Perturbation observer-based nonlinear control of VSC-MTDC systems

Wang, Weiyu, Yin, Xin, Jiang, Lin ORCID: 0000-0001-6531-2791, Cao, Yijia and Li, Yong (2022) Perturbation observer-based nonlinear control of VSC-MTDC systems INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS, 134. 107387-. ISSN 0142-0615, 1879-3517

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Abstract

The voltage source converter based multi-terminal direct-current (VSC-MTDC) system is a promising technique to integrate multiple large offshore wind farms (OWF) and to share the power between multiple ac grids. The operation and control of VSC-MTDC systems could be affected by multiple uncertainties, e.g., the stochastic power generation of OWFs, nonlinearities of VSC-MTDC systems and unknown dynamics triggered by grid faults, which may result in poor dynamic performance and stability issues. In this paper, a perturbation observer-based nonlinear control (PONC) is proposed to improve the robustness of VSC-MTDC systems with OWFs. The perturbation observer is designed to estimate the lumped perturbation terms, which include all the system uncertainties, unknown dynamics and the external disturbances together with the state estimates. Based on the estimated perturbation and states, the output feedback linearization controllers are designed to compensate the impact of the lumped perturbation and to achieve robust tracking performance, without requiring the accurate system model. The effectiveness of PONC is verified by a 5-terminal VSC-MTDC system.

Item Type:	Article
Uncontrolled Keywords:	VSC-MTDC, Offshore wind farms, Feedback linearization control, Robustness, Fault ride-through, High gain observer, Output feedback control
Divisions:	Faculty of Science & Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User:	Symplectic Admin
Date Deposited:	02 Aug 2021 10:20
Last Modified:	16 Jun 2026 14:56
DOI:	10.1016/j.ijepes.2021.107387
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3131230
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