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Circulating Fluidized Bed Boiler (CFBB) is an important part of thermal power plants. The plant’s control system is a complex multivariable system with severe nonlinearities, uncertainty and strong coupling. It is not accurate to use traditional analysis methods to build mathematical models of the system. This paper introduces the modelling method of 330MW circulating fluidized bed boiler coordinated control system based on deep belief network (DBN), using the in-situ data of Inner Mongolia Jinghai Power Plant. Compared with the BP neural network modelling method, the effectiveness of the DBN method in the modelling of 330MW circulating fluidized coordinated control system is proved.

The Pad mounted Transformer is an important equipment for energy transfer in wind farm. Aiming at three cases of pad mounted transformer core heating faults occurring continuously in a wind farm, oil analysis and disintegration of the fault transformer are carried out, and the fault points causing the heating are found. In order to analyse the mechanism of the fault, the eddy current field analysis model is established by using finite element analysis software ANSYS MAXWELL to analyse the change. Quantitative calculation is carried out for the heating condition of the winding and core of the press. Through analysis, it is determined that there are defects in the manufacturing process of pad mounted transformer, and the reason of heating failure is that the low-voltage winding at the head contacts too closely with the iron core.

Under the impact voltage, the internal capacitive components of the capacitive voltage transformer are subjected to different voltages. Understanding the impulse response characteristics of the capacitive voltage transformer is of great significance for analyzing the internal insulation fault of the capacitive voltage transformer. In this paper, from the disintegration of a 500kV capacitive voltage transformer, based on the actual measurement of the capacitor and its internal components, the distributed parameter model of the capacitive voltage transformer is established. The response of the capacitive voltage transformer to the surge voltage is analyzed under the condition of lightning intruding wave and long line closing. The analysis shows that the capacitive element of the high-voltage side capacitor divider of the capacitive voltage transformer is subjected to the first and last ends of the capacitive voltage transformer. The voltage is higher than other capacitive components; when a partial capacitive component breaks down in the capacitive voltage divider, the voltage drop of the normal component under the same surge voltage increases, which will accelerate the damage of the capacitive component caused by the surge voltage; analysis conclusion and disintegration The results are in agreement and are of great significance for analyzing the internal insulation damage of capacitive voltage transformers.

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