Method for evaluating reactance parameters of independent three-winding transformer

Abstract

The invention discloses a method for evaluating reactance parameters of an independent three-winding transformer, comprising the following steps: 1) acquiring PMU multi-period data or SCADA multi-period data of the three-winding transformer based on a PMU or an SCADA three-winding transformer equivalent circuit; 2) building a static model based on the PMU multi-period data or the SCADA multi-period data according to the acquired PMU multi-period data or SCADA multi-period data; 3) forming a least squares target function of augmented reactance parameter evaluation based on the static model built in step 2), and using a Newton iteration method to solve the reactance parameter evaluation values of the three-winding transformer and the like; and 4) using a Monte Carlo simulation method to carry out further reactance parameter evaluation on the basis of the solved reactance parameter evaluation value of the three-winding transformer. The invention has the reactance parameter evaluation value unrelated to the initial value of the static model, better astringency, favorable robustness of the reactance parameter initial value and the like.

Description

technical field [0001] The invention relates to a method for estimating the reactance parameters of the three-winding transformer by using an equivalent circuit of the three-winding transformer; in particular, it relates to a method for estimating the reactance parameter of a single independent three-winding transformer. Background technique [0002] The reactance parameter value of the three-winding transformer is the most important physical parameter in the three-winding transformer, and it is the most important reference value for power operation management for the purpose of reducing reactive power loss and so on. Usually, the physical parameters including reactance parameter values ​​are obtained from the nameplate parameters of the three-winding transformer, or are measured at one time when it is put into operation; The value of will have a large change. Therefore, they (especially the values ​​of the reactance parameters) need to be re-estimated periodically. In the...

AI Technical Summary

Problems solved by technology

In this way, although they can achieve certain effects under certain conditions, since such a static model is established taking into account the estimation of other secondary physical parameters, the estimated value of its most important reactance parameter It will have adverse effects; especially for a single independent three-winding transformer, this effect is even greater, specifically causing the problem of poor convergence

In addition, when establishing measurement equations in the prior art, it is customary to use the admittance parameter (or the admittance parameter represented by the impedance parameter, that is, the impedance parameter appears on the denominator), and the admittance with a large value greatly amplifies the error Specifically, its convergence is worse, and the estimated value of its reactance parameter is closely related to the initial value of the corresponding static model, that is, the problem of poor robustness of the initial value of the reactance parameter

Images