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Volume 5, Issue 1 2006 Article 8 International Journal of Emerging Electric Power Systems Non-Contact Determination of the Phase Sequence and Voltage Level of Overhead Conductors in Air Insulated Substations Fei Li, University of Strathclyde Philip J. Moore, University of Strathclyde Recommended Citation: Li, Fei and Moore, Philip J. (2006) "Non-Contact Determination of the Phase Sequence and Voltage Level of Overhead Conductors in Air Insulated Substations," International Journal of Emerging Electric Power Systems: Vol. 5: Iss. 1, Article 8. DOI: 10

Vehicle Applications Juan de Santiago, Anders Larsson, and Hans Bernhoff Abstract This paper presents a novel driveline where the load and the energy source are operated at different voltage levels and they are galvanically insulated. The element that couples both part of the driveline is a Two Voltage Level Machine (TVLM). The machine is formed of a self-excited rotor and a stator with two sets of electrically isolated windings for adjustable speed drive applications. Both sets of these three phase windings are independently operated at different voltages. The

Systems first edition, McGraw-Hill Book Company, New York, pp. 393–408, 1950. [8] T. Nazarcik and Z. Benesova, “Analysis of Electromagnetic Field a Vicinity of Multi-Circuit Overhead Lines with Different Voltage Level”, 19th International Symposium on High Voltage Engineering , Pilsen, Czech Republic, 2015.

paper the ER Grid of India using PSS ® E, well-accepted commercial software from Siemens [ 29 ], [ 30 ], [ 31 ]. It comprises of 197 buses alternating current (AC) in voltage level of 765 kV, 400 kV and 220 kV. In the model the total generation of ER Grid is about 34 GW and the buses are loaded at 80% of their nominal capacity. The optimized values have been prepared using Full Newton–Raphson method. The validation of PSSE based load flow is done using Institute of Electrical and Electronics Engineers (IEEE) 30 bus system. The steady state analysis is performed and

increases the number of combinations to obtain a desired voltage level [ 16 ]. Nevertheless, multilevel structures have drawbacks over the traditional two-level configuration mainly are: the increase in the number of circuit components required and thereby increasing the circuit intricacy, which impose complex control scheme that reduces the reliability of the inverter and makes the circuit expensive [ 11 ]. Therefore, in practical implementation, reducing the number of circuit devices is of the main concern. In this paper, a new improved topology of SM inverter with

1 Introduction An important aspect in electricity attendance quality is the voltage level at load buses. Problems such as out of range voltages can cause damages to equipment. This makes voltage regulation an important function to distribution feeders. Distribution systems are usually characterized by load unbalance among the phases, high R/X ratio and lines frequently untransposed. Moreover slight load variations along the day may also create an unbalance. Conventional load flow analysis methods can present convergence problems when applied to this kind of

1 Introduction Nowadays, the renewable energies such as PV systems, uninterruptible power supplies, wind turbines and fuel cells one of the matter purposes of all governments. However, renewable sources have a low output voltage levels. Hence, dc-dc converters with high voltage gain and high efficiency should be used for increasing the voltage level [ 1 , 2 3 4 , 5 ]. In order to achieve the high voltage gain and high efficiency, many dc-dc boost converters with different power levels have been proposed. In fact, by adding the voltage multiplier units (such as

Electric Power Systems: Vol. 9: Iss. 6, Article 3. DOI: 10.2202/1553-779X.1878 Protection System Monitoring in Electric Networks with Embedded Generation Using Petri Nets Vito Calderaro, Vincenzo Galdi, Antonio Piccolo, and Pierluigi Siano Abstract The connection of distributed generation (DG) essentially changes the distribution network operation and creates a range of well-documented effects varying the voltage levels and short circuit currents. Among others, DG can alter protection system operations in distribution networks, leading to the failure of reclosing, the

Emerging Electric Power Systems: Vol. 11: Iss. 4, Article 6. DOI: 10.2202/1553-779X.2487 A Double Wound Flywheel System under Standard Drive Cycles: Simulations and Experiments Janaína Goncalves de Oliveira, Johan Lundin, Juan de Santiago, and Hans Bernhoff Abstract Flywheel systems are attractive for use in electric vehicles, being able to efficiently handle the large power needed for acceleration and regenerative braking. A double wound flywheel machine, divided in two different voltage levels by the windings, acting like a rotating transformer, is studied. The

electricity markets, network access charges are based on contractual arrangements between energy producers and industrial consumers. As the electricity networks are incontestable natural monopolies, the operators are able to set (monopolistic) charges at their own discretion, restricted only by possible cartel office interferences. Estimations show a relation between network access charges and operator's economic independence as well as level of vertical integration: on the low voltage level for an annual consumption of 1700 kW/h, vertically integrated firms set