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In an alternating current (AC) electric power system, synchronization is the process of matching the frequency, phase and voltage of a generator or other source to an electrical grid in order to transfer power. If two unconnected segments of a grid are to be connected to each other, they cannot safely exchange AC power until they are synchronized.
If the generator is turning at a lower frequency than the grid, the synchroscope pointer rotates continually in the direction (usually counterclockwise) marked "slow" or "lag" on the dial to indicate that the generator is running slower than, or lagging behind, the grid. If the generator is running faster than the grid, the pointer rotates ...
[citation needed] In a traditional grid dominated by synchronous generators, a strong grid with SCR greater than 3.0 will have the desired voltage stability and active power reserves. [4] A weak grid (with SCR values between 2.0 and 3.0 [6]) can exhibit voltage instability and control problems. [5] A grid with SCR below 2.0 is very weak. [6]
With the SSS clutch retrofit, the existing turbine setup is largely reused. Here, the turbine uses its existing fuel source to start and sync to the grid, which is when the SSS clutch disconnects the turbine and generator. The generator thus uses grid energy to keep spinning, to provide leading or lagging reactive power as needed.
Droop speed control is a control mode used for AC electrical power generators, whereby the power output of a generator reduces as the line frequency increases. It is commonly used as the speed control mode of the governor of a prime mover driving a synchronous generator connected to an electrical grid.
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high-SCR generator has more synchronizing power, making it easier to operate generators in parallel. Therefore, in practice the design of a generator is seeking an SCR that balances benefits and drawbacks for a particular application. [7] SCR is a measure of the electrical stiffness (also known as a synchronizing coefficient [8]) of the machine.
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