Research On The Effect Of Temperature Rise Of Dry-type Air-core Reactor On Reactive Power Compensation

The stability of electrical quality in industrial development has become one of the most critical factors.In order to improve the power quality of EHV transmission lines and the safety performance of the power grid,adding reactive power compensation equipment to EHV transmission lines is usually done through shunt reactors.The research object of this paper is the BKGKL-20000/35 dry-type air core reactor with 11-layer coaxial package.The influence of reactor temperature rise on reactive power compensation.The research and conclusions are as follows:The temperature rise of BKGKL-20000/35 dry-type air-core reactor is analyzed by finite element method.Without considering the influence of temperature,the simulation result is that the temperature increase of the sixth layer is at most 78 K;the temperature increase of the eleventh layer is at least 49 K.After considering the influence of temperature on the electrical parameters of dry-type air-core reactors,the simulation results show that the temperature rise of the sixth layer is at most 72 K,and the temperature rise of the eleventh layer is at least 44 K.Experimental data proves that the temperature rise of the sixth layer is at most 72.12 K,and the temperature rise of the eleventh layer is at least 44.9 K.The experiment verifies the accuracy of the simulated temperature distribution,and the simulation results considering the influence of temperature on the reactor parameters are closer to the actual operating rules.Use MATLAB / Simulink simulation software to establish the reactive power compensation model of the reactor circuit.After simplified calculation,the initial equivalent resistance is 0.0038 Ω,the inductance is 0.063 H,and the capacitance is330 PF.After the temperature rise reaches a steady state,the steady-state temperature is increased by 72 K,and the equivalent resistance is 0.0045 Ω,the inductance is0.063 H,and the capacitance is 380 PF.The theoretical calculation shows that the power factor is 0.89 without considering the temperature,and the power factor is0.905 when considering the temperature.The power factor is improved by 1.5%.In the simulation,the temperature influence was not taken into consideration.The simulation result showed that the reactive power was 263 Kvar.After considering the influence of temperature on the electrical parameters,the reading showed that the reactive power was 267 Kvar.The absorbed reactive power increased by 4 Kvar and the power factor increased by 1.53%.The simulation results are basically consistent with the theoretical derivation.The temperature rise generated when the parallel dry-type air-core reactor is working still mainly plays a role in maintaining the stability of the bus voltage,and has no effect on changing the size,but as the temperature increases,the power factor of the reactor increases.