A voltage transformer ratio error online estimation method and system

Abstract

The application provides a voltage transformer ratio error online estimation method and system, which comprises the following steps: based on the voltage measurement data collected by a transformer substation, a ratio error multi-objective optimization equation is constructed; an initial population is randomly generated in the solution space of the multi-objective optimization equation, and after the initial population is grouped, the multi-objective optimization equation is solved by using a cooperative evolution algorithm, and a subset with the maximum information entropy in the population is selected to train an ARIMA model; a time series stationary algorithm guided solution is generated by using the trained ARIMA model, the algorithm guided solution is added to the current population, and a non-dominated solution is iteratively generated in the cooperative evolution algorithm; when the preset maximum iteration number is reached, the ratio error estimation of the voltage transformer is calculated based on the non-dominated solution output by the cooperative evolution algorithm. Through the scheme, the ratio error solving efficiency can be improved, and the accuracy of the voltage transformer ratio error estimation can be ensured.

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