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A CONTRIBUTION TO THE PROBLEM OF NEUTRAL-POINT VOLTAGE BALANCING IN THREE LEVEL NPC INVERTER
This paper presents a control method for balancing the capacitor voltage of three-level neutral-point-clamped converters (NPC). This control method overcomes one of the main problems of this converter, which is the low frequency voltage oscillation that appears in the neutral point. The algorithm is based on a carrier-based PWM. Studying a offset voltage to have optimal results in relation to power factor and modulation index is a matter of...
7 p hcmute 14/06/2017 323 1
Từ khóa: neutral point clamped converter, offset, modulation index, balancing time, THD
Art in Time : Unknown Comic Book Adventures, 1940-1980
Art in Time" picks up where Dan Nadel's previous book, "Art Out of Time", left off in the celebration of unknown comics art, but this time Nadel focuses on the lesser known works by giants of the industry, like H.G. Peter (the artist for "Wonder Woman"), Sam Glanzman (artist for "Our Army at War"), John Stanley (writer and artist for "Little Lulu"), Harry Lucey (one of the artists behind "Archie"), Jesse Marsh (the artist for "Tarzan"), and...
7 p hcmute 31/05/2017 313 1
Từ khóa: Art in Time, Unknown Comic Book Adventures, 1940-1980
A Design Of Novel Valve Train System For Cylinder Deactivation in SI Engines
Cylinder deactivation is a potential method in improving efficiency and fuel consumption in SI engines. The optimal strategies about driving torque at different operating conditions can improve the fuel consumption in engine. Many recent researches have demonstrated that the cylinder deactivation modes can be successfully applied in improving engine efficiency at different engine loads. Different cylinder deactivation strategies have been...
6 p hcmute 05/01/2017 345 3
Từ khóa: Cylinder deactivation (CDA), Variable valve timing (VVT), Valve train system, Engine efficiency, Fuel consumption
In this comparison, the Dual-Switch Power Gating (DSPG) shows smaller energy loss, shorter crossover time, faster wake-up time than the other power gating schemes such as the Single-Switch and Charge-Recycled Power Gating schemes. Based on these advantages, the DSPG is suggested in this paper as a viable candidate suitable to a fine-grain leakage control scheme, where logic blocks go in and out very frequently and shortly between the active...
7 p hcmute 22/11/2016 405 1
A CONTRIBUTION TO THE PROBLEM OF NEUTRAL-POINT VOLTAGE BALANCING IN THREE LEVEL NPC INVERTER
This paper presents a control method for balancing the capacitor voltage of three-level neutral-point-clamped converters (NPC). This control method overcomes one of the main problems of this converter, which is the low frequency voltage oscillation that appears in the neutral point. The algorithm is based on a carrier-based PWM. Studying a offset voltage to have optimal results in relation to power factor and modulation index is a matter of...
7 p hcmute 16/11/2016 392 1
Từ khóa: neutral point clamped converter, offset, modulation index, balancing time, THD.
Einstein's relativity in metaphor and mathematics
Einstein's relativity in metaphor and mathematics/ Enders A.Bobinson . -- 1st ed.. -- New Jersey: Prentice-Hall, 1990 400p. includes index; 24cm ISBN 0 13 246497 7 1. Space and time. 2. Special relativity. 3. Thuyết tương đối. Dewey Class no. : 530.11 -- dc 21 Call no. : 530.11 R658 Dữ liệu xếp giá SKN000173 (DHSPKT -- KD -- )
15 p hcmute 11/09/2013 423 1
Từ khóa: Space and time, Special relativity, Thuyết tương đối
Adjectives, the adjective phrase and adverbs
Adjective is a word which modifies a noun or pronoun (called the adjective’s subject) by describing, identifying or quantifying words.Adj are attributive when they premodify nouns: appear between the determiner and the head of noun phrase.Adjective is a word which modifies a noun or pronoun (called the adjective’s subject) by describing, identifying or quantifying words.
61 p hcmute 25/07/2012 437 11
Từ khóa: Adjectives, Adverbs, Classification of adjectives, Postposition, Adjective phrase, Adverbs of time
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