Energy Management Systems
Dr. Richard Candy
How Energy Management Systems (in Eskom) improve performance in
delivery of electrical power to customers.
Topics to be covered
• Why we exist – what is our business
• Aspects of Data Acquisition
• Power Application Tools
• Situational Awareness
What is our business?
What is our Business?
2008 South Africa GDP by sector - Total value : R 2 053 488 000.
Agriculture, forestry and fishing
Mining and quarrying
Electricity, gas and water
Wholesale and retail trade; hotels
21% 2% Transport, storage and
3% Finance, real estate and business
8% 13% General government services
Enabling the (South African) economy’s business to happen!
1) What is our product
2) What is the key to enabling businesses to happen?
Our product is electrical energy.
By delivering quality power in a reliable and safe manner.
Why is this so important?
Increased revenue – Why?
Loss of customer load = loss of finance to customer and utility
Improved customer sales
= more electricity demand
= Increased electricity sales
= Increased revenue for customer and utility
List four factors that assist in the delivery of quality power in a safe and
What is our Business?
a) Ensuring grid reliability by managing the = Increased revenue and thus increased business
real-time technical risk confidence.
b) Continuously monitoring the power = Increased customer satisfaction. Equipment risk
quality – voltage and frequency is reduced – (Insurance).
c) If something breaks – fix it fast = Shorter outages reduce losses in revenue to
both utility and customer
d) Situational Awareness = Greater observability and improved situation
awareness results in better maintenance and
thus higher reliability
What do we, as the utility, need to ensure that the above can happen?
SCADA and Metering
Define an Energy Management System or EMS?
EMS = SCADA plus Power Application Software (PAS) tools
Power Application Software
Monitoring power quality
Monitoring Power Quality
Frequency : 49.85 – 50.15
Voltage : Inside contracted customer’s limits
Security : There customer is not at risk due to outages
Reserve : There is sufficient energy to meet the customer demand
B) Monitoring kV Quality
The control staff have a voltage Key Performance Indicator based on a
10 minute sampling period.
The KPI rule is as follows:
(Low Limit > kV > Hi Limit ) > 10 minutes = Alarm
(Low Limit > kV > Hi Limit ) > 19 minutes = Violation
If it breaks – fix it fast
If it breaks – fix it fast
What are the factors that affect real time strategic
• Managing the technical risk from the control rooms.
• Giving regional managers scope to solve problems
• Having the qualified technical staff ready to work 24
x 7 for as long as it takes to repair problems.
• Having permission to make decisions at the coal
• Innovative developments are possible to limit the
spread and impact of major blackouts.
Summary - 1
• A quality SCADA solution is central to effective operation of a utility's assets.
• The challenging issues for SCADA systems and projects today are not the same as they
were a few years ago.
• Today, there is much more importance placed on integration.
• A well planned and implemented SCADA system helps utilities deliver power reliably and
safely to their customers
• Helps to lower the costs and achieve higher customer satisfaction.
• Commitment from the highest level within the organisation is essential as barriers to
success will inevitably be encountered, and senior management support will be essential
in overcoming them.
Summary – 2
So how do Energy Management Systems improve performance in delivery of electrical
power to customers?
Providing data and information on the current power system state in real time.
This then provides the business with the following data and information:
• Validation of key performance indicators
• Validation product quality
• Knowledge of the safety of current network states
• Warning of potential network problems
• Provision of protection operations
• Remote surveillance of substation conditions
• Maintenance indicators
• Customer satisfaction Increased business confidence
Must Have functions
• IEC 61850 (Inter Control Centre Communication Protocol and UCA).
• IEC 60870-5-101
• Full SCADA data accessibility though out the organization .
• Integration of Graphic Information System, Customer information tracking,
Trouble Call systems
• Automation of switching and outage planning
• Integrated Web services.
• Power Application Software.
• Electricity Trading.
• Paperless operating.
1. Smarter Electricity Grids for Competitive Markets “An interview with
John Baker, Annex I Operating Agent, IEA Implementing Agreement on
Electricity Networks Analysis, Research and Development (ENARD)”. An
IEA OPEN Energy Technology Bulletin Interview Issue No. 42, May 2007
2. EU standard for energy management systems The European Union is
developing an energy management blueprint based on an Irish standard.
Elmer Morrissey outlines how it works. November 2008 By Elmer Morrisey
3. Power System Engineering, Inc. (PSE) is a full service consulting firm for