Latency techniques for time-domain power system transients simulation

Moreira, Fernando Augusto; Martí, José

doi:10.1109/pes.2005.1489363

Cited by 4 publications

(8 citation statements)

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“…In order to investigate the fast transient of DC grids, there are three major algorithms to perform the parallel computation, which can be extended to multi-rate simulations, the Ideal Transform Interface (ITI) [23], the Transmission Line Interface (TLI) [7,24]and the Thevenin equivalent interface [25,26].…”

Section: Literature Surveymentioning

confidence: 99%

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Systematic evaluation for multi-rate simulation of DC grids

Qin

Liang

Zhou

et al. 2017

International Journal of Electrical Power & Energy Systems

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With wide applications of power electronic devices in modern power systems, simulation using traditional electromechanical and electromagnetic tools suffers low speed and imprecision. Multi-rate methods can enhance efficiency of simulation by decreasing the scale of systems in small time-steps. However, the existing traditional methods for multi-rate simulation suffer the problems of instability and simulation errors. These have hindered the application of multi-rate simulation in power industry. Therefore theoretical evaluation on different multi-rate simulation methods is crucial to understand the feasibility and limitation of the methods, and to contribute to overcome the drawbacks of the traditional methods. In this paper, the multi-rate simulation performance based on two traditional technologies and a Modified Thevenin Interface are evaluated to provide an overall feasibility of multi-rate algorithms in the power simulation. The Modified Thevenin Interface is proposed to overcome the drawbacks in synchronization. Three theorems are proposed and proved for theoretically analyzing the stability of the simulation methods. Error analyses of the multi-rate methods are performed to identify the relationships between errors and simulation conditions. Besides, the accuracy and efficiency performance in a practical project of VSC-MTDC shows the feasibility and necessity by using multi-rate simulation. Through the theoretical analysis, the issues of stability and accuracy of multi-rate simulation for the DC grids have been better understood, based on which an improved simulation algorithm has been proposed to overcome these issues. Long-term system dynamics of large-scale systems containing DC grids and fast transients of HVDC converters can be investigated simultaneously with high speed and sufficient accuracy. KeywordsElectromagnetic To view all the submission files, including those not included in the PDF, click on the manuscript title on your EVISE Homepage, then click 'Download zip file'. Journal of Advanced Research Cover Letter Manuscript title:Systematic Evaluation for Multi-Rate Simulation of DC Grids Short running title:Evaluation for Multi-Rate Simulation What does the current manuscript add to the existing knowledge? (Research Highlights)1-Three theorems for the stability of three typical multi-rate simulation algorithms have been proposed and proved.2-The error of three typical multi-rate simulation algorithms has been modelled. 3-The backward synchronization for the Thevenin equivalent interface has beenproposed to overcome the challenge of synchronization.4-Three typical multi-rate simulation algorithms have been compared to illustrate that the modified Thevenin equivalent interface is the most stable and accurate.5-The multi-rate simulation algorithm has been used in the studies of DC grids, which achieve the great improvement of the simulation speed.We affirm that the submission represents original work that has not been published previously and is not currently being considered or submitted...

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Section: Literature Surveymentioning

confidence: 99%

“…V f , V s Z s , and Z f represent Thevenin equivalent circuits of the interface [25]. The Thevenin equivalent circuit method is commonly used in single rate simulation, where the interface equations are:…”

Section: Modified Thevenin Equivalent Interface (Mti)mentioning

confidence: 99%

Systematic evaluation for multi-rate simulation of DC grids

Qin

Liang

Zhou

et al. 2017

International Journal of Electrical Power & Energy Systems

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“…The Latency concept 3 , introduced by Martí and Linares in [55] and by Moreira in [56], aims at exploiting the use of different time steps in different subnetworks. By using larger time steps for slow subnetworks and small time steps for fast subnetworks considerable computational savings can be achieved without sacrifying accuracy.…”

Section: The Latency Conceptmentioning

confidence: 99%

“…By using larger time steps for slow subnetworks and small time steps for fast subnetworks considerable computational savings can be achieved without sacrifying accuracy. The Latency concept [20], [56] depends for its successful implementation on the accurate identification of areas with significantly different time constants. This is not by any means an easy task, and as quoted in [56] "it is one of the limitations of the Latency method...".…”

Section: The Latency Conceptmentioning

confidence: 99%

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Step-by-Step Eigenvalue Analysis With EMTP discrete-time Solutions

Hollman

Martí

2010

IEEE Trans. Power Syst.

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The present work introduces a methodology to obtain a discrete time state space representation of an electrical network using the nodal [G] matrix of the Electromagnetic Transients Program (EMTP) solution. This is the first time the connection between the EMTP nodal analysis solution and a corresponding state-space formulation is presented. Compared to conventional state space solutions, the nodal EMTP solution is computationally much more efficient. Compared to the phasor solutions used in transient stability analysis, the proposed approach captures a much wider range of eigenvalues and system operating states. A fundamental advantage of extracting the system eigenvalues directly from the EMTP solution is the ability of the EMTP to follow the characteristics of nonlinearities. The system's trajectory can be accurately traced and the calculated eigenvalues and eigenvectors correctly represent the system's instantaneous dynamics. In addition, the algorithm can be used as a tool to identify network partitioning subsystems suitable for real-time hybrid power system simulator environments, including the implementation of multi-time scale solutions. The proposed technique can be implemented as an extension to any EMTPbased simulator. Within our UBC research group, it is aimed at extending the capabilities of our real-time PC-cluster Object Virtual Network Integrator (OVNI) simulator.

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Multi-Rate Real-Time Simulation Method Based on the Norton Equivalent

Zhu¹,

Jin²

2020

Preprint

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For the problem of poor accuracy of the existing multi-rate simulation methods, this paper proposes a multi rate real-time simulation method based on the Norton equivalent, compared with multi-rate simulation method based on the ideal source equivalent. After the Norton equivalence of the fast subsystem and the slow subsystem, they are obtained simultaneously at the junction nodes. In order to reduce the amount of simulation calculation, the Norton equivalent circuit is obtained by incremental calculation. The data interface between the fast subsystem and the slow subsystem is realized by extrapolation method. For ensuring the real-time performance of the simulation, the method that the slow subsystem calculates ahead of the fast subsystem is given for the slow subsystem with a large amount of calculation. Finally, the AC/DC hybrid power system was simulated on the real-time simulation platform (FRTDS), and the simulation results were compared with the single-rate simulation, which verified the correctness and accuracy of the method.

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Latency techniques for time-domain power system transients simulation

Cited by 4 publications

References 0 publications

Systematic evaluation for multi-rate simulation of DC grids

Systematic evaluation for multi-rate simulation of DC grids

Step-by-Step Eigenvalue Analysis With EMTP discrete-time Solutions

Multi-Rate Real-Time Simulation Method Based on the Norton Equivalent

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