Estimation of Equivalent Circuit Parameters of Single-Phase Transformer by Using Chaotic Optimization Approach

Martin Ćalasan,Danilo Mujičić,Vesna Rubežić,Milovan Radulović

doi:10.3390/en12091697

Abstract

This paper deals with parameter estimation of single-phase transformer equivalent circuit by using Chaotic Optimization Approach (COA). Unknown transformer equivalent circuit parameters need to be accurately estimated for the best possible matching between the measured and the estimated transformer output characteristics (for example, output power—load resistance characteristic). Unlike literature approaches which apply different estimation techniques and are based either on the nameplate data or the load data obtained from experiments, in this paper the use of COA is evaluated on both types of input data. For two single-phase transformers, different with respect to machine power and voltage levels, the COA-based parameter estimation is compared to various literature techniques as well as to classical method based on open-circuit and short-circuit tests. The results show that COA outperforms other approaches in terms of average error between the measured and the estimated values of the primary current, secondary current and secondary voltage at full load, or between the measured and the estimated output characteristics. The effectiveness of COA is additionally confirmed through its application on laboratory 2kVA, 220 V/110 V, 50 Hz single-phase transformer.

Highlights

Power transformers represent one of the main parts of transmission and distribution systems [1]and are ubiquitous in power electronics applications
The experimental setup used for obtaining the data is composed of a one-phase transformer (KONCAR, 2 kVA, 220 V/110 V, 50 Hz) which supplies one variable resistor
Chaotic Optimization Approach can be successfully applied for the single-phase transformer

Summary

Introduction

Power transformers represent one of the main parts of transmission and distribution systems [1]and are ubiquitous in power electronics applications. The analysis of power systems and of any power electronics circuit containing transformers, requires accurate transformer model [2,3]. Transformer modeling, i.e. the estimation of transformer equivalent circuit parameters, is an important subject in many studies (power systems, stability, modeling of power electronics converters etc.). It is necessary for transformer design, diagnostic purposes and service information [4,5]. Equivalent circuit parameters characterize the behavior and performance of a transformer. Estimation of transformer equivalent circuit parameters can provide significant information about the condition, performance and behavior of the machine, on one hand, and to its operation on grid, on the other

Methods

Results

Conclusion