SOLID OXIDE FUEL CELL (SOFC) IS A TYPE OF FUEL CELLS IDENTIFIED AS THE LIKELY FUEL CELL TECHNOLOGIES THAT WILL CAPTURE THE MOST SIGNIFICANT MARKET IN THE FUTURE. SOFC USES A SPECIAL SOLID OXIDE CERMET (MOSTLY YTTRIA-STABILIZED ZIRCONIA, YSZ) AS THE ELECTROLYTE AND USUALLY WORKS AT A HIGH TEMPERATURE, IN THE RANGE OF 800-1000 OC TO REACH THE ELECTROLYTES IONIC CONDUCTIVITY REQUIREMENT. ...

UNDERWATER TRAVEL IS GREATLY LIMITED BY THE SPEED THAT CAN BE ATTAINED BY THE VEHICLES. USUALLY, THE MAXIMUM SPEED ACHIEVED BY UNDERWATER VEHICLES IS ABOUT 40 M/S. SUPERCAVITATION CAN BE VIEWED AS A PHENOMENON THAT WOULD HELP US TO BREAK THE SPEED BARRIER IN UNDERWATER VEHICLES. THE IDEA IS TO MAKE THE VEHICLE SURROUNDED BY WATER VAPOR WHILE IT IS TRAVELING UNDERWATER. THUS, THE VEHICLE ACTUALLY TRAVELS IN AIR AND HAS VERY SMALL SKIN FRICTION DRAG. THIS ALLOWS IT TO ATTAIN HIGH SPEEDS UNDERWATER. IT IS REALLY HARD TO CONTROL AND MANEUVER A SUPERCAVITATING VEHICLE. THE FIRST PART OF THIS PAPER DEALS WITH MODELING OF A SUPERCAVITATING TORPEDO. NONLINEAR EQUATIONS OF MOTION ARE PRESENTED IN DETAIL. THE LATTER PART OF THE WORK DEALS WITH FINDING A CONTROLLER TO MANEUVER THE TORPEDO. A CONTROLLER IS OBTAINED BY LQR SYNTHESIS. FOR THE SYNTHESIS, IT IS ASSUMED THAT THE CAVITY IS FIXED AND THE TORPEDO IS SITUATED SYMMETRICALLY IN THE CAVITY. THE ROBUSTNESS ANALYSIS OF THE LQR CONTROLLERS IS CARRIED OUT BY CALCULATING THE GAIN AND PHASE MARGINS. SIMULATIONS OF THE RESPONSE FOR A PERTURBED SYSTEM ALSO HAVE BEEN STUDIED.

IN THIS PAPER WE PRESENT MODELING AND Simulink IMPLEMENTATION OF AN ISOLATED WIND DIESEL HYBRID SYSTEM (WDHS) WHICH UTILIZE A BATTERY BASED ENERGY STORAGE SYSTEM (BESS). THE BESS CONSISTS OF A BATTERY AND A POWER CONVERTER WHICH PERFORMS THE DC TO AC CONVERSION TO INTERFACE THE BATTERY WITH AN ISOLATED GRID. IN ORDER TO HAVE HIGH POWER CAPABILITY, LOW COST, DURABILITY DUE TO IMPROPER USE AND NO ENVIRONMENTAL ISSUES, THE BEST CHOICE FOR WDHS IS THE NI–MH BATTERY. THE MODELING OF THE EVERY PART OF THE HYBRID SYSTEM WHICH CONSIST A DIESEL GENERATOR (DG), A WIND TURBINE GENERATOR (WTG), THE CONSUMER LOAD, A BATTERY STORAGE SYSTEM AND A DUMP LOAD (DL) IS PRESENTED AND THE PERFORMANCE OF THE IS TESTED THROUGH DYNAMIC SIMULATION. SIMULATION RESULTS WITH GRAPHS FOR THE FREQUENCY AND VOLTAGE OF THE ISOLATED POWER SYSTEM, ACTIVE POWERS GENERATED/ABSORBED BY THE DIFFERENT ELEMENTS AND THE BATTERY VOLTAGE/CURRENT/STATE OF CHARGE ARE PRESENTED FOR LOAD AND WIND SPEED CHANGES. THE SIMULATION RESULTS FOR THE BATTERY/NO BATTERY CASES ARE COMPARED AND SHOW A REMARKABLE IMPROVEMENT IN THE SYSTEM DYNAMICS DUE TO THE USE OF THE BESS.

POWER SYSTEM DYNAMICS COURSE (PSDC) IS ONE OF THE MOST IMPORTANT COURSES IN THE MSC/M.TECH PROGRAM OF ELECTRICAL ENGINEERING AT MOST OF THE UNIVERSITIES WORLDWIDE.HOWEVER, DUE TO THE DIFFICULTIES EXIST IN THIS COURSE, STUDENTS ARE UNABLE TO LEARN THE POWER SYSTEMS DYNAMICS, PROPERLY. THIS PAPER INTRODUCES A TOOL BASED ON MATLAB SOFTWARE THAT IS USEFUL FOR EDUCATING PSDC, EFFECTIVELY. A TOOL BASED ON MATPOWER AND Simulink (MATSIM) HAS DEVELOPED IN THIS PAPER. MATSIM UTILIZES MATPOWER FOR POWER FLOW STUDIES WHICH IS REQUIRED TO CALCULATE STEADY-STATE OPERATING POINTS. ALSO, IT USES Simulink TO SOLVE THE DIFFERENTIAL ALGEBRAIC EQUATIONS (DAES) OF A POWER SYSTEM. A SINGLE-MACHINE INFINITE-BUS POWER SYSTEM, A 3-MACHINE POWER SYSTEM, AND A 10-MACHINE POWER SYSTEM ARE PROVIDED AS EXAMPLES IN MATSIM. AT PRESENT IN BEGINNING PHASE, THIS PACKAGE IS ENCOURAGED TO BE USED BY MOST OF THE STUDENTS OF LORESTAN UNIVERSITY, IRAN AND NATIONAL INSTITUTE OF TECHNOLOGY, ROURKELA (NITR) FOR COMPLETING THEIR PSDC ASSIGNMENTS OR STUDIES.