Transcript Slide 1

MPID 223
(Failure to Follow Synchronising Instruction)
JGCRP 12th November 2014
(Anne Trotter)
Background
• Grid Code Modification Proposal MPID 223 was presented by
EirGrid and SONI at the Joint Grid Code Review Panel on
23rd February 2012 in Belfast, relating to changes to the
Scheduling and Dispatch Code (SDC) that arose as a result of
clarifications needed to the “Failure to Follow Notice to
Synchronise”.
• Proposals for amendments to the Grid Codes needed as a
result of the above were discussed at Joint Grid Code Review
Panel Meetings on 23rd February and 24th May 2012 and
were consulted upon from 23rd May 2012 until 28th June
2012.
Background cont.
•
On 28th September 2012 EirGrid and SONI (the TSOs) issued a joint response to the
consultation, which was published on the EirGrid and SONI websites
http://www.eirgrid.com/operations/gridcode/consultations/
•
In this response the TSOs addressed the points raised by the respondents to the consultation
•
On 28th September 2012, the TSOs sought the approval of:
•
–
The Commission for Energy Regulation for the specified changes to the EirGrid Grid Code
–
The Northern Ireland Authority for Utility Regulation for the specified changes to the SONI
Grid Code
In May 2013 CER and UREGNI wrote to EirGrid and SONI and UREGNI requesting the TSOs
consider a number of specific points for discussion with the Grid Code Review Panels prior to
resubmitting the modification proposals
Background cont.(1)
• On 10th June 2014, EirGrid and SONI responded to CER and
UREGNI with a report:
http://www.eirgrid.com/media/MPID_223_Failure_to_Follow_Notice
_to_Synchronise.pdf showing that there is no evidence to suggest a
negative or positive impact on the cost of consumption, as a result
of implementation of MPID 223.
• At the JGCRP meeting on 11th June 2014, it was noted that the
TSOs had issued this report, on Failure to Follow Synchronising
Instruction, to the Regulators.
• The CER requested that this item (MPID 223) be brought forward to
the November 2014 JGCRP/GCRP for final discussion.
Change Being Proposed
• OC10.7.1.2 (EirGrid Grid Code) allows the generator 10 minutes to
rectify a non-compliance.
–
If a strict monitoring process was to be applied the Generator would be deemed to have
failed to comply with an instruction if it had not synchronised the unit within 5 minutes of the
original instructed time. The generator would then have another 10 minutes to rectify the
situation (i.e synchronise) or else they have failed to comply with the instruction and must
declare the unit unavailable.
• A 15 minute window is consistent with SDC2.4.2.11 and it is the
TSOs view that this built in the above timings but removed the need
for formal Testing/Monitoring to trigger a re-declaration
• Considering the above, the TSOs consider it pragmatic to allow 15
minutes before issuing a Failure to Follow Synchronising Instruction
and when issued the unit must be declared to 0 MW.
Other changes
• It has also been agreed with Generators as part
of the business process development that the
TSO can request a unit to synchronise earlier
than its Notice to Synchronise time but that the
instruction to the generator would reflect the
Notice to Synchronise time and only be
amended if the unit synchronised earlier.
• In the interest of completeness the TSOs believe
this should be included in the Grid Code
MO and TSO Initial Analysis of the
Impact of Modification Proposal MPID
223 – June 2014
• A total of 7 cases of potential fail to sync events in 2013 were
analysed. While maintaining the original and actual Market
conditions on the trading day in question (i.e. no change to wind or
system load) the availabilities of the units were changed in the
Unconstrained Unit Commitment (UUC) market engine and
compared to a Basecase, run for the day in question to give an
indication of the change in Production Cost for the trading day and
any change in average System Marginal Price (SMP).
• The same process was carried out in the Reserve Constrained Unit
Commitment (RCUC) engine.
• The results indicated no real change in SMP and show both
increases and decreases in production costs in both the UUC and in
the RCUC.
MO and TSO Initial Analysis of the
Impact of Modification Proposal
MPID 223 – June 2014
• The market engine is designed to optimise the most
economic dispatch to meet the schedule demand.
• In real time the TSOs need to schedule reserve and
invariably there are differences in the forecast demand
and the actual demand and in the forecasted generation
from wind and actual generation from wind.
• Units which are synchronising (and therefore potentially
failing to synchronise) can be more expensive units and
therefore there is a higher probability that such unit(s)
will not have been scheduled in the economic dispatch in
the UUC market engine.
MO and TSO Initial Analysis of the
Impact of Modification Proposal
MPID 223 – June 2014
• In the case where a unit fails to synchronise, the
TSOs review the demand, wind forecast,
interconnector flows, and performance of other
units and make a decision to:
1. Operate the system with the increased cost of holding the
required amount of reserve. (If there is a greater
unreliability of units synchronising, long term this could
increase the amount of reserve TSOs need to hold which
increases reserve costs directly impacting the consumer).
or
2. Start another more expensive unit (or perhaps a cheaper
unit, as the unit failing to synchronise may be part of a
Transmission Constraint Group)
MO and TSO Initial Analysis of the
Impact of Modification Proposal
MPID 223 – June 2014
• Transmission Constraints exist in both Transmission System
Operators (TSOs) in Ireland and Northern Ireland.
• This means Generation Units, which are not run in the market,
need to be constrained on for system security reasons.
• If any of these “constrained on” units subsequently fail to
synchronise, the production cost is reduced as cheaper units
are run.
• However there may be an increased risk due to system
security being reduced. It must be noted the TSOs continue to
operate the power system prudently within an acceptable
level of technical operating parameters.
Implication of not
Implementing MPID 223
• Potential ongoing confusion in the interpretation
of the obligations of Generators with regard to
‘Failure to Follow Notice to Synchronise’
• Potential for different implementation of Failure
to Follow Notice to Synchronise in Ireland and
Northern Ireland.