decreasing the technical losses 6, 7. The power generated

from these DGs is not connected to the national grids as they

range from few kilowatts (KW) to several megawatts (MW)

8, 9. Radial distribution systems are much modest but are

more exposed to outages instead of interconnected system.

During normal operating conditions the loads accomplish its

required power demand, but if any fault occurs, the circuit

trips causing failure to power flow. Despite the fact that

distribution systems have localized effects, statistics shows that

distribution system failure affects the system as much as 85

to 90 percent towards the unavailability of supply to load as

compared with failure of other parts of electric power system

10. Amalgamation of DG in the distribution system will

provide an extra power for operation of loads even under faulty

conditions. The placement of DG and protection devices will

affect the reliability of system with respect to DG penetration


Researchers are eager to develop such systems which are

feasible, economical and time saving to cope with the increasing

power demand and improve power system reliability. In

this regard, distributed generation is considered to be the power

paradigm for the new millennium. Distributed generation has

a vital impact on power system, for this purpose, distributed

generation source is connected to distribution system causing

variation in power flow and reliability factors. This depends

on the optimal location, size and number of distributed generation.

Power generation and utility companies are looking

for techniques to reduce costs and still provide the acceptable

level of reliability necessary for the customers satisfaction. One

solution is to add distributed generation with right configurations

into distribution system. In this research the impact of

distributed generation on the reliability of distribution system

will be analyzed.

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