Transcription of Chapter4-Parallel Operation of Generators
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Chapter4-Parallel Operation of Generators
parallel Operation of Generators 1 Chapter 4: parallel Operation of Generators In modern power systems isolated Generators are very rare. Power systems are highly interconnected and many Generators share the load. The first problem of an engineer is connecting a synchronous generator on an existing bus. Generator 1 Generator 2 SystemLoad3 phaseswitchSynchronizing lamps Figure 4-1 CONNECTING a GENERATOR to a BUS The above figure 4-1 illustrates a generator G1 which is already connected to a power grid under load. Generator 2 has to be connected or brought on line 1. The prime mover of the generator has to bring the speed of the shaft close to the rated speed of the generator. 2. The excitation of the generator has to be increased to give a no-load output voltage as close as possible to the existing bus voltage We want to create a phasor rotation for generator 2 output similar to the bus voltage phasor.
Parallel Operation of Generators 2 Recap: • Phase sequence must be the same • Voltages must have same magnitude • Frequency must be the same
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