line-commutated rectifiers
DESCRIPTION
A tutorial to understand Rectifiers.TRANSCRIPT
Line-Commutated Rectifiers(Phase-Controlled Rectifiers)
Power Electronics Line-commutated Rectifiers1
Outline
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1.The single-phase bridge rectifier● continuous conduction mode● discontinuous conduction mode
2.The three-phase bridge rectifier● continuous conduction mode● discontinuous conduction mode
3.Some issues in rectifiers● phase control● inverter mode● transformer connections
4.The concept of power and harmonics innonsinusoidal systems
The single-phase bridge rectifier
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Continuous conduction mode
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Discontinuous conduction mode
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Example
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The Three-Phase Bridge Rectifier
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Continuous conduction mode
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A typical CCM waveform
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Discontinuous conduction mode
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Phase control
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DC output voltage vs. delay angle α
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Inverter mode
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Transformer connections
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Twelve-pulse rectifier
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Waveforms of 12 pulse rectifier
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Rectifiers with high pulse number
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Power And Harmonics in Nonsinusoidal Systems
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Average power in terms of Fourier series
RMS value of a waveform Power factor
THDDistortion and Displacement factors
Power phasors in sinusoidal systemsAC line current harmonic standards
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Average power
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Energy transmitted to load, per cycle
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Evaluation of integral
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Example 1
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Example 2
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Example 3
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Example 3
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Root-mean-square (RMS) value of a waveform, in terms of Fourier series
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Power factor
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Linear resistive load, nonsinusoidal voltage
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Nonlinear dynamical load, sinusoidal voltage
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Distortion factor
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Distortion factor vs. THD
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Power phasor in sinusoidal systems
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Example: power phasor diagram
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Reactive power Q
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Lagging fundamental current of phase-controlled rectifiers
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Harmonics and power factor
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Real and reactive power in controlled rectifier at fundamental frequency
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AC line current harmonic standards
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● International Electrotechnical Commission Standard 555
● IEEE/ANSI Standard 519
Line-Commutated Rectifiers
International EletrotechnicalCommission Standard 555
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IEEE/ANSI Standard 519
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IEEE-519 current limits, low voltage systems
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IEEE-519 current limits, high voltage systems
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IEEE-519 voltage limits
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