ECE 551
Smart Electric Distribution
Systems
North Carolina State University
Department of Electrical and Computer Engineering
Spring 2015
Homework Three
K Factors and Overhead Line Modeling
Due Feb. 5, 2015
Problem One (10 points)
The rectangular area in
ECE 551
Smart Electric Distribution
Systems
North Carolina State University
Department of Electrical and Computer Engineering
Spring 2015
Homework Two
Transformers
Due Jan. 27, 2015
Problem One (10 points)
A 12470GndY/7200-120/240, 15 kVA single-phase tra
Photovoltaic Technologies
ECE 452/552 Renewable Energy Systems
Spring 2015
Jeffrey L Harmon
jlharmon@ncsu.edu
U.S. PV Installations
+50%
GTM Research/SEIA: U.S. Solar Market Insight
Technologies and Percent Global Sales*
poly-Si (multi-crystalline)
c-Si (
1. Fig. 1 shows a boost converter cascaded by a buck converter. The
switches S and S are ON during dTS and (1 - d)TS respectively.
Fig. 1. A Boost Converter and Buck Converter in Cascade
(A) Evaluate the steady state currents in L1 and L2 in terms of Io a
ECE 551
Smart Electric Distribution
Systems
North Carolina State University
Department of Electrical and Computer Engineering
Homework Four
Cable Modeling and Voltage Regulators
Due Feb. 12, 2015
Spring 2015
Problem One (15 points)
A 1/0 aluminum concentr
ECE 516: System Control Engineering
This course focuses on the analysis and design of systems control. This course will introduce
time-domain systems dynamic control fundamentals and their design issues for electrical
engineering applications. Emphasis wi
Photovoltaic Technologies
ECE 452/552 Renewable Energy Systems
Spring 2015
Jeffrey L Harmon
jlharmon@ncsu.edu
U.S. PV Installations
+50%
GTM Research/SEIA: U.S. Solar Market Insight
Technologies and Percent Global Sales*
poly-Si (multi-crystalline)
c-Si (
ECE 551
Smart Electric Distribution
Systems
North Carolina State University
Department of Electrical and Computer Engineering
Spring 2015
Homework One
Load Characteristics
Due Jan. 20, 2015
Problem One (10 points)
Table 1 below contains 15-minute kW deman
Cn = C0 * (1 + r)
C0 =
Cn
(1 + r/t)tn
n
Cn
= C0 (1 +
r)n
1. With r = 7%, calculate the future value of $1,500 at the end of each year for 3 years.
Cn = $1,500 * (1.07)1,2,3
$1,605, $1,717.35, $1,837.56
2. You want to have $25,000 in 5 year's time. As a on
Name _
ECE 453/592
Practice Exam
Problem 1 (20 Points) _
Problem 2 (20 Points) _
Problem 3 (20 Points) _
Problem 4 (20 Points) _
Problem 5 (20 Points) _
Total (100 Points) _
THIS IS CLOSED BOOK, CLOSED NOTES, 75 MINUTE EXAMINATION
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