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Method for controlling static frequency converter for starting synchronous unit

A technology of static frequency converter and synchronous unit, which is applied in the direction of control system, control generator, electrical components, etc., can solve the problems of synchronous unit start failure, start failure, frequency converter cannot operate normally, etc., and achieve the goal of reducing risk and start failure The effect of increasing the occurrence rate and the success rate of activation

Active Publication Date: 2018-04-03
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

If the DC bus current fails to establish, the inverter cannot run normally, and the synchronous unit fails to start
Therefore, it is necessary to provide a control technology that can reliably establish the DC bus current, so that the static frequency converter can operate normally, and overcome the disadvantages of failure to start the large-scale synchronous unit

Method used

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  • Method for controlling static frequency converter for starting synchronous unit
  • Method for controlling static frequency converter for starting synchronous unit
  • Method for controlling static frequency converter for starting synchronous unit

Examples

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Embodiment Construction

[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] like figure 1 As shown, a large synchronous unit is started with a six-six-pulse main circuit topology diagram. At the initial moment of starting a six-six-pulse static frequency converter, the rectifier bridge and inverter bridge need to have thyristor switching devices conducting at the same time to form a current path. like figure 2 As shown, the conventional double-narrow trigger pulses of the six-six-pulse static frequency converter used for the start-up of large synchronous units; according to the conventional trigger (that is, sequential trigger) pulse control mode, the thyristor switching devices T21 and T26 on the inverter bridge side give corresponding trigger pulses g21 and g26, but at this time there is no trigger pulse on the side of the rectifier bridge. According to this conventional trigger pulse...

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Abstract

The invention provides a control method of a static frequency converter for starting a synchronous unit. The method comprises an initial stage of the startup of the static frequency converter and a pulse commutation phase. An overlap trigger pulse is constructed on a trigger pulse of a switching device to ensure that the switching device is triggered to conduct to form a current path and quickly establish a DC bus current. The technical scheme provided by the invention can avoid the accident that a large-scale synchronous unit fails to start due to the fact that a frequency converter cannot establish a DC bus current in a forced commutation phase; and increases the startup success rate of the large-scale synchronous unit without increasing the hardware cost and reduces the risk of unit startup failure and the accident initiation rate of the startup failure.

Description

technical field [0001] The invention relates to a control method of a static frequency converter, in particular to a pulse trigger control method of a static frequency converter for preventing a synchronous unit from starting failure. Background technique [0002] Large-scale AC synchronous motors are widely used in industrial high-power occasions such as gas-fired power generation, pumped storage, and large-scale oil and gas transmission because of their advantages such as adjustable power factor, high motor efficiency, and operating power ranging from tens to hundreds of megawatts. The problem of large energy consumption caused by difficult start-up of large synchronous units has been widely concerned. The starting methods of large synchronous motors can be divided into mechanical and electrical; the mechanical starting adopts the method of coaxial external starter motor to drive the whole unit; the electrical starting adopts the frequency conversion speed regulation metho...

Claims

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Application Information

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IPC IPC(8): H02P9/00
CPCH02P9/00
Inventor 胡安平王德顺杨波姬联涛俞斌李官军周晨赵上林丁杰韩桂刚叶季蕾薛金花陶琼
Owner CHINA ELECTRIC POWER RES INST
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