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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

Active Publication Date: 2022-03-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The torque oscillation wave generated on the rotating shaft will cause the shaft to break and have serious consequences for the operation of the unit

Method used

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

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Embodiment Construction

[0072] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0073] The present invention adopts a variable-speed unit with unique structure, which is called Type-II variable-speed unit. For this unit, the speed is directly controlled by the back-to-back converter, while the electromagnetic power is indirectly controlled by the governor. Therefore, compared with the traditional variable speed unit, after reasonable compensation control in the governor, t...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/38H02P9/00H02P101/10
CPCH02J3/24H02J3/381H02P9/007H02J2203/20H02P2101/10Y02E60/16Y02E10/20
Inventor 陈亚红徐伟刘毅毛志鑫
Owner HUAZHONG UNIV OF SCI & TECH
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