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Centralized current sharing control method for excitation power cabinets

An excitation power cabinet and current control technology, which is applied in the direction of controlling the generator through the change of the magnetic field, can solve the problems of complicated software current sharing structure, limited hardware current sharing effect, and difficulty in project implementation, so as to reduce device damage and operation accidents , low cost and convenient modification

Active Publication Date: 2016-05-04
GUODIAN NANJING AUTOMATION
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AI Technical Summary

Problems solved by technology

The hardware current sharing effect is limited, and the project implementation is difficult; the software current sharing has disadvantages such as complex structure, difficult debugging, and high transformation costs.

Method used

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  • Centralized current sharing control method for excitation power cabinets
  • Centralized current sharing control method for excitation power cabinets
  • Centralized current sharing control method for excitation power cabinets

Examples

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0021] The current parallel operation mode of power cabinets consists of figure 2 As shown (taking 4 power cabinets as an example), a set of rectifier bridges is installed in each power cabinet. The AC side incoming lines of the power cabinets are connected in parallel, taken from the excitation power supply; the DC side outgoing lines are connected in parallel, and output to the generator rotor load.

[0022] After data sampling, analysis and calculation, the main control unit in the excitation adjustment device sends the pulse corresponding to the trigger angle to the pulse isolation and amplification circuit of the rectifier bridge of the power cabinet to drive the thyristor to work and cond...

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Abstract

The invention discloses a centralized current sharing control method for excitation power cabinets. The method is characterized by comprising power cabinets and a regulating device arranged in an excitation regulation cabinet, wherein the regulating device comprises a main control unit and a current sharing unit; a wire inlet side of an excitation source of each power cabinet is connected to a current transformer in series, and one current transformer is installed in each phase; and output ends of the current transformers are connected to the regulating device. The method has the following beneficial effects that equal distribution control of output current between the parallel running power cabinets is realized through the scheme, and except the regulating device with a current sharing function, the current transformers are only installed in the power cabinets; and furthermore, the method has good regulating performance, low cost and convenient transformation and can provide a solution for current sharing of the power cabinets, which is safe, reliable, lower in cost and easy to operate, for medium and large generator set excitation systems, the current sharing coefficient between the power cabinets is improved and the device damage and operation accidents caused by imbalanced output current are reduced.

Description

technical field [0001] The invention relates to a centralized current sharing control method for an excitation power cabinet, belonging to the technical field of electric control. Background technique [0002] The excitation system of modern large and medium-sized generators generally adopts the static excitation method of thyristor rectification. Due to the limitation of thyristor capacity and the need for redundant design of the power rectification part, the power rectification bridges are multi-bridge parallel operation. Due to the inherent differences in the hardware parameters of the power rectifier bridges running in parallel, with the continuous increase of the excitation current, the output current of the power rectifier bridges cannot be averaged and consistent. [0003] In order to evenly distribute the current among the bridges running in parallel, the existing hardware current sharing methods are: 1. Balanced reactor current sharing; 1. It is necessary to instal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/30
CPCH02P9/30
Inventor 朱红伟顾建嵘吴涛张绍峰王斌单华鹏彭刚刘玉林宋文渊
Owner GUODIAN NANJING AUTOMATION
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