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RISS 인기검색어
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- 저자 : ShiJie Wen (검색결과 6 건)
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A Novel Energy Storage System based on Flywheel for Improving Power System Stability
Wu, Jinbo,Wen, Jinyu,Sun, Haishun,Cheng, Shijie The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.4
In this paper, a novel flywheel energy storage device, called the flexible power conditioner, which integrates both the characteristics of the flywheel energy storage and the doubly-fed induction machine, is proposed to improve power system stability. A prototype is developed and its principle, composition, and design are described in detail. The control system is investigated and the operating characteristics are analyzed. The test results based on the prototype are presented and evaluated. The test results illustrate that the prototype meets the design requirement on power regulation and starting, and provides a cost-effective and effective means to improve power system stability.
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SRAM Interleaving Distance Selection With a Soft Error Failure Model
Sanghyeon Baeg,ShiJie Wen,Wong, R. IEEE 2009 IEEE transactions on nuclear science Vol.56 No.4
<P>The significance of multiple cell upsets (MCUs) is revealed by sharing the soft-error test results in three major technologies, 90 nm, 65 nm, and 45 nm. The effectiveness of single-bit error correction (SEC) codes can be maximized in mitigating MCU errors when used together with the interleaving structure in memory designs. The model proposed in this paper provides failure probability to probabilistically demonstrate the benefits of various interleaving scheme selections for the memories with SEC. Grouped events such as MCU are taken into account in the proposed model by using the compound Poisson process. As a result of the proposed model, designers can perform predictive analysis of their design choices of interleaving schemes. The model successfully showed the difference in failure probability for different choices of interleaving schemes. The model behaved as the upper bound for failure probability when compared to the neutron test data with the 45-nm static-random-access memory (SRAM) design.</P>
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Application of Nonlinear PID Controller in Superconducting Magnetic Energy Storage
Xiaotao Peng,Shijie Cheng,Jinyu Wen 대한전기학회 2005 International Journal of Control, Automation, and Vol.3 No.2
As a new control strategy, the Nonlinear PID (NLPTD) controller has been introduced successfully in power systems. The controller is free of planting model groundwork during the design procedure and is therefore able to be achieved quite simply. In this paper, a nonlinear PID controller used for a superconducting magnetic energy storage (SMES) unit connected to a power system is proposed. The purpose of designing such a controller is to improve the stability of the power system in a relatively wide operation range. The design procedure takes into account the active and reactive power cooperative control scheme as well as the simple structure so as to be more apt to practical utilization. Simulation is carried out to investigate the performance of the proposed controller in a high order nonlinear power system model under the MATLAB environment. The results show satisfactory performance and good robustness of the controller. The feasibility of the controller is testified as well.
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A Novel Energy Storage System based on Flywheel for Improving Power System Stability
Jinbo Wu,Jinyu Wen,Haishun Sun,Shijie Cheng 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.4
In this paper, a novel flywheel energy storage device, called the flexible power conditioner, which integrates both the characteristics of the flywheel energy storage and the doubly-fed induction machine, is proposed to improve power system stability. A prototype is developed and its principle, composition, and design are described in detail. The control system is investigated and the operating characteristics are analyzed. The test results based on the prototype are presented and evaluated. The test results illustrate that the prototype meets the design requirement on power regulation and starting, and provides a cost-effective and effective means to improve power system stability.
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Chaofeng Li,Shihua Zhou,Shijie Jiang,Hexing Yu,Bang-chun Wen 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
The stability of periodic motion of a rotor-bearing system with two unbalanced disks is analyzed based on a multi-degree of freedom(M-DOF) finite element model. Nonlinear effects of supporting oil-film and inertia distributions as well as shearing effect are taken intoaccount. Focusing on the more realistic FE method to study the stability of nonlinear rotor-bearing system with the influence of the eccentricityphase, the stability calculation of the M-DOF FE model is done by using the combination of Shooting method and Newmarkmethod. Experiments with a rotor-bearing test rig (two disks on a shaft with two bearings) are then performed and results are presented. Itis found that typical instability characteristic is successfully produced. Through comparisons between calculated results and measurements,it is shown that the combination of Shooting method and Newmark method in studying the M-DOF rotor-bearing system is useful,especially for the complex rotor-bearing system. In addition, altering eccentricity phase of the two disks can significantly influence instabilitytype and speed. When the two disks are out of phase, the occurring of oil whip is restrained effectively. It is suggested that a carefulexamination should be made in modeling more complex non-linear rotor-bearing system.
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Application of Nonlinear PID Controller in Superconducting Magnetic Energy Storage
Peng Xiaotao,Cheng Shijie,Wen Jinyu Institute of Control 2005 International Journal of Control, Automation, and Vol.3 No.S
As a new control strategy, the Nonlinear PID (NLPID) controller has been introduced successfully in power systems. The controller is free of planting model groundwork during the design procedure and is therefore able to be achieved quite simply. In this paper, a nonlinear PID controller used for a superconducting magnetic energy storage (SMES) unit connected to a power system is proposed. The purpose of designing such a controller is to improve the stability of the power system in a relatively wide operation range. The design procedure takes into account the active and reactive power cooperative control scheme as well as the simple structure so as to be more apt to practical utilization. Simulation is carried out to investigate the performance of the proposed controller in a high order nonlinear power system model under the. MATLAB environment. The results show satisfactory performance and good robustness of the controller. The feasibility of the controller is testified as well.
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