Power Research

Shripad G. Desai ¹, D. S. Bankar ², Vishal V. Mehtre ³

Affiliations
1 Student M.Tech-Electrical (Power Systems), BharatiVidyapeeth Deemed University College of Engineering, Pune 411 043, IN
2 Associate Professor, Electrical Department, Bharati Vidyapeeth Deemed University College of Engineering, Pune 411 043, IN
3 Student M.Tech-Electrical (Power Systems), Bharati Vidyapeeth Deemed University College of Engineering, Pune 411 043, IN

Abstract

Transients in power system pose severe threat to the operation and control mechanism. various abnormal conditions categorized under short circuit faults have adverse effects on the system operation. Short circuit faults namely a single L-G fault and 3-Φ short circuit faults are to be given major importance to ensure reliability of the overall system. It is well known that these short circuit faults rather symmetrical or unsymmetrical are to be cleared as soon as possible. The clearing time of these fault currents is of major importance and emphasis has to be given on generator types which are capable of clearing such faults in a quick time. The paper focuses on two concerned generator’s mainly used in the wind energy sector namely a DFIG type and the PMSG. Both these WTG (Wind Turbine Generator) topology are analysed for their short circuit capability in terms of impact of short circuit faults, time for recovery after occurrence of short circuit fault and for system oscillations if any.

Keywords

DFIG, PMSG, short circuit, wind farm

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D. S. Bankar ¹, D. B. Talange ²

Affiliations
1 Associate Professor & Ph.D candidate of Electrical Engineering Department, Bharati Vidyapeeth University College of Engineering, Pune - 411043, IN
2 Ph.D IIT Bombay, Professor, Electrical Engineering Department, Govt. College of Engineering, Pune-411005, IN

Abstract

In recent years due to increase in the load demand a lot of emphasis is given on the use of nonconventional energy sources since fossil and atomic fuels will not last forever, and that their use contributes to environmental pollution [1]. Out of all non-conventional energy sources wind has been the fastest growing energy source over the last decade mainly due to very significant improvements in wind energy technology. Doubly fed induction generators have become the most popular type of wind turbine generators due to its excellent characteristics of control. But, these types of generators are susceptible to grid-side low voltage faults and short circuits. Power electronics converter connected on the rotor side affects badly under these conditions. When a short circuit or voltage sag occurs on the grid side, the rotor current of the generator tends to rise, which could cause damage to the rotor convert. To overcome this difficulty RSC is disconnected and crow bar is activated thus the DFIG now acts as the conventional induction machine. Grid codes suggest that these plants are required to remain connected to the grid in the event of voltage dip also they should contribute to the power system by feeding the active and reactive power safely [5]. The LVRT requirement is very important as far as grid stability is concern when a large wind farm is connected to the grid. But it is difficult to satisfy for wind plants using DFIG system since the DFIG stator is directly connected to the grid and the rotor is connected through RSC, hence complete DFIG system is much sensitive to grid disturbances [4]. This paper presents the feed forward current regulator for rotor side converter of DFIG and analyses its low voltage ride through capability. The results show that the LVRT capability of doubly fed induction generator has improved.

Keywords

DFIG, RSC, GSC and LVRT

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Yogesh B. Mandake ¹, D. S. Bankar ¹

Affiliations
1 Bharati Vidyapeeth (Deemed to be University) College of Engineering, Pune, Maharashtra – 411043, IN

Abstract

In daily life travelling becomes vital for human being. Time taken for travelling should be less; it should be economical and easily available. The growing use of travelling vehicles has increased the problem of air pollution, global warming issue and increased use of petroleum. The human awareness for energetic and environmental problems is encouraging the research in alternative solutions for the automotive field, as multiple fuelling, hybridization and electrification. Electric bike can be considered good alternative for both personal and good transportation especially for small and medium distances. Electric bike is normally powered by rechargeable battery and their practical performance is influenced by motor power, battery capacity, road type, operation weight, control etc. Electric bike can be classified into two main categories: First one is pure electric bike which integrates electric motor into bicycle frame or wheels and driven by motor force just using a handle bear throttle. Second one is human-electric hybrid bicycle that supports the rider with electric power only when the rider is pedalling. This paper focus on concept of electric vehicle, major constructional parts, manufacturing companies, market survey, advantages, problems, government initiatives in India, future scope etc.

Keywords

Advantages, Challenges, Electricbike, Electricvehicle, Motor.

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