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# IEE Proceedings - Electric Power Applications

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Displaying Results 1 - 18 of 18
• ### Editorial power division premium awards

Publication Year: 1999, Page(s): 1
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First Page of the Article
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• ### Prospects for large high-temperature superconducting power transformers: conclusions from a design study

Publication Year: 1999, Page(s):41 - 52
Cited by:  Papers (13)  |  Patents (6)
| | PDF (1280 KB)

A design feasibility study has been conducted for a 240 MVA high-temperature superconducting grid auto-transformer. Conclusions are relevant to superconducting power transformers in general. It is argued that economic benefits may be predicted, subject to assumptions about achievable conductor properties, costs of components and power system operating requirements. Liquid nitrogen cryogenics is re... View full abstract»

• ### Jointless track circuit length [for electric railway signalling]

Publication Year: 1999, Page(s):69 - 74
Cited by:  Papers (3)  |  Patents (1)
| | PDF (436 KB)

A mathematical model of a jointless track circuit (JTC) is presented, which allows the shunt sensitivity of either compensated and uncompensated JTCs to be determined. Results are shown for the value and distribution of the shunt sensitivity obtained by the model at different values of the JTC parameters. The point of the worst shunt sensitivity has been defined. A criterion is introduced for the ... View full abstract»

• ### Design, analysis and control of a new repulsive-type magnetic bearing system

Publication Year: 1999, Page(s):33 - 40
Cited by:  Papers (11)
| | PDF (604 KB)

A repulsive-type magnetic bearing system in which the radial bearing section makes good utilisation of the repulsive forces between the stator and the rotor permanent magnets results in a simplified axial control scheme. The authors report the design, analysis, fabrication and implementation of a new repulsive-type magnetic bearing system for a horizontal-shaft machine. The shape and configuration... View full abstract»

• ### Soft switching converter with power limiting feature

Publication Year: 1999, Page(s):95 - 102
Cited by:  Papers (6)
| | PDF (512 KB)

A new zero voltage, soft switching converter is presented. This converter implements ZVS to minimise switching losses and it has special output power limiting characteristics. At a constant switching frequency the output power is limited to a maximum value and power falls at high current and low current. This is suitable for applications where power control is needed and the converter has inherent... View full abstract»

• ### Electrical material data for railway track transmission line parameter studies

Publication Year: 1999, Page(s):60 - 68
Cited by:  Papers (5)
| | PDF (736 KB)

Identification of the equivalent distributed transmission line parameters of rail tracks by electromagnetic field methodology requires numerical values of the electrical material properties of the track components. The authors describe modelling to determine the electrical conductivity, permeability and permittivity of the rails, sleepers, ballast and ground as functions of frequency, current and ... View full abstract»

• ### Force and torque computation from 2-D and 3-D finite element field solutions

Publication Year: 1999, Page(s):25 - 31
Cited by:  Papers (26)  |  Patents (1)
| | PDF (632 KB)

The Coulomb virtual work (CVW) method of force and torque calculation is a development which has received little publicised appraisal or validation particularly for three-dimensional situations. The authors outline the CVW method and describe its application to a range of force calculation problems, showing that the CVW method can be superior in accuracy and ease of implementation to the Maxwell s... View full abstract»

• ### Static and dynamic analysis of a permanent magnet rectilinear Laws' relay actuator

Publication Year: 1999, Page(s):11 - 16
Cited by:  Papers (1)
| | PDF (508 KB)

The authors describe a study of a rectilinear version of the Laws' relay actuator. Finite element analysis is used to model the device and to obtain its static characteristics, with the analysis being coupled to a nonlinear state-variable time domain simulation to determine the dynamic performance. It is shown how a number of dimensional changes to the magnetic circuit and the use of alternative s... View full abstract»

• ### Optimal commutation in average torque control of switched reluctance motors

Publication Year: 1999, Page(s):2 - 10
Cited by:  Papers (25)
| | PDF (760 KB)

The problem of choosing the firing angles within two average torque control schemes for switched reluctance motors, based on current control' and voltage control', respectively is examined. The primary goal is the maximisation of the energy conversion per stroke. Secondary goals of maximising efficiency (within current control) and obtaining approximately flat-topped current waveforms (within vo... View full abstract»

• ### Electromagnetic field modelling for transmission line distributed parameters of railway track

Publication Year: 1999, Page(s):53 - 59
Cited by:  Papers (2)
| | PDF (560 KB)

The authors describe modelling to determine frequency-dependent distributed rail track impedance and admittance for solution by the finite element method. The equivalent transmission line track model is excited by the TEM propagation mode. Maxwell's equations are decoupled in separate two-dimensional calculations of the electromagnetic and electrostatic fields around the track. The summed stored a... View full abstract»

• ### Application of tabu search in optimal system design and operation of MRT power supply systems

Publication Year: 1999, Page(s):75 - 80
Cited by:  Papers (7)
| | PDF (528 KB)

The optimisation of mass rapid transit (MRT) systems is often a slow process as it requires a large number of simulations of train operations. In order to reduce the solution effort, a tabu search is applied. Tabu search is a modern heuristic optimisation method that can achieve an optimal or sub-optimal solution within a reasonably short time. The paper demonstrates how the search is applied over... View full abstract»

• ### Numerical simulation method for the slip power recovery system

Publication Year: 1999, Page(s):17 - 24
Cited by:  Papers (2)
| | PDF (460 KB)

A numerical simulation method for the slip power recovery system is presented. The dq induction-machine model, using flux linkages as state variables is used. This leads to a simple and efficient computer program. The diode bridge rectifier is modelled using three switching functions that are determined by the sign of the corresponding AC currents. The model obtained is very simple, and accurately... View full abstract»

• ### Novel single-stage, single-switch, AC/DC converter with magnetic energy feedback technique for power factor correction

Publication Year: 1999, Page(s):111 - 116
Cited by:  Papers (4)
| | PDF (452 KB)

A novel single-switch, single-stage, AC/DC forward converter with a transformer voltage feedback technique for power factor correction is proposed. The operational principle and analysis of the proposed converter are presented. The proposed converter gives good power factor correction, low line current harmonic distortions, and tight output voltage regulation. The prototype shows that the IEC 555-... View full abstract»

• ### Deadbeat control method for single-phase UPS inverters with compensation of computation delay

Publication Year: 1999, Page(s):123 - 128
Cited by:  Papers (34)
| | PDF (640 KB)

In existing deadbeat control techniques for single-phase UPS inverters, the pulse width of the inverter output voltage is limited by the computation time of the controlling processor. This limits the utilisation of the DC source voltage and slows the response of the control system. A deadbeat control technique is presented which eliminates these limitations by allowing the application of the newly... View full abstract»

• ### Combined filtering system consisting of passive filter with capacitors in parallel with diodes and low-power inverter

Publication Year: 1999, Page(s):88 - 94
Cited by:  Papers (10)
| | PDF (516 KB)

The author presents a combined filtering system consisting of a passive filter with capacitors and an inverter with low power rating. Based on this system, a method for compensating the reactive power demanded by an electrical consumer is described. The volume of the capacitors used in the case of the proposed version represents 25-33% of the volume of the AC capacitors used in classical versions ... View full abstract»

• ### AC side equivalent circuit-based method for harmonic analysis of a converter system

Publication Year: 1999, Page(s):103 - 110
Cited by:  Papers (9)
| | PDF (664 KB)

A new method that can be used in the calculation of characteristic harmonic components generated by a converter system is described. This is based on modulation theory and an AC side equivalent circuit for a converter is derived. The effects of the commutation overlaps and impedance are correctly represented providing that the overlap angles are known. Using this method, the entire harmonic calcul... View full abstract»

• ### Full-bridge soft switching PWM converter with saturable inductors at the secondary side

Publication Year: 1999, Page(s):117 - 122
Cited by:  Papers (11)
| | PDF (628 KB)

An improved full-bridge (FB) soft switching DC-DC converter with saturable inductors at the secondary side is presented and analysed. The main devices are switched on under zero-voltage conditions using the energy stored in the secondary saturable inductors. On the other hand, the secondary diodes are switched off under zero-current conditions due to the large inductance of the saturable inductors... View full abstract»

• ### Application of genetic algorithms to determine worst-case switching overvoltage of MRT systems

Publication Year: 1999, Page(s):81 - 87
Cited by:  Papers (6)
| | PDF (688 KB)

Genetic algorithms (GAs) are applied to determine the worst-case overvoltage caused by nonsimultaneous energisation of mass rapid transit (MRT) power distribution systems. Two GA-based optimisation methods are compared, using case studies performed on a typical MRT system. Simulation results show that the objective function of the GA problem is highly multimodal, discontinuous and noisy, which mak... View full abstract»