| Title |
DC-link Voltage Control of HVDC for Offshore Wind Farm using Improved De-loading Method |
| Authors |
허재선(Huh, Jae-Sun) ; 문원식(Moon, Won-Sik) ; 박상인(Park, Sang-In) ; 김두희(Kim, Doo-Hee) ; 김재철(Kim, Jae-Chul) |
| DOI |
https://doi.org/10.5370/KIEE.2015.64.3.399 |
| Keywords |
Low Voltage Ride Through(LVRT) ; High Voltage Direct Current(HVDC) ; Offshore Wind Farm ; DC-link Voltage Control ; De-loading Method |
| Abstract |
This paper presents the DC voltage control method in DC link of High Voltage Direct Current(HVDC) for an offshore wind farm in Low Voltage Ride Through(LVRT) situation. Wind generators in an offshore wind farm are connected to onshore network via HVDC transmission. Due to LVRT control of grid side inverter in HVDC, power imbalancing in DC link is generated and this consequentially causes rising of DC voltage. A de-loading scheme is one of the method to protect the wind power system DC link capacitors from over voltage. But the flaw of this method is slow control response time and that it needs long recovery time to pre-fault condition after fault clear. Thus, this paper proposes improved de-loading method and we analyze control performance for DC voltage in LVRT control of HVDC for an offshore wind farm. |