Analysis of integration of multi-terminal HVDC network to weak grids.

Givaki, Kamyab; Rahman, Md Habibur; Vozikis, Dimitrios; Giveki, Ashkan

Abstract

In this paper, the integration of multi-terminal HVDC systems to weak power grids is analysed under different grid strengths and control methods. In this paper, a modular multi-level converter based MTDC network is considered. The analysis showed the importance of voltage control of DC network. The voltage control of DC network needs to be performed from the converter station connected to the strongest AC network. Furthermore, the analysis shows that either droop or PI control can be used for controlling the DC voltage of the MTDC network connected to one or more weak grids. However, the droop control of DC voltage provides faster response compared to PI with larger steady state error. Finally, the analysis showed that the MMC-based MTDC is capable of ride-through unbalanced AC side faults even if the faults occur in a weak grid.

Citation

Givaki, K., Rahman, M. H., Vozikis, D., & Giveki, A. (2018, June). Analysis of integration of multi-terminal HVDC network to weak grids. Paper presented at The 14th IET International Conference on AC and DC Power Transmission (ACDC 2018)

• Presentation Conference Type: Conference Paper (unpublished)
• Conference Name: The 14th IET International Conference on AC and DC Power Transmission (ACDC 2018)
• Start Date: Jun 28, 2018
• End Date: Jun 30, 2018
• Acceptance Date: Mar 5, 2018
• Deposit Date: Jul 30, 2018
• Publicly Available Date: Jul 30, 2018
• Keywords: Multi-Terminal HVDC; Vector Current Control, Weak Grid, DC Voltage Control, Voltage Control, Modular Multi-Level, Convertor,
• Public URL: http://researchrepository.napier.ac.uk/Output/1139554