Multi Phase Star Rectifier

Multiphase star rectifier By kelompok 2: Ahmad Candra ( 04 175 016 ) Dodi Candra ( 04 175 0 ) Doni kristian ( 03 175 0 )

Multiphase star rectifier • For larger (>15kW) output power. • Harmonics and fundamental component. • Filter size decreases with the increase of harmonics. • Q phase filter has fundamental component of qf frequency. • Also known as star rectifier. • Filter digunakan untuk mengurangi tingkat harmonis pada beban

Multiphase star rectifier • •

• •

May be considered as q single-phase half-wave rectifier. K-th diode conducts during the period when the voltage of k-th phase is greater than that of other phases. The conduction period of each diode is 2π/q. Primary must be delta connected to compensate the dc component flowing through secondary windings.

Assuming a cosine wave from π/q to 2π/q, the average o/p voltage is. π / q π /q 2 q q π Vdc = V cos ω t d ( ω t ) = V sin ω t = V sin ..... (1) m m m ∫ 2π / q 0 π π q 0 Output rms voltage is,  2 π /q  2 Vrms =  V cos ω t d ( ω t )  ∫0 m 2 π / q  

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 q  ω t sin 2ω t  π / q   q = Vm   + = V   m 4  0   π  2  2π

 π 1 2π    + sin   q  q 2

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..... (2)

If the load is purely resistive then peak current through the diode is Im = Vm/R and the rms current through a diode is,  2 Is =   2π

1/ 2

π /q

 1 I s = Im   2π

 (Integrating over the whole period, 2π) 2 2 ∫0 I m cos ωt d (ωt )  π 1 2π  + sin q q 2

1/ 2

  

V = m R

 1   2π

π 1 2π  + sin q q 2

1/ 2

  

=

Vs R

Vs is the rms voltage of a transformer secondary

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