Abstract
Functioned by mechanical vibration, the electro-impulse de-icing (EIDI) system has been widely utilized in various industrial applications. With a focus on the minimum energy consumption, a new design of the EIDI system is proposed in this paper. To study the performance of this new design, a square aluminum plate representing the Turbine blades is tested. This plate is 420 mm in side-length, 1.5 mm in thickness and covered with a 1 mm thick ice layer. Within this paper, a novel method based on optimization theory is proposed to calculate the desired electric circuit parameters for the de-icing system to be able to remove the 1 mm thick ice layer effectively (96.8% removal rate). The actual EIDI system is then built with the desired circuit parameters calculated from the proposed method, and its performance on de-icing has been tested within the Xuefeng Mountain natural icing station. The tested results achieved a removal percentage of only around 84.3%, which is caused by defects from manufacturing. To further investigate this, a 3D impulse coil-aluminum plate model is built in MAXWELL reflecting the manufacturing defects, and the simulated results are consistent with the 84.3% ice removal rate from experiments on Xuefeng Mountain experiment station. This verified the accuracy of this proposed prediction method. This unique prediction method opened a new floor for the research area of electro-impulse de-icing system and its application.
Highlights
Blades icing poses a great hazard to the mechanical and aerodynamic performance of the wind turbine, which seriously affects the output efficiency of the wind generators
The main advantage of this design method is that it calculates the parameters based on the minimum energy consumption required to remove the ice layer
DESIGN OF ELECTRO-IMPULSE DE-ICING SYSTEM The key advance of this research work is to design the electro-impulse de-icing (EIDI) system with the consideration of the minimum energy requirement for effective de-icing
Summary
Blades icing poses a great hazard to the mechanical and aerodynamic performance of the wind turbine, which seriously affects the output efficiency of the wind generators. The main advantage of this design method is that it calculates the parameters based on the minimum energy consumption required to remove the ice layer. When calculating the structural-dynamic response, considering the impulse force as a single point source rather than the actual distribution will reduce the calculation accuracy This proposed method takes into consideration of the actual distribution of impulse force at different radial position as well as its actual evolution with time. When the current reaches its maximum value, di/dt = 0, so the time required to reach the peak value of the impulse current tmax can be calculated as: At this instantaneous time, the capacitor voltage equation can be written as:. The maximum mismatch between the calculated value and the measured value for the impulse current is around 1.5% This means the calculation method achieved at least 98.5% accuracy which is within the tolerance range for the purpose of the de-icing application
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