DSU Modifications Séamus Power 12 November 2014 – EirGrid GCRP Meeting

Modifications 1.Performance Monitoring of DSU Dispatch Instructions (MPID257) 2.Frequency Requirements for DSUs (MPID254)

Performance Monitoring of DSU Dispatch Instructions Séamus Power 12 November 2014 – EirGrid GCRP Meeting

Actions from GCRP Meeting 11/06/2014 The DSU WG should have a maximum of two more meetings to get agreement on a mechanism. Evidence will be required of how well this mechanism works. In the absence of agreement and evidence, this existing mechanism will be proposed at the next meeting in November. A mechanism to be brought to the GCRP meeting in November for approval and reviewed again in 2016.

Performance Monitoring Timeline Jul 2013 Issues with current method highlighted at DSU workshop Nov 2013 Method proposed and feedback received Jan 2014 Updated method proposed and feedback received Mar 2014 Analysis presented Apr 2014 Method refined based on vote June 2014 Brought to GCRP. Sent back to WG Jun 2014 Alternatives proposed Jul – Sep meetings analysing 3 methods. DSUs unable to reach agreement Nov 2014 Original brought to GCRP

Best-Correlated - Including Dispatch Best-Correlated - Excluding Dispatch 10 of 10 Methods

Comments Agreement among WG members that all three methods are an improvement on the current method AE concerned that Best-Correlated - Including Dispatch is open to manipulation TSOs and other DSUs –Limited Opportunity –Level of Effort –Reputational Damage –Identifiable TSOs have committed to reviewing in 2016 EE concerned that Best-Correlated - Excluding Dispatch is not suitable for highly variable sites and regular site testing by DSUs could negatively impact baselines

Ratings Criteria Best-Correlated - Including Dispatch Best-Correlated - Excluding Dispatch 10 of 10 Accuracy Unbiased3.5 Not Open to Manipulation Clear, Transparent, Understandable and Easily Calculated Known in Advance Suitable for System with High Number of Dispatches Suitable for Sites with High Variance Ratings are the average of 4 DSU Operators based on a scale from 1 to 4 – 02/09/2014

Preferred Methods Best-Correlated - Including Dispatch Best-Correlated - Excluding Dispatch 10 of 10 Electricity ExchangeElectric IrelandActivation Energy iPowerDalkia Activation Energy

DSU Frequency Requirements Séamus Power 12 November 2014 – EirGrid GCRP Meeting

Frequency Requirements CC.7.4Each Demand Side Unit shall, as a minimum, have the following capabilities: (a)Able to provide Demand Side Unit MW Response between 0 MW and the Demand Side Unit MW Capacity; (b)Maximum Ramp Up Rate not less than 1.67% per minute of Demand Side Unit MW Response as specified in the Dispatch Instruction; (c)Maximum Ramp Down Rate not less than 1.67% per minute of Demand Side Unit MW Response as specified in the Dispatch Instruction; (d)Minimum Down Time not greater than 30 minutes; (e)Maximum Down Time not less than 2 hours; (f)Minimum off time not greater than 2 hours; and (g)Demand Side Unit MW Response Time of not greater than 1 hour;. (h)maintain Demand Side Unit MW Response at Transmission System Frequencies in the range 49.5Hz to 50.5Hz; (i)maintain Demand Side Unit MW Response at Transmission System Frequencies within the range 47.5Hz to 49.5Hz and 50.5Hz to 52Hz for a duration of 60 minutes; (j)maintain Demand Side Unit MW Response at Transmission System Frequencies within the range 47.0Hz to 47.5Hz for a duration of 20 seconds required each time the Frequency is below 47.5Hz; and (k)maintain Demand Side Unit MW Response for a rate of change of Transmission System Frequency up to and including 0.5 Hz per second as measured over a rolling 500 milliseconds period.

Frequency Requirements On-site Generation operated in Continuous Parallel Mode or Shaving Mode that forms part of a Demand Side Unit, shall, as a minimum, have the following capabilities: (hl)operate continuously at normal rated output at Transmission System Frequencies in the range 49.5Hz to 50.5Hz; (im)remain synchronised to the Transmission System at Transmission System Frequencies within the range 47.5Hz to 52.0Hz for a duration of 60 minutes; (jn)remain synchronised to the Transmission System at Transmission System Frequencies within the range 47.0Hz to 47.5Hz for a duration of 20 seconds required each time the Frequency is below 47.5Hz; and (ko)remain synchronised to the Transmission System during a rate of change of Transmission System Frequency of values up to and including 0.5 Hz per second. On-site Generation operated in Lopping Mode or Automatic Mains Failure Mode that forms part of a Demand Side Unit, shall, as a minimum, have the following capabilities: (p)operate continuously at normal rated output at Transmission System Frequencies in the range 49.5Hz to 50.5Hz;

DSU Concerns Evidence required to prove compliance Interpretation of “capability” of “Generation” to “remain Synchronised” G

Rationale Potential dynamic and transient problems that could lead to material issues for the security of the power system Separate requirements for generation to have the capability is prudent and gives the TSOs the necessary confidence that the system can be operated securely TSO Drivers 1.Timings of protection/control systems 2.Generators that are not designed to handle such frequencies/RoCoF may fail (not due to protection) 3.Individual Demand Sites may change their mode of operation 4.RfG NC requirement for “Power Generating Modules” > 0.8 kW G

12 weeks