Emergent switchover starting control method from water pumping to power generation of pump storage group

Abstract

The invention discloses an emergent switchover starting control method from water pumping to power generation of a pump storage group. Under a water pumping condition, after a guide vane is closed to the smallest opening degree and a generator switch GCB is disconnected, a rotary wheel loses the prime power in the water pumping direction, under the condition that the guide vane is not completely closed, water pressure from a pressure steel pipe forces the pump storage group to be braked and decelerated and pass through the zero rotation speed instantly, and then the pump storage group is immediately changed to be in a turbine steering direction and accelerated to the synchronous rotation speed, and grid-connected power generation is realized. The emergent switchover starting control method from water pumping to power generation of the pump storage group has the advantages that the pump storage group is stopped without inputting mechanical brake or electric brake, the work condition switchover time is effectively shortened, emergent response of a pumped storage power station when a power grid is abnormal is more effectively represented, and the safety function of the power grid is guaranteed.

Description

technical field [0001] The invention relates to the technical field related to the conversion of working conditions of a pumped storage unit, in particular to a start-up control method for an emergency conversion of a pumped storage unit from water pumping to power generation. Background technique [0002] The pumped storage unit is characterized by fast start-stop speed and flexible working condition conversion, which plays an extremely important role in power system regulation and emergency backup. By shaving peaks and filling valleys, the load curve is smoothed; by frequency modulation and phase modulation, the frequency and voltage stability of the power grid are effectively improved to ensure power quality; when abnormal conditions occur in the power grid, emergency response is made to ensure the safety of the power grid. The pumped storage power station is an effective management tool for the power grid, which guarantees the safe and economical operation of the power s...

AI Technical Summary

Problems solved by technology

The conversion from water pumping to power generation, under normal circumstances, returns to the static working condition first, and then starts to generate electricity. This start-up control method takes a long time, and in an emergency, it cannot provide urgently needed power to the power system as soon as possible.