Synchronous constant value adjustment system and method based on transformer transformation ratio

Abstract

The invention discloses a synchronous constant value adjustment system and method based on a transformer transformation ratio. The high-voltage side of the main transformer is connected with a high-voltage bus through a main transformer high-voltage side circuit breaker; the low-voltage side of the main transformer is connected with a generator through a generator outlet enclosed bus; a generatorterminal voltage transformer is matched with the generator outlet enclosed bus; the output end of the generator terminal voltage transformer is connected with a synchronizing device through a generator terminal voltage secondary line; a high-voltage bus voltage transformer is matched with the high-voltage bus, and the output end of high-voltage bus voltage transformer is connected with synchronizing device through a bus voltage secondary line. According to the system and the method, the influence of the transformation ratio of the main transformer on the synchronous voltage can be eliminated by adjusting the rated voltage value of the side to be connected in parallel, the operation is simple, the efficiency is high, and the fuel is saved.

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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