1. Demand Control Field Trials
Overview of proposed field trials
16th March 2016

2. Contents Meeting aims and objectives Trials aims and objectives
Trial design structure
Trial design considerations

3. Meeting aims and objectives
To provide an overview of the proposed trial
Allow the opportunity for questions and discussion
Objectives
Secure agreement from DNOs to participate in the trials
Agree timescales for implementation

4. Trial aims and objectives
To comprehensively understand the effectiveness of Voltage Reduction in distribution networks for the purposes of reducing load on the network
Effectiveness metrics: (i) How much demand reduction can be achieved? and (ii) How long does it take to be delivered?
Objectives:
Evaluate the effectiveness of Voltage Reduction in Demand Control
Focussing on the magnitude and duration of benefits
Quantify and assess the relationship between distributed generation and Voltage Reduction through local real-world field trials
Evaluate the effectiveness of procedures for the implementation of Voltage Reduction
Develop best practice guidelines and training procedures to streamline NGET and DNO practical processes for the implementation and management of Demand Control events
Investigate the potential impacts Demand Control events may have on electricity customers

5. Trials Design Structure

6. Regional trials Objectives Approach
Evaluate magnitude and timescale of achievable demand reduction
Determine variability of response due to time-of-year, time-of-week and time-of-day
Approach
Identify suitable trial networks with primary substations dominated by:
Domestic load
Industrial & commercial load
Industrial, commercial and domestic load
High proportion of generation
Deploy high resolution monitoring equipment at substations
Initiate ‘Voltage Reduction Stage 1’
Monitor demand response for comparison against models

7. Regional trials

8. Local trials Objectives Approach
Confirm response of electricity demand and distributed generation to variations in the distribution system voltage
Support validation and enhancement of the composite demand model
Approach
Identify potential trial networks with a mixture of load and generation types where the mixture is known or can be confidently estimated
Initiate voltage reduction
Monitor demand response for comparison against models

9. Local trials

10. Trial considerations

11. Site selection summary
Trial
Description
Site
Regional
Voltage–Demand
Model Verification
Primary Substations with common Bulk Supply Point with following load types in various geographies (DNO license areas):
Predominantly domestic/residential;
Predominantly commercial/retail; and
Predominantly industrial.
Voltage–Generation
Primary Substations or Feeders with the following generation types in various geographies:
Predominantly renewable generation (with known load mix) – e.g. Rural wind/solar;
Predominantly generation (with known load profile) – e.g. Urban CHP and Waste to Energy; and
High Proportion of generation in Voltage control mode (PV).
Local
Demand Response Delivery Timescales
Several DNOs enacting Voltage reduction in several GSP groups upon notification by NGET:
Common monitoring between GSP, BSP and Primary sites for comparative analysis.
National Demand Response from Voltage Reduction verification

12. Proposed test schedule – regional trials
Time-of-year
Time-of-week
Time-of-day
Number of tests
Spring
(27th March – 6th May)
Tuesday and Sunday
03:00 – 05:00 1
06:00 – 10:00
13:00 – 15:00
16:00 – 20:00
Summer
(7th May – 4th September)
Autumn
(4th September – 29th October)
Winter
(30th October – 26th March)

13. Proposed test schedule – local trials
Trial type
Time-of-year
Time-of-week
Time-of-day
Network type
Number of tests
Load
Spring
(27th March – 6th May)
Tuesday and Sunday
03:00 – 05:00
1 – 4 2
06:00 – 10:00 3
13:00 – 15:00
16:00 – 20:00
Summer
(7th May – 4th September)
Autumn
(4th September – 29th October)
Winter
(30th October – 26th March)
Distributed generation
N/A
Generating periods 5 6
Non generating periods 7 8 9

14. Requested DNO involvement

15. Sought after DNO involvement
Provide comments on the proposed methodology
Recommend areas for trial focus
Known areas for potential benefits or issues from previous trials
Subscribe to overall plan and broad timescales
Agree to installation of temporary monitoring equipment in identified substations
Commit to short-term trial targets and deadlines
If not already covered by this point in the discussion, cover the benefits identified by the CASS project and the desire to run a sub-set of trials to determine the benefits and impacts this could have on implementation of voltage reduction and maintaining safety limits.

16. Tim Butler