space vector modulation inverter states

... ( states appear as notched waves whereas states appear as 662 IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL 38, NO 3, MAY/JUNE 2002 Fig Space voltage vectors of a three-level inverter (a) Space- vector ... of a three-level inverter (a) Space- vector diagram showing different sectors and regions (b) Space- vector diagram showing switching states (c) Sector A space vectors indicating switching times ... formed by the voltage vectors , is in region as shown, the following If the command vector two equations should be satisfied for space- vector PWM: (1) (2) are the respective vector time intervals...

Ngày tải lên: 22/12/2013, 08:16

... switching state vectors For 3-level space vector diagram, the switching vectors can be divided into four types of vectors; zero vector V0 , short vectors VSi , medium vectors VM i and large vectors VLi ... Medium vectors of a three-level NPC inverter VSi Short vectors of a three-level NPC inverter i=1→6 VM i Medium vectors of a three-level NPC inverter i=1→6 VLi Large vectors of a three-level NPC inverter ... scheme 33 2.1 45 Space Vector Diagram of a 3-level Inverter xvii 2.2 Space Vector Diagram for two-level inverter 47 2.3 Space Vector Diagram - Virtual two-level...

Ngày tải lên: 14/09/2015, 08:37

... divide to the virtual rectifier and virtual inverter Fig The indirect space vector modulation is gaining as a standard technique in the matrix converter modulation [6], [4], [8] VDC+ IDC+ S1 S7 ... (2)For input current: Indirect space vector modulation is equivalent circuits combining current source rectifier and voltage source inverter connected by DC-link Inverter stage has a standard ... conver ter Therefore the indirect modulation technique enables well-known space vector PWM to be applied for a rectifier as well as an inverter stage The switches of inverter can have only eight allowed...

Ngày tải lên: 13/05/2014, 00:55

... Phương pháp điều chế vector không gian cho tầng nghịch lưu Tương tự phương pháp điều chế vector không gian cho nghịch lưu bậc, thời g ian đóng ngắt T1 , T2 and T0 tính tốn vector không gian áp ... Khối tính tốn thời gian đóng ngắt vector khơng gian Trong khối này, vị trí sector vector không gian tham khảo xác định cách đo góc quay θ Còn thời gian đóng ngắt vector khơng gian tính theo (6) ... FPGA-Based Vector Control Drives”, International Journal of Electrical and Power Engineering (5): 524-529, 2007 [8] Z Zhou, T Li, T Takahashi and E Ho, “ Design of a universal space vector PWM...

Ngày tải lên: 14/05/2014, 22:39

... lý Space vector PWM •Coi điện áp sine vector độ lớn không đổi quay với vận tốc khơng đổi •PP xấp xỉ điện áp chuẩn Vref tổ hợp switching patterns (V0 tới V7) •Chuyển hệ qui chiếu abc sang αβ: vector ... sang αβ: vector điện áp pha chuyển thành vector hệ qui chiếu tĩnh αβ •Các vector V0 tới V7 chia thành sector, sector 600 •Vref tính từ vector kề hai vector Bộ môn Thiết bị điện Điều khiển máy ... Thiết bị điện Space Vector: hệ thống liên tục Với Vs*  cập nhật ts, khóa converter đóng cắt để nhận Vs s V ds V qs Vds e j e Điều khiển máy điện – N N Tú s Vqs Space Voltage Vector Controller...

Ngày tải lên: 11/07/2014, 02:21

... 2.2 Unitary Space- Time Modulation 2.3 Differential Unitary Space- Time Modulation 2.4 Summary Modulation ... [9] a unitary space- time modulation is defined as S = T /M Φ, where Φ† Φ = IM Notice that it is the M -dimensional subspace spanned by the M columns of S in the T -dimensional vector space that ... channel capacity, space- time coding for the coherent MIMO system has been proposed Space- time codes can mainly be categorized into space- time trellis codes (STTC) [17] and space- time block codes...

Ngày tải lên: 11/09/2015, 14:38

... lyric representation model for song sentiment classification Sentiment Vector Space Model We propose the sentiment vector space model (sVSM) for song sentiment classification Principles of the ... SVM-light algorithm and find that 1,868 of 2,001 VSM training vectors are selected as support vectors while 1,222 s-VSM support vectors are selected This indicates that the VSM model indeed suffers ... presented as follows VS = ( f1 (U ), f (U ), , f T (U )) in which VS represents the sentiment vector for the given song lyric and fi(U) sentiment features which are usually certain statistics...

Ngày tải lên: 20/02/2014, 09:20

... corpus Vector generator Input vector, I Corpus vector, {E} Cosine calculation The most similar vector Figure System Configuration Figure outlines our proposal Suppose that we have the sentence vector ... concerned word “dry.” 2.2 Sentence vector We propose representing the sentence as a sentence vector, i.e., a vector that lists all of the words in the sentence The sentence vector of the first sentence ... by errors in the corpora and data sparseness to be reduced Vector -space model This section explains our trial for applying a vector -space model to lexical transfer starting from a basic idea...

Ngày tải lên: 20/02/2014, 18:20

... 141 Chapter Five SPACE CHALLENGES Bob Preston and John Baker 143 Current Space Activities The Civil Space Sector The Commercial Space Sector The National Security Space Sector World ... Appraisal: United States Air and Space Power in the 21st Century aerospace power must operate; the choices the Air Force faces in a variety of issue areas, from nuclear weapons to space; and the ... appraisal : United States air and space power in the 21st century / edited by Zalmay Khalilzad, Jeremy Shapiro p cm “MR-1314.” Includes bibliographical references ISBN 0-8330-2954-1 United States Air...

Ngày tải lên: 06/03/2014, 16:20

... response ever again  Reinforce (+): IRIS will pull the vector space representation of its last selected utterance towards the vector space representation of the previous user turn, so that the ... will be increased  Discourage (–): IRIS will push the vector space representation of its last selected utterance apart from the vector space representation of the previous user turn, so that ... already mentioned, IRIS architecture is heavily based on a vector space model framework, which includes a standard similarity search module from vector- based information retrieval systems (Salton and...

Ngày tải lên: 07/03/2014, 18:20

... ti there exists a vector ti in the vector space that represents it It then considers the set of all term vectors {ti } to be the generating set of the vector space, thus the space basis If each ... combination of the term vectors {ti } which represents each dk in the vector space Similarly, any query q can be modelled as a vector q that is a linear combination of the term vectors In the standard ... and tj are now term vectors in a 2n dimensional vector space, dk , q are the document and the query It is known from Linear Algebra that if every pair of vectors in a set of vectors is orthogonal,...

Ngày tải lên: 08/03/2014, 21:20

... topological vector space- valued cone metric on X, and X, d is called a topological vector space- valued cone metric space If E is a real Banach space then X, d is called Banach space- valued cone metric space ... vector space- valued cone metric space Define T : X → X as T x x2 /9, then all conditions of Theorem 2.2 are satisfied Corollary 2.4 Let X, d be a complete Banach space- valued cone metric space, ... Fixed Point Theory and Applications Theorem 2.2 Let X, d be a complete topological vector space- valued cone metric space, P be a cone and m, n be positive integers If a mapping T : X → X satisfies:...

Ngày tải lên: 21/06/2014, 10:20

... metric spaces Examples are given to distinguish our results from the known ones Tvs-Valued Cone Metric Spaces Let E be a real Hausdorff topological vector space tvs for short with the zero vector ... topological vector space valued cone metric spaces,” International Journal of Mathematics and Mathematical Sciences, vol 2009, Article ID 560264, pages, 2009 25 H H Schaefer, Topological Vector Spaces, ... develop further the theory of topological vector space valued cone metric spaces with nonnormal cones We prove three general fixed point results in these spaces and deduce as corollaries several...

Ngày tải lên: 21/06/2014, 11:20

... ndimension fuzzy vector, denote it as u1 , u2 , , un , and call the collection of all n-dimension fuzzy vectors i.e., the Cartesian product E × E × · · · × E n-dimensional fuzzy vector space, and ... is compact We call u ∈ En an n-dimension fuzzy number Wang et al defined n-dimensional fuzzy vector space and investigated its properties For any ui ∈ E, i 1, 2, , n, we call the ordered one-dimension ... 2 Advances in Difference Equations memory In one-dimensional fuzzy vector space EN , Park et al proved the existence and uniqueness of fuzzy solutions and presented the...

Ngày tải lên: 21/06/2014, 20:20

... equations of type (1.1) in a Banach space with a normal cone, we refer, for example, to [2] Definitions, notation, and auxiliary statements Let X be a topological vector space over the field R (of course, ... K x1 in the sequel) Recall that, by a wedge [7], or a linear semigroup [8] in a topological vector space X, a closed set K ⊂ X is meant such that α1 x1 + α2 x2 ∈ K for arbitrary {α1 ,α2 } ⊂ [0,+∞) ... 71–82, 2004 ´ [5] A Ronto, “On equivalent solutions of nonlinear equations in a topological vector space with a wedge, Dopovd Natsonalnoă Akademă Nauk Ukraăni, no 1, pp 3035, 2006 ı ıı ı [6]...

Ngày tải lên: 22/06/2014, 18:20

... Sweldens, “Differential unitary spacetime modulation, ” IEEE Transactions on Communications, vol 48, no 12, pp 2041–2052, 2000 [9] B L Hughes, “Differential space- time modulation, ” IEEE Transactions ... new quasiorthogonal space- time block codes based on a Hadamard transformation for four transmit antennas at time 4t: S4t = ij where s4t+4 represents the kth row of S4t+4 , vector m4t+4 consists ... “Differential modulation based on quasi-orthogonal codes,” IEEE Transactions on Wireless Communications, vol 4, no 6, pp 3018–3030, 2005 L.-Y Song and A G Burr, “Differential quasi-orthogonal space- time...

Ngày tải lên: 22/06/2014, 19:20

... differential unitary space- time code matrix to transmit, other log2 M1 bits {bim , m = 2, , log2 M } perform conventional differential unitary space- time modulation, and the modulation will adopt ... Sweldens, “Differential unitary spacetime modulation, ” IEEE Transactions on Communications, vol 48, no 12, pp 2041–2052, 2000 [7] B L Hughes, “Differential space- time modulation, ” IEEE Transactions ... analyzing differential orthogonal space- time coding (DOSTC) scheme and differential unitary space- time code (DUSTC) scheme, we develop the two multiple-amplitude differential space- time coding schemes...

Ngày tải lên: 22/06/2014, 23:20

... performance gap, a vector- MSDD can be used instead [11] This detector organizes the R[k]s into overlapping blocks of size N, with the last vector in the previous block being the first vector in the ... complexity issue in the vector- MSDD is to first transform the received signal vector in (5) into one that we would encounter in a receive-diversity only system Although the optimal vectorMSDD in this ... 2001 [4] B L Hughes, “Differential space- time modulation, ” IEEE Trans Inform Theory, vol 46, no 7, pp 2567–2578, 2000 [5] R Schober and L H.-J Lampe, “Differential modulation diversity,” IEEE Trans...

Ngày tải lên: 23/06/2014, 00:20

... requirement introduces amplitude modulationamplitude modulation (AM-AM) and amplitude modulation- phase modulation (AM-PM) conversions into the transmitted signal Because of this, modulations that transmit ... spectra Unfortunately, subcarrier modulation suffers from a number of disadvantages, namely, greater spacecraft complexity, additional losses in the modulation/ demodulation process, and most important, ... that take on the form of constant envelope modulations, quasi-constant envelope modulations, nonconstant envelope modulations, and finally Nyquist-rate modulations Included in the discussion will...

Ngày tải lên: 03/07/2014, 21:12

... author [15] generalized the theorem to submanifolds with parallel mean vector fields but restricting the ambient space to a complex space form In this article, we consider the above question in contact ... parallel mean curvature vector fields, immersed into a Sasakian space form, and obtain the following: Theorem 1.1 Let (N, ξ, η, ϕ, g) be a (4n + 1)-dimensional Sasakian space form with constant ... submanifolds in complex space forms and Chen’s inequality, Acta Math Sci 25 (2005) 223–232 15 G Li, Submanifolds of complex space forms with equal Kăhler angles and parallel a mean curvature vector fields,...

Ngày tải lên: 06/08/2014, 05:20