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MD变频器.ppt

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MD变频器.ppt
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Three-phase bridge inverter,Synthesis of voltage waves in bridge inverter,(a)Output phase voltage and current waves assuming perfect filter (b)input dc current wave,Principle of dual bridge 12-step inverter (bypass diodes omitted),串联三相二重12脉冲逆变器,串联三相三重18脉冲逆变器,并联三相多重逆变器 (中心抽头电抗器方式),并联三相多重逆变器 (并联多重变压器方式),Principle of sinusoidal pulse width modulation (generation of control signals),Principle of sinusoidal pulse width modulation (modulated waveform for p = 6 ),Sinusoidal pulse width modulation,Va,,VT,Vb,Harmonic content of the sinusoidal PWM voltage as a function of modulation index (a) harmonic amplitude relative to maximum fundamental amplitude,Harmonic content of the sinusoidal PWM voltage as a function of modulation index (b) harmonic amplitude relative to actual fundamental amplitude,Relation of fundamental frequency with carrier frequency of transistor inverter,Pulse width modulation with uniform sampling,Harmonic elimination method (1),Voltage wave in harmonic elimination method,Harmonic elimination method (2),Harmonic elimination method (3),Harmonic elimination method (4),Harmonic elimination method (5),,Notch angle relation with fundamental output voltage for 5th and 7th harmonic elimination,PWM for minimum loss in motor,Dynamic braking (1),能量只在一个方向流动的变频系统,Dynamic braking (2),Dynamic braking capacity (a) PWM and (b) square-wave inverter,Dual GTO PWM inverter for bidirectional power flow,The three-phase bridge autosequentially commutated current-source inverter with a wye-connected RL road,(a) Circuit diagram; (b) (c) (d) idealized ac line current waveforms; (e) Thyristor gating sequence,Idealized voltage and current waveforms for an induction motor fed by a six-step current source inverter,,approximate induction motorequivalent circuit; (b)(c)(d) voltage and currentwaveforms,PWM current source inverter (1),,PWM current source inverter (2),电压源型与电流源型变频器主要特点比较,Current controlled PWM inverter,Current controlled pulse width modulation,Fixed-frequency PWM control,Blo
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