Power System Analysis II IOE Notes and Question Bank solutions

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1.a. What do you mean by interconnected power system? Describe merits and demerits of the interconnected system.

Ans: The power system in which a number of generators of different area operated in parallel to meet the total load of these areas is called interconnected power system. In other language A power  system in which two or more generating station transmission station and distribution system are interconnected together to supply a common load is called interconnected power system.

Merits of interconnected power system

• Availability increases:

When there is a fault in a system the power can be taken from another system. Hence continuity of supply can be maintained.

• Reliability:

Power quality can be maintained in an interconnected system, Distribution in a system can be insulated while giving continuity to rest of the system.

• Minimization of cost/Investment:

In term of back up plant interconnected system conserve the need of energy without installing a new generator.

• Overall efficiency is increased as power generated is not wasted as in case of independent system.

Demerits of interconnected power system

1. Interconnection process is complex even a small variation in voltage frequency is not allowed.
2. chance of faults spreading is more in interconnected system.
3. maintenance cost is increased due to safety facility.
4. communication is tedious and required in making every discussion.
5. continuous monitoring is required.