# IET Generation, Transmission & Distribution

## Filter Results

Displaying Results 1 - 13 of 13
• ### Harmonic load-flow approach based on the possibility theory

Publication Year: 2011, Page(s):393 - 404
Cited by:  Papers (4)
| | PDF (883 KB)

Harmonics in power systems are responsible for several technical problems that justify the development of models to study them. Well-established models exist to analyse the harmonic load-flow (HLF) from a deterministic point of view. Moreover, models based on the probability theory have been developed to deal with the inherent variability and random nature of loads, network configuration etc. In t... View full abstract»

• ### Study of a coherency-based simple dynamic equivalent for transient stability assessment

Publication Year: 2011, Page(s):405 - 416
Cited by:  Papers (9)
| | PDF (459 KB)

Earlier, a simple dynamic equivalent for a power system external area containing a group of coherent generators was proposed in the literature. In the proposed method, all the coherent generators are first decomposed into smaller generators. This is a new concept. The smaller generators are then aggregated in two levels. In this study, a new alternative and much more justified approach is proposed... View full abstract»

• ### Power flow initialisation of dynamic studies with induction motor loads

Publication Year: 2011, Page(s):417 - 424
Cited by:  Papers (2)
| | PDF (382 KB)

The initialisation of most power system stability studies is carried out with the outcome of a power flow solution using a constant power representation of the load that may contain voltage dependency. However, such an approach may not be suitable when an important component of the system load is made up of induction motors because of a natural mismatch between the power flow scheduled power and t... View full abstract»

• ### Hybrid genetic-fuzzy algorithm for volt/var/total harmonic distortion control of distribution systems with high penetration of non-linear loads

Publication Year: 2011, Page(s):425 - 439
Cited by:  Papers (14)
| | PDF (1082 KB)

A hybrid genetic-fuzzy algorithm (GA-Fuzzy) is proposed for optimal volt/var/total harmonic distortion (THD) control in distorted distribution systems serving non-linear loads. Load interval division (over a 24 h period) and optimal scheduling of load tap changer and switched shunt capacitors for simultaneously minimising energy losses and improving the power quality (as recommended by the IEEE 51... View full abstract»

• ### Influence of the conductor temperature error on the overhead line ampacity monitoring systems

Publication Year: 2011, Page(s):440 - 447
Cited by:  Papers (12)
| | PDF (553 KB)

Many real-time overhead line ampacity monitoring systems are based on the calculation of wind speed. The wind speed is obtained from the conductor temperature. The conductor temperature can be measured directly or it can be obtained indirectly from other magnitudes such as the tension or the sag. An error in the temperature difference gives as a result an error in the calculated wind speed and amp... View full abstract»

• ### Reactive support allocation using improved Y-bus matrix method

Publication Year: 2011, Page(s):448 - 460
Cited by:  Papers (3)
| | PDF (150 KB)

In deregulated power systems ancillary services including reactive power supply are unbundled for transparency and accurate cost identification. Sufficient reactive power supply is essential for secure operation of power systems. Reactive power is supplied by generation-based and static reactive power sources and is used for two purposes: direct consumption at loads and system-wide voltage managem... View full abstract»

• ### Placement of power quality monitors using enhanced genetic algorithm and wavelet transform

Publication Year: 2011, Page(s):461 - 466
Cited by:  Papers (4)
| | PDF (345 KB)

Power quality (PQ) problems include harmonics, voltage flicker, three-phase imbalance, voltage swell/sag, interruption, switching transient and so on. Identification of accurate location and occurrence time of PQ problem is important for understanding the underlying cause and to prevent future occurrence. This study presents a new method for placement of power quality measurement facilities to ide... View full abstract»

• ### Further improvements on impedance-based fault location for power distribution systems

Publication Year: 2011, Page(s):467 - 478
Cited by:  Papers (31)
| | PDF (409 KB)

In this study, further improvements regarding the fault location problem for power distribution systems are presented. The proposed improvements relate to the capacitive effect consideration on impedance-based fault location methods, by considering an exact line segment model for the distribution line. The proposed developments, which consist of a new formulation for the fault location problem and... View full abstract»

• ### Mitigating 161 kV electromagnetic potential transformers' ferroresonance with damping reactors in a gas-insulated switchgear

Publication Year: 2011, Page(s):479 - 488
Cited by:  Papers (2)
| | PDF (1038 KB)

This study presents a successful mitigation experience of ferroresonance (FR) with damping reactors (DR) involving electromagnetic potential transformers (PT) of a 161 kV gas-insulated switchgear (GIS) in Taiwan. PTs have a typically low thermal capacity and high accuracy because of their measuring functions. Low core losses are necessary to obtain high accuracy, but they also reduce its damping a... View full abstract»

• ### Value-based allocation and settlement of reserves in electricity markets

Publication Year: 2011, Page(s):489 - 495
Cited by:  Papers (3)
| | PDF (277 KB)

This study proposes a new value-based probabilistic optimal allocation methodology for energy and spinning reserve through cost`benefits analysis approach. The model implements an AC optimal power flow (AC OPF)-based co-optimisation algorithm for dispatching energy and operating reserve. A state sampling Monte Carlo simulation (MCS) approach is implemented to model random failure of system eleme... View full abstract»

• ### Wavelet-based protection strategy for DC faults in multi-terminal VSC HVDC systems

Publication Year: 2011, Page(s):496 - 503
Cited by:  Papers (55)
| | PDF (464 KB)

A new protection algorithm for DC line faults in multi-terminal high voltage DC (MTDC) systems is proposed in this study. A four-terminal MTDC model is used to investigate fault behaviour and detection using the simulation program PSCAD/EMTDC. The simulation results are post-processed using Matlab. The fault clearing must be done very rapidly, to limit the effect of the fault on neighbouring DC li... View full abstract»

• ### Evaluation and improvement of generators reactive power margins in interconnected power systems

Publication Year: 2011, Page(s):504 - 518
Cited by:  Papers (3)
| | PDF (968 KB)

The amount of reactive power margin available in a system determines its proximity to voltage instability under normal and emergency conditions. More the reactive power margin, better is the systems security and vice-versa. A hypothetical way of improving the reactive margin of a synchronous generator is to reduce the real power generation within its mega volt-ampere (MVA) ratings. This real power... View full abstract»

• ### Techniques and methodologies for power quality analysis and disturbances classification in power systems: a review

Publication Year: 2011, Page(s):519 - 529
Cited by:  Papers (35)
| | PDF (193 KB)

The relevance of power quality (PQ) issues has recently augmented because of the increased use of power electronic equipment, which results in a voltage deviation and current waveforms. The PQ monitoring is covered by two main subjects: the development of PQ indices to quantify the power supply quality and the electrical disturbances detection such as harmonics, sags, swells etc., which allows kno... View full abstract»

## Aims & Scope

IET Generation, Transmission & Distribution is intended as a forum for the publication and discussion of current practice and future developments in electric power generation, transmission and distribution.

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