J A K Douglas UK Session ALPHA2 – Block 4 Barcelona 12-15 May 2003 1 SETTING OF TARGETS FOR...
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Transcript of J A K Douglas UK Session ALPHA2 – Block 4 Barcelona 12-15 May 2003 1 SETTING OF TARGETS FOR...
1J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
SETTING OF TARGETS FOR CONTINUITY OF SUPPLY
THROUGH BENCHMARKING
DOUGLAS J.A.K. and CASTRO SAYAS F.
PB Power Ltd. - United Kingdom
2J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
RELIABILITY INDICES
The principal reliability indices (SAIFI, SAIDI, CAIDI) and treatment thereto differ between countries:
• duration of long interruptions exceeds – 1 minute (Australia, New Zealand) – 3 minutes (Europe – EN50160) – 5 minutes (IEEE P1366–2000)
• selective exclusion of categories of interruptions (severe weather, planned interruptions, transmission interruptions)
3J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
Exclusions (examples)
• Great Britain - Exceptional events (severe weather) may be excluded from penalties under the Information and Incentives Programme (IIP), depending on:
– impact of event and its predictability
– network design and maintenance and
– actions taken by company to deal with the event.
• Victoria, Australia– Excludes transmission failures, widespread rare events
in calculation of incentive/penalty service term (S).
4J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
New South Wales, AustraliaDifferent measures of supply interruption indicesMeasure Description
Overall All interruptions, including transmission interruptions.
Raw All interruptions less transmission interruptions.
Standard Raw, less interruptions due to major natural events and less than 1 minute interruptions.
Modified Standard
Standard, less all planned interruptions
5J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
FREQUENCY OF INTERRUPTIONS versus LOAD DENSITY
y = 105.9x-0.2
0
100
200
300
400
500
0.001 0.010 0.100 1.000 10.000 100.000
GWh/km²
Inte
rru
ptio
ns
per
year
/100
cu
stom
ers
6J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
DURATION OF INTERRUPTIONS versus LOAD DENSITY
y = 102.8x-0.2
0
100
200
300
400
500
0.001 0.010 0.100 1.000 10.000 100.000
GWh/km²
Ave
rage
cus
tom
er m
inut
es lo
st p
er y
ear
7J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
SAIFI versus PROPORTION OF UNDERGROUND CABLES – GREAT BRITAIN
R2 = 0.58
1
10
100
1000
0% 20% 40% 60% 80% 100%
% MV network underground
Cu
sto
mer
inte
rru
pti
on
s (S
AIF
I) p
er
100
cust
om
ers
8J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
SAIDI versus PROPORTION OF UNDERGROUND CABLES – GREAT BRITAIN
R2 = 0.45
1
10
100
1000
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
% MV network underground
Cu
sto
me
r m
inu
tes
lo
st
(SA
IDI)
9J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
CAIDI versus PROPORTION OF UNDERGROUND CABLES – GREAT BRITAIN
0
100
200
300
400
500
0% 20% 40% 60% 80% 100%
% MV network underground
CA
IDI (
SA
IDI /
SA
IFI)
m
inu
tes/
inte
rru
pti
on
10J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
CUSTOMER DENSITY versus UNDERGROUNDING – GREAT BRITAIN
R2 = 0.84
1
10
100
1000
0% 20% 40% 60% 80% 100%
% MV network underground
Cu
sto
mer
s p
er M
V k
m
11J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
STATUS OF COMPARISON OF CONTINUITY
PERFORMANCE IN GREAT BRITAIN IIP and the Distribution Price Control Review• Ofgem, February 2003, " comparisons of Companies’
performance used to set the targets at the last price control (in 1999) were not sufficiently robust "
• Ofgem, April 2003, intends to– review the overall package of output delivery incentives and
– undertake a customer survey to inform a review of performance standards and the IIP
12J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
Ofgem and DNOsComparing Quality of Supply Working Group
SAIDI = customer minutes
customers
= minutes lost x km of network
km of network customers
= minutes lost x km of network x No. of circuits
km of network No. of circuits customers
(length/circuit) (1/"customer sparsity")
13J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
Ofgem and Distribution Network Operators (DNOs)Comparing Quality of Supply Working Group
• Disaggregates MV circuits by grouping similar MV circuits on the basis of three physical parameters– percentage of overhead line,
– circuit length, and
– customers per circuit ("customer sparsity")
• to identify – key drivers in variance in performance between DNOs and
– possible actions for closure of differences in performance between DNOs.
14J A K Douglas UK Session ALPHA2 – Block 4
Barcelona 12-15 May 2003
REFERENCE NETWORK MODEL(UMIST)
• enables the continuity performance of an MV radial network to be modelled using a number of generic reference circuits
• incorporates a process for the disaggregation of a very large number of actual circuits into a limited number of reference circuits, based on key parameters, and
• enables benchmarking and target setting and hence the modelling of strategic programmes of improvements to be undertaken in a comprehensive and systematic manner