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Excitation system rectifier bridge thyristor conduction characteristic abnormity positioning method

A technology of excitation system and conduction characteristics, which is applied in the field of abnormal positioning of conduction characteristics of rectifier bridge thyristors of excitation systems, can solve the problems of inability to evaluate the quality, complex test methods of key parameters, and inability to locate abnormal thyristors, so as to shorten the maintenance time and improve the Timeliness, the effect of avoiding rectifier bridge failure

Pending Publication Date: 2021-10-19
CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD +2
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  • Application Information

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Problems solved by technology

[0004] At present, there are relevant studies on the factors affecting the thyristor control circuit and the AC and DC circuit impedance. Due to the complexity of the test method for key parameters of the thyristor component characteristics, after the excitation system is put into operation, only the open-loop small current test of the excitation system can be used to test whether each thyristor can be normally turned on. It cannot be verified, but its quality cannot be evaluated, that is, it is impossible to locate the abnormal thyristor. Therefore, its improvement and innovation are imperative

Method used

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  • Excitation system rectifier bridge thyristor conduction characteristic abnormity positioning method
  • Excitation system rectifier bridge thyristor conduction characteristic abnormity positioning method
  • Excitation system rectifier bridge thyristor conduction characteristic abnormity positioning method

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Experimental program
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Effect test

Embodiment 1

[0095] Take an excitation system connected in parallel by three rectifier cabinets as an example, and the thyristor adopts 5STP 18H4200. In normal operating conditions, in order to ensure the optimal output performance of each parallel rectifier bridge in the excitation system, the operating characteristics of each parallel rectifier branch and each arm thyristor of the rectifier bridge should be consistent, that is, the characteristic curves of each bridge arm thyristor should be as consistent as possible, each thyristor Under the same working condition, the conduction voltage drop should also be consistent (the conduction voltage corresponding to the 2000A conduction current of this model is 1.53V). A 300MW thermal power unit was used as a prototype to build a MATLAB / SIMULINK simulation model for simulation test verification. Typical parameters involved in the excitation system are as follows: AC incoming line voltage Uab=Ubc=Uca=941V, rated excitation voltage Ufn=327.5V, ra...

Embodiment 2

[0121] The basic assumption is consistent with that of Example 1. In this example, the conduction voltage drop of VT2 and VT6 is abnormal, and the conduction voltage drop of the other thyristors is normal. The following results can be obtained:

[0122] 1. Calculate JL + =0.99, JL - =0.94, at this moment, the threshold value M is 5%, JL + -JL - ≥0.05, it is judged that the abnormal thyristor is located in the negative bridge arm I1-, I2-, I3- of each rectifier bridge;

[0123] 2. Calculate the difference (average value) of the absolute value of the output current of the positive and negative bridge arms:

[0124] d i =||I i+ |-|I i- ||, where i=1, 2, 3;

[0125] d 1 =|864-912|=48A;

[0126] d 2 =|850-825|=25A;

[0127] d 3 =|857-833|=24A;

[0128] In summary d 1 The largest, i.e. abnormal thyristor is located in rectifier bridge number 1.

[0129] Combining 1 and 2, it can be seen that the abnormal thyristors are located in the negative bridge arms VT2, VT4, and...

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Abstract

The invention relates to an excitation system rectifier bridge thyristor conduction characteristic abnormity positioning method, and the technical scheme is that related data and waveforms in the operation of a generator are monitored, the working characteristics of all rectifier bridge thyristors of an excitation system are evaluated, and when a certain thyristor has conduction characteristic abnormity, rapid judgment and accurate positioning can be carried out. The method is high in judgment accuracy, facilitates the optimization and improvement of the current sharing capability of the excitation system, can effectively utilize the existing measurement and monitoring means to evaluate the working characteristics of the thyristors of the parallel rectifier bridge arms of the excitation system in real time, timely reflects the abnormality of the thyristors and the rectifier bridge, and can effectively avoid the fault of the rectifier bridge caused by the abnormal characteristics of the thyristors. And accident expansion is prevented. Meanwhile, the abnormal thyristors are quickly and accurately positioned on the basis of low-cost input, so that on-site operation and maintenance personnel can judge and process the abnormality, and the timeliness of problem processing can be greatly improved.

Description

technical field [0001] The invention relates to an excitation system of a synchronous generator, in particular to a method for locating the abnormal conduction characteristic of a rectifier bridge thyristor in the excitation system. Background technique [0002] As an important control link of generator output, the excitation system of synchronous generator has a direct impact on the safe and stable operation of the generator. The rectifier bridge is an important part of the excitation system of a synchronous generator set. The balance of its output current distribution is an important factor affecting the performance and safety of the excitation system, and it also has a certain impact on the service life of the excitation equipment. [0003] The main factors affecting the current sharing capability of the excitation system are the characteristics of the thyristor components, the thyristor control loop, and the impedance of the AC and DC loops. When the excitation equipmen...

Claims

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Application Information

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IPC IPC(8): G01R31/26
CPCG01R31/263
Inventor 李雅琪沈洪波赵伟程栗占伟郑豫生黄卫华刘园园赵增林
Owner CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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