Design and implementation of perturbation observer-based robust passivity-based control for VSC-MTDC systems considering offshore wind power integration

Sang, Yiyan, Yang, Bo, Yao, Wei and Jiang, Lin ORCID: 0000-0001-6531-2791 (2018) Design and implementation of perturbation observer-based robust passivity-based control for VSC-MTDC systems considering offshore wind power integration IET GENERATION TRANSMISSION & DISTRIBUTION, 12 (10). pp. 2415-2424. ISSN 1751-8687, 1751-8695

Text MTDC_PORPC.pdf - Author Accepted Manuscript Download (1MB)

Abstract

Voltage source converter-based multi-terminal high-voltage direct current (VSC-MTDC) systems are starting to be commissioned. However, concentrated integration of large-scale wind power demands stronger robustness against power fluctuation and system disturbances to increase the reliability of the whole system. This study proposes a perturbation observerbased robust passivity-based control (PORPC) for VSC-MTDC systems connected to an offshore wind farm to meet the demands. The aggregated effect of system nonlinearities, parameter uncertainties, unmodelled dynamics and external disturbances includes grid faults and time-varying wind power output is estimated by a linear perturbation observer and fully compensated by a passive controller, thus no accurate VSC-MTDC system model is required. PORPC attempts to regulate DC voltage and reactive power at the rectifier side, as well as active power and reactive power at the inverters side connected to an offshore wind farm. Besides, a DC-link voltage droop controller is introduced so as to provide immediate response to the grid unbalance situation. Moreover, a noticeable robustness against parameter uncertainties can be achieved as no accurate system model is needed. Case studies are carried out to compare the performance of PORPC to other typical approaches. Finally, a hardware-in-the-loop test is undertaken via dSPACE which validate its implementation feasibility.

Item Type:	Article
Uncontrolled Keywords:	observers, robust control, wind power plants, offshore installations, power generation faults, power grids, voltage control, reactive power control, electric current control, rectifying circuits, invertors, power generation control, perturbation observer-based robust passivity-based control, offshore wind power integration, renewable energy source, voltage source converter, multiterminal high-voltage direct current system, large-scale wind power demand, reliability, PORPC, offshore wind farm, grid fault, time-varying wind power output estimation, linear perturbation observer, passive controller, VSC-MTDC system model, reactive power regulation, DC voltage regulation, rectifier, DC-link voltage droop controller, hardware-in-the-loop test, dSPACE simulator
Depositing User:	Symplectic Admin
Date Deposited:	14 Nov 2018 16:37
Last Modified:	16 Jun 2026 05:53
DOI:	10.1049/iet-gtd.2017.1693
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3028862
Disclaimer:	The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate.