Control method and device for pumped-storage unit pumped phase-shifting to pumped-water condition

Abstract

The invention provides a control method and device for converting a pumping phase modulation mode into a pumping mode of a pumped storage unit, and relates to the technical field of energy storage ofelectric power. During the method, when the exhaust and backwater sub-process is performed and a ball valve is started, whether the exhaust and backwater sub-process is finished and whether the opening degree of the ball valve is larger than a preset percentage value are judged; timing is carried out when the exhaust and backwater sub-process is finished and the opening degree of the ball valve islarger than the preset percentage value; when timing time reaches a preset time threshold value, a phase modulation mode of resetting a speed regulator is carried out; the water pump direction of thespeed regulator is controlled to open a guide vane; a water pump protection mode is selected; and when the ball valve is fully opened, the process of converting the pumping phase modulation mode intothe pumping mode is reset, so that the ball valve opening command is invalid, and the pumped storage unit enters a water pumping steady state. According to the control method and device for converting the pumping phase modulation mode into the pumping mode of the pumped storage unit, the fatigue damage effect caused by overlong pressure forming time to the unit can be reduced, time of convertingthe pumping phase modulation mode into the pumping mode can be shortened, and the response speed required on a power grid can be increased.

Description

technical field [0001] The invention relates to the technical field of electric energy storage, in particular to a control method and device for pumping and phase-changing pumping working conditions of a pumped storage unit. Background technique [0002] The pumped storage unit is a power generation pumping device that converts the remaining electrical energy into mechanical energy when the power load is low, pumps the water from the lower reservoir to the upper reservoir, and converts the potential energy of the upper reservoir water into electrical energy by releasing water during the peak period of power load. Due to the rapid response and flexible operation mode of the pumped storage unit, it has various functions in the power system, such as peak regulation, valley filling, frequency regulation, phase regulation, emergency backup and black start, which play an important role in the safety, stability and economic operation of the power grid. effect. In addition, large-s...

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Problems solved by technology

[0004] Embodiments of the present invention provide a method and device for controlling the pumping-storage unit's pumping-phase-adjusting-to-pumping working condition, so as to solve the problem that the pumping-storage unit's pressure build-up time is too The fatigue damage caused by the long-term operation of the unit and the problem of affecting the duration of the conversion of working conditions

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