Optimum time step size and maximum simulation time in EMTP-based programs

Siqueira, José Carlos Goulart de; Bonatto, Benedito Donizeti; Martí, José; Hollman, Jorge A.; Dommel, H.W.

doi:10.1109/pscc.2014.7038485

Cited by 10 publications

(13 citation statements)

References 8 publications

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“…In theory, it could be up to the Nyquist frequency, which is half of the shortest time constant, but this would be too close from an erroneous simulation. This guideline agrees with past recommendations found in the literature [23], [30]. Based on this rule, PM models can be even used to perform studies with harmonic content, provided that the greatest harmonic frequency is well represented by the simulation time step.…”

Section: Discussion and Guidelinessupporting

confidence: 86%

Phasor Modelling Approaches and Simulation Guidelines of Voltage-Source Converters in Grid-Integration Studies

Lacerda¹,

Prieto‐Araujo²,

Cheah-Mañé³

et al. 2021

Preprint

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This paper reviews Voltage-Source Converters (VSCs) EMT and Phasor models currently used to simulate converter-interfaced generation (CIG) and renewable energy resources integration to power systems. Several modelling guidelines and suitability analyses were provided based on a comprehensive comparative study among the models. Various studies were performed in a small system and a large system, modelled in Simulink. We address a gap related to the suitability of CIGs phasor models in studies where the boundary between electromagnetic and electromechanical transients overlap. An insightful analysis of the adequate simulation time step for each model and study is also provided, along with several simulation guidelines.

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Section: Discussion and Guidelinessupporting

confidence: 86%

Phasor Modelling Approaches and Simulation Guidelines of Voltage-Source Converters in Grid-Integration Studies

Lacerda¹,

Prieto‐Araujo²,

Cheah-Mañé³

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…In the range from 2 ms to 20 ms, the RMSE of the EMT results increases tremendously. This seems reasonable as in EMTP-based simulation it is well known that an appropriate accuracy is obtained only for simulation steps below 10% of the minimum cycle duration that is to be simulated [28]. This requires a simulation step below 2 ms for 50 Hz signals.…”

Section: Averaged Inverter Model With Controlsmentioning

confidence: 72%

“…A bandpass signal s(t) can be expressed as a baseband signal f (t) shifted by ω s (27). The Fourier transform S(ω) is given by (28).…”

Section: Transmission Linementioning

confidence: 99%

DPsim—Advancements in Power Electronics Modelling Using Shifted Frequency Analysis and in Real-Time Simulation Capability by Parallelization

2020

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Real-time simulation is an increasingly popular tool for product development and research in power systems. However, commercial simulators are still quite exclusive due to their costs and they face problems in bridging the gap between two common types of power system simulation, conventional phasor based, and electromagnetic transient simulation. This work describes recent improvements to the open source real-time simulator DPsim to address increasingly important use cases that involve power electronics that are connected to the electrical grid and increasing grid sizes. New power electronic models have been developed and integrated into the DPsim simulator together with techniques to decouple the system solution, which facilitate parallelization. The results show that the dynamic phasors in DPsim, which result from shifted frequency analysis, allow the user to combine the characteristics of conventional phasor and electromagnetic transient simulation. Besides, simulation speed up techniques that are known from the electromagnetic domain and new techniques, specific to dynamic phasors, significantly improve the performance. It demonstrates the advantages of dynamic phasor simulation for future power systems and the applicability of this concept to large scale scenarios.

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“…The length of a section in each case along with the simulation time steps are listed in Table 1. The simulation time step is chosen in such a way that it is 1/10th of the travel time of one section [31].…”

Section: Simulation Setup and Evaluation Methodsmentioning

confidence: 99%

Accurate Evaluation of Steady-State Sheath Voltage and Current in HVDC Cable Using Electromagnetic Transient Simulation

et al. 2019

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The current and voltage in High Voltage DC (HVDC) line is not pure DC but contain superimposed ripple components. The current ripple in core of HVDC cable magnetically induces a voltage in the sheath, whereas the voltage ripple causes the flow of charging current from core to sheath. The knowledge of sheath voltage is necessary to ensure compliance with the specification of utility companies. In this work, we have reported that the models available in commercial Electromagnetic Transient (EMT) simulation software erroneously introduce a DC bias in steady-state sheath voltage and sheath current. We have also demonstrated that by removing the DC bias accurate steady-state evaluation of sheath voltage and sheath current is possible. Additionally, we have analyzed the sheath voltage and currents in HVDC cable considering different cable lengths and sheath grounding schemes. It has been found that grounding the sheath at the terminal of HVDC cable can limit the sheath voltage to acceptable levels without causing substantial joule loss in the sheath.

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Optimum time step size and maximum simulation time in EMTP-based programs

Cited by 10 publications

References 8 publications

Phasor Modelling Approaches and Simulation Guidelines of Voltage-Source Converters in Grid-Integration Studies

Phasor Modelling Approaches and Simulation Guidelines of Voltage-Source Converters in Grid-Integration Studies

DPsim—Advancements in Power Electronics Modelling Using Shifted Frequency Analysis and in Real-Time Simulation Capability by Parallelization

Accurate Evaluation of Steady-State Sheath Voltage and Current in HVDC Cable Using Electromagnetic Transient Simulation

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