IEEE Power & Energy Magazine - November/December 2020 - 54
table 3. The PV units and the number of systems with online renewable
generation curtailment for demonstration.
Target
Capacity
Installations
in Fiscal
Year 2015
Installations
in Fiscal Year
2016
Installations
in Fiscal
Year 2017
Capacity
Accumulated
in March
2017
66 kV or
fewer
390 (20)
72 (2)
110 (3)
204 (14)
386 (19)
Fewer than
66 kV
10 (1)
3 (2)
0 (0)
5 (1)
8 (3)
Total
400 (21)
75 (4)
110 (3)
209 (15)
394 (22)
Category
Impact of a Large
Forecast Error
The table entries show megawatts, with the number of systems in parentheses. (Source:
Kyushu EPCO; used with permission.)
table 4. The PV systems in Kyushu.
Offline Manual Control
(Old-Rule Units)
Online Automatic Control
(New-Rule Units)
66 kV and above
47 units
730 MW
26* units
470* MW
Medium
voltage
≥500 kW
2,000 units
2,340 MW
312 units
340 MW
<500 KW
2,000 units
400 MW
402 units
90 MW
Low
voltage
≥10 kW
6,300 units
1,750 MW
25,000 units
840 MW
<10 kW
29,700 units
1,330 MW
74,000 units
410 MW
The pink zones show targets for renewable generation curtailment, as of June 2019.
(Source: Kyushu EPCO; used with permission.)
*These figures include 19 units of 400 MW under the old rule.
2-h-ahead -restriction of additional
online units. This improvement is
expected to reduce the maximum
capacity of each curtailment operation by 9%.
On 2 March 2019, the Kyushu
area experienced an extreme PV
forecast error (overgeneration). As
depicted in Figure 14, the actual
PV generation was 3.5 GW lower
than had been forecast at 10 a.m.
the previous day, whereas the
demand was 0.9 GW higher than
what was expected. To cope with
the total 4.4-GW gap between
demand and supply that resulted
from the forecast error, at 9 a.m. on
the day of the event, when the system operation revised the schedule, 0.81 GW of the scheduled PV
curtailment and 2.26 GW of the
scheduled PSH operation were
canceled. Instead, 1.5 GW of PSH
generation was scheduled. Moreover, 1 GW of thermal generation
was requested by the operator.
PV Generation Monitoring Display
A Large Display for Monitoring
Current PV Generation
Curtailment Display
Calculates the Necessary Amount of
Renewable Generation Curtailment
Using Forecasted Supply/Demand
Balance and Renewable Generation
Power
Curtailment Monitoring
and Control Display
Calculates the Future Renewable
Generation Power Based on the
Latest Weather Data
Supply and Demand
Monitoring Display
Monitors the Current-Day
Renewable Energy Power
Generation Curtailment and
Supply/Demand Conditions
figure 11. The renewable generation management system in the load-dispatching room. (Source: Kyushu EPCO; used
with permission.)
54
ieee power & energy magazine
november/december 2020
IEEE Power & Energy Magazine - November/December 2020
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