IEEE Power & Energy Magazine - March/April 2021 - 73

Accordingly, the allowable intertripping amount for each
facility subject to the N−1 intertrip scheme is, in principle, set
to be an amount within the normal frequency variation range
or an amount determined by considering the reserve margin of
each utility supply area, whichever is smaller (see Table 3). If an
intertripping amount exceeds the specified allowable amount,
the transmission and distribution utility company in each supply
area needs to carefully determine an appropriate intertripping
amount considering its impact on the power system frequency,
the failure frequency of the facility subject to the N−1 intertrip
scheme, and other factors.

In terms of frequency, the intertripping amount was set to
be within the normal frequency variation range (see Table 2) to
moderate the frequency variation immediately after failure in
consideration of the frequency of a single contingency in power
system facilities. The frequency of transmission line failures is
nearly 30 times greater than generation failures in Japan. On the
other hand, in terms of reserve margin, when a large-capacity
thermal power plant is intertripped in the event of a single contingency, it takes time for reinterconnection, raising concerns
about a shortage of the reserve margin. Thus, it is also necessary
to consider the reserve margin of each utility supply area.

Transmission Line A
200 MW/CCT × Two Lines

400 MW
Relay System
Trip Signal

250 MW

G

L
50 MW

Generator
Offered to N -1
Intertrip Scheme

200 MW

Settlement for
many generation
entities is required.

Subject to
N -1 Intertrip
Scheme

The generator becomes able to access
the network without a network upgrade by
intertripping generators that connect to
a higher voltage transmission line.

G

G

G

G

G

Beneficiaries (New Generators)
(a)

How to Estimate
Actual Fuel Cost
and Start-Up Cost

Transmission
and Distribution
Companies

How to Collect
Each Payment
Demand

Induction of
Total Losses
Payment

Payment

Owner of Intertripping Generator
(Existing Generator)

Beneficiaries
(New Generator)
(b)

figure 3. The mechanism of the N−1 intertrip scheme to separate the target of intertrip from the payment.
march/april 2021

ieee power & energy magazine

73



IEEE Power & Energy Magazine - March/April 2021

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - March/April 2021

Contents
IEEE Power & Energy Magazine - March/April 2021 - Cover1
IEEE Power & Energy Magazine - March/April 2021 - Cover2
IEEE Power & Energy Magazine - March/April 2021 - Contents
IEEE Power & Energy Magazine - March/April 2021 - 2
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IEEE Power & Energy Magazine - March/April 2021 - Cover3
IEEE Power & Energy Magazine - March/April 2021 - Cover4
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