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.
p. 107387.
Text
Perturbation Observer-Based Nonlinear Control of VSC-MTDC Systems.pdf - Author Accepted Manuscript Download (8MB) | Preview |
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 |
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Uncontrolled Keywords: | VSC-MTDC, Offshore wind farms, Feedback linearization control, Robustness, Fault ride-through, High gain observer, Output feedback control |
Divisions: | Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science |
Depositing User: | Symplectic Admin |
Date Deposited: | 02 Aug 2021 10:20 |
Last Modified: | 18 Jan 2023 21:35 |
DOI: | 10.1016/j.ijepes.2021.107387 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3131230 |