Research And Development On Constant Temperature Control System For Postcure Process Of Wind Turbine Blade

Postcure is one of the key links in the manufacturing process of the wind turbine blade, and the constant temperature control effect in blade cavity directly affects the quality of the product. At present, because the commonly used resistance wire-heating mode does not have the heat absorption characteristics, it is difficult to control the temperature that is changing nonlinearly and has the character of time lag. In this case, the blade is easy to damage. Therefore, the temperature control mode of circulating water heating was put forward in this paper. The adaptive fuzzy PID control technology is adopted to realize the internal temperature control in cavity. Because the temperature control system has problems that the intelligent level is low, and the monitoring effect is poor, this paper has developed a set of temperature control system for wind turbine blade’s cavity postcure. The main research achievements are as follows:Firstly, temperature control scheme based on water heating was set up. According to the control characteristics of the water heater, temperature control scheme was adopted with S7-200 PLC controlling ducting angel of controllable silicon in the hardware. Wireless sensing network of temperature collecting was built according to on-site condition. Wireless transmission module and the hardware circuit were developed, and protocol and data acquisition program were designed. Digital filtering technology was applied to ensure the accuracy of temperature signal’s acquisition. The test interface was designed based on Delphi software. Test results showed that the data acquisition of wireless sensor network had high stability and accuracy.Secondly, the fuzzy control theory and PID control technology were combined to develop an adaptive fuzzy PID control algorithm for constant temperature control of blade cavity. The algorithm could calculate the deviation and variation rate of the deviation for the actual temperature value and set value by collecting the internal temperature of the blade cavity within the prescribed sampling period. Then Comparison value was fed into a fuzzy controller operation that invokes the online fuzzy control rules to modify the PID parameters. Therefore, The PLC output current value could be calculated. Finally, the output power of the water heater could be adaptive adjusted to ensure the stable internal temperature of wind turbine blades’ cavity postcure. The simulation results showed that the control algorithm has good dynamic characteristics. The test results showed that the postcure temperature error under the control of the algorithm was stable within 2 degrees, which can meets the requirements of the blade’s manufacturing.Finally, friendly human-machine control interface based on MCGS configuration software was developed, including the main interface and the sub interface. Real-time display of the current operating state, data storage and alarm functions was achieved. Moreover, PPI communication with the lower machine was realized to ensure the smooth progress of the whole postcure process.