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Energies 2017, 10(8), 1092; https://doi.org/10.3390/en10081092

Nonlinear Synergetic Governor Controllers for Steam Turbine Generators to Enhance Power System Stability

1
State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
2
College of Electrical Engineering & New Energy, China Three Gorges University, 8 College Road, Yichang 443002, China
*
Author to whom correspondence should be addressed.
Received: 22 June 2017 / Revised: 17 July 2017 / Accepted: 24 July 2017 / Published: 26 July 2017
(This article belongs to the Section Electrical Power and Energy System)
View Full-Text   |   Download PDF [3245 KB, uploaded 26 July 2017]   |  

Abstract

This paper proposes a decentralized nonlinear synergetic governor controller (NSGC) for turbine generators to enhance power system stability by using synergetic control theory and the feedback linearization technique. The precise feedback linearization model of a turbine-generator with a steam valve control is obtained, at first, by using a feedback linearization technique. Then based on this model, a manifold is defined as a linear combination of the deviation of the rotor angle, speed deviation, and speed derivative. The control law of the proposed NSGC is deduced and the stability condition of the whole closed-loop system is subsequently analyzed. According to the requirement of the primary frequency regulation, an additional proportional integral (PI) controller is designed to dynamically track the steady-state value of the rotor angle. Case studies are undertaken based on a single-machine infinite-bus system and the New England system, respectively. Simulation results show that the proposed NSGC can suppress the power oscillations and improve transient stability more effectively in comparison with the conventional proportional-integral-derivative (PID) governor controller. Moreover, the proposed NSGC is robust to the variations of the system operating conditions. View Full-Text
Keywords: turbine-generator; governor controller; steam-valve control; feedback linearization; synergetic control; manifold turbine-generator; governor controller; steam-valve control; feedback linearization; synergetic control; manifold
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Ju, X.; Zhao, P.; Sun, H.; Yao, W.; Wen, J. Nonlinear Synergetic Governor Controllers for Steam Turbine Generators to Enhance Power System Stability. Energies 2017, 10, 1092.

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