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# IEE Proceedings - Generation, Transmission and Distribution

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Displaying Results 1 - 19 of 19
• ### Influence of load on operating conditions of third harmonic ground-fault protection system of unit connected generators

Publication Year: 1999, Page(s):241 - 248
Cited by:  Papers (7)
| | PDF (548 KB)

The influence of the load of the unit connected generator on the operating conditions of the ground-fault protection of the stator windings of the generator, excited by the ratio of the third harmonic voltage in the generator neutral and at the generator terminals to ground, was analysed. On the basis of the theoretical analysis, experimental tests and computer simulations, relations between the v... View full abstract»

• ### Inverter controller for HVDC systems connected to weak AC systems

Publication Year: 1999, Page(s):235 - 240
Cited by:  Papers (8)
| | PDF (400 KB)

The paper presents a new control strategy for the inverter side of an HVDC power system. The new control algorithm is intended for stability improvement of an HVDC system connected to a very weak receiving AC system. A root-locus analysis based on a detailed analytical system model determines the eigenvalues which are mostly affected by the reduction in strength of the inverter AC system. The feed... View full abstract»

• ### Extended Petri net models for fault diagnosis for substation automation

Publication Year: 1999, Page(s):229 - 234
Cited by:  Papers (34)
| | PDF (344 KB)

In previous work, Petri net models were developed by the authors (1977) for detecting fault locations in general. In the current paper, the models have been modified to include backup protection as well as primary protection. The modification overcomes many limitations of the original models. Hence, the advanced models are more capable of analysing faults in a highly meshed network or network with... View full abstract»

• ### Migration path study of a distribution SCADA system

Publication Year: 1999, Page(s):313 - 317
| | PDF (364 KB)

Owing to competitive changes in the electric power industry, it is essential to protect the large financial and human resources investment a utility makes when acquiring a SCADA/EMS. Past experience has indicated that, with proper planning, an obsolete SCADA/EMS can be incrementally augmented. The migration approach provides immediate access to new technology while capital costs are spread over a ... View full abstract»

• ### Power-frequency magnetic shielding of heavy-current conductors by rectangular shields

Publication Year: 1999, Page(s):223 - 228
Cited by:  Papers (1)
| | PDF (376 KB)

Metallic enclosures of rectangular shape (e.g. galvanised iron trunking) are often installed in large buildings for the purpose of mechanical protection. Recently shielding performance of such enclosures has been of interest as a result of concerns about power-frequency magnetic field interference. The paper addresses shielding characteristics of rectangular shields, based on theoretical discussio... View full abstract»

• ### Applications of modelling UPFC into multi-machine power systems

Publication Year: 1999, Page(s):306 - 312
Cited by:  Papers (23)
| | PDF (328 KB)

The paper establishes a nonlinear dynamic model of a multi-machine power system with a unified power flow controller (UPFC) installed. The linearised Phillips-Heffron model of the system is then derived and used to study oscillation stability. To demonstrate the applications of the models developed in the paper, a case study of a three-machine power system to be installed with a UPFC is presented.... View full abstract»

• ### Fuzzy-logic method for adjustment of variable parameters in load-flow calculation

Publication Year: 1999, Page(s):276 - 282
Cited by:  Papers (7)
| | PDF (376 KB)

The paper presents a new approach using fuzzy logic to adjust variable parameters so as to meet constraints during load flow studies. Parameters to be adjusted include transmission line impedance, phase angle and transformer tap position and the constraints are transmission line power flow and bus voltage magnitude. Versatile apparatus which are used to tune these parameters include the thyristor-... View full abstract»

• ### Wavelet-transform-based algorithm for harmonic analysis of power system waveforms

Publication Year: 1999, Page(s):249 - 254
Cited by:  Papers (83)
| | PDF (392 KB)

The paper develops an approach, based on the wavelet transform, for the evaluation of harmonic contents of power system waveforms. The new algorithm can simultaneously identify all harmonics including integer, noninteger and subharmonics. In the first step of the approach, the frequency spectrum of the waveform is decomposed into subbands using discrete wavelet packet transform filter banks. In th... View full abstract»

• ### Application of algorithms and artificial-intelligence approach for locating multiple harmonics in distribution systems

Publication Year: 1999, Page(s):325 - 329
Cited by:  Papers (7)
| | PDF (324 KB)

A new method is proposed for locating multiple harmonic sources in distribution systems. The proposed method first determines the proper locations for metering measurement using fuzzy clustering. Next, an artificial neural network based on the backpropagation approach is used to identify the most likely location for multiple harmonic sources. A set of systematic algorithmic steps is developed unti... View full abstract»

• ### Feature extraction methods for neural network-based transmission line fault discrimination

Publication Year: 1999, Page(s):209 - 216
Cited by:  Papers (2)
| | PDF (496 KB)

The suitability of conventional distance relays to operate correctly under variations in such factors as source impedance, prefault load and fault resistance is still a problem. This paper describes an alternative approach to nonunit protection of transmission lines using artificial neural networks (ANNs). Particular emphasis is placed on describing a methodology whereby the extraction of the inpu... View full abstract»

• ### Reliability worth of distribution system network reinforcement considering dispersed customer cost data

Publication Year: 1999, Page(s):318 - 324
Cited by:  Papers (5)
| | PDF (376 KB)

Reliability cost/worth analysis plays an important role in distribution system planning and operation. The interruption cost model used in the analysis directly affects the predicted reliability worth used to make reinforcement decisions. Two cost models are presented that can be used in reliability cost analysis: an average or aggregate model; and a probability distribution model. A time sequenti... View full abstract»

• ### Demand-side management opportunities for the UK domestic sector

Publication Year: 1999, Page(s):283 - 293
Cited by:  Papers (23)
| | PDF (568 KB)

The electricity demand signatures of individual UK dwellings, and of the main types of domestic appliance employed by households, have been collected and analysed. Means for modulating these electricity demands have been investigated experimentally. Peak power reductions of up to 60% have been achieved by developing load conscious' control algorithms for individual cooking and washing appliances,... View full abstract»

• ### Integrated approach to transmission services pricing

Publication Year: 1999, Page(s):255 - 260
Cited by:  Papers (6)
| | PDF (428 KB)

The paper presents an intuitively logical split between: (a) embedded; (b) operating; and (c) expansion cost based pricing and methodologies for implementation, for transmission services. A conceptually straightforward mechanism for the equitable allocation of transmission network embedded cost recovery based on capacity-use and reliability benefit is proposed, expansion cost is charged on a long-... View full abstract»

• ### Fast valving scheme using parallel valves for transient stability improvement

Publication Year: 1999, Page(s):330 - 336
Cited by:  Papers (5)
| | PDF (444 KB)

A new fast valving scheme of steam turbines using two parallel valves for improving the transient stability of a power system is proposed. The influence of the actuation time parameters of a conventional fast valving scheme using a single valve is first studied in detail to justify the need for a parallel valve scheme. A systematic procedure for selecting suitable valve actuation times, the sequen... View full abstract»

• ### Modelling of DC drives for power system harmonic analysis

Publication Year: 1999, Page(s):217 - 222
Cited by:  Papers (5)
| | PDF (348 KB)

A three-phase equivalent circuit model is developed to model DC motor drives for power system harmonic analysis. The validity and accuracy of the model were verified by comparing simulation results with field test results. Sensitivity studies are then conducted to determine the key factors affecting the harmonic characteristics of DC drives. Guidelines on modelling DC motor drives for harmonic dis... View full abstract»

• ### Direct load control using fuzzy dynamic programming

Publication Year: 1999, Page(s):294 - 300
Cited by:  Papers (24)
| | PDF (364 KB)

The paper develops a fuzzy dynamic programming (FDP) approach to solving the direct load control (DLC) problem of large air conditioner loads (ACLs). In the formulation, the cycling capacities of the ACLs and the system load demands are all regarded as fuzzy variables. The scheduling of the DLC and the unit commitment (UC) is integrated into an FDP structure to reduce the system peak loads as well... View full abstract»

• ### More sophisticated synchronous machine model and the relevant harmonic power flow study

Publication Year: 1999, Page(s):261 - 268
Cited by:  Papers (6)
| | PDF (416 KB)

A more sophisticated Park equation-based synchronous machine model, used in harmonic load flow study, is proposed. From the physical interpretation of this model, it can be noticed that synchronous machines should also be considered as harmonic sources in power flow study, only if the power network is asymmetrical. This model is then incorporated with the extended decoupling-compensation' network... View full abstract»

• ### Nonlinear adaptive control of TCSC to improve the performance of power systems

Publication Year: 1999, Page(s):301 - 305
Cited by:  Papers (21)
| | PDF (284 KB)

The installation of thyristor controlled series compensation (TCSC) is planned in the Yimin-Fengtun 500 kV transmission lines of the Northeast China power system. To improve the transient stability and dynamic performance of the system, the authors present a nonlinear control scheme for the TCSC. The control scheme is derived by employing a nonlinear theory, the differential geometry theory. Thus,... View full abstract»

• ### Load control services in the management of power system security costs

Publication Year: 1999, Page(s):269 - 275
Cited by:  Papers (8)
| | PDF (396 KB)

The new climate of deregulation in the electricity industry is creating a need for a more transparent cost structure and within this framework the cost of power system security has been a subject of considerable interest. Traditionally power system security has been supplied by out-of-merit generation in the short term and transmission reinforcement in the long term. This paper presents a method o... View full abstract»