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- 저자 : Guo Ziye (검색결과 2 건)
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Design and Development of Superimposed Directional Comparison Protection Scheme
Guo Ziye,Crossley Peter A.,Li Haiyu 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
To achieve the UK Net Zero future by 2050, National Grid needs to integrate significantly more renewable generation into the power grid. This increases the level of harmonics, reduces system inertia and adversely affects the fault level and the performance of existing protection relays. One solution to the protection problem is the use of new types of protection that use the change in the voltage and current caused by the fault, often referred to as a superimposed or incremental based protection technique. This paper describes how a superimposed directional comparison protection scheme performed when applied to a reduced section of the full UK National Grid network and relates this to the operating performance of traditional protection. Tests are performed using the simulators DIgSILENT and RelaySimTest configured with different source levels, fault types, fault locations and fault resistances. Results show the superimposed based protection scheme achieves faster fault detection and tripping than conventional protection and is capable of detecting higher resistive faults on networks where the source capacities vary from strong to weak.
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Runan Guo,Ziye Zhang,Chong Lin,Yuming Chu,Yongmin Li 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.3
This paper considers the finite time state estimation problem of complex-valued bidirectional associativememory (BAM) neutral-type neural networks with time-varying delays. By resorting to the Lyapunov functionapproach, the Wirtinger inequality and the reciprocally convex approach, a delay-dependent criterion in terms ofLMIs is established to guarantee the finite-time boundedness of the error-state system for the addressed system. Meanwhile, an effective state estimator is designed to estimate the network states through the available outputmeasurements. Finally, a numerical example is presented to demonstrate the effectiveness of the proposed results.
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