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This paper presents a study the generation development plan of Electricité du Laos (EDL) in the north and central 1 region of the Lao people's democratic republic (Lao PDR). This study considered the 12 hydropower development plan projects, which will be connected to the EDL power grid by using the theories of the power flow analysis (voltage, loading, and power loss) and system reliability assessments...
This paper presents the Reliability Centered Maintenance methodology (RCM) for the maintenance of the distribution system of Phontong substation in Vientiane Capital, which is responsible for Electricité du Laos (EDL). The purposes of this study are distribution system reliability improvement and maintenance activities by using the RCM method. The RCM method has used the power interruption statistical...
This paper presents the development of wide area protection (WAP). The studied case focuses on Vientiane Capital area, Lao PDR. It consists seven substations which are connected the loop network in 22 kV distribution system. The protection system based a characteristic are setting on substation each. The fault area in circuit mainly was affecting the operation of protection, when has occurred a fault...
this paper, is a study on the planning and development of the electricity distribution system to supporting economic and society growth in Luangprabang, from the year 2015 -2025, and to reliability improvement of the electricity distribution system in Luangprabang branch, based on the rate economic and social growth. This study also the examined the rate of return on investment (economic rate of return,...
This paper presents research on adaptive overcurrent protection by considering critical clearing time (CCT) for a microgrid system (MGS). The studied case is located in Mae-Sariang district, Chiang Mai province which is a remote area. It is composed of many kinds of user loads, an energy storage system and distributed generations (DGs). When faults occur while MGS is performing in the grid-connected...
This paper presents solar irradiance forecasting in Mae Sariang, Mae Hongson Province, Thailand which has a solar power plant. This solar power plan is a photovoltaic (PV) with capacity power output at 4 MW. However, the adoption of solar irradiance as a power source on a global scale has not been uniform, due to by meteorological conditions, which cause the fluctuations and inconsistencies in PV...
This work presents the reliability improvement of the electrical distribution system of the Thanaleng substation, by simulation analysis using the DIgSILENT Power Factory program. The study considered the outages in the distribution network from temporary and permanent faults. Consequently, outages frequently will directly affect commercial and private electrical consumption. Outages also deteriorate...
This research is aimed to present technical loss analysis in Vientiane capital. Electricité du Laos (EDL), the state enterprise company that is responsible for transmission and distribution of electricity in Lao People's Democratic Republic (Lao PDR). The purposes of this research studies are technical line losses and reduce power losses of distribution in Vientiane capital by using CYMDIST program...
This work is concerned with hydropower scheduling procedure, applied from economic dispatch problems, to determine the optimal operation scheduling of Nam Ngum-1 and Nam Leuk hydropower plants. The hydropower plant was formulated as a nonlinear optimization problem and solved by using the modified lambda iteration method. This objective function was considered to minimize water discharge rate by using...
Numerous methods are known for grid-tie photovoltaic inverters to track the maximum power point and to avoid islanding operation, but the inverter manufacturers generally do not publish which of these methods they have implemented in their products. This paper reviews the most common maximum power point tracking and anti-islanding methods and points out to power quality signatures they may leave in...
This paper presents a calculation of voltage sag magnitude, area of vulnerability spectrum and method for SARFI-indices due to a fault in distribution system of Provincial Electricity Authority of Thailand. Voltage sag is related to power quality problems and reliability of utility. Analysis of voltage sag will help utilities to determine and predict the area of vulnerability in distribution system...
In this paper, the principle of a power conditioning unit for multistring PV power generation system is proposed. The proposed power conditioner is based on the current source inverter (CSI) topology. All PV strings are connected in parallel to a DC bus through the modified wave-shaping circuits. The instantaneous current at a DC bus can be obtained by summing the output DC current of each wave-shaping...
This paper present a modified modulation strategy based on a triangular carrier wave for the three-level neutral-point-clamped (NPC) voltage source inverter (VSI). The switch states of each leg are determined by comparison between the modulation signals and a triangular carrier wave, which is used only of one triangular carrier wave for generate the gating pulses in three-level NPC VSI. The feasibility...
Distributed generations (DG) can be used to enhance power generation systems and improve distribution system efficiency. However, the installation of DG units at non-appropriate location and sizing can result in negative impacts such as an increasing in power losses and violations of system constraints. In this paper, a new DG allocation planning tool is developed for determining the optimal location...
Assessment of distributed generation (DG) is a complicated task and it is a primary importance step in designing and planning of DG installation in distribution systems. The installation of DG units at non-appropriate location and sizing can result in an increasing in power losses and violations of system constraints. In this paper, a new DG assessment tool is developed for studying and evaluating...
This paper presents a procedure for allocating reactive power using artificial neural network (ANN). Artificial neural network is trained based on data from Y-bus matrix. Training and testing of this ANN network have been done with five bus test system. Back propagation learning has been utilized to train the ANN. A numerical example on allocating reactive power using a feed forward back propagation...
This paper presents the design and analysis of both the active and reactive power control of a single-phase voltage source inverter (VSI) for grid-connected photovoltaic (PV) system. The proposed method is based on vector control of power by decoupling control of the active and reactive current components to feed the active and reactive power to the grid. The aim of this research is to control power...
In this paper, the principle of a power conditioning unit for hybrid PV/wind power generation system is proposed. The proposed power conditioner is based on the current source inverter (CSI) topology. All energy sources are connected in parallel to a DC bus through the modified wave-shaping circuits. To achieve the unity power factor at the utility grid, the DC link current can be controlled via the...
Electricity is one of not only the most necessities for the daily life activities of people, but also the major driving force for economic growth and development of every country. Due to the unstorable nature of electricity, the adequate supply of electricity has to be always available and uninterruptible to meet the intermittently growing demand. This paper is proposed Neural Networks (NN) with Backpropagation...
The increasing amount of wind power generation in Thailand power systems requires stability analysis considering interaction between wind-farms and transmission systems. Dynamics introduced by dispersed wind generators at the distribution level can usually be neglected. However, large wind farms have a considerable influence to power system dynamics and must definitely be considered for analyzing...
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