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1
Smart Grid System by Sumitomo Electric
March 5, 2015
Sumitomo Electric Industries, Ltd
2
Main Products of Sumitomo Electric
Automotive Communications
Electronics Energy
Industrial Materials
3
Technology potential of SEI group
4
Redox Flow Battery
5
Roles of Large Battery System
1) Load leveling or peak shifting
Charging electric power during off-peak hours,
and supplying it from a battery during on-peak hours
2) For emergency
Backing up the power on emergency
for a building, factory, town, …
3) Stabilization of power grid
Stabilizing fluctuations of solar power or wind power by charging and discharging
with a battery
Solar power
Wind power
Charge
Discharge
battery
Output power
dem
and [
MW
h]
Time
dem
and [
MW
h]
Time
6
SEI is a pioneer of a RF battery
and holds the highest technology in this field.
Principle
・Using the charge-state differences of vanadium ions dissolved in sulfuric acid.
・In charging mode: V+4 → V+5 at positive electrodes, V+3 → V+2 at negative electrodes.
Merits
・Long lifetime (20 years)
・Safe (no risk of burning)
・No limitation for charging and discharging cycles (Quick response for charge/discharge)
・Easiness in scale up of charging capacity (V acid tank) up to any volume
・Accurate detection of SOC (State of Charge)
Weak points
・Relatively large
Mechanism of Redox Flow (RF) Battery
7
SEI’s Micro Smart-grid System (off grid)
8
Overview of Power Generation/Storage System
Redox flow battery Concentrator photovoltaic
SEI Yokoyama Works
■Concentrator photovoltaic
Max. power generation:
100 kW (7.5 kW x 15 units)
■Redox flow battery
Max. output: 1 MW
Capacity: 5 MWh
■Energy management system
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Operation Modes of the System
Noon Night Morning Evening
Ele
ctr
icity
Consumed
Received
Solar power
Scheduled output
(solar + battery)
Charging electric power during
off-peak hours and supplying
electric power from RF battery
during on-peak hours
Load leveling or peak shifting
Stabilizing fluctuations of solar
power by charging/discharging
RF battery
- Reducing dependence
on thermal power plants
- Increasing introduction
of green energy sources
Combination use of solar power
and RF battery enables scheduled
power generation regardless of
the weather
Enhancing the value
of solar power generation
Genera
ted e
lectr
icity
Solar
power
Balanced output
(solar + battery)
Noon Morning Evening Noon Morning Evening Genera
ted e
lectr
icity
Load levering Peak shaving
Stabilizing fluctuation Scheduled power
generation
10
-20
0
20
40
60
80
100
120
6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
出力
(kW
)
CPV output
Redox Flow Battery Mixed output as scheduled
Example of Scheduled Power Generation
Time
Ou
tpu
t P
ow
er
(kW
)
11
Control
center
Charge
Discharge
Frequency
Solar power
Wind power Hokkaido
● ● Yokohama
Osaka
RF battery
Stabilization of frequency
of output power
METI project Location : Minami-Hayakita transformer substation of Hokkaido Electric Power RF battery : Max. output = 15 MW Capacity = 60 MWh Project period : from 2013 to 2017 Developing technology item : ・Frequency stabilization ・Adjusting of power balance under dump power Electrolyte tank
Stacked cell bank
Site area : 5,000 ㎡
Large-scale RF Battery Project at Hokkaido Electric Power
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Concentration Photovoltaic (CPV)
13
Features of Concentrator Photovoltaic (CPV)
Fresnel lens
PV cell
(compound semiconductor)
CPV
Si-PV
50
40
30
20
10
0
Ce
ll e
ffic
ien
cy
(%)
1980 1990 2000 2010
CPV
Si-PV
Higher power generation is possible by high-efficiency and temperature-stable cells.
14
AM
Si-PV CPV
Features of CPV System
PM
High power generation efficiency
(twice that of crystal Si panels)
It requires smaller panel area.
Space under the panels available for
various use
High energy generation
from the morning to the evening
by a sun tracking system
15
CPV output
Fixed Si-PV
output
DNI
Outp
ut P
ow
er
(kW
/m2)
D
NI (k
W/m
2)
Power Generation of CPV and Si-PV
Data from Field Test in Morocco
16
Power Output of CPV and Si-PV
0
20
40
60
80
100
120
140
160
180
200
220
240
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
6:0
0
7:0
0
8:0
0
9:0
0
10
:00
11
:00
12
:00
13
:00
14
:00
15
:00
16
:00
17
:00
18
:00
So
lar
Irra
dia
tio
n (
W /
m2)
Time
Ou
tpu
t P
ow
er
(W / m
2)
Output
(horizontal Si-PV)
Output (CPV)
Direct normal
Global horizontal
Data from internal demonstration in Osaka Japan
17
Overview of SEI’s CPV Panel
Thin・Light Weight
Lower Cost Installation・Transportation
Can Be Carried by 1 Person Increase the Load Capacity
Suppress Temp Rise Large Lens
High Efficiency
Light Dispersion Suppress Cell Temp Rise
Compact Lens
High Reliability
Long–Term Reliability
Harsh Environment
18
SUMITOMO ELECTRIC Ingenious Dynamics
SEI’s CPV as a Display
19
DC/DC Converter
CPV Units are DC-Linked through DC/DC Convertor. ⇒Maximum Power Point Tracking (MPPT) ⇒ Managing Power Generation and Operation Conditions Individually
Max. Power Output 7.5 kW/unit
Panels 64 Panels /unit
Weight <10kg /panel
Energy Generation ー CPV
Recommended