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TYPES OF GRIDS GENERATOR

The DC link thus provides the advantages of interconnection of two AC network at different frequencies.

The DC interconnection system is asynchronous thus the system which is to be interconnected is either of the same frequency or at the difference frequency.

The DC interconnection has the certain advantages. The DC tie between two AC systems is non-synchronous (Asynchronous). The DC interconnection or DC tie provides a loose coupling between the two AC system to be interconnected. HVDC (High Voltage Direct Current) Interconnection If the two AC system are connected to the fault line, then the fault level of an each AC system remains unchanged. This is because the additional parallel line reduces the equivalent reactance of the interconnected system.

There is an increase in the fault level if an existing AC system is connected with the other AC system with an AC tie line.

This fault causes complete failure of the whole interconnected system.

Large power swing in one system may result in frequent tripping due to which major fault occurs in the system.

The power swings in one system affect the other system.

The frequency disturbances in one system are transferred to the other system.

The interconnection of the two AC networks is the synchronous tie.

The interconnection of an AC system has suffered from the following problems. But the AC interconnection has certain limitations. The AC link provides a rigid connection between two AC system to be interconnected. Such an interconnection is known as synchronous interconnection or synchronous tie.

For interconnecting the AC system, it is necessary that there should be sufficiently close frequency control on each of the two systems.įor the 50Hz system, the frequency should lie between 48.5 Hz and 51.5 Hz. In HVAC link the two AC systems are interconnected by an AC link.

HVAC (High Voltage Alternating Current) Interconnection The interconnection between network is mainly classified into two types, i.e., the HVAC link and HVDC link.

TYPES OF GRIDS GENERATOR

The spinning reserve consists generator running at normal speed and ready to supply power instantaneously. But for the interconnections of the network certain amount of generating capacity known as the spinning reserve is required. If there is a sudden increase in load or loss of generation in a zone, then it borrows from the adjacent interconnected area. The generating stations are interconnected for reducing the reserve generation capacity in each area. It makes the system economical and reliable. The interconnection of the grid provides the best use of power resource and ensures great security to supply. National Grid – It is formed by interconnecting the different regional grid.Regional Grid – The Regional grid is formed by interconnecting the different transmission system of a particular area through the transmission line.The power which is generated at high voltage is stepped down by the help of step down transformer in the substation and then supply to the consumers.The electrical grid is mainly classified into two types.

But it is located far away from the populated areas. The power station of the grid is located near the fuel source which reduces the transportation cost of the system.