Flexible electric braking method of large-sized water turbine generator

A hydraulic generator and electric braking technology, which is applied in the direction of controlling generators, electrical components, control systems, etc., can solve problems such as braking failure, improve reliability, add new functions for braking and starting, and overcome braking Effects of Failure Defects

Inactive Publication Date: 2010-05-12
NARI TECH CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the disadvantage that the existing generator flexible electrical braking method is likely to cause braking failure, to provide a large-scale hydraulic generator flexible electrical braking method with a high success rate of electrical braking, and to solve many problems. Braking failure problem caused by parallel connection of two controllable rectifier bridges

Method used

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  • Flexible electric braking method of large-sized water turbine generator
  • Flexible electric braking method of large-sized water turbine generator
  • Flexible electric braking method of large-sized water turbine generator

Examples

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Embodiment Construction

[0016] The invention has been implemented on a certain large-scale hydroelectric unit, which solves the problem of long-term braking failure of some units.

[0017] Example: A large hydroelectric unit with a rated excitation current of 4000A, the excitation design uses 5 rectifier bridges connected in parallel, and the rated output of a single bridge is 1800A. During electric braking, the setting value of excitation current is 1900A, and during electric braking, the number of input rectifier bridges can be selected as Substituting the values ​​into n=2, 3, 4, the fewer the number of rectifier bridges participating in the output, the higher the rate of rise of the thyristor current, and the higher the success rate of braking. In this example, n is taken as 2 (the The smallest integer solution can also be used directly Solve the minimum integer solution), so when braking, the operation of 2 cabinets can be realized by cutting off the pulse of the other 3 bridges. After adopti...

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Abstract

The invention relates to a flexible electric braking method of a large-sized water turbine generator, which is suitable for a controllable rectification excitation system adopting the parallel running of a plurality of excitation rectification bridges for meeting the capabilities of excitation and excitation forcing. The invention has the core that the complete input of the traditional rectification bridges is improved into partial input. Because the number of the parallel rectification bridges is reduced, the ascension rate of current flowing through thyristors in rectification bridges input in the running is also increased correspondingly, and the current of the thyristors in the controllable rectification bridges exceeds the latching current of the controllable rectification bridges before triggering pulses disappear, thereby solving the problem of braking failure caused by the hysteresis effect of the induction of rotors and the effect of the latching current of the thyristors and ensuring the safe running of a water turbine generator set.

Description

technical field [0001] The invention relates to flexible electric braking technology for large hydraulic generators, and belongs to the technical field of generator electric braking. Background technique [0002] For large hydroelectric generating units, the huge moment of inertia makes the unit shut down too long. In order to prevent the thrust bearing of the unit from being damaged due to low speed for a long time, and to reduce the friction smog pollution caused by mechanical braking, in recent years, large-scale hydropower units at home and abroad have adopted a mechanical and electrical combined braking system: that is, during the shutdown process of the unit, when the speed When the speed drops to 50% of the rated speed, the electric brake is applied; when the speed drops to 15% or 10% of the rated speed, the electric brake is switched off and the mechanical friction brake is used. [0003] The principle of generator electrical braking is to set up a three-phase short...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/08
Inventor 胡先洪陈小明许其品程小勇万和勇孙素娟
Owner NARI TECH CO LTD
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