Search Results - "Norrga, S"

Steady-State Analysis of Interaction Between Harmonic Components of Arm and Line Quantities of Modular Multilevel Converters by Ilves, K., Antonopoulos, A., Norrga, S., Nee, H-P

“…The fundamental frequency component in the arm currents of a modular multilevel converter is a necessity for the operation of the converter, as is the…”
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Experimental Study of a Soft-Switched Isolated Bidirectional AC-DC Converter Without Auxiliary Circuit by Norrga, S.

“…An isolated ac-dc converter topology includes a capacitively snubbered voltage source converter (VSC) and a cycloconverter, coupled by a medium frequency…”
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A Three-Phase Soft-Switched Isolated AC/DC Converter Without Auxiliary Circuit by Norrga, S., Meier, S., Ostlund, S.

“…This paper describes an ac/dc converter system consisting of a voltage-source converter (VSC) with purely capacitive snubbers and a two-phase by three-phase…”
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Active Snubber Circuit for Source Commutated Converters Utilizing the IGBT in the Linear Region by Kjellqvist, T., Ostlund, S., Norrga, S.

“…This paper describes a gate control method where an IGBT is controlled in its linear region by means of closed loop control in order to regulate the voltage…”
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A new HVDC grid test system for HVDC grid dynamics and protection studies in EMT-type software by Leterme, W, Ahmed, N, Beerten, J, A¨ngquist, L, Van Hertem, D, Norrga, S

“…This paper proposes a new HVDC grid test system for electromagnetic transient analysis, suitable for HVDC power system studies ranging from protection to…”
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Dynamic Analysis of Modular Multilevel Converters by Harnefors, L., Antonopoulos, A., Norrga, S., Angquist, L., Nee, H-P

“…Theory for the dynamics of modular multilevel converters is developed in this paper. It is shown that the sum capacitor voltage in each arm often can be…”
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Analysis and Operation of Modular Multilevel Converters With Phase-Shifted Carrier PWM by Ilves, Kalle, Harnefors, Lennart, Norrga, Staffan, Nee, Hans-Peter

“…Many publications have been presented on the modulation and control of the modular multilevel converter, some of which are based on phase-shifted carrier…”
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Survey of Methods for Selective DC Fault Detection in MTDC Grids by Jahn, I, Johannesson, N, Norrga, S

“…Recent demand of renewable energy generation has placed new requirements on the flexibility of transmission systems. These requirements together with technical…”
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On Energy Storage Requirements in Modular Multilevel Converters by Ilves, Kalle, Norrga, Staffan, Harnefors, Lennart, Nee, Hans-Peter

“…The modular multilevel converter is a promising topology for high-voltage and high-power applications. By using submodules equipped with dc-capacitors…”
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Design and test of VSC assisted resonant current (VARC) DC circuit breaker by A¨ngquist, L, Nee, S, Modeer, T, Baudoin, A, Norrga, S, Belda, NA

“…This paper presents the VSC assisted resonant current (VARC) direct current circuit-breaker concept, which comprises a vacuum interrupter, operated by an…”
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Semi-full-bridge submodule for modular multilevel converters by Ilves, K., Bessegato, L., Harnefors, L., Norrga, S., Nee, H.-P

“…The energy variations in each arm of the modular multilevel converter comprises two components. The first component relates to the difference between the…”
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A New Modulation Method for the Modular Multilevel Converter Allowing Fundamental Switching Frequency by Ilves, Kalle, Antonopoulos, Antonios, Norrga, Staffan, Nee, Hans-Peter

“…This paper presents a new modulation method for the modular multilevel converter. The proposed method is based on a fixed pulse pattern where harmonic…”
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Optimization-Based Cell Selection Method for Grid-Connected Modular Multilevel Converters by Hassanpoor, Arman, Roostaei, Amin, Norrga, Staffan, Lindgren, Markus

“…Modular multilevel converters (MMCs) are widely used in different applications. Due to low-loss operation, compactness, and high modularity, MMC is extremely…”
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A primary-switched line-side converter using zero-voltage switching by Kjaer, P.C., Norrga, S., Ostlund, S.

“…A new primary-switched AC/DC power converter and its modulation are presented. It employs a single- or three-phase transformer, with a matrix converter…”
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Selective Wave-Front Based Protection Algorithm for MTDC Systems by Johannesson, N, Norrga, S, Wikstro¨m, C

“…Protection algorithms which can differentiate between different faults is a necessity for the reliable operation of multiterminal HVDC systems with multiple DC…”
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Predictive Sorting Algorithm for Modular Multilevel Converters Minimizing the Spread in the Submodule Capacitor Voltages by Ilves, Kalle, Harnefors, Lennart, Norrga, Staffan, Nee, Hans-Peter

“…The balancing of the capacitor voltages in modular multilevel converters becomes increasingly difficult when the switching frequency is reduced. Typically, a…”
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Fast HVDC breaker using reduced-rating power electronics by Angquist, L, Norrga, S, Modeer, T, Nee, S

“…A renewed interest for dc breakers has been stimulated by the vision of using multi-terminal HVDC interconnections to manage power systems with high…”
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A Submodule Implementation for Parallel Connection of Capacitors in Modular Multilevel Converters by Ilves, Kalle, Taffner, Franz, Norrga, Staffan, Antonopoulos, Antonios, Harnefors, Lennart, Nee, Hans-Peter

“…In modular multilevel converters, there is a tradeoff between the switching frequency and the voltage ripple in the submodule capacitors. The reason for this…”
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Tolerance Band Modulation Methods for Modular Multilevel Converters by Hassanpoor, Arman, Angquist, Lennart, Norrga, Staffan, Ilves, Kalle, Nee, Hans-Peter

“…Modular multilevel converters (M2Cs) are increasingly used in high-voltage direct current (HVDC) systems. The efficiency of M2Cs is influenced by the…”
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Tank test circuit for fast DC circuit-breakers by Nee, S, Modeer, T, A¨ngquist, L, Norrga, S, Baudoin, A

“…Several concepts have been proposed for fast-acting DC circuit-breakers (DC CB) based on mechanical current-interrupters assisted by power electronic auxiliary…”
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