Ogunjimi, L. A. O. , Alabi, F. S. , Adepoju T. F. , Agbonjinmi, O. S. , Offiong, U. D. , Osunade, J. A. (2017). Effect of Local Admixture Ipomoea Asarifolia (Ajara) on the Strength Characteristics of Stabilized and Unstabilized Lateritic Blocks. Review of Energy Technologies and Policy Research, 3(1): 24-32. DOI: 10.18488/journal.77.2017.31.24.32
This paper presents a summary of the results of a study on the use of a local admixture Ipomoea asarifolia (‘Ajara’) on the compressive strength and weight of specimens made from both cement stabilized and unstabilized lateritic soils. The effect of Ipomoea asarifolia extractions on the strength characteristic of lateritic blocks was investigated. Three mix proportions of cement: laterite of 0:1, 1:2 and 1:4 using lateritic soils from four different locations from around Ife while using six concentration levels of extracted liquid of Ipomoea asarifolia (0; 20; 40; 60; 80 and 100%) in fresh water as the mixing “water” (fluid). Ipomoea asarifolia specimen was analyzed to determine constituent chemical composition and their effect in reaction with other materials. Sieve analysis of the lateritic of the lateritic soil mix was carried out while a total of 132 – 100 mm cubes size were tested using a 1570 kN Avery-Denison Compression Testing Machine.
Reinforcing Kenya Power National Grid Using Statcom Devices
C. Ndungu , J. Nderu , L. Ngoo , P. Hinga (2017). Reinforcing Kenya Power National Grid Using Statcom Devices. Review of Energy Technologies and Policy Research, 3(1): 17-23. DOI: 10.18488/journal.77.2017.31.17.23
Modern power system is a complex network comprising of numerous distributed generators, transmission lines, switchgears, distribution network and variety of loads. However, the quality of the power supplied to the end users is deteriorating as network expand due to inherent system disturbances such as voltage dips, harmonic distortions and phase angle deviations caused mainly due to low voltage network faults. This has resulted to high level of customers’ dissatisfaction and complains. Research has shown that over 60% of system perturbations are caused by natural events such as lightning strikes and system faults. There are various methods power utilities are employing to realize a robust and reliable power transmission system. Such methods include re-conducting of transmission lines, construction of new transmission lines and in recent time installation of Flexible AC transmission system (FACTs) devices. The FACTS are power electronic devices that have ability of controlling the network voltage condition both in steady and transient state of complex power system. The most common power electronic controllers are, Dynamic voltage stabilizer (DVS), Static Synchronous Compensators (STATCOM), shunt compensators and Unified power flow controller (UPFC). The STATCOM devices are the most widely installed power electronic controllers as they provide excellent performance in stabilizing the power system both in steady state and non-steady state (system disturbances) conditions. It is for this reason the author propose installation of STATCOMs to reinforce the Kenya Power national power grid to achieve a robust and resilience system which improves the power quality supplied to the end users.
This study is one of very few studies which have investigated the impact of installing STATCOM devices to enhance the quality of power supplies and improve on power stability/ reliability in Kenya power grid. In recent time, the power grid has experienced several power disturbances in major load centers.
Experimental Study on Overtopping Performance of a Circular Ramp Wave Energy Converter
Mohammad Yaghoub Abdollahzadeh Jamalabadi , Eisa Ahmadi (2017). Experimental Study on Overtopping Performance of a Circular Ramp Wave Energy Converter. Review of Energy Technologies and Policy Research, 3(1): 1-16. DOI: 10.18488/journal.77.2017.31.1.16
One of the most important debates on energy is planning for the best carriers in each region and determined based on each country's energy basket. The importance of preserving fossil resources becomes evident when we made the prediction. Iran's oil and gas resources will finish up to 136 years to 79 years. Since the clean energy production is a new source in interested field of researchers. Here we study the performance of overtopping with a circular ramp which can be used as a model of wave energy converter.