A Research Of Practical Method About Power Transformer Economic Operation

The loss of power transformers accounts for major proportion in the loss of the power system, so one of the effective measure to reduce loss and save energy is to realize economic operation of the transformer. But from the present status in this field, how to effectively realize economic operation of the transformer has not been settled very well. This dissertation chiefly studies how to effectively realize economic operation of the transformer based on the existing SCADA system and equipments of the district power network. The principal work is as following:Firstly, some basic issues of economic operation of the transformer are analyzed, focusing on calculating the economic load coefficient, carving up the running area of the transformer, determining the quality between transformers, and confirming economic operation mode of transformers in the parallel or divided running pattern.Secondly, a method based on SCADA to revise the parameter of transformers is proposed, in which the data is obtained from the substation SCADA system and is processed by least orthogonal square method, then the fitting calculation of the curve is performed, finally the actual parameters of the transformer can be derived and it can be used as the basic data for the economic operation of the transformer.Thirdly, a short-term load forecasting method based on ANN (artificial neural network) is proposed, as the load fluctuates frequently in some substations. And the real-time data is according to the result of the short-term load forecasting.At last, the optimal switch-on/off time can be determined eventually by the proposed both Time-interval Control Method and Fuzzy Decision. The result of simulation shows that the two method are also effective. But the Fuzzy Decision is easy to apply in practice.