作者twns (twns)
站内NTUEE_POWER
标题[问题] 电力电子
时间Tue Nov 24 19:11:13 2009
※ [本文转录自 Electronics 看板]
作者: twns (twns) 站内: Electronics
标题: [问题] 电力电子
时间: Tue Nov 24 16:53:43 2009
1. Estimate dominant harmonic components
(to three times of the switching frequency) of both phase and line voltages
for a three-phase voltage source inverter by using Bessel approximation.
Assume the DC bus voltage is 400V, the fundamental and switching freguency are 50Hz and 1050Hz, respectively.
2. Voltage and cueeent in a three-phase four-wire system are given as follows:
Va(t)=100 cos(wt+20) Ia(t)=10 cos(wt)
Vb(t)= 80 cos(wt+100) Ib(t)=12 cos(wt+60)
Vc(t)=120 cos(wt-100) Ic(t)= 8 cos(wt-60)
A. Use symmetrical component transformation to derive positive,negative,
and zero sequence components for both voltage and current, and calculate
complex power.
B. Derive voltage space vector, current space vector, and calculate
complex power by using space phasor method.
3. For the following three-phase voltage
Va(t)=100 cos(wt)
Vb(t)=100 cos(wt-180)
Vc(t)=0
A. Derive Vs,qd? <===========定子的Vqd
B. Derive Ve,qd (转子的Vqd) in the positive-sequence rotational frame (w)?
C. Derive Ve,qd (转子的Vqd) in the negative-sequence rotational frame (-w)?
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