Influence of field-dependent critical current on harmonic AC loss analysis in HTS coils for superconducting transformers supplying non-linear loads

Yazdani-Asrami, Mohammad; Gholamian, S. Asghar; Mirimani, Seyyed Mehdi; Adabi, Jafar

doi:10.1016/j.cryogenics.2020.103234

Cited by 20 publications

(21 citation statements)

References 49 publications

(75 reference statements)

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“…Magnetic flux density in the transformer is time-dependent and it varies along with respect to the height of superconducting windings, the nominal current of transformer, and the properties of the core. Axial and radial magnetic flux densities are expressed in equations ( 8) and (9) [13], [14]:…”

Section: B Magnetic Modelling Of An Hts Transformermentioning

confidence: 99%

“…. If we consider the point (𝑟 𝑖 , 𝑧 𝑗 ) of field calculation as 𝑃(𝑟 𝑖 , 𝑧 𝑗 ), then, we have equations (10) and (11) for 𝛼 and 𝛽 [13], [14]: At last perpendicular and parallel magnetic field can be calculated with respect to the twisting angle of HTS tapes around the former (𝜃 𝑓 ), as expressed in equations ( 12) and (13) [13], [14]:…”

mentioning

confidence: 99%

“…By knowing the values of the magnetic field, total loss in transformer could be calculated using equation (14) [15]:…”

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confidence: 99%

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Role of Insulation Materials and Cryogenic Coolants on Fault Performance of MW-Scale Fault-Tolerant Current-Limiting Superconducting Transformers

Yazdani-Asrami

Sadeghi

Seyyedbarzegar

et al. 2023

IEEE Trans. Appl. Supercond.

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Fault-Tolerant Current-Limiting (FTCL) High Temperature Superconducting (HTS) transformers are promising components for playing a role in renewable energy integrated modern power systems. In this paper, the impact of different insulation materials and cryogenic fluids on the electro-thermal characteristic of a MW-scale FTCL-HTS transformer is investigated. For this purpose, an Equivalent Circuit Model (ECM) is established to characterize the temperature, recovery time, and fault tolerability of FTCL-HTS transformer under different conditions. The proposed ECM is firstly validated using experimental results of a typical HTS transformer. After that the model is developed for a 50 MVA, 132 kV/13.8 kV HTS transformer. In order to add fault tolerance capability to the 50 MVA HTS transformer, three strategies were considered in this paper. In the first strategy, the effect of three insulation materials (including Kapton tapes, Nomex papers, and Acrylated Urethane solid insulation) covering HTS tapes was investigated on fault performance. The second strategy was changing cryogenic fluid to liquid hydrogen instead of liquid nitrogen. As for the last strategy, the impacts of thickness and material properties of stabilizer in HTS tape were investigated on the maximum temperature and recovery time of HTS transformer. Results show that by using these strategies, the maximum temperature of HTS tape of transformer winding under a short circuit fault was reduced.

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Section: B Magnetic Modelling Of An Hts Transformermentioning

confidence: 99%

mentioning

confidence: 99%

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Role of Insulation Materials and Cryogenic Coolants on Fault Performance of MW-Scale Fault-Tolerant Current-Limiting Superconducting Transformers

Yazdani-Asrami

Sadeghi

Seyyedbarzegar

et al. 2023

IEEE Trans. Appl. Supercond.

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“…When the harmonic distortion goes beyond the standard levels, it causes numerous issues such as poor energy efficiency, excessive power loss, and overheating problems due to harmonic overloading of frequency-dependent apparatuses including lines, transformers, cables, and motors. This issue can reduce their load capacity, protection equipment malfunction, revenue measurement errors, and possibility of resonances at various harmonic frequencies that leads to voltages and currents spikes [6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of C-Type Filter in Harmonics Polluted Distribution Systems

2022

Self Cite

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This paper aims to find the optimal size of parameters of a C-type filter in a non-sinusoidal system using a new optimization method called the Archimedes optimization algorithm (AOA). The inductance and capacitance values of the filter are acquired in which the power loss in the Thevenin resistor and the power loss characteristics of the load bus are minimized based on a new proposed objective function. Subject to technical and practical limitations of the IEEE 519 standard, an optimization problem is defined to achieve an optimal filter design that can increase the system power quality. The effectiveness of the proposed method is proved by comparison with the recent previously published methods. The results show the effectiveness of the proposed approach using the AOA in finding the minimum power losses and the harmonic content of frequency-dependent components. Eventually, the current study confirmed that the suggested objective function minimizes power losses of fundamental and harmonic order harmonics in non-sinusoidal systems.

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“…In addition, the effects of harmonics on the power system are as follows: the possibility of amplification of harmonic levels, efficiency reduction, ageing of electrical plant components, and malfunction [4,5]. To solve these problems, various studies have been conducted to mitigate harmonics of distribution systems using filters [6][7][8][9][10][11]. In particular, the effect is evaluated by sharing application case study on the real power system as in this paper [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Harmonic Mitigation Using Passive Harmonic Filters: Case Study in a Steel Mill Power System

Park¹,

Lee

Yoo³

et al. 2021

Energies

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In this study, we mitigated the harmonic voltage in a power system that contained the roughing mill (RM) and finishing mill (FM) motor drives. AC/DC converter type RM drive is a non-linear, large-capacity varying load that adversely affects power quality, e.g., a flicker, voltage distortion, etc. The voltage drop can be compensated within a certain limit by using the proper capacity of a power capacitor bank. In addition, the voltage distortion can be controlled as per the guidelines of IEEE Std. 519 using the passive harmonic filter corresponding to the characteristic harmonics of the motor drive load. The passive harmonic filter can provide an economical solution by mitigating the harmonic distortion with a proper reactive power supply. However, at the planning level, attention should be paid to avoid system overvoltage that is caused by the leading power under light load conditions and also the problem of parallel resonance between the harmonic filter and the step-down transformer. In addition, when designing the filter reactor, the K-factor and peak voltage must be considered; the filter capacitor also requires a dielectric material that considers the harmonic peak voltage. The purpose of this study was to acquire a better understanding of the filter applications as well as verify the field measurement, analysis, and design of harmonic filters together with its performance.

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Influence of field-dependent critical current on harmonic AC loss analysis in HTS coils for superconducting transformers supplying non-linear loads

Cited by 20 publications

References 49 publications

Role of Insulation Materials and Cryogenic Coolants on Fault Performance of MW-Scale Fault-Tolerant Current-Limiting Superconducting Transformers

Role of Insulation Materials and Cryogenic Coolants on Fault Performance of MW-Scale Fault-Tolerant Current-Limiting Superconducting Transformers

Optimal Design of C-Type Filter in Harmonics Polluted Distribution Systems

Harmonic Mitigation Using Passive Harmonic Filters: Case Study in a Steel Mill Power System

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