Ice disaster has becoming a significant threat to power system security since recent years. Wireless sensor networks guarantee reliability of information communication under ice disasters, due to their self-organizati...
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This paper proposes a new fault location method in distribution networks using Prony analysis. This method just needs the measured voltage transients without multi-recording nodes. Fault-originated traveling waves pro...
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The characteristics of the positive leader propagation in the inverted rod-plane gap are investigated in this paper. The discharge experiments in a 3-m inverted rod-plane gap were carried out under switching impulse v...
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The geometric form of the leader trajectory is an interesting aspect of long air gap discharge research. In this paper, the 3-D discharge channel tortuosity in 3m rod-plane gaps is obtained by following steps: Firstly...
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Numerical simulations of plasma heating with waves in the ion cyclotron range of frequencies (ICRF) require to iteratively couple a solver for wave propagation in plasmas with a solver of the quasilinear kinetic equat...
Numerical simulations of plasma heating with waves in the ion cyclotron range of frequencies (ICRF) require to iteratively couple a solver for wave propagation in plasmas with a solver of the quasilinear kinetic equation. Among the codes developed for this purpose, the TORIC-SSFPQL package is characterized by its high execution speed. The kinetic code SSFPQL, however, was based on a somewhat simplified physical model, in which some important effects of the toroidal geometry were omitted. We have recently improved this model by taking into account in the zero–banana–width limit the influence of toroidal trapping on the ICRF quasilinear operator. To make the extended model compatible with the representation of the ion distribution functions as a truncated series of Legendre polynomials in the velocity pitch-angle adopted in SSFPQL, a special approach based on the multiprecision arithmetic had to be developed. We describe these new developments, and present first results obtained with the improved model.
Towards the reactive compensation feature of distribution network and integral substation, this paper proposed an integration structure of distribution transformer and STATCOM (DT-STATCOM). It use the surplus capacity...
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Towards the reactive compensation feature of distribution network and integral substation, this paper proposed an integration structure of distribution transformer and STATCOM (DT-STATCOM). It use the surplus capacity of transformer to compensate the reactive power; by setting the connect voltage flexible, it extended the switching devices selection; the integration structure reduce the volume and cost of compensation device. Based on the structure of DT-STATCOM, this paper proposed two novel reactive current detection method across the transformer's ports. Then the paper designed the decision control system using multi-lateral information. Simulation result showed that, the DT-STATCOM system had significant effect on dynamic reactive power compensation, transformer voltage support and imbalance inhibition.
An Electron cyclotron emission（ECE） diagnostic has the unique capability of continuous measurement of the time evolution of the electron temperature *** an ECE system is necessary to be developed for electron temper...
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An Electron cyclotron emission（ECE） diagnostic has the unique capability of continuous measurement of the time evolution of the electron temperature *** an ECE system is necessary to be developed for electron temperature measurement on J-TEXT tokamak,with the major radius R is 1.05m,the minor radius a is 0.27m,plasma current l is 200kA,toroidal field B is *** choice of the 2 harmonic X-mode electron cyclotron emission,propagating perpendicular to the magnetic field,represents the best compromise between good optical thickness（which assures radial localization of the measurement） and short wavelength（which assures both poloidal and radial localization）.A 16-channel heterodyne radiometer system is being built on J-TEXT,which the frequency coverage range of the 16-channel heterodyne radiometer system is 94 GHz（r/a= 0.74） to 125GHz（r/a= 0.40）
Previous work has shown many general space vector PWM algorithms for cascaded H-bridge inverters. To keep the load balance of switches for cascaded H-bridge inverters, complex pulse cycle control must be added to the ...
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Previous work has shown many general space vector PWM algorithms for cascaded H-bridge inverters. To keep the load balance of switches for cascaded H-bridge inverters, complex pulse cycle control must be added to the algorithms. This paper presents carrier phase-shifted discontinuous PWM (CPS-DPWM) algorithm which can keep load balance of switches automatically. More importantly, switching frequency is reduced up to 2/3 of the previous. Simulation results are given for the verification of CPS-DPWM algorithm.
An 18-pulse rectifier based on a step-up or step-down autotransformer in star-fork connection is presented. The voltage vector diagram of the autotransformer is given out and the connection of windings is also analyze...
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An 18-pulse rectifier based on a step-up or step-down autotransformer in star-fork connection is presented. The voltage vector diagram of the autotransformer is given out and the connection of windings is also analyzed. By arrangement the secondly windings properly, the output voltage can be set in a wide range below or above the 3-phase uncontrolled rectifier with a low THD in the input current. key analysis and results obtained via the Matlab simulation and some experimental results are presented for validation of the presented work.
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