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Energies 2017, 10(8), 1082; doi:10.3390/en10081082

Nonlinear Observer-Based Robust Passive Control of Doubly-Fed Induction Generators for Power System Stability Enhancement via Energy Reshaping

School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217, China
Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, China
Author to whom correspondence should be addressed.
Received: 20 May 2017 / Revised: 18 July 2017 / Accepted: 21 July 2017 / Published: 25 July 2017
(This article belongs to the Special Issue Sustainable Energy Technologies)
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The large-scale penetration of wind power might lead to degradation of the power system stability due to its inherent feature of randomness. Hence, proper control designs which can effectively handle various uncertainties become very crucial. This paper designs a novel robust passive control (RPC) scheme of a doubly-fed induction generator (DFIG) for power system stability enhancement. The combinatorial effect of generator nonlinearities and parameter uncertainties, unmodelled dynamics, wind speed randomness, is aggregated into a perturbation, which is rapidly estimated by a nonlinear extended state observer (ESO) in real-time. Then, the perturbation estimate is fully compensated by a robust passive controller to realize a globally consistent control performance, in which the energy of the closed-loop system is carefully reshaped through output feedback passification, such that a considerable system damping can be injected to improve the transient responses of DFIG in various operation conditions of power systems. Six case studies are carried out while simulation results verify that RPC can rapidly stabilize the disturbed DFIG system much faster with less overshoot, as well as supress power oscillations more effectively compared to that of linear proportional-integral-derivative (PID) control and nonlinear feedback linearization control (FLC). View Full-Text
Keywords: robust passive control; nonlinear observer; stability enhancement; energy reshaping robust passive control; nonlinear observer; stability enhancement; energy reshaping

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Dong, J.; Li, S.; Wu, S.; He, T.; Yang, B.; Shu, H.; Yu, J. Nonlinear Observer-Based Robust Passive Control of Doubly-Fed Induction Generators for Power System Stability Enhancement via Energy Reshaping. Energies 2017, 10, 1082.

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