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Control device and method for suppressing subsynchronous oscillation

A sub-synchronous oscillation and sub-synchronous technology, applied in the direction of control system, control generator, electrical components, etc., achieves the effect of low cost, simple structure and convenient control

Active Publication Date: 2010-12-08
CHINA SHENHUA ENERGY CO LTD +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the use of TCR+FC SVC technology to suppress subsynchronous oscillation is still blank at home and abroad. Therefore, it is necessary to invent a device and method for suppressing subsynchronous oscillation for multiple generator sets in large power plants to overcome the problem of subsynchronous oscillation. Drawbacks of the prior art

Method used

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  • Control device and method for suppressing subsynchronous oscillation
  • Control device and method for suppressing subsynchronous oscillation
  • Control device and method for suppressing subsynchronous oscillation

Examples

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Embodiment 1

[0032] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings by taking the connection of two generator sets as an example.

[0033] Please refer to figure 1 , Figure 2a , Figure 2b , the generator set subsynchronous oscillation dynamic stabilization device includes: connected to the traditional power grid and connected in sequence to the speed cabinet 3, the first controller 4, the second controller 5, the first three-phase TCR 6, the second three-phase TCR 7. The speed measuring cabinet 3 is connected with the first step-down transformer 8 and the second step-down transformer 9 . The above components are figure 1 , The structural schematic diagram shown in Fig. 2 is hooked in the traditional transmission network.

[0034] The first three-phase TCR 6 and the second three-phase TCR 7 are also respectively connected to the high-voltage power filter device FC. In the present invention, the high-vo...

Embodiment 2

[0056] The specific embodiment of the present invention will be further described in conjunction with the accompanying drawings by taking the connection of four generating sets as an example below. Only the parts that are different from those in Embodiment 1 are introduced below.

[0057] see image 3 , because there are 4 generators, i.e. generator A, generator B, generator C, generator D, so the speed measuring cabinet 3 needs to measure the speed signals of 4 generator sets at the same time, and then the speed signals W_a1, W_b1, W_c1 , W_d1 are output to the first controller 4 , and the speed signals W_a2 , W_b2 , W_c2 , ​​W_d2 are output to the second controller 5 . Other follow-up processing methods are the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to a multi-machine stabilization device and a multi-machine stabilization method for suppressing subsynchronous oscillation in a power system. The device comprises a speed measurement cabinet, a controller, a three-phase TCR and a step-down transformer which are connected to the conventional power grid and connected in turn. In the control method, the variation quantity of the rotation speed signals of a plurality of generator sets is used as control quantity, current flowing through the TCR is modulated by changing a thyristor conduction angle in the TCR system through controller operation, and finally the rotation speed of the generator is influenced so as to fulfill the aim of suppressing the subsynchronous oscillation. The device has the advantages of convenient control, simple structure, low cost and the like in the aspect of suppressing the subsynchronous oscillation; moreover, when the plurality of generator sets are arranged at the site, a signal processing unit can be expanded, and relevant components in other controllers are kept unchanged.

Description

technical field [0001] The invention relates to a multi-machine control device and method for suppressing subsynchronous oscillation in a power system. Background technique [0002] With the development of the power system, the operation of ultra-high voltage, long-distance transmission lines and large-capacity generator sets, as well as measures such as line series capacitance compensation and direct current transmission to improve the stability and transmission capacity of the power system, in addition to the accompanying In addition to the huge economic benefits, it also brings new problems to the safe and stable operation of the power system, one of which is the subsynchronous oscillation of the power system. [0003] Series capacitor compensation may cause sub-synchronous resonance in the power system, and then damage the shafting of the turbogenerator. Subsynchronous oscillations can cause damage to the shafting due to torsional stress. Shafting damage can be caused ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P9/00
Inventor 安万洙林惊涛王绍德武云生顾强卓华孙寿广王少波李海生孟会永车千里霍大渭尤建生杨文超刘爱晶
Owner CHINA SHENHUA ENERGY CO LTD
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