Integrating renewables into the Japanese power
grid by 2030
A frequency stability and load flow analysis of the japanese system in response to highrenewable penetration levels

Tokyo, 17.12.2018, Peter Merk

Objectives of the Study•

Establish a reusable, sustainable and transparent tool chain for future use•

Assessment of different Scenarios for Japan 2030••

Governmental Scenario•

Higher RES Scenario

Evaluate further possibilities for renewables in order to facilitate renewable integration•

Ancillary service participation•Frequency stablity participation•

Publication of the Grid Model•

Deriving recommendations and conclusion for different Stakeholders in the Japanese power sector and encouage thepublic discussion.

Elia Grid International

2

Frequency Curves without FFR
Frequency curves over time after load of 1,5 GW generation
60.500Without FFR

Frequency in Hz.

60.00059.50059.000Frequency nadir is at
58.6 Hz below criticalthreshold of 58.8Hz

58.50058.00057.500
0Elia Grid International

51015202530
Time in sec.

3540

45503

Over comming Frequency Issues
Fast Frequency Response (FFR) is a super fast (<1s) ancillary service provides/consumes power in cases of gridfrequency deviations.
FFR Test in Ireland 2017, Enercon wind trubine•In general the service can be provided bymany different technologies, including
wind, solar, batteries, demand side responseor synchonious condensors.

•In many power systems, especiallyelectically isolated systems this is alreadystate of the art. This includes for example
the UK, Ireland, Texas (Ercot / US).

Elia Grid International

4

Frequency Curves with FFR
Frequency curves over time after load of 1,5 GW generation
60.500With FFR
Without FFR

Frequency in Hz.

60.00059.50059.000Shifting the freqeuncy
nadir above criticalthreshold to 59Hz byusing 250MW FFR
from VRES

58.50058.00057.500
0Elia Grid International

51015202530
Time in sec.

354045505

How far can we go considering FFR and stability limits?
1945

Frequency Nadir in p.u.

49
70,99

23
45
650,98West
East+720,970,960,950

Elia Grid International

1020304050
VRES Share in %

60

70806

How is the grid loading affected impling higher shares of RES?
More renewables don’t necessarily mean more congestions – Location is Key

EPCO Region

KyushuChugokuKansai
Hokuriku
Chubu
ShikokuTohokuTokyoElia Grid International

Loading Tendency

Western Synchronous Area
Increasing
Increasing
Decreasing
Decreasing
Decreasing
Increasing
Eastern Synchronous Area
Increasing
Decreasing

7

Recommendations
Volatile Renewable Energy Source such as wind and solar PV can be part of the ancillary service
concept in transmission and distirbution grids. However all sides need to work together to make thishappen:
Policy and regulating bodies• Implement a non-discriminated framework for renewable integration
System Operators• Make renewables part of the ancillary services concepts. Use them as competitive technology in order toreduce costs for ancillary service procurement.
Renewable Developers• Anticipate requirements needed for grid services and explore further services renewables can provide

Elia Grid International

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Elia Grid International
www.eliagrid-int.com
info@eliagrid-int.com

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