1、 Delayed operation
Usually, when the generator excitation system is in an overexcited state, it transmits both active and reactive power to the system, with a positive power factor. This operating state is called delayed phase operation, also known as delayed phase operation.
2、 Leading phase operation
Reduce the excitation current of the generator, reduce the generator potential, and the power factor angle becomes advanced. The load current of the generator generates a magnetic and electric response, and the generator delivers active power to the system but absorbs reactive power. This operating state is called leading phase operation,
3、 Phase modulation operation
Phase modulation operation refers to the operating state of a generator that does not emit active power but only transmits inductive reactive power to the power grid, thereby regulating system reactive power and maintaining system voltage level. Differences and connections between delayed phase, leading phase, and phase modulation of generators
Several grid connected operation states of synchronous generators
1. Delayed phase operation (normal operation) - The generator simultaneously sends active and reactive power to the power grid (capacitive)
2. Leading phase operation (leading operation) - The generator sends active power to the grid and absorbs reactive power from the grid.
3. Phase modulation operation - the generator absorbs active power from the power grid to maintain synchronous operation and sends reactive power to the grid
4. Motor operation (abnormal operation) - The generator absorbs both active and reactive power from the power grid to maintain synchronous operation. The first three operating states are the normal operating states of the synchronous generator, and the second and fourth operating states should be avoided,
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