論点１
à ⽇本のFlexibilityの現状は︖
à 再エネ⼤量導⼊に向けて、どのような展開を⾒据えるべきか︖

関⻄電⼒送配電再エネ⼤量導⼊を⾒据えた現状 〜想定される課題と現在の解〜 2
TSO視点
基幹系・全系レベルで再エネ特性への対応が必要- 間⽋性︓スケール（線路単位、地域単位、ノード単位等）によって異なる課題
周波数維持や電圧、系統安定性なども課題- 時限性︓いわゆる“ダックカーブ”の課題
周波数維持や電圧、系統安定性なども課題 ・基本は調整⼒による対応
・Flexibilityの概念に近いの- 偏在性︓特定の系統にのみ⽣じる系統混雑の課題
はノンファーム接続くらいかè 現在の解：調整力電源による調整、ノンファーム接続、N-1電制、出力抑制…
DSO視点
6kVクラスの再エネへの対応・メッシュ状系統を前提とした検討が必要- 間⽋性︓電圧変動（過昇）、系統の混雑管理が課題- 時限性︓ （ 同上 ）- 偏在性︓ （ 同上 ）Flexibility的要素は、ほぼ存在しないè 現在の解；電圧変動： 電圧監視と電圧調整器による制御
系統混雑： 系統切り替え、系統増強、出力抑制
Kansai Transmission and Distribution,Inc.

カーボンニュートラル実現レベルの再エネ⼤量導⼊で想定される課題 3
TSOが採る対策・⾏動（想定）- 周波数︓
全系レベルで再エネの間⽋性に追随、対応- 電圧・安定度︓ 線路や地域単位でFlexibilityを活⽤- 系統混雑︓（ 同上 ）
DSOが採る対策・⾏動（想定）- 電圧︓
街区レベルや配電線区間単位でFlexibilityを活⽤- 系統混雑︓（ 同上 ）
Flexibility Resourceの必要量が確保できない恐れ

TSOとDSOの視点で、求めるFlexibilityが若⼲異なる・Flexibilityが必要な地域の違い
・必要なFlexibilityの⽅向（上げ／下げ）と⼤きさの違い
・Flexibilityが必要な時間の違い

TSO／DSO間でのFlexibilityのバッティングが⽣じる恐れ

課題①
TSO/DSO間で、Flexibilityをどのように調整して活⽤するか︖
課題②
再エネ“⼤量”導⼊に対して⼗分なFlexibility Resourceをどう確保するか︖
課題③
必要な地域・locationで必要な量のFlexibility Resourceをどう確保するか︖
Kansai Transmission and Distribution,Inc.

諸課題に対する⽅向性

4

課題①︓TSO/DSO間の調整- TSO/DSO間の連携強化- Flexibilityの“⾒える化”、統合プラットフォームなどの環境整備
è データ利活用や“プラットフォーム”の議論など、関連する動きはある
課題②︓⼗分なFlexibility Resourceの確保- 現時点からFlexibility Resource活⽤の意識づけと利活⽤促進
è 調整力市場へのDRの参画や、アグリゲーターの活性化など動きはある
課題③︓必要な地点での必要な量のFlexibility Resourceの確保- 再エネ適地や系統の脆弱箇所の⾒極め（Flexibilityが必要な箇所の⾒極め）- Flexibility Resourceの対象資源の拡⼤と必要な地域への設置誘導è 現時点で具体的な解や動きが見当たらない…

Kansai Transmission and Distribution,Inc.

Theme 1
à What about the current status of Flexibility in Japan?
à What kind of evolution should we consider
in terms of mass deployment of RES in Japan?

KANSAI Transmission and Distribution

Current Status –Prospected Challenges and Current Solutions-

6

TSO point of view
Required to cope with RES as bulk system/whole system- Intermittency
challenges varies in terms of scale, location, area, nodes
maintain frequency, voltage problem and system stability are also challenges- Time domain matter“Duck Curb” problem
maintain frequency, voltage problem and system stability are also challenges- Localization- Basically frequency
congestion problems on specific lines/areas only
adjustment only-similar to Flexibility is only
Non-firm.

è Current Solution;
adjustment power, non-firm connection, N-1 restriction, generation suppression…

DSO point of view
Taking 6kV class RES and mesh-like grid into consideration- Intermittency: Voltage and congestion problems- Time domain matter: (the same as above)- Localization: (the same as above)
There is nothing about “Flexibility”.

è Current Solution;
Voltage fluctuation: SCADA and voltage control
Congestion: grid switching, reinforcement, generation suppression

Kansai Transmission and Distribution,Inc.

Prospected Challenges –Mass RES deployment for Carbon Neutral-

7

Action on TSO side
- For frequency: Cope with intermittency as whole system level- For voltage/stability: Utilize Flexibility on lines/areas- For Congestion:(the same as above)
Action on DSO side
- For Voltage: Utilize Flexibility on city block/feeder- For Congestion: (the same as above)
Concern;

Lack of volume

Required Flexibility is different from TSO & DSO.
- Required location/area- Required direction (up/down) and volume- Required time of the day/week

Concern;
Conflict about Flexibility
between TSO & DSO

Challenge-1
How to manage/utilize Flexibility between TSO & DSO?
Challenge-2
How to ensure enough volume of Flexibility Resources?
Challenge-3
How to ensure Flexibility Resources on the required location/area?
Kansai Transmission and Distribution,Inc.

Actions for Challenges

8

Challenge-1: Harmonization between TSO & DSO- Strengthen relationship between TSO & DSO- Ensure visibility of Flexibility, set up Integrated Platformè Related/similar movement, such as Data Utilization, “Platform”, etc.
Challenge-2: Ensure enough volume of Flexibility Resource- Enlightenment/Enhancement of Flexibility Resource utilization
è Related movement, such as DR participation to Adjustment Market,

growing Aggregators
Challenge-3: Ensure Flexibility Resource on required location/area- Find out required location/area, such as RES favorable are,vulnerable point of grid, etc.
- Expand Flexibility Resource, Induction resources to required
location/area

è There is no comprehensive solution and actual movement…
Kansai Transmission and Distribution,Inc.