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This research proposes technical and financial evaluation for investment of harmonic mitigation in power network. Main proposal of research is analysis of harmonic impact and harmonic solution by regarding to economic decency for investment. The parallel resonance is harmonic impact that will be mentioned in this research because it is a problem that is mostly emerged in industries that contain non-linear...
This paper is aimed to study the impact of Solar PV Rooftop posing on MEA distribution system. The simulation was made using the PSS/ADEPT program with the system parameters obtained from Geographical Information System (GIS). In the study, the maximum size of Solar PV plant that MEA feeders could accommodate in different locations was quantified; the reduction in distribution losses was evaluated...
This paper proposes an application of Geographic Information System (GIS) to distribution substation planning for distribution systems of Metropolitan Electricity Authority (MEA). The main objective is to serve future load growth and to increase the reliability of the distribution systems. GIS is extensively used in the planning process as it contains comprehensive topological information of electrical...
This paper presents a touch voltage reduction technique for a uniform and two-layer soil by applying grid compression ratio. The design of ground grid is discussed pertinent to its maximum touch and step voltage produced for a given ground potential rise (GPR). The parameters are analyzed to ensure that they conform to the IEEE 80-2000. It is found that, for a given GPR, the maximum touch and step...
The study is separated into 2 parts. Part 1 involves characteristic of uniform soil. If the upper layer of two-layer soil is greater than 16 m, it can be treated as homogeneous one. Part 2 deals with the significant factor and give some suggestions that grounding system designer should know before design. The main objective of this paper is to be used as preliminary guide for first hand designer in...
This paper analyzes the existing performance of insulator strings described in term of the total flash over rate (TFOR) for 69 kV and 115 kV subtransmission lines in a service area of Metropolitan Electricity Authority (MEA), Thailand. Presently, the design and installation of insulator strings for 69 kV and 115 kV subtransmission lines in MEA are based on American National Standards Institute (ANSI)...
This paper presents the effect of lightning waveform to the voltage at the pole top and back flashover rate (BFOR). The result found that short front time of lightning current waveform or high slope will cause high voltage and back flashover rate at the top pole. However the tail time of lightning current waveform will not effect to the top pole voltage and backflash over rate because the impulse...
This paper presents the combined technique from optimal feeder reconfiguration and the installation of distributed generators (DG). The objective is to reduce power loss in distribution system. The optimization problem is solved by simulated annealing method to simultaneously identify the proper on/off patterns of the switches and the optimal location for DG placement. The impacts of this combined...
This paper presents touch voltage reduction technique for uniform and two-layer soil by applying grid compression ratio. The design of ground grid is discussed pertinent to its maximum touch and step voltage produced for a given GPR. The parameters are analyzed to ensure that they conform to the IEEE 80-2000. It is found that, for a given GPR, the maximum touch and step voltages of the rectangle grid,...
The back flashover generated from a lightning stroke hit at different locations: either at the end of pole top or the middle of the span of the overhead ground wire (OHGW), is one of the major causes of sustained interruption in Metropolitan Electricity Authority (MEA)'s distribution system, Thailand. One effective way to reduce the effects of such lightning overvoltage from back flashover is an addition...
This paper presents an external ground design in distribution system for improved lightning performance. Lightning protection is a set of features typically designed into grounding systems at locations subject to lightning damage. Basically, back flashover occurs when the amplitude of the lightning overvoltage experienced by insulator strings in response to direct strikes to a tower or to the shield...
This paper analyzes the effects of the voltage across insulator of 69 kV and 24 kV lines installed on the same pole. The case studies illustrated the lightning strike to direct top pole and mid span of ground wire using the Alternative Transient Program-Electromagnetic Transient Program (ATP-EMTP). The results found that when lightning strike the voltage across the 69 kV line insulator at mid span...
This paper presents contingency redefinition in power system security analysis. The proposed approach employs particle swarm optimization algorithm for optimal settings of the control variables of the optimal power flow problem. The proposed approach has been examined on the standard IEEE 30-bus test system. The results of the proposed method application on the test system show that using coordinated...
This paper presents the service restoration of distribution system with distributed generation for reliability worth in a distribution system. The objective is to minimize the customer outage cost subject to the maximum number of distributed generations, total capacity of distributed generation, bus voltage limits, current transfer capability of the feeders and only one distributed generation for...
This paper presents the overview of smart grid technology to increase the operational as well as technological efficiency of the power distribution network to meet the growing energy demand. Smart grid is sophisticated, digitally enhanced power systems where the use of modern communications and control technologies allows much greater robustness, efficiency and flexibility than today's power systems...
This paper presents a design of permanent magnet machines (PM), such as the permanent magnet axial flux generator for wind turbine generated direct current voltage base on performance requirements. However recent developments in rare earth permanent magnet materials and power electronic devices has awakened interest in alternative generator topologies that can be used to produce direct voltage from...
This paper presents a feeder reconfiguration problem in distribution systems. The objective is to minimize the system power loss and to improve bus voltage profile. The optimization problem is subjected to system constraints consisting of load-point voltage limits, radial configuration format, no load-point interruption and feeder capability limits. A method based on genetic algorithm, a search algorithm...
This paper emphasizes on the implementation of active management scheme to the distribution system with optimal dispatchable distributed generation (DG). The objective function is to minimize the total cost of the active power generated by the DG units. The optimization problem is subject to system constraints consisting of voltage limits, feeder capability limits, generation-demand balance, active...
This paper presents an approach for finding the optimal implementation of feeder reconfiguration in unbalanced loading distribution systems with the objective of power loss reduction. The optimization problem is subjected to system constraints consisting of load-point voltage limits, radial configuration format, no load-point interruption and feeder capability limits. The system power losses and bus...
This paper proposes a methodology based on fuzzy multiobjective and tabu search to determine the optimal on/off patterns of tie and sectionalizing switches for feeder reconfiguration in a distribution system with distributed generators. Three main objectives considered in the feeder reconfiguration problem consist of power loss, feeder load balancing, and number of switching operations of the switches...
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