64 29 [ 4 T 0= T s- T a- T b PWM ] : V 7 (000) V 8 (111) T 7= k 1 T 0 T 8= (1- k 1) T 0 0 k 1 1 (4) k 1 SV PWM k 1= 0 1 ; 0 < k 1 < 1 k 1= 1g2 T 7= T

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堡牲战汤
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1 29 2 V o l 29 N o J W uhan Inst Chem T ech M ar 2007 : (2007) ( ) : (SV PWM ) SV PWM SV PWM SV PWM SV PWM : ; ; ; : TM 301 : A 0 [ 1 3 ] U PS V dc v Α v Β V ref Α Β SV PWM M A TLABg Sim u link 1 1 (a) 8 8 V k (S a S b S c) 1 (b) 6 V 1 (100) V 6 (101) Πg3 V 7 (000) V 8 (111) 8 V reḟ k Α Πg3 T s V ref= T k V k+ T k+ 1 V k+ 1 k= (1) T s k = 6 k + 1= 1; V k V k+ 1 T k T k+ 1 T k= 3 T s[vαsin (kπg3) - v Βco s (kπg3) ]gv dc (SV PWM ) (2) T k+ 1= 3 T s[vβco s ( (k- 1) Πg3) - v Αsin ( (k- 1) Πg3) ]gv dc SPWM 15% V ref 2 V k V k+ 1 1 SV PWM V ref [ 1 2 ] F ig 1 T he schem atic diagram of th ree- phase SV PWM inverter (1) (2) 1 (b) V ref 6 V a V b T a T ḃ V ref g T a T b T a= 3 T s ( 3 v Α- v Β) g2v dc T b= 3 T sv ΒV dc (3) : : (1962- ) :

k V k+ 1 T k T k+ 1 T k= 3 T s[vαsin (kπg3) - v Βco s (kπg3) ]gv dc (SV PWM ) (2) T k+ 1= 3 T s[vβco s ( (k- 1) Πg3) - v Αsin ( (k- 1) Πg3) ]gv dc SPWM 15% V ref 2 V k V k+ 1 1 SV PWM V ref [ 1 2 ]

2 64 29 [ 4 T 0= T s- T a- T b PWM ] : V 7 (000) V 8 (111) T 7= k 1 T 0 T 8= (1- k 1) T 0 0 k 1 1 (4) k 1 SV PWM k 1= 0 1 ; 0 < k 1 < 1 k 1= 1g2 T 7= T 8= T 0g2 SV PWM 2 (a) V ref g S a S b S c T aon T bon T con 2 SV PWM 2 1 SV PWM V ref SV P2 [ 3 WM ] : (1) V ref v Α v Β (2) V ref SV PWM V ref N = sign (A ) + 2sign (B ) + 4sign (C ) A = v Β B = 3 v Α- v Β C = - ( F ig 2 R egular samp le PWM and SV PWM w avefo rm 3 v Α+ v Β) (3) T a T ḃ T ion= (T s- T d i) g2 i= a b c (8) 1 T a T b 2 (6) (8) T a1= T a T sg(t a+ T b) T b1= T b T sg(t a+ T s T b) 1 T a T b T able 1 T he evaluation of T a and T b V ref g g g g g g T a Y - Y X - X - Z Z T b X Z - Z - Y Y - X X = 3 T sv ΒgV dc Y = T s ( 3v Αg2-2 T aon T bon T con T 1= T 7g2 T 2= T 1+ T ag2 T 3= T 2+ T bg2 2 T aon T bon T con T able 2 T he evaluation of T aon T bon and T con V ref g g g g g g T aon T 2 T 1 T 1 T 3 T 3 T 2 T bon T 1 T 3 T 2 T 2 T 1 T 3 T con T 3 T 2 T 3 T 1 T 2 T SV PWM 3 T ( s 3 v Α- v Β) 2V dc 2 (b) PWM T b= (T db- T dc) = (T bs- T cs) = 2 (a) SV PWM T is= V ri T sgv dc i= a b c (5) T d i= T is+ T e i= a b c (6) T e= T sg2 (7) 2 PWM SV PWM T m ax= m ax (T as T bs T cs) T m ax= m in (T as T bs T cs) (9) T 7= T s- (T m ax+ T e) T 8= (T m in+ T e) 3 v Βg2) Z = T s (3v Αg2+ 3 v Βg2) T e= (1- k 1) T s- (1- k 1) T m ax- k 1T m in (11) (4) T aon T bon T con T 7= k 1 T 0 0 k 1 1 (12) T 8= (1- k 1) T 0 (10) (12) (4) V ref g v ra> v rb> v rc T m in= T cs T m ax= T as V a= V 1 V b= V 2 T a= (T da- T db) = (T as- T bs) = (v ra- v ) rb T s = V dc (13)

PWM w avefo rm 3 v Α+ v Β) (3) T a T ḃ T ion= (T s- T d i) g2 i= a b c (8) 1 T a T b 2 (6) (8) T a1= T a T sg(t a+ T b) T b1= T b T sg(t a+ T s T b) 1 T a T b T able 1 T he evaluation of T a and T b

3 2 : 65 (v rb- v ) rc T s 3 T sv Β k 1= 0 ; = (14) V dc V dc V ref= V dcg 3 M = 1 T a T b (3) V ref (11) (7) PWM SV PWM SV PWM SV PWM T m ax- T m in> T s T d i= (T is- T m in) T sg(t m ax- T m in) i= a b c (15) 3 T ion (i= a b c) 0 5T s 1 kh z V dc = 300 V T s= s 50 H z R = 5 8 L = 20 m H M = 2 T xon gt ṡ V ref= V dcg2m < 1 k 1= V ref= V dcg 3 M = 1 k 1= T aon V ref= V dcg2m < 1 k 1= : F ig 3 T he w avefo rm of modulation function T aonand (1) V ref= V dcg2 k 1= V 58 68% A 8 89% ; k 1= V 63 31% A 8 78% ; k 1= V 63 18% A 9 34% ( 2) V ref = V dcg 3 k 1 = V 45 93% A 8 91% ; k 1= V 47 37% A 8 61% ; k 1= V 47 40% 19 82A 9 13% 3 M < 1 k 1= 0 T aon phase currents w hen M < 1 k 1= 0 (3) SV PWM 4 M < 1 k 1= 0 5 T aon ; SV PWM 1g3 F ig 4 T he w avefo rm of modulation function T aon and phase currents w hen M < 1 k 1= 0 5

< 1 k 1= 0 0 5 1 3 8 : F ig 3 T he w avefo rm of modulation function T aonand (1) V ref= V dcg2 k 1= 0 5 260 V 58 68% 17 28 A 8 89% ; k 1= 0 260 6 V 63 31% 17 33 A 8 78% ; k 1= 1 259 9 V 63 18% 17 23

4 M < 1 k 1= 1 T aon F ig 7 T he phase - F ig 5 T he w avefo rm of modulation function T aon and phase currents w hen M < 1 k 1= 1 7 M < 1 k 1= 0 5 V ab to - phase vo ltage w avefo rm of the inverter w hen M < 1 k 1= M < 1 k 1= 0 5 V ab 6 M < 1 k 1= 0 V ab F ig 6 T he phase - to - phase vo ltage w avefo rm of F ig 8 T he phase - to - phase vo ltage w avefo rm of the inverter w hen M < 1 k 1= 0 the inverter w hen M < 1 k 1= 0

k 1= 0 5 8 M < 1 k 1= 0 5 V ab 6 M < 1 k 1= 0 V ab F ig 6 T he phase - to - phase vo ltage w avefo rm of F ig

5 2 : 67 4 SV PWM E lectronics (1): [2 ] SV PWM [J ] (5): 79- SV PWM SV PWM 83 [3 ] S IM UL IN K PWM [J ] (3): [ 4 ] Chung D W K im J S Sul S K U nified V o ltage M odulation T echnique fo r R eal - T im e T h ree - : [1 ] A M H ava R J Kerkm en T A L ipo Simp le A na2 lytical and Graph ical M ethods fo r Carrier - Based PWM - V S I D rives [J ] IEEE T ranṡ on Pow eṙ Phase Pow er Conversion [J ] IEEE T ranṡ on In2 dustry A pp lications (2): The pr inc iple and a lgor ithm ana lysis of space vector PWM W EN X iao- ling YI X ian- j un (Schoo l of E lectrical and Info rm ation EngineeringW uhan Institute of T echno logy W uhan Ch ina) Abstract: T he p rincip le of SV PWM fo r the th ree - phase vo ltage sou rce inverter is described SV PWM conven tional algo rithm and the SV PWM fast algo rithm w h ich can be easily im p lem en ted on the m icrop rocesso r are p resen ted T he T he equ ivalence and validity of tw o algo rithm s are verified by m ean s of theo retical analysis and sim u lation study In particu lar it is no t necessary to iden tify the sec2 to r to w h ich the vo ltage reference signal belongs u sing the SV PWM fast algo rithm so that its execu t2 ing speed is faster and it is m o re p ractical com pared w ith the SV PWM conven tional algo rithm Key words: SV PWM ; fast algo rithm ; conven tional algo rithm ; sim u lation analysis ( 62 ) Research on m usica l tune recogn ition : XU Guo- qing ZHAN G Yan- duowan G H a i- hu i OU Q ing- (Schoo l of Computer Science and Engineering W uhan Institute of T echno logy W uhan Ch ina) j un Abstract: Fundam en tal frequency is an im po rtan t param eter in m u sical no tes detection and recogn i2 tion T h is thesis in troduces an effective detection m ethod T h is m ethod has a good app rox im ate to the m u sical no te signal in low frequency dom ain and it has a character of no ise restrain ing realizes the p recise frequency reso lu tion Key words:m RA ; DW T; m u sical trune recogn ition It has a h igh app lication value T h is m ethod :

Pow eṙ Phase Pow er Conversion [J ] IEEE T ranṡ on In2 dustry A pp lications 1998 34 (2): 374-380 The pr inc iple and a lgor ithm ana lysis of space vector PWM W EN X iao- ling YI X ian- j un (Schoo

Journal of V ibration Engineering V o l. 20 N o. 3 Jun Ξ (, ) :,,,,,,, Donoho, : ; ; ; ; : T P277; TN : A : (

20 3 2007 6 Journal of V ibration Engineering V o l. 20 N o. 3 Jun. 2007 Ξ (, 210016) :,,,,,,, Donoho, : ; ; ; ; : T P277; TN 911. 7: A : 100424523 (2007) 0320285206,,, [ 1 ],,,,,,, [ 27 ], Donoho [ 7