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Diyi Chen

Bio: Diyi Chen is an academic researcher from Northwest A&F University. The author has contributed to research in topics: Nonlinear system & Chaotic. The author has an hindex of 30, co-authored 154 publications receiving 2936 citations. Previous affiliations of Diyi Chen include Chinese Ministry of Education & Curtin University.


Papers
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Journal ArticleDOI
TL;DR: This paper investigates the chaos control of a class of fractional-order chaotic systems via sliding mode through the derived sliding mode control law, and guarantees asymptotical stability of the uncertain fractionsal- order chaotic systems in the presence of an external disturbance.
Abstract: This paper investigates the chaos control of a class of fractional-order chaotic systems via sliding mode. First, the sliding mode control law is derived to make the states of the fractional-order chaotic systems asymptotically stable. Second, the designed control scheme guarantees asymptotical stability of the uncertain fractional-order chaotic systems in the presence of an external disturbance. Finally, simulation results are given to demonstrate the effectiveness of the proposed sliding mode control method.

173 citations

Journal ArticleDOI
TL;DR: In this paper, a novel nonlinear fractional-order mathematical model was established to study the stability of a hydro-turbine-generator unit in further depth, and the effect of the fractional order damping force on bifurcation points, the orbit of centroid of the rotor, the power and the frequency of rotor were analyzed.
Abstract: In order to study the stability of a hydro-turbine-generator unit in further depth, we establish a novel nonlinear fractional-order mathematical model considering a fractional-order damping force, a fractional-order oil-film force, an asymmetric magnetic pull and a hydraulic-asymmetric force. Furthermore, the nonlinear dynamics of the above fractional-order hydro-turbine-generator unit system with six typical fractional orders are studied in detail. Based on these, we analyze the effect of the fractional-order $$\alpha $$ on bifurcation points, the orbit of centroid of the rotor, the power and the frequency of the rotor. Fortunately, some variable laws are found from numerical simulation results. Finally, all of these results have enriched the dynamical behaviors of a hydro-turbine-generator system.

134 citations

Journal ArticleDOI
TL;DR: The feasibility of the pumped storage station model in integrating the hybrid power system under steady and fault scenarios is shown and all the parameter’s interaction contributions are quantified with the extended Fourier amplitude sensitivity text method.

132 citations

Journal ArticleDOI
TL;DR: A novel T–S fuzzy model pining controller with minimum control nodes is designed and numerical simulations are agreement with theoretical analysis, which both confirm that the correctness of the presented theory is correct.

127 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed a universal dynamic mathematical model of the multi-hydro-turbine governing system, which is fitted into the theoretical framework of the generalized Hamiltonian system, utilizing the method of orthogonal decomposition.

113 citations


Cited by
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Journal ArticleDOI

[...]

08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Book ChapterDOI
01 Jan 2015

3,828 citations

Journal ArticleDOI
TL;DR: An attempt has been made to review the applications of fuzzy logic based models in renewable energy systems namely solar, wind, bio-energy, micro-grid and hybrid applications and indicates that fuzzy based models provide realistic estimates.
Abstract: In recent years, with the advent of globalization, the world is witnessing a steep rise in its energy consumption. The world is transforming itself into an industrial and knowledge society from an agricultural one which in turn makes the growth, energy intensive resulting in emissions. Energy modeling and energy planning is vital for the future economic prosperity and environmental security. Soft computing techniques such as fuzzy logic, neural networks, genetic algorithms are being adopted in energy modeling to precisely map the energy systems. In this paper, an attempt has been made to review the applications of fuzzy logic based models in renewable energy systems namely solar, wind, bio-energy, micro-grid and hybrid applications. It is found that fuzzy based models are extensively used in recent years for site assessment, for installing of photovoltaic/wind farms, power point tracking in solar photovoltaic/wind, optimization among conflicting criteria. The review indicates that fuzzy based models provide realistic estimates.

411 citations

Proceedings Article
01 Jan 2004
TL;DR: In this paper, a SiGe amplifier with on-chip matching network spanning 3-10 GHz was presented, achieving 21dB peak gain, 2.5dB noise figure, and -1dBm input IP3 at 5 GHz, with a 10-mA bias current.
Abstract: Reactive matching is extended to wide bandwidths using the impedance property of LC-ladder filters. In this paper, we present a systematic method to design wideband low-noise amplifiers. An SiGe amplifier with on-chip matching network spanning 3-10 GHz delivers 21-dB peak gain, 2.5-dB noise figure, and -1-dBm input IP3 at 5 GHz, with a 10-mA bias current.

342 citations

Journal ArticleDOI
TL;DR: In this article , the authors summarized some of the scientific works presented in the Sustainable Energy and Environmental Protection (SEEP) conference-held at the University of the West of Scotland, UK, 2018.
Abstract: The current editorial summarized some of the scientific works presented in the Sustainable Energy and Environmental Protection (SEEP) conference-held at the University of the West of Scotland, UK, 2018. The selected work was directly related to the scope of the Renewable, Sustainable Energy Reviews (RSER) journal. During the conference activities, experts from all around the world in the subjects of: renewable energy, climate change, optimization, and economics presented and discussed the progress made in renewable energy sources, as well as the new strategies for protecting the environment from the hazards connected with fossil fuel utilization. The methods presented in the conference focused on several directions: the development of efficient energy conversion systems with low/no environmental impacts; the suggested policies to widespread renewable energies; the restriction in the emission of greenhouse gases, and the recent progresses in CO2 capture. This editorial focused on the renewable energy developments and their positive effect on the climate change, and briefly summarized the accepted manuscripts in this issue.

291 citations