January 2013

Volume: 12, Issue: 1, January' 2013

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Voltage Improvement and Power Loss Reduction for a Typical Sub-transmission region Using Optimally Placed and Sized Distributed Generation

Authors: H. Musa, S.S. Adamu

Abstract:

Recent unbundling of Nigerian power holding companies into small units have created opportunities for involvement of independent power generation companies. Remarkable achievements and improvements are expected in power quality especially in the northern part of the country where power quality low is and serious power losses along the transmission and distribution lines of the power system are the norm. This paper proposes using particle swarm optimization (PSO) for allocation and sizing of Distributed Generation (DG) in Shiroro complex that supplies the northern part of Nigeria based on National Control Centre’s allocation using real data of the network. The study involves simulations for various load conditions in a power flow solutions. Based on the results the   presence of DG in the network has greatly improved the voltage profile as well as power loss reduction in the region.

(pp. 669-672)                    Download PDF

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Effect of Slack Bus Selection in Load Flow Solution and the Total Generation Cost

Authors: Jumana A. Alshawawreh, Atef S. Al-Mashaqbeh

Abstract:

The effect of slack bus selection in power system is examined in this paper, where the results show an extreme variation in the transmission line losses and the total generation cost based on the slack bus selection. The total generation cost was decreased by approximate 0.5 million dollar per a year without using any minimizing techniques. the generation cost and the total power losses are also affected by the slack bus voltage, where the combination between the slack bus and its voltage should be considered in the optimal power flow problem.

(pp. 673-678)                    Download PDF

 

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Complex Priority Inheritance in real time operating System for 8-bit Microcontroller

Authors: Archana Patil, Pallavi Patil

Abstract:

This paper presents a complex priority inheritance (CPI) for real time operating system (RTOS), which introduces CPI for assigning priority for system task and compares it with traditional simple priority inheritance (SPI). However, it has been proved here that CPI has more priority resolving power than SPI. Also as number of task is increased or decreased the deadline adherence changes in SPI, while the same is maintained in CPI. Atmel’s In-System Programming software is used to download program into the microcontroller flash memory and the board is capable of hosting various microcontrollers from the AVR family.

(pp. 679-685)                    Download PDF