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第 6 章 DC-AC 变换技术 PowerPoint PPT Presentation


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第 6 章 DC-AC 变换技术. §6.1 逆变器分类、功率流向和波形指标 §6.2  方波逆变器 §6.3 脉冲宽度调制( PWM ). 返回. 把直流电变成交流电称为逆变,相应的功率变换装置被称为逆变器。 如果把逆变器的交流侧接到交流电源上,把直流电逆变成同频率的交流电送到电网去,叫有源逆变; 如果逆变器的交流侧不与电网连接,而是直接接到负载,即把直流电逆变成某一频率的交流电供给负载,则叫无源逆变。 DC-AC 方框图如图 6-1 所示。. 图 6-1 DC-AC 方框图. §6.1 逆变器分类、功率流方向和指标. 1 、分类

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第 6 章 DC-AC 变换技术

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6 dc ac

6 DC-AC

  • 6.1

  • 6.2

  • 6.3PWM


6 dc ac

  • DC-AC6-1

6-1 DC-AC


6 dc ac

6.1

1

  • 1

  • Voltage Source Inverter VSI6-2,Current Source Inverter CSI6-3

6-3

6-2


6 dc ac

  • aVariable DC link6-4DC-DC

  • bFixed DC link6-5PWM

6-4

6-5


6 dc ac

  • 2

  • 3

  • 4

  • 5

    VVVF(variable voltage variable frequency)CVCF(constant voltage constant frequency)


6 dc ac

2

  • 6-66-71423

  • 6-8


6 dc ac

6-6

6-8

6-7


6 dc ac

3

  • 1Harmonic Factor

  • nHFnn

  • 2THD (Total harmonic distortion factor)

  • THD

  • 3Distortion factor


6 dc ac

6.2

1

  • 6-9aCBA


6 dc ac

6-9


6 dc ac

  • Q1

  • Q2 1800TonQ1Q2

  • RD1D2Q1Q2 Q1Q2Q1Q2


6 dc ac

  • n=1


6 dc ac

  • Q1TS/2Q2iLD2iLQ2iLQ2

  • iLQ1iLD2 iLQ1Q2D1D2

  • D1D2()Q1Q2TS/418006-9c


6 dc ac

2

  • 6-10


6 dc ac

6-10


6 dc ac

  • 1)

  • 6-10bcPWMTsQ1Q4tonQ2Q3ton Q1Q4vAB=VinQ2Q3vAB=-VinVAB=0

  • ZVAB


6 dc ac

  • ZLQ1Q4 vAB=VinL t=tonQ1Q4 Q1Q4D3D2vAB=-ViniL=0Q2Q3Lt=tonQ2Q3Q2Q3D1D4vAB=Vin


6 dc ac

  • D2D3(D1D4)()Q1Q4Q2Q3Ts/41800

  • vAB

  • n=1

  • 4


6 dc ac

  • 2)

  • (Q1 Q3)PWMQ2Q4

  • 6-11a6-11(b)

  • Q1Q4 LQ1D3LQ4 Q4Q2Q3


6 dc ac

6-11


6 dc ac

  • 3)

  • Q1Q31800Q2Q4Q1Q4Q1Q4a6-12aQ1Q3Q2Q4Q1Q3Q2Q4


6 dc ac

6-12


6 dc ac

  • 3

  • 1)


6 dc ac

  • A0


6 dc ac

  • [ ]


6 dc ac

  • n(even) , bn=0

  • nodd

6-13


6 dc ac

  • 6-13

  • 1n1/n

  • (2)

  • (3)3

  • (4)

  • 6-14

6-14


6 dc ac

  • 6-15

  • n

6-15


6 dc ac

  • 6-22

  • n


6 dc ac

  • 4

  • R-L

  • R


6 dc ac

  • 1/n231/9

  • R-L46-16a


6 dc ac

6-16


6 dc ac

  • 1Q1Q40D1D4Q1Q4

  • 2 Q1Q4

  • 12

  • 3 Q1Q4Q2Q3D2D3Q2Q34

  • 4 Q2Q3 Q2Q3D1D4

  • 6-16b


6 dc ac

  • 5

  • LClow pass filterLC6-17


6 dc ac

6-17 LC

357LC

LCVAPWM


6 dc ac

  • 5

  • 1200369Red legYellow legBlue leg1200


6 dc ac

  • GN180O

  • 66-20561612123234345456561.60 66-21

6-20 61800


6 dc ac

6-21


6 dc ac

  • 6


6 dc ac

  • 120o120oS1S660o


6 3 pwm

6.3PWM

  • 6-24NNLC

  • 1964A. Schonung H. Stemmler PWM: Pulse Width ModulationDC-ACPWM


6 dc ac

6-24N


6 dc ac

  • PWMPWMPWM


6 dc ac

1 PWM

6-256-25(d)


6 dc ac

6-26

6-25

6-26(a)NN,6-26(b),6-27SPWM


6 dc ac

  • PWM6-27SPWM

6-27SPWM


6 dc ac

  • 6-28SPWMSPWMDC-AC

  • PWMSPWMSPWMSVPWM


6 dc ac

6-28 SPWM


6 dc ac

6-29 SPWMDC-AC


6 dc ac

2 PWM

  • UnipolarPWM(Bipolar)PWM

  • PWMPWM PWM6-28SPWMDC-AC

  • PWMPWMPWM6-29PWMPWMSPWM


6 dc ac

  • PWMPWM


6 dc ac

  • fc fr

    pPWM


6 dc ac

  • frfc1/4

  • pp


6 dc ac

  • ppSPWM3,p

  • PWM


6 dc ac


6 dc ac

  • 3)Modulation Index

  • Modulation Index

  • MI

  • V1Vin


6 dc ac

3SPWM

1(Natural sampling)

  • SPWMSPWM

  • SPWM

  • MI().

  • 6-30n

6-26


6 dc ac

6-30


6 dc ac

  • n

  • k

  • tAtB


6 dc ac

2(Regular sampling)

  • Asymmetric regular sampling(Symmetric regular sampling)6-31


6 dc ac

6-31


6 dc ac

  • 6-316-32PWM6-33

6-32 kPWM


6 dc ac

6-33 kPWM


6 dc ac

  • 6-32

  • 6-326-33PWM

  • PWM


6 dc ac


6 dc ac

  • kPWM

  • kPWM

  • Asymmetric modulation

  • Symmetric modulation

  • PWM


6 dc ac

  • kPWM

  • kPWM

  • Symmetric modulation

  • PWM PWM


6 dc ac

  • 6-34


6 dc ac

6-34


6 dc ac

  • SPWM120o


6 dc ac

  • SPWM


6 dc ac

  • PWMkPWM


6 dc ac

  • PWMp

  • 6-35 6-35

    • (depth of modulation) ormodulation index

    • clusters

  • side-bands

  • p<10


  • 6 dc ac

    6-35 SPWM


    6 dc ac

    • 391521276-36

    6-36 AB


    6 dc ac

    • 2p-16-35B,THD

    • ppTHDpTHD


    6 dc ac

    • 3SPWM

    • NN


    6 dc ac

    • NN Vdc/2V1mK KKSPWM6-37NKSPWM

    6-37SPWM


    6 dc ac

    • K:


    6 dc ac

    • NNN

    • K

    • K+1

    • N


    6 dc ac

    • SPWMNG6-19120oRY

    • 0.866


    6 dc ac

    • MI1 6-39

    6-39

    SPWMPWM


    6 dc ac

    urU

    urV

    uc

    urW

    u

    O

    w t

    uUN

    O

    w t

    uVN

    Ud

    2

    O

    w t

    -Ud

    2

    uWN

    O

    w t

    uUV

    O

    w t

    Ud

    2

    uUN

    3Ud

    2

    O

    w t


    6 dc ac

    3

    • LCKm

    • 1) K

    • 6-40Z1Z2

    6-40


    6 dc ac


    6 dc ac

    • bab=0b


    6 dc ac

    • xy

    • g


    6 dc ac

    • b

    • Z1Z2


    6 dc ac

    • Z1Z2

    • Z1Z2KK

    • fc


    6 dc ac

    • b


    6 dc ac

    • LCfc2

    • R

    • Zc1Zc2 RL


    6 dc ac

    • 2m

    • 6-42

    6-42


    6 dc ac

    • mKZc1mZcm1

    • Z2m


    6 dc ac

    6-43 m


    6 dc ac

    • m


    6 dc ac

    • m [fc, ]mK


    6 dc ac

    • 1 320V,

    • 2 UnipolarPWM(Bipolar)PWM

    • 3

    • 4 Modulation Index

    • 5 200V

    • 1

    • 2

    • 66


    6 dc ac

    • 7

    6

    7


    6 dc ac

    • 8 8

    • 9 6-10a

    8


    6 dc ac

    • 10 6-18120

    • 11 6-18180

    • 12 Q1Q4Q2Q3TS/4Q1Q2

    • 13

    • 14

    • 1515 LC


    6 dc ac

    15


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