Coordinated frequency regulation among asynchronous AC grids with an MTDC system

Xiao, Huangqing; Sun, Kaiqi; Pan, Jiuping; Xiao, Liang; Gan, Chun; Liu, Yilu

doi:10.1016/j.ijepes.2020.106604

Coordinated frequency regulation among asynchronous AC grids with an MTDC system

Journal Article · Sun Nov 01 00:00:00 EDT 2020 · International Journal of Electrical Power and Energy Systems

DOI:https://doi.org/10.1016/j.ijepes.2020.106604· OSTI ID:1831622

Xiao, Huangqing ^[1]; Sun, Kaiqi ^[1]; Pan, Jiuping ^[2]; Xiao, Liang ^[3]; Gan, Chun ^[4]; Liu, Yilu ^[5]

Univ. of Tennessee, Knoxville, TN (United States)
Hitachi-ABB Power Grids, Raleigh, NC (United States)
China Southern Power Grid Company, Guangzhou (China)
Huazhong Univ. of Science and Technology, Wuhan (China)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

With the increasing penetration level of renewable power, the power systems’ inertias are decreasing. To ensure that the frequency is above the threshold of the under frequency load shedding, one effective way is to share the spinning reserves among asynchronous AC grids through HVDC systems. In this paper, a coordinated frequency regulation scheme that enables spinning reserves sharing is proposed for such hybrid AC/DC grids. This scheme is a communication-free method that consists of the droop control, the inertia emulation control and the frequency safety control. The combined response of the three controls can increase not only the frequency nadir but also the settled frequency of the disturbed grid. In addition, the hysteresis comparators and the power injection limits are adopted in the frequency regulation scheme to reduce the coupling effect among AC grids. Thus, under small and harmless disturbance, the frequency regulation scheme will be inactive; the disturbance in strong AC grids would not affect the weak AC systems. The frequency regulation scheme coordinates well with the automatic generation control of the grids. Furthermore, the feasibility and effectiveness of the proposed frequency regulation scheme are verified through simulation studies.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1831622

Alternate ID(s):: OSTI ID: 2476559

Journal Information:: International Journal of Electrical Power and Energy Systems, Journal Name: International Journal of Electrical Power and Energy Systems Journal Issue: A Vol. 126; ISSN 0142-0615

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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24 POWER TRANSMISSION AND DISTRIBUTION
Asynchronous AC grids
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Coordinated frequency regulation among asynchronous AC grids with an MTDC system

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