Development of sensors for wind power

2022-08-05
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Analysis on the development of wind power sensors editor's note: the application of sensors in the wind power industry is not limited to the wind power industry. As far as China's power industry is concerned, there are many occasions to use sensors. Pressure sensors, temperature sensors and flow sensors are mainly used in power plants and power stations, and voltage sensors and current sensors are mainly used in the field of power transmission and transformation

Gkong Schleswig Holstein in Germany is located between the North Sea and the Baltic Sea. Even if the wind is not strong, the wind turbine can still operate. If the wind direction changes by 8 degrees from northwest to north, the anemometer will transmit the sensed signal to the control system to control the yaw drive (3) to select the range device according to the hammer head to position the engine room to the appropriate position. Wind meter, including wind speed sensor and wind direction sensor, is developed with the development of wind power industry. Generally speaking, the wind speed sensor shall meet the measurement range of 0 ~ 60m/s, the error range shall be within 0.5m/s, and the working environment temperature shall meet the local air temperature conditions. The wind direction sensor shall meet the measurement range of 0 ~ 360 degrees, the accuracy shall be within 2.5 degrees, and the working environment temperature shall meet the local air temperature conditions

lijianlin, associate researcher of the new energy group of the Institute of electrical engineering, Chinese Academy of Sciences, said, "the stranded core design in the wind power industry means that there will be no single point of failure, which will promote the application of products such as high voltage and high current sensors, vibration sensors, temperature, humidity, wind measurement, and pressure sensors." Among them, because the current sensor is an essential component of the converter in the wind turbine, its application in the wind power industry is particularly important. In some inverters, small and PCB mounted current sensors are widely used. These sensors are part of the closed-loop control of the converter, which can ensure the fast response of the inverter. When the inverter and the intelligent power control of the generator are used at the same time, it can ensure that after the wind turbine is started, it can provide continuous power for electricity within a wide wind speed range until the turbine stops when the upper limit is as shown in the photo, from general-purpose clamps to special clamps for wire rod test pieces, and there are many kinds of wind speeds. In order to optimize the positioning of the driver, the sensors in each converter will continuously measure the current. The quality and response time of the circuit controller are finally determined by the design and performance of the current sensor. This is why closed-loop current sensors with low current ratings are widely used in the wind power industry. In addition to its excellent linearity and accuracy, the closed-loop electricity, especially the instrument flow sensor which is now used for experiments with high accuracy, also has the advantages of high bandwidth and fast response time

lijianlin pointed out that the domestic current sensor market still needs to be developed, especially the high current sensor technology, which is far behind the international level. As the domestic high current sensor technology is relatively immature, most domestic wind turbine manufacturers will choose imported products when purchasing high current sensors. The price of imported products is often higher than that of domestic products, which increases the pressure on production costs to a certain extent. In terms of small current sensor technology, there is no gap between the domestic technical level and the international level

since most domestic wind power stations are located in the "Three North regions" (North China, Northeast China and Northwest China) and coastal areas, and the climate is relatively harsh, wind turbines have higher requirements for sensor performance, especially for heating function, seismic resistance, anti high frequency electromagnetic interference, anti polarity reversal (connection) and anti impact and vibration of wind direction indicator, which are much higher than the performance indicators of general sensors, The tidal power station unit also requires the sensor to have good seawater corrosion resistance

lijianlin said that the application of sensors in the wind power industry is not limited to the wind power industry. As far as China's power industry is concerned, sensors are used in many occasions. Pressure sensors, temperature sensors and flow sensors are mainly used in power plants and power stations, and voltage sensors and current sensors are mainly used in the field of power transmission and transformation. Most of them are general-purpose sensors with low technical level but high requirements for reliability and stability. However, optical sensors with high technical level are rarely used in the power industry. Since the sensors of power plants and power stations are generally selected by the unit equipment manufacturers, there are relatively many sensors applied in China. The field of power transmission and transformation is different. Compared with the field of power generation, due to the relatively small one-time investment of sensors, each power region is not very sensitive to the price when selecting brands, and the use of some relatively new technologies can improve the level of power transmission and transformation. Therefore, foreign brands have more applications of sensors. "

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