DSU Modifications Gareth McLoughlin 12 November 2014 SONI Grid - - PowerPoint PPT Presentation

DSU Modifications

Gareth McLoughlin 12 November 2014 SONI Grid Code Review Panel Meeting

5 Modifications

• 1. Background
• 2. Frequency Requirements for Generation
• perated as part of a DSU
• 3. Application Form Data Requirements
• 4. Notice Time
• 5. Signal Requirements
• 6. Performance Monitoring of DSU Dispatch

Instructions

• 7. Next Steps

Background

• 4 week consultation from 10th May to 7th Jun 2013 on
• riginal modifications with respect to DSU requirements.
• Details of the consultation available on SONI website:

– Consultations: http://www.soni.ltd.uk/Operations/GridCodes/documentation/consultations/ – Modifications: http://www.soni.ltd.uk/Operations/GridCodes/documentation/modifications/

• Comments in 2 responses received were addressed and

a Report issued to URegNI on 10th July 2013 seeking approval of changes.

• URegNI have indicated that they will not approve the
• riginal Modification, but will await a Report on the

further changes proposed for DSUs.

Frequency Requirements

• Each Demand Side Unit (or on-site generation operated as a continuous

Synchronous Generating Unit that forms part of a Demand Side Unit) shall, as a minimum, have the following capabilities:

• (h)

maintain Demand Side Unit MW Response at NI System Frequencies in the range 49.5Hz to 52Hz;

• (i)

maintain Demand Side Unit MW Response at NI System Frequencies within the range 48Hz to 49.5Hz for a duration of 1 hour;

• (j)

maintain Demand Side Unit MW Response at NI System Frequencies within the range 47.0Hz to 48Hz for a duration of 5 minutes; and

• (k)

maintain Demand Side Unit MW Response for a rate of change of NI System Frequency up to and including 1.0 Hz per second as measured over a rolling 500 milliseconds period.

• On-site Generation operating in DSU Short-term Synchronous Operating Mode

that forms part of a Demand Side Unit, shall, as a minimum, have the following capabilities:

• (p)
• perate continuously at normal rated output at NI System Frequencies in the

range 49.5Hz to 52Hz;

Frequency Requirements

EirGrid Requirement (Hz) Period Synchronised 49.5 – 50.5 Continuous 47.5 – 52.0 60 Mins 47.0 – 47.5 20 sec Short Term 49.5 – 50.5 Continuous SONI Requirement (Hz) Period Synchronised 49.5 – 52.0 Continuous 48.0 – 49.5 60 Mins 47.0 – 48.0 5 Mins Short Term 49.5 – 52.0 Continuous

Application Form Data Requirements

• Aligning application form data requirements on an

all-island basis, as much as possible.

• EirGrid have included ‘Modes of Operation’ of

Individual Demand Sites at request of ESB. SONI have included a new definition ‘DSU Short-term Synchronous Operating Mode’ in the glossary to provide clarity on the frequency requirements for generators that form part of a DSU.

• TSO-DSO engagement on-going regarding

application process. DSOs have differing views on

• this. TSO relaxed as who provides the information

as long as it is available.

DI Effective Time DI Effective Time

Notice Time

Signal Requirements

• total aggregated Demand Side Unit MW Response from Generation operating

as a continuous Synchronous Generating Unit;

• aggregated Demand Side Unit MW Response from Generation operating as a

continuous Synchronous Generating Unit per Bulk Supply Point;

• total aggregated Demand Side Unit MW Response from avoided Demand

consumption and Generation operating in DSU Short-term Synchronous Operating Mode;

• aggregated Demand Side Unit MW Response from avoided Demand

consumption and Generation operated in DSU Short-term Synchronous Operating Mode per Bulk Supply Point;

• Remaining Demand Side Unit MW Capacity Availability;

Signal Requirements

• Demand Side Unit MW Response from each Individual Demand Site with a

Demand Side Unit MW Capacity of greater than or equal to 5 MW;

• MW Output from Generation Units with a capacity greater than or equal to 5

MW;

• Mvar output from Generation Units with a capacity greater than or equal to 5

MW at Individual Demand Sites with a Maximum Export Capacity specified in the Connection Agreement or DNO Connection Agreement as applicable, as required by the TSO;

• Aggregate MW Output from Generation Units with a combined Capacity of

greater than or equal to 5 MW on an Individual Demand Site, as required by the TSO; and

• Demand Side Unit MW Response from each Individual Demand Site that

comprises the Demand Side Unit, as required by the TSO.

Performance Monitoring of DSU DIs

• Current Method

– DSU predicts D-1 aggregated demand of all Individual Demand Sites that comprise the DSU for each half-hour trading period of the trading day – Must be accurate to within 5% when not dispatched – Used as baseline when dispatched

• New Method

– Baseline calculated based on correlation with historical data – Worked example available on EirGrid Website:

• http://www.eirgrid.com/media/DSU_PM_of_DI_Worked_Example_DRAFT-

Multiple_Sheets_No_Formulas.xlsb

• http://www.eirgrid.com/media/DSU_PM_of_DI_Worked_Example_DRAFT-

Single_Sheet_Formulas.xlsb

Next Steps

• 4 week Consultation on NI Grid Code wording issued on

17th October 2014.

• As previous modifications have not been approved, the

consultation document covered both sets of modifications.

• Any comments that may be received are expected to be
• f a minor nature as working group has addressed most

issues already.

• Report will then be forwarded to URegNI seeking

approval