MARTENSEN – DE – Session 4 – 1221

Frankfurt (Germany), 6-9 June 2011

MARTENSEN – DE – Session 4 – 1221

The Cell Controller Pilot Project (CCPP):From Surviving System Black-Out

to Market Support

Energinet.dk Spirae Inc Energynautics GmbH SE


CCPP: Background

Blackout experience due to transmission system failure

Large amount of Distributed Energy Resources in Denmark

Further increasing share of renewable energy sources in the future



Surviving transmission system black-outby safely transitioning into island operation

TSO support: Virtual Power Plantsfor active and reactive power

independently DNO Support: Advanced voltage control Platform for market aggregators

of distributed generation resourcesMARTENSEN – DE – Session 4 – 1221

CCPP: Objectives


60 kV grid cell below one 150/60 kV transformer 13 each 60/10 kV substations with tap changer

controlled transformers

5 CHP plants / 15 synchronous generators, total installed capacity of 32.5 MW

47 Danish-style wind turbines, total installed capacity of 37 MW

Rural area, villages and small cities (>1000 km²)MARTENSEN – DE – Session 4 – 1221

CCPP: The Pilot Cell


Started in 2005 Field Tests with reduced-sized Cell in 2008

Grid-connected and island functions

Field tests using the entire Cell in 2010 Grid-connected functions

Final field tests using the entire Cell in 2011 Grid-connected and island functions


CCPP: Project Status


To be used by Power Balance Authorities Group and dispatch of CHPs or Wind Turbines Multiple Markets:

Day-ahead scheduling Merit order dispatch based on price information Up-regulation and down-regulation

Automatic dispatch validation against power system/component limits


CC Functions: Market Operations


Conventional distribution systems use only transformer tap changers for voltage control.

The Cell Controller uses reactive power setpoints of distributed energy resources first, where available. Reduced wear on tap changers Smoother voltage for consumers and generators


CC Functions: DNO Voltage Control


Controlled load flow at single point of connection Active Power VPP

Automatic asset dispatch to meet setpoint Disables Market Operations

Reactive Power VPP Uses assets dispatched by other means Reduces voltage control to tap changer control

Consideration of local system/component limitsMARTENSEN – DE – Session 4 – 1221

CC Functions: TSO Virtual Power Plants


Based on receipt of external trigger signal Balance load and generation

Load/generation shedding if necessary

Open the Cell circuit breaker (within <5 seconds) Automatic voltage & frequency control in island Automatic load restoration Resynchronization


CC Functions: Emergency Island



Field Tests 2010: DNO Voltage Control

Blue: DNO Preferred Operating Voltage Ranges (and changes)

Red: Nominal Voltage Set Point and Actual Values

Holsted CHPGenerator ReactivePower Production



Field Tests 2010: Reactive Power VPP

TSO operator request reactive power set point of -7 MVAr

Measured reactive power

TSO reactive power import/export disabled

Tap changer operations at different 60/10 kV substations



Field Tests 2010: Active Power VPP


All originally envisioned functions implemented and tested in simulations and in the field

Grid-connected functions working in 2010 Minor improvements for 2011

Grid-connected functions comprehensively field tested in May 2011 with success

Island functions to be field tested in June 2011


Conclusions


Cell Controller Pilot Project is concluded with final field tests 2011.

Possible further deployment of the Cell Controller system on the island of Bornholm

Future distribution systems will provide further/improved distributed control resources that can be utilized by the Cell Controller.


Outlook

Documents

MARTENSEN – DE – Session 4 – 1221