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In this paper, indirect rotor field oriented vector control has been studied for Squirrel Cage Induction Motor (SCIM) Drives and it has been indicated that Through vector control, flux-producing current components and torque will be separated and transient response characteristics are similar to separately excited DC machine and System with any load fluctuations or changes in reference values to same...
The dc bias effects on the magnetizing and magnetic induction are analyzed through their harmonic characteristics. A model transformer in order to analyzed the harmonic characteristic of the single phase power transformer under dc bias condition. The effect of dc bias will seen by the dc current injected on the winding of experiment system. Effect of that the linear value is changed with the ac excitation...
This paper review the effectiveness of the parity space approach to identify faults or disturbance in a system. The most commonly used is the observer based procedures, and redundancy relationship method. This involves analytical mathematical analysis of geometry and bilinear algebra. Then, technological advances which require complex computation such as artificial intelligence and genetic algorithm...
In islanding mode, system frequency is severely disturbed due to imbalance between generation and load demand resulting in overloading or loss of generation cases. In order to cope with these events, under-frequency load shedding scheme (UFLS) is applied to stabilize the frequency. This paper presents an intelligent under frequency load shedding scheme implemented on mini-hydro operating in islanded...
Temperature, especially the hot spot temperature (HST) and top oil temperature (TOT), has played the important rule and became the most effective factor in determination of the insulation life of the transformer. The prediction of HST and TOT is very important for estimating the loss of life (LOL) of the transformer in power system. Therefore, an accurate technique is needed for solving the thermal...
This paper present the speed sensorless Field Oriented Control (FOC) of parallel- connected dual permanent magnet synchronous motor (PMSM) fed by a single inverter. The speed for both motors are estimated by using Model Reference Adaptive System (MRAS) scheme. In this scheme, two different models are used which are reference model and adjustable model. The motor is set to be a reference model and...
Distributed generation has been becoming more well-known in the power sector due to its ability in power loss reduction, low investment cost, increase reliability, and most significantly, to exploit renewable-energy resources. The optimal placement and sizing of distributed generation are necessary for maximizing the distributed generation potential benefits in a power system. In this paper, a novel...
Instantaneous reactive power theory was the most popular control theory used when dealing with harmonics compensations. In conjunction with the instantaneous theory, switching signal generation techniques plays an important role to ensure the correct compensation signal injected in the system. Therefore, this paper discussed on comparative study of five (5) methods used in instantaneous theory namely;...
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Distributed Generation (DG) integrated into distribution networks continued to grow both in number and size. Governments' incentives and obligations for a sustainable energy ensure that DG is going to be an important element in the future distribution systems. To achieve the maximum benefits of DG, factors such as the number and the capacity of the units and the best location have to be considered...
In this paper, we investigate the existing research based on context-awareness elements in various collaborative applications. The investigation is based on seven context awareness entities; application, media, method, tool, platform, framework and device. This work focuses on the application which involves eight context elements; domain, activity of user, context object, locations, type of communication,...
This paper presents a new topology of optimum maximum voltage angle and current total harmonic distortion (CTHD) of uninterruptible power supply (UPS) on three level single phase photovoltaic (PV) - wind power hybrid inverter. It consists of four main circuits; they are a hybrid controller circuit, a charger circuit, a pulse driver and full bridge circuit. Its main energy sources are a PV array and...
This paper present an approach to estimate the customer load confidence interval using statistical distribution model. Time series data of load profile in the utility of Malaysia was analyze and this data was fit with two statistical distribution models, namely the normal and log-normal distribution. Goodness of fit test was performed in the selection of best model. Result shows that the customer...
Demand Response (DR) has gained importance in the recent years. The prime objective of DR is to reduce the maximum demand. There are various DR schemes. This study focuses on price based DR schemes in which consumer is motivated to change his load demand pattern by pricing based incentives. The paper presents an algorithm to solve the load scheduling problem under variable pricing scheme. To this...
In this paper an online method to predict the small disturbance voltage instability based on wide area measurement system is proposed. The proposed method splits the voltage synchrophasors into high frequency and low frequency signals to extract proper features to accurately predict the voltage instability using SVM-based classifier. The proposed method is implemented and tested on slightly modified...
This paper presents the design of single stage electronic ballast for a conventional 250W High Pressure Sodium (HPS) street lighting. Historically the HPS street lighting operating hours is from sunset to dawn which is 12 hours in full brightness. The existing conventional street lighting HPS are powered by magnetic ballasts. The magnetic ballast is a device which consists of coil and core. It is...
Distributed generation systems have become the new focus of the world and microturbine generation system is one of the systems. The connection of a microturbine generator to a distribution system requires the use of an AC/DC/AC power converter which in turn creates a harmonic problem to the distribution system. A modelling of a microturbine generation system on PSCAD is presented and the harmonic...
The paper presents steady-state and transient studies to assess the impact of a 200 MW Central Receiver Solar Power Plant (CRSPP) connection on the Main Interconnected Transmission System (MITS) of Oman. The CRSPP consists mainly of a central solar receiver, power tower, thousands of heliostats, molten salt storage tanks, heat exchangers, steam generator, steam turbine, synchronous generator, and...
Distributed Generation (DG) is an auspicious solution to many power system problems such as voltage regulation, power loss minimization, effective operating power factor, etc. This paper presents a modified Artificial Bee Colony (ABC) algorithm to suit the searching for the optimal DG sizing and placement in a distribution network. The problem formulation and the proposed technique are tested on a...
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