Three-terminal Hybrid HVDC Transmissions Control Strategies for Bundled Wind-thermal Power Plants
Wu Jiahui*, a, Wang Haiyuna, Wang Weiqinga, Zhang Qiangb
a College of Electrical Engineering, Xingjiang University, Urumqi, XinJiang, PR China
b Electric Power Research Institute, Urumqi, XinJiang, PR China
This paper evaluates application feasibility of a Hybrid Multi-terminal HVDC system and wind-thermal-bundled plants simulated in DIgSLIENT PowerFactory environment. The proposed hybrid MTDC system consists of two line-communicated converters (LCC), which are connected to both wind farms and thermal power plants, and one voltage source converter (VSC) at the grid side. Control strategies for each converter are designed to handle this system under different disturbance conditions. Simulation results show that the wind power fluctuation can be compensated by the thermal-generated power. Results demonstrate the effectiveness of the proposed control strategies of the hybrid MTDC system compared to a conventional MTDC system. The proposed scheme combines advantages of both LCC and VSC HVDC systems and provides a new way to transmit wind power over long distances to the main grid.
Keywords: Control strategy, Converter station, Hybrid HVDC, LCC-HVDC, VSC-HVDC, Wind-thermal-bundled power system.
open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
* Address correspondence to this author at the Department of College of Electrical Engineering, Xinjiang University, Urumqi, XinJiang, China; Tel: +86-18399698695; E-mail: firstname.lastname@example.org.