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System Configuration
FSC mainly consists of the following components:
Capacitor Bank
Capacitor banks are used to achieve the compensation for transmission line inductance so as to reduce the electrical distance between two substations and improve the system transient stability.
MOV
MOV has good non-linear characteristic. It provides overvoltage protection for capacitor banks to limit the overvoltage cross capacitor bank at the protection level 2.0pu ~ 2.5pu (typically) or less, to ensure the safe operation of capacitor bank.
Spark Gap
The duration from turn-on command issuing to completely spark gap conduction is less than 1ms. It prevents the MOV against damage due to the excessive absorption of energy.
Damping Circuit
The damping device comprises damping reactors and linear resistor string gap (or non-linear resistance). When the series compensation device is in bypass state, the damping circuit can facilitate and speed up the energy storage in capacitor.
Bypass Switch
The closing time of bypass switch is longer than the conduction time of spark gap, but it can cause the spark gap interrupted. In addition, it provides normal operation and maintenance functions for series compensation devices.
FSC Control and Protection System
The typical configuration of series compensation is shown as below. Protection devices and trigger gap control are in redundant design. The switching control device integrates conventional circuit breaker monitoring and control functions in one rack. The protocol converter and the remote device can be configured according to the actual situation. The remote control unit provides distant sequence control of series compensation to realize free-maintenance station.
