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Transcript of 1 CLASS webinar 27 June 2014. 2 CLASS webinar 27 June 2014 Simon Brooke, Low Carbon Projects Manager...
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CLASS webinar27 June 2014
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CLASS webinar27 June 2014
Simon Brooke, Low Carbon Projects Manager
Electricity North West
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Introduction
Questions & answersBaseline survey report
Voltage regulation technologies
Agenda
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Webinar format
10 minutes questions & answers
30 minutes presentation
Submit written questions on line during the webinar
Press 01 on your telephone key pad to take part in the Q&A at the end of the presentation
or
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Electricity North West’s innovation strategy
Deliveringvalue to
customers
Maximiseuse of existing
assets
Innovativesolutions
to realproblems
Proventechnologydeployable
today
Generatevalue for
customersnow
Offer newservices andchoice for the
future
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Our smart grid development
£30 millionDeliver value from existing
assets
Leading work on developing smart solutions
Three flagship products
Capacity toCustomers
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CLASS
Is seeking to demonstrate thatelectricity demand can be managed
by controlling voltage…
…without any discernible impacts on customers
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Elements of CLASS
Provide a demand reduction capability
to support system balancing
System balancing support
Demand reduction
Voltage control
Reduce demandat time ofsystem peak
Mitigate excessive voltages that occur when generation is high and demand is low
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Key activities to date
CLASS solution
designed; hardware
and software installed
60 primaries selected
which define the CLASS trial area
Real-time data link to
National Grid developed
The methodology and schedule
for the CLASS trials developed
Engaged customer panels to
elicit customer
views
SiteSelection
Design andinstallation of CLASS
technologies
Build datalink withNational
Grid
Design thetrials and
testregime
Engage customers
and develop survey
material
Knowledge sharing and dissemination
Jan 2013 June 2014
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Automation technologies and substation intelligenceDr Vincent Thornley
Siemens Smartgrid Division
Energy Automation
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Presentation Overview
Introduction to CLASS
• CLASS Functions and Techniques
Voltage-Demand Relationship
Tap Stagger Principle
Substation Arrangements
• Numerical AVC Relays
• Retrofit Considerations
ASC Functionality
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Introduction to CLASSCLASS Functions and Techniques
Customer needDetection / activation
Action Effect
Command from SCADA
Reduction of customer
voltage, which reduces load
Adjust AVC target voltage
Balancing and system security
Increase of customer
voltage, which increases load
Reactive powerAbsorption of
VArs from EHV network
Stagger taps
Command from SCADA
Adjust AVC target voltage
Frequency response
Reduction of customer
voltage, which reduces load
Trip parallel transformers
Onsite frequency detection
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Voltage-Demand RelationshipInstantaneous Relationship
0
0.2
0.4
0.6
0.8
1
1.2
Constant-RConstant-P50:50 Mix
PU Voltage
No
rmali
sed
Dem
an
d
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Voltage-Demand RelationshipTime Impact on Demand
0.00
3472
2222
2222
222
0.01
0416
6666
6666
67
0.01
7361
1111
1111
11
0.02
4305
5555
5555
56
0.03
125
0.03
8194
4444
4444
44
0.04
5138
8888
8888
89
0.05
2083
3333
3333
36
0.05
9027
7777
7777
780.8
0.9
1
DemandVoltage
Time (h:m)
PU
Vo
ltag
e /
No
rmal
ised
Dem
and Illustration only
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• Can be used to create additional reactive load presented to transformer primary-side network
• Diagram shows vector currents at different points– Solid arrows represent load– Dashed arrows represent
circulating current
• Mismatch of taps creates ‘spill’ of circulating current on primary side
Tap Stagger Principle
33 kV
20 kV / 11 kV / 6.6 kV
21:1
kn
CL II CL II
CL IIk
n
21 CL II
kn
21
CL IknIn ...2
LI2
n = average tap ratio
k = ratio stagger
2IL = load current
IC = circulating current
Tap up Tap down
circulatingcurrent
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• Measurements from AVC relays:– V, P, Q, f
• Instructions to AVC relays:– Target voltage adjustment– Tap stagger adjustment
• Circuit breaker I/O:– CB status, trip, close
• Interface with Control Desk– via standard substation RTUs– Commands from and status to
CLASS dashboard
Substation ArrangementsNumerical AVC Relays
RTU
ASC
AVC AVC
CLASS-installed
ExistingASC = Autonomous
Substation Controller
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• Target voltage adjustment:– Older relays (particularly
e/m) don’t have ability to adjust targets
– Multi-tapped interposing VT allows adjustment (similar to OC6)
– Tap selection by Argus 8 relay outputs
• Measurements:– Not available from AVC relay– Additional relay (Argus 8)
measures V and f
Substation ArrangementsRetrofit Considerations
RTU
ASC
AVC
CLASS-installed
ExistingASC = Autonomous
Substation Controller
Argus 8 Argus 8
AVC
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Substation ArrangementsInstalled Equipment
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• Two Responses, termed primary and secondary
• Secondary Response – slow– ‘Higher’ setpoint (e.g. 49.8Hz)– Adjustment of AVC setpoint only
• Primary Response – fast– ‘Lower’ setpoint (e.g. 49.7Hz)– Trip parallel transformer and
adjustment of setpoint– Includes checks for bus coupler,
transformer on load and firm capacity
ASC FunctionalityFrequency Response
f
Vs
49.849.7
Trip CB
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• Makes use of functionality inherent in AVC Relay
• Combined requirements– Maintain regulation of voltage– Introduce circulating current– Prevent tap changers from
running away
• Achieved by setting different reactive power targets for each AVC relay
• Three stages of operation
ASC Functionality Reactive Power Management
VIT1
IT2Itotal
33 kV
20 kV / 11 kV / 6.6 kV
21:1
kn
CL II CL II
LI2
n = average tap ratio
k = ratio stagger
2IL = load current
IC = circulating current
Tap up Tap down
Vector diagram of loads
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• Manual services– Demand reduction
(full and half)– Demand boost
(full and half)
• Automatic demand reduction– Single stage
ASC Functionality Load Management
Load (MVA)
Time (Sec)
Voltage setpoint
Upper limit (98%)
Lower limit (85%)
CB 1 (S/S 1)
Voltage (V1)
Time (Sec)
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ASC FunctionalityOverview
Autonomous Substation ControllerSICAM ACP
Battery capacity management
Local thermal management
Local voltage management
Frequency management
Capacitor control
OLTC AVC management
Reactive power management
AVC relay
Capacitor bank
Battery bank / inverter
Switch management
CBs / Feeder panels
Data concentrator
Premises – LV Conn Mgr Demand management
Thermal modelling
RTU
Loca
l coo
rdin
atio
n an
d pr
iorit
isat
ion
Feeder Line modelling
Network functionCoordinationDevice managementComponent layer Abstraction
CLASS functionalities Outside CLASS functionalities
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CLASS Customer EngagementBaseline Survey Report, June 2014
Dr David Pearmain
Director of Advanced Methods
Impact Research
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Customer research methodology
Qualitative
Formulate communications
and materials
Quantitative
Compare feedback
trial vs control
Customerresearch
“CLASS will be indiscernible to customers”Customers will not see / observe / notice an impact on the supply
quality when these innovative techniques are applied
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Additional face to face
recruitment as appropriate
Agree process for dealing
with customer enquiries
Brief customer facing
employees
WE ARE HERE: Baseline survey
completed
Findings published
First seasonal survey
(summer)
Where are we now in the customer engagement plan?
April2014
May2014
August2014
September2014
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200 industrial and commercial
customers
496 domestic customers
A statistically robust and representative sample
All 696 CLASS participants live or work at properties on selected CLASS circuits.
This presentation contains feedback from our panel of 696 CLASS participants prior to any CLASS tests
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Objectives of the baseline survey
Recruitment of customers into the CLASS project
Data privacy consent
Obtain demographic data for subsequent analysis
Obtain behavioural data for subsequent analysis
Obtain perception data to benchmark current satisfaction
Establish preferred (future) contact method
Communication of next steps and incentive payment
Objective
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92% of households are ‘often’ or ‘always’ in during peak demand hours of 4-7pm - hence they at least have the opportunity to observe CLASS
am pm
pm
pm am
3
2
3
3
0.60483870967742
0.403225806451613
7.05645161290323
7
2
4
14
26
19
23
25
64
77
69
47
0
1
4
Don't know / Varies too much Never Not very often Occasionally Often Always
Day time Monday to
Friday (9am-5pm)
Tea time Monday to
Friday (5pm-7pm)
Evening Monday to
Friday (After 7pm)
Weekends
Domestic N = 496 Ask All C3 On average, when are you or other members of your household, at home during the week and weekend for extended periods of time?
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A significant proportion of I&C participants and their colleagues are on-site during conventional working hours. Almost half are on-site after 5pm.
am pm
pm
pm am
14
45
20
11
6
6
1
11
7
17
2
13
6
10
11
51
36
46
85
Don't know / Varies too much Never Not very often Occasionally Often Always
Day time Monday to
Friday (9am-5pm)
Tea time Monday to
Friday (5pm-7pm)
Evening Monday to
Friday (After 7pm)
Weekends
I&C N = 200 Ask All On average, when are you and/or colleagues, on site during the week and weekend for extended period of times? We understand that in some cases your site may not follow a set routine or that the times may vary from time to time. Please try and answer this based on the times the site is most likely to be occupied by staff.
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Overall SatisfactionDomestic N =496, I&C N=200 Ask All E1 On a scale of 1-10 where 1 is completely dissatisfied and 10 is equal to completely satisfied,
how satisfied are you with the service provided by Electricity North West?
Satisfied Top 3 Box
88% 94%
Overall satisfaction with the service provided by Electricity North West is currently at a high level
This is a key measure that will be benchmarked in subsequent Trial surveys. Any significant decrease will be investigated for underlying causes – such as CLASS.
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Overall Satisfaction
However, satisfaction is significantly lower amongst domestic participants who have had reason to contact Electricity North West about an interruption
Domestic cus-tomers (496)
I&C customers (200)
Vulnerable (202) Domestic ever had reason to con-
tact (48)
Ever had reason to contact (I&C,
57)
1% 1%6%0.03 0.03
0.088%
4% 3%
13%
11%
12%15% 9%
6%29%
12% 18%
12%
10%
27%
64% 61%73%
54%
33%Satisfied - 10 9 8
7 6 5
4 3 2
Dissatisfied - 1
Domestic N = 496 Ask All E1 On a scale of 1-10 where 1 is completely dissatisfied and 10 is equal to completely satisfied, how satisfied are you with the service provided by Electricity North West?
% Satisfied Top 3 Box 88% 94% 95% 71% 89%
Overall satisfaction with call handling and fault management is out of the scope of this study, however, if it is influencing perception of power quality, this will be observed and differentiated from any potential CLASS effect
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41,794There are…
…appliances amongst the total sample
Domestic N = 496, I&C N=200 Ask All D2 Which of the following appliances do you have in your home/site?
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7.8%
The proportion of customers noticing a difference in any of their appliances in the last 7 days is a key measure and will be monitored in subsequent surveys
Domestic N = 496, I&C N=200 Ask All E3 Thinking about the last 7 days have you observed any of your appliances/electrical items working slower or less effectively than usual at certain times of the day?
of customers said 1 or more of their appliances were working slower / less effectively in the last 7 days.
Power quality experience
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of customers said 1 or more of their appliances were working quicker/more effectively than usual over the last 7 days.
Domestic N = 496 Ask All E5 Did you observe any of your appliances/electrical items working quicker or more effectively than usual at certain times of the day over the last 7 days?
2.2%
Power quality experience
The proportion of customers noticing a difference in any of their appliances in the last 7 days is a key measure and will be monitored in subsequent surveys
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Households are significantly more likely to have observed a change in their lighting over the course of the last 7 days - particularly flickering
Domestic N = 496 I&C N=200 Ask All E7 Thinking specifically about the lighting in your home/on your site have you observed any of the following over the last 7 days?
7% 16% 2%
80%Dimming of lights Flickering of
lightsBrightening of
lightsNone of these
Power quality experience
1% 3% 0%
95%
Dimming of lights Flickering of lights Brightening of lights
None of these
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Executive summary 1
Do CLASS participants have the opportunity to observe CLASS tests?
of households are often in at times of peak demand 4-7pm
of I&C organisations are on-site after 5pm.
92%1/2
Are specific groups of customers more sensitive to CLASS?
1/5 of households have a medical related dependency on electricity and 2/5 are eligible for the PSR register, which may heighten their sensitivity.
The type of electrical appliances customers own/use may also mean they are more susceptible to noticing CLASS.
?
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Executive summary 2
What are customers currently observing?
1/5 households notice dimming or flickering or brightening of their lights, mostly between 4pm-7pm, for a few seconds.
Only 5% of I&C customers observed these effects.
7.8% observed one of their appliances working slower/less effectively:
• Electric showers between 7am-9am (household)• Lighting between 4pm-7pm (household) and between 11am-1pm and 4pm-
7pm (I&C)• CRT televisions between 4pm-7pm (household)
2.2% observed any one of their appliances working faster/more effectively:
• Tungsten light bulbs after 7pm (household)
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Executive summary 3
Can we measure impact on customer satisfaction?
How will we differentiate between the two?
We will compare 'control’ and ‘test’ groups of customers, both of whom will have similar exposure to interruptions, but only one of which will be affected by CLASS.
Yes – but significant difference between satisfaction levels of households who have experienced an interruption to their supply and those who have not.
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&QUESTIONS
ANSWERS
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CLASS webinar27 June 2014