What parameters must be within range to successfully synchronize to the power system?

To successfully synchronize a generator to the power system, it is crucial for three parameters to be matched: frequency, voltage, and phase angle.

Frequency must be identical because if it differs, the generator will attempt to inject or absorb power in a way that can lead to system instability or damage. Voltage must also be identical, as a mismatch could cause large currents to flow, potentially damaging equipment and leading to unsatisfactory operation.

The phase angle is equally important because it determines the relationship between the voltage waveforms of the generator and the grid. When these parameters are in alignment, the generator can connect to the grid smoothly and safely, minimizing stress on electrical components and maintaining system stability.

Other choices, while they might touch upon important aspects of power system operation, alone do not encapsulate the complete requirement needed for synchronization. For example, generator speed and voltage, while relevant, do not address the necessity of phase angle alignment, nor do voltage and power angle provide a full picture in terms of frequency matching, which is essential for synchronization.