IEEE Electrification - December 2020 - 66
Typical Day 4: Off-Grid Operation
The purchasing power is reduced by 20.53% (from
54,634 to 43,413 kWh), and the corresponding power purchase cost is reduced by 30.27% (from ¥33,235 to ¥23,175).
In addition, the maximum power demand is reduced by
36.28% (from 1,061 to 676 kW) with the help of demand
response and energy-storage devices.
The system has two off-grid operation modes: active and
passive, so as to ensure uninterrupted power supply for
important loads. In the active off-grid model, the EMS system adjusts the load source storage state in the microgrid
according to the load, PV, and energy-storage status until
Typical Day 1: The Day With High PV Outputs
1,200
1
800
0.8
600
0.6
400
0.4
200
0.2
0
Price (¥/kMW)
Power (MW)
1,000
0
-200
.
m
0
:0
12
10
8:
:0
0
a.
m
p.
p.
00
p.
00
.
.
m
.
m
.
6:
00
p.
m
.
4:
00
p.
m
.
2:
:0
0
p.
m
.
12
10
8:
:0
0
a.
m
.
a.
m
.
00
a.
m
.
00
6:
4:
00
a.
m
.
m
a.
00
12
2:
:0
0
a.
m
.
-400
Time
PV Output
Storage
Tie Line
Load
Maximum Power on Tie Line
Price
Figure 13. The operation curves of typical day 1.
Typical Day 2: The Day With Low PV Outputs
1,200
1
800
0.8
600
0.6
400
0.4
200
0.2
0
0
-200
Time
PV Output
Storage
Tie Line
Figure 14. The operation curves of typical day 2.
66
I E E E E l e c t r i f i cati o n M agaz ine / DECEMBER 2020
Load
Maximum Power on Tie Line
Price
a.
m
.
12
:0
0
p.
m
.
10
:0
0
m
.
8:
00
p.
p.
m
.
6:
00
p.
m
.
4:
00
p.
m
.
2:
00
p.
m
.
a.
m
.
12
:0
0
8:
00
10
:0
0
a.
m
.
m
.
6:
00
a.
m
.
4:
00
a.
a.
m
.
2:
00
12
:0
0
a.
m
.
-400
Price (¥/kMW)
Power (MW)
1,000
IEEE Electrification - December 2020
Table of Contents for the Digital Edition of IEEE Electrification - December 2020
Contents
IEEE Electrification - December 2020 - Cover1
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https://www.nxtbook.com/nxtbooks/pes/electrification_june2022
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2021
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https://www.nxtbook.com/nxtbooks/pes/electrification_june2021
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2020
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2019
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2018
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https://www.nxtbook.com/nxtbooks/pes/electrification_december2017
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