The presentation discusses key concepts in power system engineering: reliability, uncertainty, flexibility, and security. It highlights the challenges of ensuring continuous electricity supply due to random failures and emphasizes the importance of planning for flexibility and security in response to evolving societal expectations. The document underscores the need for investments in infrastructure to enhance reliability and address uncertainties in the power system.

1. A PRESENTATION ON
THE TERMS : POWER SYSTEM RELIABILITY,
UNCERTAINTY, FLEXIBILITY AND SECURITY
PRESENTED BY:- Karansinh Parmar

2. CONTENT
 SYSTEM RELIABILITY
 UNCERTAINITY
 FLEXIBILITY
 SECURITY
Karansinh Parmar M.Tech. in Electrical
PowerSystem Engineering
2

3. SYSTEM RELIABILITY
 Modern society expects that the supply of electricity
should be continuously available on demand.
 This exactly may not be possible due to random system
failures which are generally beyond the control of power
system engineers.
 The probability of consumers being disconnected,
however, can be reduced by increased investment on
systems by providing high quality equipment or
redundancy and better maintenance.
Karansinh Parmar M.Tech. in Electrical
PowerSystem Engineering
3

4. RELIABILITY
 The economic and reliability constraints are conflicting in
nature and make the planning decisions and difficult.
 The reliability of supply to consumers is judged from the
frequency interruptions, the duration of each interruption
and the value a consumer places on the supply of
electricity at the time that service is not provided.
 The value to consumers is determined by the benefits
which they can derive from using it, e.g. the production of
goods, lighting, TV viewing, air-conditioning and heating
at home and in shops and offices, improvement in their
standard of living and for entertainment purposes in
theatres, cinemas, etc.
Karansinh Parmar M.Tech. in Electrical
PowerSystem Engineering
4

5. UNCERTAINTY
 System planners advise the decision makers
by evaluating the major alternatives for
facing the future. The economic crisis
experienced during recent years, the
technological developments and the change
in the sociological environment reinforced the
importance of the factors which poorly taken
into account in the past-the uncertainty of the
future and the call for security from the
system.
Karansinh Parmar M.Tech. in Electrical
PowerSystem Engineering
5

6. FLEXIBILITY
 Flexibility appears with the improvement in the
ability of the power system to adapt itself quickly
to new circumstances, in order to be permanently
used in the best way.
 The power system of the future will be
characterized by a greater requirement for
flexibility. Therefore, flexibility will have to be
considered at the planning stage as well as at the
operation stage.
Karansinh Parmar M.Tech. in Electrical
PowerSystem Engineering
6

7. SECURITY
 Security affects the operation and the structure of
the system.
 The system security is defined here as its ability
to avoid or limit-major outages which entails the
collapse of entire parts of the system.
 This matter which up to now has not been
investigated deeply will become of major
importance because in the future consumers will
accept major tripping less and less.
Karansinh Parmar M.Tech. in Electrical
PowerSystem Engineering
7

8. THANK YOU
Karansinh Parmar M.Tech. in Electrical
PowerSystem Engineering
8