A system and method for synchronous fixed value adjustment based on transformer transformation ratio

Abstract

The invention discloses a system and method for synchronous fixed value adjustment based on transformer transformation ratio. The high voltage side of the main transformer is connected to the high voltage busbar through the high voltage side circuit breaker of the main transformer, and the low voltage side of the main transformer is closed to the busbar and the power generator through the outlet of the generator. The machine phase connection, the voltage transformer at the generator terminal is matched with the closed bus bar at the generator outlet, the output terminal of the voltage transformer at the generator terminal is connected with the synchronous device through the secondary line of the machine terminal voltage, the voltage transformer at the high voltage bus is connected with the high voltage The busbar is coordinated, and the output terminal of the high-voltage busbar voltage transformer is connected to the synchronous device through the busbar voltage secondary line. The system and method can eliminate the influence of the main transformer transformation ratio on the synchronous voltage by adjusting the voltage rating of the side to be paralleled. Simple, efficient and fuel efficient.

Description

technical field [0001] The invention belongs to the technical field of electric power test and electric power debugging, and relates to a system and method for adjusting a fixed value in the same period based on a transformation ratio of a transformer. Background technique [0002] The grid-connected operation of generators is one of the most important operations in power plants. The quality of the grid-connected effect is related to the safety of the main equipment and the stable operation of the power grid. The grid-connected operation of generators is realized through synchronous devices. When the synchronizing device judges that the voltage difference, frequency difference and phase angle difference on both sides of the grid-connected circuit breaker are within the synchronous setting value, it sends the closing command of the grid-connected circuit breaker, and the generator is connected to the grid. Usually, the fixed value of the synchronization device includes: frequ...

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Problems solved by technology

Then, the transformation ratio of the main transformer will be adjusted according to the dispatching requirements. The change of the transformation ratio will affect the synchronous voltage of the grid-connected circuit breaker, which will cause no connection to the grid or a large voltage difference to the grid, which will affect the production and equipment. Safety

Carrying out the homologous nuclear phase test again can solve the problem, but to conduct the homologous nuclear phase test again, on the one hand, it is necessary to apply to the power grid to vacate the high-voltage bus, which is cumbersome and complicated to operate; on the other hand, the test takes about 6 hours. At this time, the generator Maintaining 3000 rpm consumes a lot of fuel

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