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SUMMARY Power system stabilizer (PSS) is widely used to damp low frequency oscillations that inherently exist in the interconnected power system and limit its transmission capacity and stability. This paper presents a novel nonlinear PSS based on synergetic control theory that has strong robustness and adaptability to external disturbances. Firstly, according to the control target of the proposed synergetic PSS (SPSS), the deviations of generator rotor speed and active power are used to combine a manifold. The control law of the SPSS is deduced based on the nonlinear model of synchronous generator using synergetic control theory subsequently. As all of the input signals of the SPSS are local measurements and independent of the parameters of the power transmission network, the decentralized control strategy can be achieved. Two case studies are undertaken on a single-machine infinite-bus power system and a three-machine six-bus power system, respectively. Simulation results demonstrate that the proposed SPSS can provide better damping performances than those of the conventional PSS under a wide range of operating conditions and disturbances. Moreover, the proposed SPSS is robust with respect to the variations and uncertainties of the system parameters. Copyright © 2013 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

ABSTRACT Reverse atom transfer radical copolymerization of styrene and butyl acrylate was successfully carried out in an emulsion system using ferric chloride (FeCl3·6H2O)/ethylene diamine tetraacetic acid as a catalytic system. The effects of surfactant types and initiators, the concentration of initiator, and the catalytic system were investigated, respectively. Emulsion was obtained at 80°C under the condition of [monomers]0/[initiator]0/[catalyst]0/[ligand]0= 200/1/4/2, monomers/water = 15:100 (w/w), and the emulsifier was 2 wt% versus water. Finally, copolymers were characterized by Fourier transform infrared spectroscopy spectroscopy, differential scanning calorimetry, and gel permeation chromatography. Controlled copolymerization was confirmed by the linear correlations between molecular weights and monomer conversion, and the relatively narrow molecular weight distributions ( Mw/ Mn ≤ 1.5). © 2013 Wiley Periodicals, Inc. Adv Polym Technol 2013, 32, 21364; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21364 [ABSTRACT FROM AUTHOR]