Medium voltage distribution systems of some countries are mostly noneffectively grounded systems, and most of the distribution automation systems do not have the function of locating the fault section for single phase...
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The principle of surface wave plasma discharge in a rectangular cavity is introduced and the distribution of the electromagnetic field within a rectangular waveguide is analysed. A novel structure of a slot antenna ar...
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The principle of surface wave plasma discharge in a rectangular cavity is introduced and the distribution of the electromagnetic field within a rectangular waveguide is analysed. A novel structure of a slot antenna array is presented. In comparison with the traditional slotantenna, it is shown that the designed slot antenna array can excite effectively the surface wave coupling into the chamber, and generate a stable large-area high-density plasma. These results are useful for exploring the optimized design of the slot-antenna for surface wave plasmas.
Commutation failure is one of the most common failures that may lead to serious consequences in high-voltage direct current (HVdc) systems. Superconducting fault current limiters (SFCLs) have been proved effective to ...
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In the context of complex network theory, the small-world network is famous for the small-world phenomenon, namely six degrees of separation. Different from its wide application in the social, physical and technologic...
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Wide-area protection system (WAPS) is widely studied for the purpose of improving the performance of conventional backup protection. In this paper, the system architecture of WAPS is proposed and its key technologies ...
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Wide-area protection system (WAPS) is widely studied for the purpose of improving the performance of conventional backup protection. In this paper, the system architecture of WAPS is proposed and its key technologies are discussed in view of engineering projects. So a mixed structurecentralized-distributed structure which is more suitable for WAPS in limited power grid region, is obtained based on the advantages of the centralized structure and distributed structure. Furthermore, regional distance protection algorithm was taken as an example to illustrate the functions of the constituent units. Faulted components can be detected based on multi-source imformation fuse in the algorithm. And the algorithm cannot only improved the selectivity, the rapidity, and the reliability of relaying protection but also has high fault tolerant capability. A simulation of 220 kV grid systems in Easter Hubei province showed the effectiveness of the wide-area protection system presented by this paper.
Plasma equilibrium has been calculated using an analytical method. The plasma profiles of the current density, safety factor, pressure and magnetic surface function are obtained. The analytical solution of the Grad–S...
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Plasma equilibrium has been calculated using an analytical method. The plasma profiles of the current density, safety factor, pressure and magnetic surface function are obtained. The analytical solution of the Grad–Shafranov（GS） equation is obtained by the variable separation method and compared with the computed results of the equilibrium fitting code EFIT.
To conquer problems of bandwidth bottleneck and high latency in chain-type wireless communication network for transmission line online monitoring, an optimal model and multi-object-based decision for hybrid hierarchic...
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Reports that optical-disk technology groups are developing standards for next-generation video players and recorders. Incorporation of a blue-laser diode; Competition of the proposed formats; Reqirement for a higher c...
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Reports that optical-disk technology groups are developing standards for next-generation video players and recorders. Incorporation of a blue-laser diode; Competition of the proposed formats; Reqirement for a higher capacity format.
This paper reports a cold atmospheric pressure DC-driven air plasma brush. Three stainless steel needles are symmetrically mounted on a slot shaped PVC slab to act as the elec- trodes. The brush driven by a direct cur...
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This paper reports a cold atmospheric pressure DC-driven air plasma brush. Three stainless steel needles are symmetrically mounted on a slot shaped PVC slab to act as the elec- trodes. The brush driven by a direct current （DC） power supply can generate an air plasma glow up to 30 mm wide with no inert gas addition and no air flow supplement. The plasma glow appears uniform no matter what kinds of material are processed. The measured current and the simulated current all show that each pulsed discharge including two peaks always oc- curs for different gaps between electrodes. Emission spectra measurement result shows that the obtained rotational temperatures are 300 K and the vibrational temperatures are 2250 K. Some reactive species are presented in the plasma glow, which suggest that the proposed plasma brush is beneficial to practical applications.
Minimum energy storage(ES)and spinning reserve(SR)for day-ahead power system scheduling with high wind power penetration is significant for system operations.A chance-constrained energy storage optimization model base...
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Minimum energy storage(ES)and spinning reserve(SR)for day-ahead power system scheduling with high wind power penetration is significant for system operations.A chance-constrained energy storage optimization model based on unit commitment and considering the stochastic nature of both the wind power and load demand is *** solve this proposed chance-constrained model,it is first converted into a deterministic-constrained model using p-efficient point theory.A single stochastic net load variable is developed to represent the stochastic characteristics of both the wind power and load demand for convenient use with the p-efficient point theory.A probability distribution function for netload forecast error is obtained via the Kernel estimation *** proposed model is applied to a wind-thermal-storage combined power system.A set of extreme scenarios is chosen to validate the effectiveness of the proposed model and *** results indicate that the scheduled energy storage can effectively compensate for the net load forecast error,and the increasing wind power penetration does not necessarily require a linear increase in energy storage.
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