VISION offers unique and complete solutions for protection and control of large power systems effectively in order to ensure the stability of regional and / or national electrical system in order to avoid large areas of black-out in case of accidents or failures in the power grid.
The system consists of several control devices in various substations. All control devices are connected to each other through communication channels.
The VISION established a Three-defense online exclusive system to protect the electrical system from the black-out. This system significantly improves grid stability.
The first line of defense consists of fast and accurate protection relays to ensure that the fault is quickly eliminated to maintain system stability.
The second line of defense is the emergency control to serious flaws. If the imbalance between generation and load arises, the protection will take some action, such as turning off the generator or disposal charges, to ensure system stability.
While the stability of the power system is affected after the failure, the stability control system (SPCS) VISION will calculate the energy flow and generate corresponding control strategies. Then control commands are sent to the execution device to generate actions to maintain system stability.
The third line of defense is the local corrective control, such as out-of-step and disposal charges for extremely serious contingencies. If the second line of defense not redeem the stability, the third line will operate to prevent collapse and minimize pressure drop.