dsu modifications séamus power 12 november 2014 – eirgrid gcrp meeting

DSU Modifications

Séamus Power12 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


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 2013Issues with

current method

highlighted at DSU

workshop

Nov 2013Method

proposed and feedback

received

Jan 2014Updated method

proposed and feedback

received

Mar 2014Analysis

presented

Apr 2014Method refined

based on vote

June 2014Brought to GCRP. Sent back to WG

Jun 2014Alternatives

proposed

Jul – Sep 20142 meetings analysing

3 methods. DSUs unable to reach

agreement

Nov 2014Original

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 3.8 3.0 1.3Unbiased 3.5 3.5 3.5

Not Open to Manipulation 2.5 2.8 3.3

Clear, Transparent, Understandable and

Easily Calculated2.3 2.5 4.0

Known in Advance 1.8 2.3 3.8

Suitable for System with High Number of

Dispatches3.5 2.8 1.0

Suitable for Sites with High Variance 2.8 2.3 1.0

2.9 2.7 2.5

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 Exchange Electric Ireland Activation Energy

iPower Dalkia

Activation Energy

DSU Frequency Requirements


Frequency Requirements

CC.7.4 Each 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 Drivers1. 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

0

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25

04:00 06:00 08:00 10:00 12:00 14:00 16:00 18:00 20:00

MW

h

TimeAggregate QH Meter Readings (MWh)

SCADA equivalent in MWh (MWh)

Aggregate QH Meter Readings + SCADA equivalent in MWh (MWh)

0

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25M

Wh

Time

Aggregate QH Meter Readings (MWh)


12 weeks

0

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Time



10

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Offset Aggregate QH Meter Readings (MWh)

dsu modifications séamus power 12 november 2014 – eirgrid gcrp meeting

Documents

meeting eirgrid

gcrp instruction

eirgrid gcrp meetingactions

dispatch instruction

dsu workshopnov

dsu wg

current method

updated method