Question

Problem 8.3

A single-phase diode-clamped inverter has m = 5. Find (a) instantaneous, average, and rms currents of each node, and (b) average and rms capacitor current if Vdc = 5 kV and io = 50 sin1θ - π/32

Answer #1

A single-phase full-bridge inverter has RLC load of R = 4 ? and
L = 35 mH
and C = 155 ?F. The dc input voltage is 230 V and the output
frequency is 50 Hz.
(a) Find an expression for load current up to fifth harmonic.
(b)Calculate rms value of fundamental load current
(c) The power absorbed by load and the fundamental power
(d)The rms and peak current of each IGBT
(e) Conduction time of IGBTs and diodes if...

Problem 2. A three phase transformer rated at 5 MVA, 115/13.2 kV
has a per phase series impedance of 0.007 + j0.075 per unit (shunt
parameters are ignored). The low voltage side is connected to a
short distribution line which modeled by a series per phase
impedance of 0.02 +j0.1 per unit on the base of 10 MVA. The line
supplies a balanced three phase constant impedance load at 4 MVA,
13.2 kV with power factor of 0.85 lagging
•...

1. In which phase of the business cycle is the U.S. economy
currently in? ________________. How many months has the U.S.
economy been in this stage of the business cycle? ___________
months 2. How long has the current expansion/recovery lasted to
date? _________________ How does this compare to the average length
of U.S. recessions since 1854? ______________________________. 3.
What do the last four recoveries/expansions (that is, the current
recovery/expansion and the previous three recovery/expansions),
suggest about a new trend in...

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