Graduate Seminar with Qian Zhang: Primary Frequency Support through North American Continental HVDC Interconnections with VSC-MTDC Systems

When

March 10, 2020    
1:10 pm - 2:00 pm

Where

3043 ECpE Building Addition
Coover Hall, Ames, Iowa, 50011

Event Type

Speaker: Qian Zhang, ECpE Graduate Student

Advisor: James McCalley, Venkataramana Ajjarapu

Title: Primary Frequency Support through North American Continental HVDC Interconnections with VSC-MTDC Systems

Abstract: This presentation proposes a frequency control strategy for voltage source converter based multi-terminal HVDC systems (VSC-MTDC) to facilitate the exchange of primary frequency reserves among asynchronous AC systems, thus providing frequency support from each AC system to the others. The proposed frequency control utilizes a reference signal calculated from global measurements which reflects the overall frequency dynamics of all connected asynchronous AC systems. The proposed control outperforms the traditional frequency droop scheme in the literature by reducing impact on the DC voltage profile and improving frequency nadir. The robustness of the proposed control to communication latency and the sensitivity of frequency support to power limits are also investigated. The VSC-MTDC model and the proposed control are implemented in the commercial grade software PSS/E and thus is suitable to study largescale realistic systems and can be incorporated into the power system planning process at utilities and ISOs. The effectiveness of the proposed control is illustrated on a developed AC-MTDC test system and also on a large-scale realistic model combining the North American Western Interconnection (WI) and Eastern Interconnection (EI) with continental HVDC interconnections.

Bio: Qian Zhang received the B.S. degree in electrical engineering and automation from Beihang University, Beijing, China, in 2011, and the M.S.E.E degree from the University of Minnesota, Minneapolis, MN, USA, in 2013. From 2013 to 2015, she worked as a System Protection E.I.T. in the Power Delivery Services group of HDR Engineering Inc., Minneapolis, MN, USA. In summers of 2017 and 2018, she was a PhD Intern with the Electricity Infrastructure group of the Pacific Northwest National Laboratory (PNNL), Richland, WA, USA. She is currently pursuing the Ph.D. degree in the Department of Electrical and Computer Engineering at the Iowa State University, Ames, IA, USA. Her research interests include power system dynamics and stability, control of multi-terminal VSC-HVDC systems, and measurement based oscillation damping control.

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