Type-II doubly-fed variable-speed pumped storage unit

A technology of pumped storage unit and doubly-fed motor, which is applied in the direction of controlling generator, generator control circuit, control system, etc., and can solve problems such as unit operation consequences and shaft fracture
CN114243728AActive Publication Date: 2022-03-25HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Publication Date
2022-03-25

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Abstract

The invention discloses a Type-II doubly-fed variable-speed pumped storage unit, and belongs to the field of pumped storage. The output power of the Type-II variable speed unit is controlled by the hydraulic subsystem through a speed regulator; the rotating speed is controlled by the electrical subsystem through the back-to-back converter, the influence of a water hammer on the rotating shaft of the unit is smaller, and the rotating speed is not influenced. According to the method, transfer function models of the hydraulic subsystem and the electrical subsystem of the Type-II variable speed unit are also established; the frequency response effect of the variable-speed unit is considered, a power grid frequency response model is improved, and the improved model is more suitable for being applied to a modern power grid containing the variable-speed unit; a transfer function between an input load change and an output frequency is obtained based on an improved power grid frequency response model, and the stability of a system when key parameters change is analyzed and evaluated by applying a Nyquist stability criterion, so that the consequence caused by major frequency collapse of a variable speed unit and a power grid is avoided.
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Description

technical field

[0001] The invention belongs to the field of pumped storage, and more specifically relates to a Type-II double-fed variable-speed pumped storage unit. Background technique

[0002] As an advanced hydropower technology, the doubly-fed variable-speed pumped storage unit has the advantages of fast power adjustment speed, high operating efficiency, control flexibility and reliability compared with the traditional fixed-speed unit, and has become a new direction of development. The remarkable feature of the control of the variable speed unit is that the speed of the unit is adjusted by changing the opening of the guide vane through the governor, thereby affecting the mechanical power output by the pump turbine, and the back-to-back converter changes the AC excitation of the doubly-fed motor. Current to control the electromagnetic power of the unit. Due to the characteristics of variable speed operation, the variable speed unit is very suitable for application in...

Claims

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