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access icon openaccess Dual-loop SFC scheme for BTB-VSC-HVDC interconnecting asynchronous AC grids

  • Author(s): Lingkang Zeng 1 ; Dahu Li 2 ; Wei Yao 1 ; Jianbo Sun 2 ; Jinyu Wen 1
    • View affiliations
  • Source: Volume 2019, Issue 16, March 2019, p. 1020 – 1026
    DOI:  10.1049/joe.2018.8528 , Online ISSN 2051-3305
This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 23/08/2018, Accepted 19/09/2018, Published 23/10/2018

This study proposes a dual-loop supplementary frequency control (SFC) scheme for back-to-back voltage source converter high-voltage DC (BTB-VSC-HVDC) interconnecting asynchronous AC grids, to provide frequency support for each other after a large disturbance. The proposed dual-loop SFC consists of the frequency-active power (f–P) loop and the frequency-reactive power (f–Q) loop. The former deployed on the P-loop of VSC-HVDC can provide frequency support for the disturbed grid during the primary frequency regulation and improve the steady-state characteristics of the frequency response, while the latter attached to the Q-loop of VSC-HVDC supports virtual inertia to ameliorate the transient characteristics of the frequency response. Simulation studies are conducted based on the equivalently simplified model of Southwest Power Grid and Hubei Power Grid interconnected by Chongqing-Hubei BTB-VSC-HVDC. Simulation results show that the proposed SFC scheme can effectively improve the transient and steady-state characteristics of the system frequency response under a wide range of operating condition.

Inspec keywords: HVDC power transmission; power system interconnection; reactive power control; power system transients; frequency control; voltage-source convertors; frequency response; HVDC power convertors; power transmission control; power grids

Other keywords: SFC; dual-loop SFC scheme; VSC; f–Q loop; frequency-active power loop; Chongqing-Hubei BTB-VSC-HVDC; frequency support; back-to-back voltage source converter high-voltage DC interconnecting asynchronous AC grids; Hubei Power Grid; f–P loop; P; BTB-VSC-HVDC interconnecting asynchronous AC grids; steady-state characteristics; system frequency response; P-loop; transient characteristics; dual-loop supplementary frequency control scheme; virtual inertia; primary frequency regulation; Southwest Power Grid; disturbed grid; frequency-reactive power loop

Subjects: Power system control; AC-DC power convertors (rectifiers); Frequency control; Power and energy control; Power system management, operation and economics; d.c. transmission; Control of electric power systems; DC-AC power convertors (invertors)

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