Abstract
This paper will look at dc cable transient modelling issues for voltage source converter (VSC) based high voltage direct current (HVDC) transmission systems,which is getting evermore admired for large-scale offshore wind power integration. A simple mathematical π-equivalent cable model is presented and explained. Themodel is compared to the detailed cable models with different degrees of accuracy found in PSCAD/EMTDC. The models are analyzed and tested using simulations ofdc fault conditions and energization. These studies are helpful for the protection system design of large-scale renewable energy power systems to realize a reliable multi-terminal dc transmission system for the future.
Highlights
HIGH voltage direct current (HVDC) is a competitive transmission option for large-scale renewable energy integration to distant utility grids [1], [2]
PSCAD/EMTDC model In PSCAD/EMTDC we find four models that are used for cable modelling
voltage source converter (VSC)-HVDC transmission systems are a new area primed by the potential development of multi-terminal offshore HVDC
Summary
HIGH voltage direct current (HVDC) is a competitive transmission option for large-scale renewable energy integration to distant utility grids [1], [2]. Today with further usage of HVDC due to the VSC and a large increase in HVDC connected WPP’s, this problem is again of relevance, how to carry out the simulation and design of the power transmission systems for HVDC links, including long submarine HVDC cables. Detailed mathematically calculated π-circuits equivalent are known to give relatively good simulation results for cable. Are inherently frequency dependent, and it is difficult to simulate the frequency dependent characteristics of a cabling system directly in time domain, for instance, by using the cable model of the EMTP and EMTDC program [5]. In the PSCAD/EMTDC program the two cable models, namely the Bergeron model and the frequency dependent model with a constant transformation, are included. This work will compare detailed mathematically calculated Pi-equivalent models to the PSCAD/EMTDC cable models. A conclusive part of the work covers further discussion of the results, a summary of the main findings and proposals for future work on the field
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