變壓器內(nèi)部溫升計算與運行方式優(yōu)化
[Abstract]:The hot spot temperature of transformer winding and the top oil temperature are the key parameters to measure the thermal state of transformer. It is important to calculate and predict the operation safety and insulation life of transformer. In this paper, a great deal of work has been done on the calculation of internal temperature rise of transformers, the calculation of heat dissipation efficiency and the optimization of operation mode taking into account the loss of insulation life. In this paper, the internal temperature rise calculation of traditional oil-immersed power transformer and a split cooling transformer for underground substations are studied. Aiming at the calculation of the top oil temperature of the traditional power transformer, two models are established in this paper: point prediction model and interval prediction model. Firstly, combining the advantages of semi-physical model and data-driven model, a top-level oil-temperature point prediction model based on kerne1 extreme 1earning machine,KELM error prediction compensation is established. The accuracy of the model is higher than that of the single semi-physical model and data-driven model. Then, a prediction model of transformer top oil temperature interval based on KELM and Bootstrap method is established. The upper and lower limit values of the prediction interval can be used as conservative and optimistic estimates of the top layer oil temperature of transformer, respectively. The conservative estimate is more suitable for guiding the operation of transformer. Finally, the calculation of internal temperature rise of split cooling transformer is studied. Split cooling transformers are generally used in underground substations where the transformer body is underground and the radiator is in the ground environment. Because of the difference in structure, the traditional calculation model of internal temperature rise of transformer is no longer suitable for this type of transformer, based on the analysis of the heat dissipation principle of this type transformer and the comparison with the traditional transformer heat path model, The heat path calculation model of oil-immersed self-cooling split cooling transformer is presented. The validity of the proposed model is verified by the temperature rise test data of the split cooling transformer. In this paper, a method for calculating the heat dissipation efficiency of transformers based on reverse solution of thermal resistance is established. Using the on-line monitoring data of the top oil temperature, the particle swarm optimization (partic1e swarm optimization,PSO) algorithm is used to reverse solve the thermal resistance of the top layer oil temperature to the environment. According to the ratio of actual thermal resistance to outgoing thermal resistance and the change trend of actual thermal resistance, the heat dissipation capacity of transformer is evaluated in order to find out the change of heat dissipation efficiency of transformer in time and to provide auxiliary information for the operation and maintenance of heat dissipation system. In this paper, it is put forward that reducing transformer thermal life loss is one of the objectives of transformer economic operation. Combined with the traditional objective of minimum comprehensive loss, the optimization model of multi-objective transformer operation mode is established. Based on the dual period control strategy of transformer, PSO algorithm is used to solve the optimal switching time of standby transformer. This paper provides a reference method for the economic operation of transformers from the angle of reducing thermal life loss.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM41
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