TY - GEN
T1 - DC-Link Energy Control in Voltage Droop Strategy of Multi-Terminal DC System for AC Grid Frequency Support
AU - Lee, Choongman
AU - Kim, Heejin
AU - Shim, Jae W.
AU - Hur, Kyeon
PY - 2019/12
Y1 - 2019/12
N2 - 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.
AB - 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.
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U2 - 10.1109/ICPES47639.2019.9105659
DO - 10.1109/ICPES47639.2019.9105659
M3 - Conference contribution
AN - SCOPUS:85086635110
T3 - 2019 9th International Conference on Power and Energy Systems, ICPES 2019
BT - 2019 9th International Conference on Power and Energy Systems, ICPES 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 9th International Conference on Power and Energy Systems, ICPES 2019
Y2 - 10 December 2019 through 12 December 2019
ER -