DC-Link Energy Control in Voltage Droop Strategy of Multi-Terminal DC System for AC Grid Frequency Support

Choongman Lee, Heejin Kim, Jae W. Shim, Kyeon Hur

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents an inertia emulation control method with the voltage droop strategy for voltage-sourced converter (VSC) based multi-terminal DC (MTDC) system. In the voltage droop strategy that all VSCs of MTDC system participate in the DC voltage control, the electro-static energy in MTDC capacitors cannot be delivered to a specific terminal: This may become an issue when the MTDC interconnects asynchronous AC power systems and one of the AC systems needs an immediate support from the MTDC. The proposed method aims to deliver the DC-link energy to one of the AC systems. This methodology is performed by adjusting the DC voltage reference depending on the frequency of each connected AC system. Subsequently, it improves the frequency stability of AC grid by utilizing the DC-link energy in MTDC system. The efficacy of the proposed method is demonstrated through PSCAD/EMTDC simulation studies for three-terminal DC system of Jeju Island in South Korea.

Original languageEnglish
Title of host publication2019 9th International Conference on Power and Energy Systems, ICPES 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728126586
DOIs
Publication statusPublished - 2019 Dec
Event9th International Conference on Power and Energy Systems, ICPES 2019 - Perth, Australia
Duration: 2019 Dec 102019 Dec 12

Publication series

Name2019 9th International Conference on Power and Energy Systems, ICPES 2019

Conference

Conference9th International Conference on Power and Energy Systems, ICPES 2019
CountryAustralia
CityPerth
Period19/12/1019/12/12

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Renewable Energy, Sustainability and the Environment
  • Electrical and Electronic Engineering
  • Control and Optimization

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  • Cite this

    Lee, C., Kim, H., Shim, J. W., & Hur, K. (2019). DC-Link Energy Control in Voltage Droop Strategy of Multi-Terminal DC System for AC Grid Frequency Support. In 2019 9th International Conference on Power and Energy Systems, ICPES 2019 [9105659] (2019 9th International Conference on Power and Energy Systems, ICPES 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICPES47639.2019.9105659