Grid System Advantages
Interconnected Grid system advantages
The function of generating station is to provide power to a large number of consumers. But consumers power requirement will vary as per their activities.
- Due to this variation in demand, the load on a power station is never constant and it varies from time to time.
- We know the fact that electrical power can not be stored.
- The power generating stations must produce power as and when demanded to meet the requirements of the consumers.
- On the other hand, to get maximum efficiency the alternators in the power station have to run at rated capacity.
- In order to meet both varying demands of the consumers and get maximum efficiency from the power station the prime station (steam, thermal, hydralic powre plants) are connected with small power plants ( like biogas, solar, wind etc).
The connection of several generating stations in parallel is known as interconnected grid system.
Even though this arrangements adds extra cost, it gives huge benefits. So it is widely used in now a days. Some of the advantages of interconnected Grid System are given below;
- Exchange of peak loads
- Use of older plants
- Ensures economical operation
- Increases diversity factor
- Reduces plant reserve capacity
- Increases reliability of supply
Let us discuss each of the advantages in detail
(i) Exchange of peak loads
- An important advantage of interconnected system is that the peak load of the power station can be exchanged.
- If the load curve of a power station shows a peak demand that is greater than the rated capacity of the plant, then the excess load can be shared by other stations interconnected with it.
(2) Use of Older Plants:
- The interconnected grid system makes it possible to use the older and less efficient plants to carry peak loads of short durations.
- Even though such plants may be inadequate when used alone, they have sufficient capacity to carry short peaks of loads when interconnected with other modern plants.
(3) Ensures economical operation:
- The interconnected grid system makes the operation of concerned power stations quite economical.
- It is because sharing of load among the stations is arranged in such a way that more efficient stations work continuously throughout the year at a high load factor and the less efficient plants work for peak load hours only.
(4) Increases diversity factor:
- The load curves of different interconnected stations are generally different.
- The result is that the maximum demand on the system is much reduced as compared to the sum of individual maximum demands of different stations.
- In other words, the diversity factor of the system is improved, so increasing the effective capacity of the system.
(5) Reduces plant reserve capacity:
- Every power station is required to have a standby unit for emergencies.
- But when several power stations are connected in parallel, the reserve capacity of the grid system is reduced drastically. This increases the efficiency of the system.
(6) Increases reliability of supply:
- The interconnected system increases the reliability of supply.
- If a major breakdown occurs in one station, continuity of the supply can be maintained by other healthy stations.
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