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Transient voltage stresses in MMC-HVDC links-impulse analysis and novel proposals for synthetic laboratory generation

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High Voltage 2018年第2期3卷 115-125页

作者： Claudius Freye Simon Wenig Max Goertz thomas leibfried Frank Jenau Institute of High Voltage Engineering TU Dortmund University44227 DortmundGermany Institute of Electrical Energy Systems and High-Voltage Technology Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany

To evaluate and optimise insulation coordination concepts for state of the art high-voltage direct current(HVDC)transmission systems,appropriate test voltage shapes are required for laboratory imitation of occurring *** especially transient voltages in the monopolar modular multilevel converter(MMC)-HVDC links show an extensive deviation from commonly applied switching impulse shapes,this study focusses on the analysis of over-voltages subsequent to direct current pole to ground ***,novel methods for synthetic laboratory test voltage generation are *** on simulated transients occurring during fault scenarios in different symmetrical monopolar±320 kV MMC-HVDC schemes,curve fitting,and related analysis techniques are used in order to compare simulated over-voltages with standard test voltage ***,these techniques further allow the identification of novel relevant impulse ***,design considerations for the generation of non-standard impulses based on single-stage circuits are derived and *** synthetically generated voltages may,later on,provide the basis for future investigations on related dielectric effects caused by those non-normative over-voltages.

关键词： analysis insulation transient

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Time-domain Dynamic State Estimation for Unbalanced Three-phase Power Systems

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Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 446-454页

作者： Martin Pfeifer Felicitas Mueller Steven de Jongh Frederik Gielnik thomas leibfried Sören Hohmann Institute of Control Systems(IRS) KarlsruheGermany Institute of Electrical Energy Systems and High Voltage Technology(IEH)at the Karlsruhe Institute of Technology(KIT) 76131 KarlsruheGermany

In this paper,we present a time-domain dynamic state estimation for unbalanced three-phase power *** dynamic nature of the estimator stems from an explicit consideration of the electromagnetic dynamics of the network,i.e.,the dynamics of the electrical *** enables our approach to release the assumption of the network being in quasi-steady ***,based on the line dynamics,we derive a graphbased dynamic system *** handle the large number of interacting variables,we propose a port-Hamiltonian modeling *** on the port-Hamiltonian model,we then follow an observer-based approach to develop a dynamic *** estimator uses synchronized sampled value measurements to calculate asymptotic convergent estimates for the unknown bus voltages and *** design and implementation of the estimator are illustrated through the IEEE 33-bus *** simulations verify the estimator to produce asymptotic exact estimates,which are able to detect harmonic distortion and sub-second transients as arising from converterbased resources.

关键词： Dynamic state estimation power system harmonic observer port-Hamiltonian system static state estimation transient

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