Solution Techniques for Electromagnetic Transient Analysis

Martínez-Velasco, Juan A.

doi:10.1002/9781119480549.ch3

Cited by 3 publications

(4 citation statements)

References 38 publications

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“…In order for these requirements to be met, appropriate numerical methods should be sought for the approximation of differential equations and for solving the equation systems of the developed mathematical model. In the above-mentioned publications on real-time simulators (excluding [20,22,24]) and in additional important books on mathematical modeling of power systems [25][26][27], two methods of approximating differential equations are proposed: backward Euler method and trapezoidal rule. The use of the backward Euler method involves a small integration step of the order of single µs, so the real-time simulator must have high computing power to be able to obtain the results of the calculations.…”

Section: Introductionmentioning

confidence: 99%

The Use of a Real-Time Simulator for Analysis of Power Grid Operation States with a Wind Turbine

Kłosowski

Cieślik

2021

Energies

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The main issue in this paper is the real-time simulator of a part of a power grid with a wind turbine. The simulator is constructed on the basis of a classic PC running under a classic operating system. The proposed solution is expected and desired by users who intend to manage power microgrids as separate (but not autonomous) areas of common national power systems. The main reason for the decreased interest in real-time simulators solutions built on the basis of PC is the simulation instability. The instability of the simulation is due to not keeping with accurate results when using small integration steps and loss of accuracy or loss of stability when using large integration steps. The second obstacle was due to the lack of a method for integrating differential equations, which gives accurate results with a large integration step. This is the scientific problem that is solved in this paper. A new solution is the use of a new method for integrating differential equations based on average voltage in the integration step (AVIS). This paper shows that the applied AVIS method, compared to other methods proposed in the literature (in the context of real-time simulators), allows to maintain simulation stability and accurate results with the use of large integration steps. A new (in the context of the application of the AVIS method) mathematical model of a power transformer is described in detail, taking into account the nonlinearity of the magnetization characteristics. This model, together with the new doubly-fed induction machine model (described in the authors’ previous article), was implemented in PC-based hardware. In this paper, we present the results of research on the operation states of such a developed real-time simulator over a long period (one week). In this way, the effectiveness of the operation of the real-time simulator proposed in the paper was proved.

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Section: Introductionmentioning

confidence: 99%

The Use of a Real-Time Simulator for Analysis of Power Grid Operation States with a Wind Turbine

Kłosowski

Cieślik

2021

Energies

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“…O padrão senoidal indica que a dissipação de potência varia ciclicamente ao longo do tempo, na qual a variação está associada à natureza periódica de sua operação, sendo frequentemente observado em sistemas que passam por ciclos de atividade e repouso, ou cuja carga varia periodicamente (Martinez-Velasco, 2015).…”

Section: Fonte: Autoria Própria (2023)unclassified

Análise Experimental De Um Aquecedor Térmico De Parede Tipo Radiador

Antonini Alves

2023

Anais Do Congresso Internacional De Engenharia Mecânica E Industrial

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RESUMO: O presente trabalho consiste na análise experimental do desempenho térmico de um aquecedor de parede tipo radiador, operando entre 40ºC e 60ºC, em termos de distribuição de temperaturas. Os testes experimentais foram conduzidos em ambiente controlado em um protótipo que utiliza óleo como fluido de trabalho. Para a análise, foram empregados termopares para medir as temperaturas superficiais, enquanto um sistema foi implementado para medir a corrente, tensão e potência consumida pelo radiador, bem como parâmetros ambientais, como temperatura ambiente e umidade relativa. A análise estatística dos resultados possibilitou avaliar o desempenho térmico do radiador de parede, demonstrando um comportamento coerente com o esperado pela literatura. Esses dados são fundamentais para o desenvolvimento de soluções mais eficientes e sustentáveis de aquecimento, contribuindo para a redução do consumo de energia e dos impactos ambientais. Dessa forma, a busca por soluções que aliem alta eficiência energética e conforto térmico é essencial para a concepção de sistemas de aquecimento mais sustentáveis e adequados às necessidades dos usuários.

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“…Finally, the Norton equivalent matrix in the xy-coordinates is derived. Unlike the traditional time-domain EMT analysis [29], [30], the fast time-varying signals are converted into slow timevarying dynamic phasors by the SFA. Low frequency dynamic phasors imply the feasibility of using larger integration time steps.…”

Section: R E a Dmentioning

confidence: 99%

“…In order to resolve the second challenge, i.e., avoid the numerical oscillations caused by switching and improve the simulation efficiency, the Thévenin equivalent model, represented by SFM, is used for each sub-module. Since the equivalent model has no switch inside, naturally there is no risk of numerical oscillation [29], [30].…”

Section: A Equivalent Models Of Half-bridge and Full Bridge Sub-modulesmentioning

confidence: 99%

Shifted Frequency Modeling of Hybrid Modular Multilevel Converters for Simulation of MTDC Grid

Shu

Dinavahi

Xie

2018

IEEE Trans. Power Delivery

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When investigating voltage and current stresses in critical main circuit components during faults of the converter, a detailed equivalent model capable of representing the balancing control strategies of the capacitor voltages on the submodule level, along with blocking and delocking, is always necessary. Among previously proposed equivalent models of the modular multilevel converter (MMC), only submodule averaged models (SAMs) can capture interested inner dynamics inside each arm. However, the simulation accuracy of SAMs is not always satisfactory, especially when the time step is larger than 10 µs. In order to further improve the simulation accuracy with guaranteed simulation efficiency, the shifted frequency modeling of the half-and full-bridge hybrid MMC is proposed in this paper. Therein, each submodule is represented by Thévenin equivalents derived by submodule dynamic phasors. The arm of the MMC is represented by Norton equivalents to guarantee the efficiency, considering both normal and dc-blocking conditions. The effectiveness of the proposed model in terms of accuracy and efficiency is validated by simulating an MMC-based HVdc transmission.

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Solution Techniques for Electromagnetic Transient Analysis

Cited by 3 publications

References 38 publications

The Use of a Real-Time Simulator for Analysis of Power Grid Operation States with a Wind Turbine

The Use of a Real-Time Simulator for Analysis of Power Grid Operation States with a Wind Turbine

Análise Experimental De Um Aquecedor Térmico De Parede Tipo Radiador

Shifted Frequency Modeling of Hybrid Modular Multilevel Converters for Simulation of MTDC Grid

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