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6 DC-AC

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6 DC-AC

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    1. ?6? DC-AC???? §6.1 ??????????????? §6.2 ????? §6.3??????(PWM)

    2. ?????????????,???????????????? ?????????????????,???????????????????,?????; ???????????????,????????,????????????????????,??????? DC-AC?????6-1???

    3. §6.1 ?????????????? 1??? ???????????????????????????;????????????????????????????: 1)??????? ????????????????(Voltage Source Inverter ??VSI)???????,??6-2??,????????????????????????;??????????????(Current Source Inverter ??CSI),???????,??6-3??,??????????????,???????????

    4. ??????????: a???????????(Variable DC link)???????,??6-4????DC-DC?????????????????,?????????????????,??????????????????,???????????? b???????????(Fixed DC link)???????,?????6-5??????????,???????????PWM???????

    5. 2)?????????????????,??????????? 3)?????????????????????????? 4)???????????????????? 5)???????????????????? ??????????????????VVVF(variable voltage variable frequency)????????CVCF(constant voltage constant frequency)?

    6. 2 ????????? ??????????????,????????????,???????????????,?????(?????)?????????????????????????????,??????????????;??????????????????,?????????????????????????????????????????? ???????????,???????????f??,???????,?????????????6-6?6-7??? ,?????,?????????????,???????;?????,?????????????,???????;??1?4??,????????????????,?????????,????,??????????????;?????,?????????,????,?????????????????2?3??,??????????? ???????????????,?????????????????,????6-8???

    8. 3 ???????? ?????????????????????,??????,?????????????,???????????????: 1)????(Harmonic Factor) ?n?????HFn????n??????????????????,? 2)???(??)??THD (Total harmonic distortion factor) ????????????????????????????????THD??? 3)????(Distortion factor) ??????????????,?????????????????????,??????: ???????????????:

    9. §6.2 ????? 1?????????? ?????????6-9(a)??,??????????????????,?????????????????????????????,???????????????????,??????????,?????????,??????????????C????,????????,B????????,A????????????????

    11. ?Q1??,? ? ?Q2??,? ????????1800?????????,????Ton(Q1?Q2?????)????????? ?????? ??????R???,D1?D2??????,Q1?Q2??????,???????,???? ,?????????, Q1?Q2??????,???????????????Q1?Q2????????,?????????????

    12. ?????????: ????????: ?n=1?,??????????:

    13. ??????????,?Q1??TS/2??,????????????????,????Q2???????,iL?????D2??,??iL??Q2?????iL?????????,Q2??????? ? ???,iL????,Q1???,iL???????,??D2???,?? ??,???????iL??,????????????????,?????Q1?Q2?D1?D2??????? ??D1?D2??,???????(?)??????Q1?Q2??????TS/4,???1800??,????????????????,?????????????,??6-9(c)???

    14. 2????????? ??????????6-10??,?????????????????,???????????????????????????

    16. 1)??????? ?6-10(b)?(c)??????????????????PWM?????,?????Ts,????????,Q1?Q4?????ton;????Q2?Q3??????ton ?????????????Q1?Q4????vAB=Vin;?Q2?Q3????vAB=-Vin ;????????,VAB=0? ???Z??????,?????????????????????????????,????VAB??????????????????????????????,?????????????????

    17. ???Z??????L,?Q1?Q4???, vAB=Vin ,????L???????,?????? ,????t=ton??????,??Q1?Q4?????????, Q1?Q4???,??????????,?????????????,??D3?D2????,??vAB=-Vin ?????????,??????,?????????????????iL=0?,Q2?Q3??,??????????,??L?????????,????t=ton??????,??Q2?Q3?????????,Q2?Q3???,??????????,?????????????,??D1?D4????,??vAB=Vin ?

    18. ??D2?D3(?D1?D4)??,??????????????????(?)??????Q1?Q4(Q2?Q3)??????Ts/4,???1800??,????????????????,??????????????????,??????????????????????? vAB?????????: ——????????? ?n=1?,??????????: ?????????????,???????????4??

    19. 2)????????? ?????????????????????????(??Q1 ?Q3)?PWM????,??????????Q2?Q4?????????? ?????????????????????????,??6-11(a);??????????,???????????????,?????6-11(b)??? ??????????,Q1?Q4??, ,????L???????,Q1??,??????????,?????????????,???D3???L?Q4???????, , ???????????,???????,?????????,??Q4 ??,Q2?Q3??,?????????????????,???????????,???????????

    21. 3)?????? ????????????Q1?Q3????,???1800??;Q2?Q4????,?Q1?Q4???????Q1???,Q4???,?????a???,??6-12(a)?????Q1?Q3????Q2?Q4??,??Q1?Q3??????????,Q2?Q4??????????? ?????,??????????????????????????,???????????????????????,????????????,????????,???????????,????????????

    23. 3??????????????? 1)????? ?????????????????????????,??????????????????? ??????,???????,??????????????,????????????,??????????????????,????? ????????????? ?????: ?? ?????

    24. ????????????,???????????,????????????????????????????????????????,???A0???????; ??????(?????); , ,…????????,????,??? ????,????? ??:

    25. ? ?[ ]????,??????????,????????: ???? ? ?????,????????: ???? ? ?????,????????:

    26. ?????????????? ???????????????,???: ?n???(even)?, , bn=0; ?n???(odd)?, ,??: ??????????????

    27. ??,???????????????,??6-13??,??????: (1)????????????????n??????,??????1/n; (2)???????; (3)??????3???; (4)????????????,???????????? ?6-14????????????

    28. ?6-15????????,?????????,??? ??n???,?

    29. ?????????: ??6-22????,???????????a????? ??,??????????? ? ?, ???????????? ???,? ?,n???????

    30. 4??????????????? ?????????????????,???????????,????,?????????????,?????????????,????????R-L???????? ??????????? ??????????????: ???,???R

    31. ??????????????????(1/n2),????????3??????????1/9,??????????????? ??????????? ?R-L???,?????????????4???,??6-16(a)???

    33. ??1,Q1?Q4?0??????,????????,???????????,??????D1?D4??,Q1?Q4?????? ??2?????????,?????? ,????????Q1?Q4? ???1???2????????,????? ??3??? ,??,Q1?Q4?????,Q2?Q3????,????????????????,????????D2?D3??,??Q2?Q3??,??????????????????,??????4? ??4??? ,????????,????????Q2?Q3,? ??,Q2?Q3?????,D1?D4????,????????? ??????????????6-16(b)???

    34. 5????????? ???????????????,???????????,?????????????;??????,??????????????,?????????? ????LC?????(low pass filter)????????????????,?LC???????????????????,??6-17???

    36. 5 ??????? ????????,?????????????????????????????,????????????????????,??????????????????1200,????????(??)??????????????????????????(3,6,9,),????????????????,???????????????(Red leg,Yellow leg,Blue leg)????1200?

    37. ?G??N?????,180O???????,?????? 6???????????6-20??,??????5?6?1;6?1?2;1?2?3;2?3?4;3?4?5;4?5?6;5?6?1….;??????60?? 6??????????6-21???

    39. ????6??????????:

    40. ??????????????,????,???????????????,????????????? ? ? ???????; ? ? ????????120o??????,????????120o,S1~S6????60o??,??????????????,??????,????????????,????????,??????????????

    41. §6.3??????(PWM) ???????????????????,??????????????????,????????????????,??????????,?????????????????,????????????????????(??6-24??),?????????????????????????????????????????????N?,?????????????????,???????N?????????????????LC????????????,???????? 1964?,????A. Schonung ?H. Stemmler ?????????(PWM: Pulse Width Modulation)???,???????????????????,???DC-AC?????????????,PWM????????????????????????

    43. PWM??????????????????????????,???????????????,?????????????????????????,??????????????;?????????????????????????????????????????????????????????????,????????????????????????????????????????,???????????????????????????PWM???????????????????????????,????????PWM????????,??????????????,?????????????

    44. 1 ?PWM?????? ????????,???????:????????????,???????????,??????????,???????????????????,???????????????????????????????,??????????,?????????? ??,?6-25???????????????????,??????????????,??????,??,??????,???????????????6-25(d)?????????,?????????????????

    46. ?????????????,????????????,??????????????PWM????6-27????????????SPWM?????

    47. ?????????????,????????????????????????,????????????????????,???????????????????????????6-28????????SPWM?????????SPWM??????DC-AC?????????????????? ??????,PWM?SPWM?????,?????????,???????????,?SPWM??,??????????SVPWM??????????,??????????????

    50. 2 PWM?????????? ???(Unipolar)PWM??????(Bipolar)PWM?? ??(???)?????????????????,????PWM?????????????????????PWM????? ???PWM??????6-28??,????SPWM???DC-AC?????????????????????,???????????????????????????(??????)?????????????????????? ????PWM???????????PWM??????????????,??(???)???????????????????,????PWM????????????,?6-29????PWM???????PWM?????,???????????????????????,???????????????????????????,???????????,??????????????????????,??????????SPWM??????,????????

    51. ?????????????????????????????,???PWM???????????,??????,??????????PWM?????

    52. ???——???? fc??????? fr ?? ????????????????p?????,PWM????????????????

    53. ????????,????fr?????,??????fc??????,????????????,???????????,??????????,?????????,???????????,????????1/4?????????? ??????????,???p??,??????????,??????????????????????????????,??????????????????,???p???,??????????,??????????????,???????????????????,??????????,??????????,??????????????????????,???????

    54. ???p????,???????????????????????????????????????,?????????,???p??,????????????????????,?????????????SPWM?????,???????????????????3????,????????????,??,????????????????,p?????? ????????????,???????????????????,???PWM??????????????????,???????????????,????????,??????????????,??????????????;??????,???????????

    55. ????????,??????????????,???????????????????,??????????????,????????????????????????????,??????????,??????????????,?????????????????,?????????????????????

    56. 3)???(Modulation Index) ???(Modulation Index )??: ??MI?,?????????, ????? ????????: V1?????????????;Vin???????????

    57. 3?SPWM???? 1)?????(Natural sampling) ??SPWM???????,????????????????????????,????SPWM????????????? ???????????????,?????????????????????,???????????????,???????????,?????SPWM??,??????????????????? ?????? ??: MI????(?????????????). ??6-30????,????????????,????????????????????,??????????????????????????????????????,??????????????????????????????,??n???????????????:

    59. ??,???????n????????????????????? ??? ? ?,???????????,????dk??????: tA?tB?????,???????????????,????????????????????????????????????????,????????????,?????????????????

    60. 2)?????(Regular sampling) ??????????????(Asymmetric regular sampling)????????(Symmetric regular sampling)?????????????????6-31??,????????? ;?????????? ?

    62. ?????? , , ??????????????????6-31??????????,??6-32?????????????????????????????????????????PWM??????????,?????6-33???

    64. ??6-32??: ???6-32??6-33???PWM??????????: ???????PWM????????????:

    65. ????????????????? ?? ????,? ,???????: ??: ?? ,? ? ????: ? ? ??:

    66. ? ? ??: ??: ?k?PWM??????????: ; ?k?PWM??????????: ; ???????????(Asymmetric modulation)??? ??????(Symmetric modulation)? PWM???????????:

    67. ?k?PWM??????: ??k?PWM???????????: ???? ,?? ????????(Symmetric modulation)?: ??PWM?????????? ,??PWM?????????? ?

    68. ?????????6-34????????????????????? ?????????,??????????????????????,???????,????????? ??????,??????????????????? ??????????,? ???,??????????????,???????????,??????,??????????,???????????????????,??????????????????????????

    70.

    71. ??????????,??????SPWM????????????120o??,???????????????????? ? ? ,????????????????????:

    72. ???????: ???????: ??????????????SPWM???????

    73. ????(???)?????,??PWM?????,???k?PWM??????????????:

    74. ?????????????,PWM??????????????p?????: ?6-35 ??????????,???6-35???????: ?????????? (depth of modulation) or(modulation index)???:? ???????????(clusters)?????: ; ,?? ????(??)???,????????,?????????????(side-bands)? ??????????????,????????? ????(???)???(p<10),????????????????

    76. ???????,??????????????(??3,9,15,21,27…),??????????????;???????????????,??6-36???

    77. ????????2p-1?????????????????(?6-35B),??????????,?????????THD??,??????????? ????????p????????p?,??????:,??????????????THD??p?????????,??????????,?????THD?????

    78. 3)SPWM??????????? ?????????N??,????????????????????????????????????????,????????????????????,??,?N??????????????????????????,???????????????????????????????????????????????????

    79. ???????????N??(N?????),???? ??,?????Vdc/2,???(???)?????V1m ,??K?????? ,??K???????????K?SPWM??????,??????????,??????????????????????,????????,??6-37??,??????????N??,??K?????????SPWM??????: ?:

    80. ?? ??K???????:

    81. ????????,???????N(???????)????,????N????N???,???? ??????,?????????????(??????),?????????????????????,??: ??: ??????????????K???; ??????????????K+1???; ???????????????????,?????N????(??????)?

    82. ?????SPWM?????,??????,N??G????(?6-19),????????????,????????120o,?R??Y?????????: ?: ????,?????(??)????? ,???????????0.866????????????,???????????

    83. ?????????,?MI??1???????????????????,????????????,? ? ? ?????,??????????,??6-39??,???????????,?? ? ??????????????????????? ???????????? ???????????????,????????

    84.

    85. 3 ???????? ????????,?????????????,??????????????????????????????????????????????, ????LC??(?K???????)?m????G????? 1) ?K????G???? G???????6-40??,???????Z1,??????Z2,???:

    86. ?????: ?????: ?????????,??????????????,??????????,??????????????????,????????????? ??????????????????

    87. ???????????,????????,????? ,?????,?????????????????????????????,? ,???? ,???? ???????????????,?????????,?????? ??:b?????????,a???????????,??,b=0,??????????;b????,????????? ?? ,??: ?????,??????????????????,????????????????

    88. ?x,y???,?? ,? ,?? ?????? ?????????????????? ?????????????????? g??????: ????????

    89. ????????????????????????????,?????????????????????,?????????????????????? ,?????????????????????????,??b???: ?? ,??????????: ??????????,??Z1?Z2????????,G???????????????

    90. ?G????????,Z1 ?Z2????,??????,????????,???????: ??,???????,??Z1?Z2??,??K????????????????K? G????? G?????????????? ????? ???,G???????????,?????fc?,?????????

    91. ??????(????)?????????????: ? ,? ,??: ??????????????? ? ,? , ,??: ??b?????????,?????????????

    92. ????????L?C ,????fc?????????????????????,????????????????????????????????????,???????????????????????,???????????2?? ????????????R???????,????,???????????????????????: ??Zc1?Zc2? ???,???????????????,RL???????

    93. 2)m????G???? ?6-42??????????????????

    94. ????m??????????,??????????,?K?G??????????Zc1,m??????????Zcm1,? ,??: ? , ?? ??,? ,?Z2m??????????

    96. m????G??????????: ? ?, ,????????????????? ??????:

    97. ??????,??? ??m?????????????????????,???????????????? ,????????,????[fc, ]??????,????????????,???????????????,??m???????K??????????

    98. ??? 1 ?????????,?????320V,????????????,????????????? 2 ?????(Unipolar)PWM??????(Bipolar)PWM?????? 3??????????????????? 4 ???(Modulation Index)?? 5 ???????????200V,???? ,?? , 1)???????????; 2)???????????????; 6.?6???????????????

    99. 7 ??????????

    100. 8 ???8?????,???????,???????????,????????????? 9 ?6-10(a)?,????????,???????????????????,???????????

    101. 10 ???6-18?????????,??120???????????????????? 11 ???6-18?????????,180????????????????????? 12 ???????????????,??Q1?Q4(Q2?Q3)??????TS/4,???????Q1?Q2?????????? 13 ?????? ??????????? 14 ?????????????(???????????)? 15??15 ??LC?????????????

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