No

Table Column Head

Freq

Centrality

Notes

Appear year

1

225

0.97

power quality

2000

2

34

0.06

distributed power

2007

3

24

0.06

power distribution system

2000

4

21

0.04

reactive compensation

2003

5

17

0.05

distributed generation

2003

6

13

0.03

smart grid

2009

7

13

0.02

voltage drop

2003

8

13

0.02

voltage fluctuation

2004

9

12

0.02

voltage sag

2006

10

9

0.03

power factor

2004