade 1 / 3 wind speed needle are installed on one side of the wind measuring tower in sequence from top to bottom, and a reference wind speed needle, a barometer, a thermometer and humidity meter, a lower blade 2 / 3 wind speed needle and a lower blade tip wind speed needle are installed on the other side of the wind measuring tower in sequence from top to bottom.

[0014] Preferably, the main wind vane, reference wind vane, lower blade 1 / 3 wind vane, lower blade 2 / 3 wind vane, lower blade 1 / 3 wind speed needle, reference wind speed needle, barometer, thermometer and hygrometer, lower blade 2 / 3 wind speed needle and lower blade tip wind speed needle are commonly connected to a meteorological data collector, the meteorological data collector is connected to a first wireless network bridge, the first wireless network bridge is connected to an Anybus communication module installed at the bottom of the wind turbine tower through a second wireless network bridge, the Anybus communication module is connected to an industrial server through a CAN communication port, and the Anybus communication module is connected to a data recorder through a CAN communication port.

[0015] Preferably, it is characterized in that: the communication system adopts TCP / IP protocol to transmit electrical signals, and the TCP / IP protocol adopts one optical fiber for communication in the cabin, tower top, tower middle and tower bottom.

[0016] Beneficial effects:

[0017] The transmission and communication system for transmitting data for type testing of wind turbine generator sets adopts TCP / IP communication protocol to transmit the collected wind turbine generator set data, so that the data can be transmitted quickly. Since Ethernet based on TCP / IP is a standard open network, compared with CAN communication, the system compatibility and interoperability of the system are good, and the resource sharing ability is strong. It can easily realize the sharing of data on the control site and resources on the information system. The data transmission distance is long and the transmission rate is high, and the connection with the computer and server interface is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 This is a topological diagram of the internal communication system of the wind turbine generator set of the utility model structure;

[0020] Figure 2 This is a communication topology diagram between the wind measurement tower and the wind turbine generator tower base of the utility model structure;

[0021] Figure 3 This is a schematic diagram comparing the CAN and TCP / IP optical fiber layouts of the utility model structure. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0023] The drawings in the embodiments of the present invention: different types of section lines in the drawings are not marked according to national standards, nor do they impose any requirements on the materials of the components. Instead, they are used to distinguish the cross-sectional views of the components in the drawings.

[0024] See also Figure 1-3 A transmission and communication system for transmitting data for type testing of a wind turbine generator set includes a wind turbine generator set and a wind measuring tower. The wind turbine generator set is equipped with tower test data collectors on the blades, main shaft, nacelle, tower top, tower middle and tower bottom, and each tower test data collector is connected to a fiber optic switch via a CAN to TCP module. The fiber optic switches are connected in sequence, and the fiber optic switch connected to the bottom of the tower is connected to a data recorder via a CAN to TCP module. A main wind speed needle is installed on the top of the wind measuring tower, and a main wind vane, a reference wind vane, a lower blade 1 / 3 wind vane, a lower blade 2 / 3 wind vane and a lower blade 1 / 3 wind speed needle are installed on one side of the wind measuring tower from top to bottom, and a reference wind speed needle, a barometer, a thermometer and humidity meter, a lower blade 2 / 3 wind speed needle and a lower blade tip wind speed needle are installed on the other side of the wind measuring tower from top to bottom.

[0025] Among them, the main wind vane, reference wind vane, lower blade 1 / 3 wind vane, lower blade 2 / 3 wind vane, lower blade 1 / 3 wind speed needle, reference wind speed needle, barometer, thermometer and humidity meter, lower blade 2 / 3 wind speed needle and lower blade tip wind speed needle are commonly connected to a meteorological data collector, the meteorological data collector is connected to a first wireless bridge, the first wireless bridge is connected to an Anybus communication module installed at the bottom of the wind turbine tower through a second wireless bridge, the Anybus communication module is connected to an industrial server through a CAN communication port, and the Anybus communication module is connected to a data recorder through a CAN communication port. The collected data can be output as test data using the Modbus TCP protocol through the meteorological data collector. Compared with the problem of signal attenuation and unstable communication caused by long optical fiber distance in CAN data transmission, its signal attenuation is smaller and the communication is more stable.

[0026] Among them, the communication system adopts TCP / IP protocol for electrical signal transmission, and TCP / IP protocol adopts one optical fiber for communication from the cabin, tower top, tower middle and tower bottom. At the same time, the communication rate of TCP / IP protocol is generally 100M bandwidth, which is much higher than the 1000k communication rate of CAN. At the same time, due to the high transmission rate of TCP / IP, all communication data can be on the same TCP / IP bus, without the existing independent CAN bus from cabin to tower bottom and one CAN bus from tower top to tower middle to tower bottom. This method wastes optical fiber and operation time. The TCP / IP protocol adopts one optical fiber for communication from cabin to tower top to tower middle and tower bottom. This method saves at least 50% of optical fiber usage and speeds up on-site work by 50%.

[0027] Among them, the communication system uses the following steps to collect and transmit data:

[0028] 1. Wind turbine communication:

[0029] S1. The tower test data collector collects data corresponding to the blades, main shaft, nacelle, tower top, tower middle and tower bottom of the wind turbine generator set, and outputs the test data through the CAN 2.0A communication protocol;

[0030] S2. The collected data is converted from CAN 2.0A to TCP / IP protocol test data through the CAN to TCP module;

[0031] S3, TCP / IP protocol test data is transmitted through the fiber optic switch. All data is finally aggregated to the fiber optic switch connected to the bottom of the tower. Then, the TCP / IP protocol test data is converted into CAN 2.0A protocol test data through the CAN to TCP module and transmitted to the data recorder.

[0032] 2. Communication between wind tower and wind turbine tower:

[0033] a. Use the meteorological data collector to measure the meteorological data of the main wind vane, reference wind vane, lower blade 1 / 3 wind vane, lower blade 2 / 3 wind vane, lower blade 1 / 3 wind speed needle, reference wind speed needle, barometer, thermometer and hygrometer, lower blade 2 / 3 wind speed needle and lower blade tip wind speed needle, and output the test data through the Modbus TCP protocol;

[0034] b. Transmitting the test data of the Modbus TCP protocol to the Anybus communication module through bridge wireless communication (the first wireless bridge and the second wireless bridge);

[0035] c. Convert Modbus TCP to CAN 2.0A protocol test data through the Anybus communication module;

[0036] d. Transmit the test data of CAN 2.0A protocol to the data recorder through the CAN communication port.

[0037] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A data transmission and communication system for wind turbine type testing, comprising a wind turbine and a wind tower, characterized in that: The wind turbine generator set is equipped with tower test data collectors on the blades, main shaft, nacelle, tower top, tower middle and tower bottom, and each tower test data collector is connected to a fiber optic switch via a CAN to TCP module. The fiber optic switches are connected in sequence, and the fiber optic switch connected to the bottom phase of the tower is connected to a data recorder via a CAN to TCP module. A main wind speed needle is installed on the top of the wind measurement tower, and a main wind vane, a reference wind vane, a lower blade 1 / 3 wind vane, a lower blade 2 / 3 wind vane and a lower blade 1 / 3 wind speed needle are installed on one side of the wind measurement tower from top to bottom, and a reference wind speed needle, a barometer, a thermometer and humidity meter, a lower blade 2 / 3 wind speed needle and a lower blade tip wind speed needle are installed on the other side of the wind measurement tower from top to bottom.

2. A wind turbine generator type test data transmission communication system according to claim 1, characterized in that: The main wind vane, reference wind vane, lower blade 1 / 3 wind vane, lower blade 2 / 3 wind vane, lower blade 1 / 3 wind speed needle, reference wind speed needle, barometer, thermometer and hygrometer, lower blade 2 / 3 wind speed needle and lower blade tip wind speed needle are commonly connected to a meteorological data collector, and the meteorological data collector is connected to a first wireless bridge, and the first wireless bridge is connected to an Anybus communication module installed at the bottom of the wind turbine tower through a second wireless bridge, and the Anybus communication module is connected to an industrial server through a CAN communication port, and the Anybus communication module is connected to a data recorder through a CAN communication port.

3. The wind turbine generator type test data transmission communication system according to claim 1, characterized in that: The communication system adopts TCP / IP protocol to transmit electrical signals, and the TCP / IP protocol adopts one optical fiber for communication in the cabin, tower top, tower middle and tower bottom.

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