Optimisation Of The Load Capacity Of Wind Turbine Cable Groups

In recent years,wind power generation has received a great deal of attention from countries around the world.As wind power technology has matured,the load capacity of wind turbine cables has furthermore become a major concern for power researchers.AC losses in the conductors and eddy current losses in the metal sheath during operation are the most important causes of temperature rise,so the calculation of losses and the optimisation of the load capacity are particularly important for the life of the cable.This paper therefore focuses on the following research work for cable laying in wind turbine towers:(1)Firstly,the finite element electromagnetic simulation software is used to construct a model for six 185mm~2 YJLW02 XLPE power cables in a 1500 k W wind turbine tower.On the basis of considering eddy current effect and skin effect,the current distribution,conductor AC loss and eddy current loss of metal jacket are calculated for a single-ended grounded double circuit three-phase cable in different arrangements,different phase sequences and different distances between cable cores The two arrangements with uniform current distribution are given.(2)In order to verify whether there are deviations between the segment modeling and the overall modeling calculation,a single wire temperature rise experiment was carried out to simplify the fan model,and an iterative calculation method was used at the segment intersection to ensure the continuity of the temperature at the segment,and the temperature rise distribution of the experimental segment model and the overall model was verified to be basically the same within the error tolerance;on this basis,the temperature field of the overall fan model was calculated,and the temperature rise distribution of the fan was given.On this basis,the temperature field of the overall wind turbine model was calculated and the temperature rise distribution of the wind turbine was given.(3)The flow and temperature fields of the different distribution structures of the cable groups inside the wind turbine tower were calculated.By comparing the temperature and flow fields of two different arrangements and different distances between conductors of the same arrangement,it was found that the air temperature near the conductors in the tower is lowest when the plane is arranged in "one",and increasing the conductor spacing will make the air temperature around the conductors decrease.When the conductor spacing is greater than 300 mm,the air temperature around the conductor gradually tends to a constant value and does not decrease all the time,so the conductor spacing is not conducive to heat dissipation.In this paper,the loss and temperature field of a cable group in a wind turbine tower is calculated by means of finite element calculations.By means of iterative calculations,segmental calculations for tall towers are achieved,reducing the requirements for computer configuration while maintaining high calculation accuracy and optimising the arrangement of the cable groups in the wind turbine tower.