Study On Economic Operation And Optimal Control Strategy Of Transformer

The Transformer is an important power equipment in power grid,but according to incomplete statistics,its power loss accounts for about 40 % of the total loss in the power grid.Therefore,it is of great significance to study its economic operation for energy saving,loss reduction and economic and environmental protection.If the economic operation of transformers can be realized,a large amount of energy will be saved and considerable benefits will be brought to China’s economy,which has a wide range of practical significance for promoting the development of national economy.Economic operation of transformer means the best and most economical operation mode when the transformer loss reaches the minimum under the premise of a certain load.Firstly,the calculation methods of transformer parameters and power loss are studied,and the main factors affecting the economic operation of transformer,such as the number of transformer switching and operation mode,are studied.At the same time,the transformer model is analyzed.Secondly,on the basis of studying the two-dimensional area map method and three-dimensional area map method,an improved control strategy of three-dimensional area map method is put forward according to the influencing factors.The control strategy is theoretically validated by using the historical operation data of Yixian 220 kV substation.The data show that the proposed optimal control strategy for transformer economic operation can reduce transformer losses.Finally,the transformer economic operation control device and PC monitoring platform are designed: the transformer economic operation control device collects real-time operation status and parameters information of transformer,and then optimizes the control strategy to control the transformer and capacitor switching,so as to achieve the purpose of transformer economic operation.PC monitoring platform can display and store the actual operation parameters of transformers,bus voltages on both sides,open and close status of circuit breakers,operation mode of transformers and daily load curve,and record the switching operation of transformers and capacitors.Through the research and design of optimal control strategy and switching device for transformer economic operation,it lays a certain foundation for further research on transformer economic operation.