Patent ID: 11914936
Assignee: WUHAN UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 0:
1. A method for controlling a transformer of a power grid by predicting a gas content in transformer oil of the transformer of the power grid based on a joint model stored in a memory, comprising:
step 1 of obtaining, through an oil chromatography online monitoring device of the power grid, an original concentration time series of the gas content in the transformer oil of the transformer of the power grid of gas to be predicted related to a failure of transformer of the power grid;
step 2 of performing, by a processor, empirical mode decomposition (EMD) on the original concentration time series based on the joint model stored in the memory to obtain a plurality of intrinsic mode function (IMF) components and 1 remaining component, and performing, by the processor, local mean decomposition (LMD) on the original concentration time series based on the joint model stored in the memory to obtain a plurality of product function (PF) components and 1 residual component;
step 3 of applying, by the processor, a deep belief network (DBN) on each one of the IMF components and the remaining component and each one of the PF components and the residual component respectively based on the joint model stored in the memory to obtain a concentration prediction result of a next moment;
step 4 of performing, by the processor, linear superposition and reconstruction on concentration prediction results of a same moment of each of the IMF components and the remaining component based on the joint model stored in the memory to obtain an EMD single-step prediction value, and performing, by the processor, the linear superposition and reconstruction on prediction results of a same moment of each of the PF components and the residual component based on the joint model stored in the memory to obtain an LMD single-step prediction value;
step 5 of performing, by the processor, multi-step extended prediction on the EMD single-step prediction value and the LMD single-step prediction value based on the joint model stored in the memory to obtain a concentration prediction value of the original concentration time series of a plurality of subsequent moments of the gas content in the transformer oil of the transformer of the power grid; and
step 6 of modifying, by the processor, an operation of the transformer of the power grid based on the concentration prediction value, wherein
the operation is maintained in response to the concentration prediction value being smaller than a threshold value, and
the operation is switched off to stop supplying power to the power grid through the transformer in response to the concentration prediction value not being smaller than a threshold value.