Predicting Iron Losses in Laminated Steel with Given Non-Sinusoidal Waveforms of Flux Density

Chen, Wei; Ma, Jien; Huang, Xiaoyan; Fang, Youtong

doi:10.3390/en81212384

Cited by 16 publications

(10 citation statements)

References 18 publications

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“…A posteriori methods, mostly based on empirical models, are used most commonly due to their simplicity. Their main drawback is the necessity to determine, in advance, the waveforms of the machine dynamic states [3]. Only on their base, may the power of losses in the core be determined.…”

Section: Introductionmentioning

confidence: 99%

Direct Consideration of Eddy Current Losses in Laminated Magnetic Cores in Finite Element Method (FEM) Calculations Using the Laplace Transform

Gołębiowski

Smoleń

2020

Energies

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The following article presents a computation procedure that enables us to simulate the dynamic states of electric machines with a laminated magnetic core, with direct consideration of the eddy current losses. The presented approach enables a significant reduction of the simulation process computational complexity. The verification of the obtained data correctness is based on a detailed balance of energy and power in the investigated system. The correctness of the obtained results was also confirmed by comparing them with the results included in norms that describe the losses in laminated sheets. The presented approach is based on expressing the equivalent permeability of transformer metal sheets by using RC or RL circuits. The impedances of these circuits are treated as the transmittance of Infinite Impulse Response filters (IIR) of the Laplace s variable. In this form they are implemented in direct calculations of the dynamics of electric machines based on field-circuital models, using the Finite Element Method (FEM). In this way, we present the method of including eddy current losses in laminated metal circuits of chokes or transformers, during calculations using the finite element method, with the IIR filter in the domain of the variable s of the Laplace transform. Eddy current losses are directly included in the calculation process. Therefore, they have a direct impact on the transient state waveforms. However, the use of the Laplace variable s caused an excessive increase in the number of state variables, and the overall computational efficiency of the presented method is sufficiently low so as to be used in the simulation process of electrical machine dynamic states with a relatively large number of elements in the FE Model.

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Section: Introductionmentioning

confidence: 99%

Direct Consideration of Eddy Current Losses in Laminated Magnetic Cores in Finite Element Method (FEM) Calculations Using the Laplace Transform

Gołębiowski

Smoleń

2020

Energies

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“…There is worldwide concern about core losses which should ideally be reduced [2]. In electrical transformers, losses are an important factor in thermal designs and electromagnetic analyses [3], [4]. In recent decades there has been great and rapid change in the manufacture of electrical transformers [5]- [10].…”

Section: Introductionmentioning

confidence: 99%

A Novel Method to Enhance the Core Design of Power Transformers Using Particle Swarm Optimization (PSO) Technique

Alyozbaky

Kadir

Izadi

2019

International Journal of Simulation: Systems, Science &Amp; Technology

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The reduction of losses in a power transformer is a significant topic in a power transmission grids, with the design of the core being one of the important factors related to the losses. In this study, an intelligent algorithm is developed using Particle Swarm Optimization (PSO) technique to find the optimum core design. Using a smart algorithm we consider a novel method to reduce the losses. To achieve this target, a nonlinear B-H curve with a 3D Finite-Element Method (FEM) is used to simulate the proposed model of core coupling with the PSO technique. Steady state analysis is considered in the simulation and the losses of the core and windings were considered a heat source inside the transformer. The results show core losses are reduced by 11 % and 5 % was achieved by the proposed model compared with the 90° butt-lap and 45° mitred designs respectively. The results were validated against the manufacturer's experimental measurements. Our proposed optimization techniques can be used to improve performance of electrical power transformers and can be applied to various transformers of different sizes and power rating.

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“…Thus, a worldwide concern on core losses exists and should be reduced . In electrical transformers, iron losses are important for thermal designs and electromagnetic analyses . In the past few contracts, we have witnessed rapid changes in the field of transformer design and manufacturing .…”

Section: Introductionmentioning

confidence: 99%

“…2 In electrical transformers, iron losses are important for thermal designs and electromagnetic analyses. 3 In the past few contracts, we have witnessed rapid changes in the field of transformer design and manufacturing. 4-6 As a general rule, increasing flux density by 1% increases losses by approximately 2%.…”

mentioning

confidence: 99%

A new approach of core structure model for 3-phase distribution transformer

Alyozbaky

Kadir

Izadi

et al. 2018

Int Trans Electr Energ Syst

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Summary Reducing the losses of 3‐phase transformers is still considered a significant target by many transformer designers and manufacturers. Core joint design is one of the factors related to the losses. In previous studies, core losses and flux density distribution motivated researchers to design appropriate T‐joints. However, the variation of load and thermal profiles are the most important factors related to the losses in transformers. This study proposed a new T‐joint configuration for the core of the 3‐phase transformer. The proposed model was built after considering the variation of load and thermal profiles. Results were compared with those of conventional T‐joint designs, such as butt‐lap and 45° mitered designs, that are currently used. The no‐load losses of the proposed model were reduced by more than 6.8% and 10% compared with those of the butt‐lap and mitered T‐joint designs, respectively. Furthermore, the total losses, the hot spot temperature of the core, and the oil temperature decreased significantly. The proposed model contributes to the literature on new T‐joint designs for improving transformer performance.

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Predicting Iron Losses in Laminated Steel with Given Non-Sinusoidal Waveforms of Flux Density

Cited by 16 publications

References 18 publications

Direct Consideration of Eddy Current Losses in Laminated Magnetic Cores in Finite Element Method (FEM) Calculations Using the Laplace Transform

Direct Consideration of Eddy Current Losses in Laminated Magnetic Cores in Finite Element Method (FEM) Calculations Using the Laplace Transform

A Novel Method to Enhance the Core Design of Power Transformers Using Particle Swarm Optimization (PSO) Technique

A new approach of core structure model for 3-phase distribution transformer

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