Blar i NTNU Open på forfatter "Tiwari, Raghbendra"
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Active Compensation of Unbalanced Load Currents in Grid Connected Voltage Source Converters
Tiwari, Raghbendra; Nilsen, Roy (Chapter, 2019)For a 2-level 3-phase voltage source converter connected to the grid, it should be capable of supporting the grid with maximum possible active and reactive power during balanced and unbalanced load condition. This paper ... -
Active NPC Converter for Variable Speed Operation of Pumped Storage Hydropower Plant
Tiwari, Raghbendra; Nilsen, Roy; Nysveen, Arne (Chapter, 2020)This paper discusses the full size Active Neutral Point Clamped (ANPC) Converter for large scale (100 MW, 13-15 kV) synchronous machine in a pumped storage hydropower application to enable the variable speed operation. ... -
Analytical Loss Equations for Three Level Active Neutral Point Clamped Converters
Tiwari, Raghbendra; Nilsen, Roy (Chapter, 2020)This paper presents the analytical expressions that can be used to calculate conduction and switching losses in each devices of an Active Neutral Point Clamped Converter. These expressions can be used to determine the ... -
Application of AC Superconducting Windings in Large PM Synchronous Generators for Wind Power
Tiwari, Raghbendra (Master thesis, 2012)Superconductors are known for carrying very high current density without any loss of energy. This characteristic helps to achieve very high power capacity with compact size of machine. In application of superconductors, ... -
Control Methods for Operation of Pumped Storage Plants With Full-Size Back-to-Back Converter Fed Synchronous Machines
Tiwari, Raghbendra; Nilsen, Roy; Mo, Olve; Nysveen, Arne (Peer reviewed; Journal article, 2023)A full-size converter-fed synchronous machine (CFSM) technology is emerging as the most flexible system for pumped storage plants for efficient operation in a wide range of water flows, which is not the case in existing ... -
Control Strategies for Variable Speed Operation of Pumped Storage Plants with Full-size Converter Fed Synchronous Machines
Tiwari, Raghbendra; Nilsen, Roy; Mo, Olve (Chapter, 2021)The full-size converter fed synchronous machine (CFSM) for variable speed operation of a pumped storage power plant exhibits multiple advantages over the state-of-the-art Doubly Fed Induction Machine (DFIM) technology. The ... -
Converter Solutions and Control Methods for Variable Speed Operation of Pumped Storage Power Plants
Tiwari, Raghbendra (HydroCen brief;Nr. 25, Report, 2023) -
Evaluation and Comparison between Multilevel Converters for Variable Speed Operation of Pumped Storage Power Plants with Full-size Converters
Tiwari, Raghbendra; Nilsen, Roy; Nysveen, Arne (Chapter, 2021)This paper compares the full-size converter topologies for the converter fed synchronous machines which can enable the fixed speed pumped storage power plant to variable speed operation. Three converter topologies: Neutral ... -
Frequency Converter Solutions and Control Methods for Varible Speed Operation of Pumped Storage Plants
Tiwari, Raghbendra (Doctoral theses at NTNU;2023:399, Doctoral thesis, 2023)Pumped storage hydropower plants (PSHP) are widely used for bulk energy storage around the world. The variable speed operation of these plants further enables their capability to regulate the power in pump mode as well. ...