IEEE Power & Energy Magazine - November/December 2020 - 52
Model A
Model B
50%
30%
Model C
20%
(c)
(a)
(b)
(d)
figure 7. An improvement of the PV generation forecast. (a) Satellite insulation data. (b) Historical pattern matching. (c) The
weights for each model. (d) The historical (red line) and 3-h (yellow line) predictions. JST: Japan Standard Time. (Source:
-Kyushu EPCO; used with permission.)
times/days that restrictions are imposed on each unit. When
automated, the limitation orders are sent to on-site PV control systems, or the systems download published curtailment
schedules. If the control of a PV unit is not automated, the
curtailment orders and schedules are sent to an on-site system
manager who is responsible for the
oversight of the PV unit, according
to the law.
sary, using the latest available intraday forecast. Through the
improvement, in terms of economy, the expected amount of
curtailment decreases by the reduction of the target restriction. In terms of security, potential undercurtailment, as a
result of the day-ahead orders, is treated, if necessary, by the
Curtailment by System
Operation Using the
Average Forecast Error
52
ieee power & energy magazine
Dispatch Order
(2 h Before)
Generation Output
Since autumn 2019, the renewable
generation curtailment procedures
have been improved (Figure 13).
The target amount of curtailment,
which was previously calculated
based on the historical maximum
forecast error for the same month,
is now determined based on the
historical average forecast error
for the same month. Offline units
are issued limitation orders 1 day
in advance, whereas the online
units, to make the best use of the
online-controlled PV units, are
given restriction directives 2 h
beforehand and only when neces-
Dispatch Order
(2 h Before)
Dispatch Order
(2 h Before)
Dispatch Order
(2 h Before)
Time
Fourth Axis
Parallel In
Third Axis
Second Axis
Parallel In
First Additional Axis
Parallel In
Minimum Generation
Parallel In
Output From CCGT Power Plants
15 min
15 min
15 min
15 min
figure 8. Starting combined-cycle gas turbine (CCGT) axes during a ramp-up of the
residual demand during the evening of 30 April 2018. (Source: Kyushu EPCO; used
with permission.)
november/december 2020
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
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IEEE Power & Energy Magazine - November/December 2020 - Cover3
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