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The electronic instrument transformers located in the process layer of smart substation may have important technical significance to the relay protection devices located in the bay layer, and it is meaningful to evaluate and analyze the transient characteristics of the electronic instrument transformers. In this paper, taking the electronic current transformer (ECT) based on Rogowski coil for a research...
For the sake of ensuring the operation reliability and stability of high voltage direct current (HVDC) power transmission system, it is needed and meaningful to study the overvoltage characteristics of HVDC system under abnormal condition. In this paper, the different reasons causing the HVDC overvoltage are introduced in brief, and aiming at the ±500kV HVDC project from Jiangling to Echeng, its overvoltage...
Several electricity markets were created in the last two decades by deregulation and restructuring vertically integrated utilities. In order to serve the best interest of participating entities, it is important to operate electricity markets at their maximum efficiency. In most cases, electricity markets were formed to operate on existing physical power systems that had evolved over several decades...
This paper provides a case study in solar radiation and the potential evaluation of solar energy harvesting at 6.431°N, 100.185°E, in Kangar, Perlis, Malaysia. As a state located in the Northern region, Perlis is highly potential in the development of a solar energy harvesting system. However,in order to start harvesting the solar energy as an alternative electricity utility source, it is essential...
This paper presents a low cost innovative duplex channel engineering to simulate and improve specific on-state resistance (Ron) of an Ultra high voltage (UHV) device without compromising on breakdown voltage. In manufacturing of UHV device, tradeoff between on state resistance and breakdown voltage is always present. But with our process design we are able to improve Ron by 15–20% without compromising...
In this paper, assessment based on surface discharge detection and analysis on polluted glass insulators are investigated. The sparks generated due to surface discharge could produce many types of signals. In this study, the optical fibre method is used for the detection of partial discharge signals that happened due to surface discharges. Experiments on both types of clean and polluted glass insulators...
LED technology has been used widely in various applications due to its advantage in term of functionality, high efficiency, low cost, small size and high reliability. In order to improve LED performance and prolong LED's life, High Power LED driver is been developed. LED driver is used to control output voltage by using current mode controlled method. This development of LED driver can increase the...
This paper presents a novel method to optimally place the Distribution Static Synchronous Compensator (D-STATCOM) in a distribution system using the firefly algorithm (FA) for enhancing power quality. In the proposed method, the average voltage total harmonic distortion (THDV), average voltage deviation and total investment cost are considered as the objective functions, where voltage and power limits...
In restructured environment, the increasing load demand leads to transmission congestion in power system. If the congestion is not severe it can be relieved by either generation rescheduling and/or load shedding. The congestion management problem is to be dealt with some other improved methods for a severely congested system. In this paper, methods to relieve congestion by generation rescheduling...
In this paper, the influence of lightning induced voltages (LIV) on distribution lines (DL) is considered and the effects of channel and also geometrical parameters on the values of LIV are processed and the results are discussed accordingly. The results show that the peak values LIV are more dependent on the current peak, return stroke velocity and the conductor height with a linear relationship...
Voltage sag is a temporary voltage drop at the fundamental component of utility voltage line. Because of its nature, fast detecting and compensating of sag is very critical. In this work, adaptive neural network is proposed for detection and compensating of sag conditions. The neural network part uses Adaline structure to model the fundamental component of line voltage. Moreover, an adaptive learning...
The objective of the study is to derive, test and verify the dynamic load model parameters in TNB power system. Measurement tools used including online power quality monitoring system which record the voltage and current during voltage sag and other type of disturbances on the upstream networks. The disturbance data for the same location at different date is recorded and stored in centre server for...
The resistivity of soil or ground is one of the important factors to be considered when choosing for a suitable grounding spot or area. Problems may occur if the ground area around a facility is not suitable for grounding hence the need to move the grounding spot to an area far away from the facility and caused increase in the overall cost of installation. It is known that some parties involves in...
An economic load dispatch model developed for both wind turbines and thermal generators is presented in this paper. In the model, the wind power is considered as a constraint due to random nature of wind speed. This optimization problem is solved to obtain optimal power outputs of thermal generators, while taking into account of given constraints. All these optimal outputs and available wind power...
Currently, there are no motorcycles in the market that provide electrical charging for mobile devices that are being used widely in the modern world. This paper demonstrates the concept of energy recovery through the use of a hybrid system in the exhaust pipe of a motorcycle to charge mobile devices. The term hybrid energy refers to an application that uses two energy conversion devices, that when...
This paper presents a method of generating oxyhydrogen (HHO) gas by utilizing a solar photovoltaic (PV) panel for a vehicle. A 50 W PV panel is used to generate electricity through sun light and powering-up an HHO generator to produce HHO gas. The installation of supplementing the HHO gas into the combustion chamber of four stroke engine is to boost the fuel mixture into complete burning and produces...
This paper presents a digitized Walsh function algorithm as an alternative approach for power components estimation with emphasis on reactive power measurement in linear and nonlinear three-phase load system. The developed algorithm was modeled on the Matlab Simulink software; linear and nonlinear loads were modeled based on practical voltage and current waveforms and tested with the proposed improved...
This paper presents the comparison between two switching techniques for a multi-phase voltage source inverter (VSI) using Space Vector Modulation (SVPWM). Two different techniques which based on large vectors and the combination of large and medium vectors have been examined under a two-level five-phase inverter. The performance of these techniques are observed and evaluated in terms of harmonic contents...
Vast development in power electronics since the last decade has lead to applications of electric drives with phase number greater than three especially in locomotive, naval, aerospace, and electrical vehicles industry. Multi-phase electric drives offer great number of advantages compared to three-phase electric drives but multi-phase drives produce unwanted low-order harmonics that can lead to losses...
This paper illustrates the development of MATLAB/GUIDE (Graphical User Interface Development Environment) software program to simulate the performance of three phase induction machines complete with graphical analysis display on a computer. The selected simulation results used 1 horse power (hp) and 20 hp three phase induction machines. Analysis includes Transient response, Starting method: (a) Rotor...
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