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Smart Grid System by Sumitomo Electric

March 5, 2015

Sumitomo Electric Industries, Ltd

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Main Products of Sumitomo Electric

Automotive Communications

Electronics Energy

Industrial Materials

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Technology potential of SEI group

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Redox Flow Battery

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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

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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

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SEI’s Micro Smart-grid System (off grid)

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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

)

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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)

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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.

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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

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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

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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

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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

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SUMITOMO ELECTRIC Ingenious Dynamics

SEI’s CPV as a Display

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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