Results 31 to 40 of about 21,371 (301)
Interaction influence of harmonics in MIDC transmission systems
The Journal of Engineering, 2019 Owing to the particular distribution of energy and load, the high-voltage direct current transmission system has been greatly developed in China. A number of areas have formed the multi-infeed direct current (MIDC) transmission systems.
Wang Ling +3 more
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MATHEMATICA SCANDINAVICA, 1988 Let \({\mathcal B}\) be a Banach space, \(\sigma\) a \(C_ 0\)-group of isometries of \({\mathcal B}\) with generator \(H\), and \({\mathcal D}\subseteq D(H)\) a \(\sigma\)-invariant core of \(H\). Suppose \(K:{\mathcal D}\to {\mathcal B}\) is a dissipative operator satisfying \[ 1.\quad \| Ka\| \leq k_ 0(\| Ha\| \vee \| a\|),\quad a\in {\mathcal D}, \]
Batty, Charles J.K., Robinson, Derek W.
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Commutation failure caused by AC filter switching In HVDC system
The Journal of Engineering, 2019 Switching AC filter may cause harmonic impact, which may lead to commutation failure of HVDC system. Here, the commutation failure mechanism of HVDC system caused by AC filter switching is studied.
Meng Liu +3 more
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SensorsThis research is dedicated to developing an automatic landing system for shipborne unmanned aerial vehicles (UAVs) based on wireless precise positioning technology.
Tsu-Yu Lo +8 more
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The Journal of Engineering, 2018 Line commutate converter–modular multilevel converter (LCC–MMC) hybrid high voltage direct current (HVDC) system combines the advantages of both LCC-HVDC and MMC-HVDC, and will be wildly used in the future.
Dengjiang Xing +8 more
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Making Almost Commuting Matrices Commute [PDF]
Communications in Mathematical Physics, 2009 Suppose two Hermitian matrices $A,B$ almost commute ($\Vert [A,B] \Vert \leq δ$). Are they close to a commuting pair of Hermitian matrices, $A',B'$, with $\Vert A-A' \Vert,\Vert B-B'\Vert \leq ε$? A theorem of H. Lin shows that this is uniformly true, in that for every $ε>0$ there exists a $δ>0$, independent of the size $N$ of the matrices, for ...
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Energies, 2018 This paper proposes a highly efficient single-phase three-level neutral point clamped (NPC) converter operated by a model predictive control (MPC) method with reduced commutations of switches. The proposed method only allows switching states with none or
Eun-Su Jun, Sangshin Kwak
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New sensorless commutation technique for brushless DC motors [PDF]
, 2009 In brushless DC (BLDC) drives commutation is performed by power electronic devices forming part of an inverter bridge. Switching of the power electronic devices has to be synchronised with rotor position.
Gambetta, D. +3 more
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Applied Sciences, 2018 This paper proposes a convex quadratic optimization commutation method to raise the equalization degree of power loss distribution of coil array for magnetic levitation planar motors.
Shengguo Zhang +2 more
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Suppression measures of commutation failure in MIDC transmission systems
The Journal of Engineering, 2019 With the increasing of direct current (DC) transmission capacity, high-voltage DC (HVDC) location has become more and more intensive, and commutation failure has become increasingly prominent in multi-infeed DC (MIDC） transmission systems.
Wang Qing, Liu Kaipei, Wang Ling
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