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This paper demonstrates on the development of weak bus identification method using novel reactive power tracing index for determination and selection on appropriate buses for load shedding purpose. Power tracing principles using downstream looking algorithm is utilized for the development of a novel reactive power tracing index known as LQP_LT. The results obtained from the weak bus identification...
Numerous stability indices have been developed to assess the voltage stability of power networks, since it is a powerful tool to identify the weakest bus and critical lines. To expand the knowledge of power tracing theory and its application into voltage stability assessment, this paper adopts the power tracing capable index into load shedding scheme. A modified novel line stability factor index with...
This paper introduces an optimal power filter design method to compensate simultaneously current harmonics and reactive power of a nonlinear load. The power filter consists of a passive RL low-pass filter placed in series with the load and a pure active power filter which has RL elements connected in series with an insulated gate bipolar transistors (IGBTs) based voltage source converter. The filter...
Providing high security and reliability for a power system is compulsory for a transmission service provider (TRANSCO) as this will affect the performance in terms of stability and economy. This can only be achieved by means of ancillary services like reactive power provision. However, to cover the cost of supplying such services, determination of appropriate methods for allocating the cost to consumers...
This paper presents a fuzzy logic controlled shunt active power filter used to compensate harmonic distortion and increase power factor to produce a high power quality in three-phase systems, using MATLAB and its tools Simulink and Power System Blockset. Fuzzy logic (FL) and optimized fuzzy logic with Gravitational Search Algorithm (GSA-FL) was used to control shunt active power filter. The results...
microgrid systems is a new technology for improving reliability and providing alternative energy supplies to the grid system. Low voltage faults in the system are one of the critical issues that require distributed generating sources to disconnect from grid provide energy to the load. Therefore the techniques used in the micro grid system with micro soures can be important in reducing the problems...
In this paper, some of the aspects related to the connectivity of DC microgrids to the main grid are investigated. A prototype system has been designed and implemented to address these aspects. The described system is dependent mainly on sustainable energy sources. Hence, a special care has been given to dealing with this kind of sources while designing different components of the system. Certain...
This paper presents a controlled reactive power compensator (RPC) for a stand-alone synchronous generator (SG)-based wind energy conversion system (WECS). The proposed controlled RPC consists of a synchronous condenser (SC), an AC/DC converter whose output supplies the excitation circuit of the SC, and a control scheme that adapts the converter output to supply the field voltage required to fit the...
This paper presents and describes a smart predictive technique for managing reactive power from a numbers of distributed generation (DG) units connected to low voltage (LV) buses in a distribution network. The technique applies an optimization process in the first stage and in the second stage the procedure is generalized using artificial neural network (ANN). The ANN is trained to replace the role...
This paper focuses on a novel automatic software tool to locate three major power quality disturbances, i.e. voltage sag, transient and harmonic. The software tool developed is to locate the source of these disturbances relative to a monitoring point. The methods employed in the software only require the current and voltage data. For locating the source of voltage sag, the product of the RMS current...
Vulnerability assessment in power systems is important so as to determine how vulnerable a power system in case of any unforeseen catastrophic events. To assess the level of system strength or weakness relative to the occurrence of an undesired event, a quantitative measure based on vulnerability index is often considered. The objective of this paper is to investigate and compare the performance of...
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