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Wiguno A.,Sepuluh Nopember Institute of Technology | Mustain A.,State Polytechnic of Malang | Irwansyah W.F.E.,Sepuluh Nopember Institute of Technology | Wibawa G.,Sepuluh Nopember Institute of Technology
Indonesian Journal of Chemistry | Year: 2016

Isothermal vapor-liquid equilibrium (VLE) data for two binary mixtures of methanol + glycerol and 1-propanol + glycerol were determined at the temperature range from (313.15 to 363.15) K using a simple quasi-static ebulliometer. All systems showed that the vapor pressures increased with increasing alcohols (methanol or 1- propanol) concentrations at corresponding system. The Wilson, Non-Random Two-Liquid (NRTL) and Universal Quasi-Chemical (UNIQUAC) activity coefficient models were used to correlate the experimental data. Both systems showed slightly deviations from the ideal liquid phase behavior. © 2016, Gadjah Mada University. All rights reserved.

Radianto D.,State Polytechnic of Malang | Asfani D.A.,Sepuluh Nopember Institute of Technology | Syafaruddin,Hasanuddin University | Hiyama T.,Kumamoto University
International Review of Automatic Control | Year: 2013

This paper presents a new approach of maximum power point tracking (MPPT) for partial shaded total cross tied (TCT) photovoltaic array based on fuzzy logic controller. The proposed method employs MPPT based on fuzzy logic controller comprising two inputs coming from voltage and current sensor. In addition, the photovoltaic array uses total cross tied configuration (TCT) in which it is superior to other configuration such as serial (S), parallel (P), and serial-parallel (SP) configuration. Here, TCT configuration consists of 10 photovoltaic modules by using 5×2 arrangements. Meanwhile, the fuzzy logic controller itself is used to drive boost dc-dc converter through pulse width modulation (PWM). The comparative study of two topologies, TCT (without fuzzy control) and proposed TCT (using fuzzy logic control) is carried out in MATLAB using SIMULINK, Fuzzy Logic Toolbox, and Power System Toolbox. The simulation result shows that TCT photovoltaic array using fuzzy logic controller (FLC) provides both higher power compared with TCT photovoltaic array without fuzzy logic controller. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.

Wang Y.,Northumbria University | Ronilaya F.,State Polytechnic of Malang | Chen X.,Northumbria University | Roskilly A.P.,Northumbria University
Applied Thermal Engineering | Year: 2013

Electrical consumption in a household is not stable but changeable in one day throughout a whole year. The consumption depends on weather, seasons and users. This characteristic of demand makes it difficult to design and build a distributed power generation system to meet the demand for a household. For this reason, a stand-alone distributed power generation system (DPGS) needs to be carefully designed not only to meet the dynamic household electricity demand, but also to be economical. Hence, for a DPGS, it is essential to utilise electrical energy storage (EES) unit to store the excessive energy while power generation is running at off-peak time; and then the EES may supply the stored energy during the peak demand period. This study investigates a distributed power generation system with an electric energy storage unit to meet the dynamic electricity demand in a household. The system composes of one diesel-engine-generator (DG) running with biofuel; a fuel cell; integrated with an energy storage unit including a supercapacitor and a group of batteries. Models have been set up in Dymola software and two different system configurations are proposed and simulated. The characteristics of the integrated DPGS-EES system are presented and discussed. The results show that both configurations are working properly to meet the demand. © 2012 Elsevier Ltd. All rights reserved.

Ronilaya F.,State Polytechnic of Malang | Miyauchi H.,Kumamoto University
International Journal of Emerging Electric Power Systems | Year: 2014

This paper presents a new implementation of a parameter adaptive PID-type fuzzy controller (PAPIDfc) for a grid-supporting inverter of battery to alleviate frequency fluctuations in a wind-diesel power system. A variable speed wind turbine that drives a permanent magnet synchronous generator is assumed for demonstrations. The PAPIDfc controller is built from a set of control rules that adopts the droop method and uses only locally measurable frequency signal. The output control signal is determined from the knowledge base and the fuzzy inference. The input-derivative gain and the output-integral gain of the PAPIDfc are tuned online. To ensure safe battery operating limits, we also propose a protection scheme called intelligent battery protection (IBP). Several simulation experiments are performed by using MATLAB®/SimPowersystems™. Next, to verify the scheme's effectiveness, the simulation results are compared with the results of conventional controllers. The results demonstrate the effectiveness of the PAPIDfc scheme to control a grid-supporting inverter of the battery in the reduction of frequency fluctuations. © 2014 by De Gruyter 2014.

Wahyudi B.,State Polytechnic of Malang | Wahyudi B.,Brawijaya University | Soeparman S.,Brawijaya University | Hoeijmakers H.W.M.,University of Twente
Energy Procedia | Year: 2015

The conventional Savonius turbine is a good concept for small size wind-renewable energy systems; unfortunately always it has low efficiency. Inspired from the Savonius Blade, this research project designed the diffuser form as compartment between S blade and Tandem Blade of Savonius to produce "jet flow" through narrow gap on the advancing blade in order to rotate more powerful the returning blade. The reason to change the air (wind) by using water as working fluid is to increase the body force (BF) which works on the blade due to increasing the density of fluid. The new model of Hydrokinetic Cross Flow Vertical Axis Turbine (CROSSVAT) is developed from Savonius S rotor with using Savonius Diffuser Blade (SDB) and moving deflector (guide blade). The function of SDB is to increase the velocity ratio on narrow gap (Rcv) also the drag force on surface of blades. Research method used the CFD simulation and Response Surface Method (RSM) to optimize the geometry of tandem blade and moving deflector (the moving guide blade). This study results two model CROSSVAT rotor using Tangential Deflector (model 1) and Radial Deflector (model 2). © 2015 The Authors. Published by Elsevier Ltd.

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