Application of automatic switching mode of frequency converter of power station

An automatic switching and frequency converter technology, applied in the field of frequency conversion technology and microelectronics, can solve the problems of complex internal circuits, hidden dangers of furnace negative pressure adjustment, poor reliability of frequency converters, etc., and achieve the effect of non-disturbance switching

Inactive Publication Date: 2015-01-21
DATANG SANMENXIA POWER GENERATION
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In September 2013, during the A-level overhaul of unit #2, the frequency converters of the two induced draft fans of unit #2 in Sanmenxia Power Plant were upgraded. frequency start-up mode, and can realize the frequency conversion switching to power frequency operation mode triggered by the severe fault of the frequency converter, and manual switching between frequency conversion and power frequency. However, during the debugging and trial stage, it was found that the reliability of the frequency converter was poor, the internal circ

Method used

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  • Application of automatic switching mode of frequency converter of power station
  • Application of automatic switching mode of frequency converter of power station
  • Application of automatic switching mode of frequency converter of power station

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Experimental program
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Embodiment Construction

[0013] 1. A (B) induced draft fan control:

[0014] 1. A (B) induced draft fan start-up allowable conditions (AND logic):

[0015] Original logic:

[0016] ①A(B) The bearing temperature of the induced draft fan motor is less than 70°C;

[0017] ②A (B) The oil level of the high oil tank is normal;

[0018] ③A(B) The flue gas door at the outlet of the induced draft fan has been closed;

[0019] ④A(B) The inlet baffle of the induced draft fan is closed;

[0020] ⑤ The air duct on either side is unblocked (both induced draft fans are stopped and the air pre-heater is running, the flue gas baffle at the air pre- The fan is running.

[0021] ⑥ A (B) induced draft fan control circuit failure does not exist.

[0022] ⑦A(B) In the industrial frequency mode of the induced draft fan or the variable frequency mode of the induced draft fan, the high voltage switching of the induced draft fan frequency converter is allowed (according to the requirements of the manual, it has been conf...

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Abstract

The invention provides application of an automatic switching mode of a frequency converter of a power station. When power-frequency-to-variable-frequency switching of an induced draft fan is carried out during normal running of a unit, in order to be capable of meeting the running characteristics of the unit early, an inlet baffle of the induced draft fan can be manually adjusted by an operator, the furnace pressure is maintained stable, then power-frequency-to-variable-frequency switching of the induced draft fan is carried out, and then the baffle is manually adjusted by the operator to be at the preset opening degree after power-frequency-to-variable-frequency switching is successful. When variable-frequency-to-power-frequency switching of the induced draft fan is carried out, as the inlet baffle of the induced draft fan is basically located at the full-open position, an opening degree curve, corresponding to loads, of the opening degree of the inlet baffle of the induced draft fan needs to be increased to obtain the optimal adjustment mode, and after experiments, it is determined that the inlet baffle of the induced draft fan is limited to be at the opening degree of 60%.

Description

technical field [0001] The invention belongs to the field of applied frequency conversion technology and microelectronics technology, and in particular relates to an application of automatic switching modes of frequency converters in power plants. Background technique [0002] The induced draft fan of unit #2 in Sanmenxia Power Plant is a double-suction centrifugal type, equipped with Beijing Guodian Thinking SWdrive-MV06 / 2500 frequency converter. In January 2013, the frequency converter of unit AB of unit #2 successively caused the unit to stop due to serious faults of the frequency converter; the original quotation Both the power frequency and variable frequency start of the fan are in the knife switch mode, and the power frequency switching and frequency conversion, and the frequency switching power frequency can only be completed by stopping the fan, reducing the load, and turning on the oil. In this context, the operation of the induced draft fan on site urgently needs ...

Claims

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Application Information

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IPC IPC(8): F04D27/00
CPCF04D27/003
Inventor 王安生蔡碧波金彦昌赵艳红李智强胡庆伟秦建立冯超李鹏
Owner DATANG SANMENXIA POWER GENERATION
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