IEEE Power & Energy Magazine - November/December 2020 - 51

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Demand and Supply (GW)

the security of the power -supply. The government of Japan, operator with the required curtailment capacity based on realKy ushu EPCO, and renewable generation operators time data for the demand and supply balance, including renew-collaborated to install an online curtailment system for able generation output. The system also provides renewable
renewable generation systems. Kyushu EPCO incorporated generation curtailment orders to generators in all voltage
online control devices for the renewable generation c-urtailment classes while maintaining fairness in terms of the number of
of 22  PV systems (394 MW in
total) to demonstrate the system's
effectiveness on the electric grid
Renewable Energy
Supply: 12 GW
throughout the year (Table 3).
12
Curtailment: 0.93 GW
Table 4 delineates Kyushu's PV
PSH: 1.84 GW
capacity of 8.7 GW through the
10
Export to Other Areas: 1.94 GW
PSH and
categories of online/offline conDemand: 7.32 GW Battery
trol and connection voltages.
PSH
8
Units totaling 4.8 GW-approxiPV: 5.5 GW
mately 60% of the total PV out6
4.8 GW
put, as shown by the pink zones-
Thermal
are currently -subject to renewable
2 GW
4
generation curtailment. Among this
Hydro, Wind, Nuclear, and
Geothermal
4.52 GW
4.8 GW of PV, a total of 1.7 GW
2
can be controlled remotely, whereas
approximately 2,000 units equal0
ing a total of 3.1 GW cannot.
Figures 11 and 12 show the
Hour of Day
renewable generation management system and its process. This figure 5. The demand and supply operation on 21 October 2018. (Source: Kyushu
arrangement provides the system EPCO; used with permission.)
table 2. The Kyushu renewable generation curtailment operation.
2018

2019

October

November

December

January

February

March

April

May

June

Number of
operations

4

44

0

1

1

16

20

10

0

Maximum
curtailment (GW)

0.93

0.93

-

0.35

0.44

1.8

2.57

1.9

-

Curtailments
per unit

5-6

8-9

(Source: Kyushu EPCO; used with permission.)

1) Weather Satellite Data

3) Past (Same Month)
Insolation Data
and Latest Changes

4) Output Prediction by Site
Past Results (Based on Eight Sites)
Improved Results (Based on 47 Sites)
Correction

Output Prediction

Satellite

2) Insolation Predictions
From 47 Sites (Increased
From Eight Sites by
Prefecture)

Insolation

figure 6. An improved PV generation output prediction. (Source: Kyushu EPCO; used with permission.)
november/december 2020	

ieee power & energy magazine 	

51



IEEE Power & Energy Magazine - November/December 2020

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - November/December 2020

Contents
IEEE Power & Energy Magazine - November/December 2020 - Cover1
IEEE Power & Energy Magazine - November/December 2020 - Cover2
IEEE Power & Energy Magazine - November/December 2020 - Contents
IEEE Power & Energy Magazine - November/December 2020 - 2
IEEE Power & Energy Magazine - November/December 2020 - 3
IEEE Power & Energy Magazine - November/December 2020 - 4
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IEEE Power & Energy Magazine - November/December 2020 - Cover3
IEEE Power & Energy Magazine - November/December 2020 - Cover4
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