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Method for maintaining operation of coal supply machine frequency transformer when switching instantly electric power of

An operation method and coal feeder technology, applied in the direction of emergency power arrangement, conversion equipment for intermediate conversion to direct current, electrical components, etc., can solve problems such as oscillation and coal feed overshoot, and achieve simple system and stable operation Stable, Power Reliable Effects

Inactive Publication Date: 2008-10-01
BAOSHAN IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0008] Its shortcoming is that when the power supply system of the factory power supply system is switched due to instantaneous power failure or the short-term change of the power supply voltage exceeds ±15% of the rated voltage due to other reasons, all coal feeders in operation have a "trip-restart" process at the same time, although It can avoid triggering the "boiler main fuel off (MFT)" protection action and failure to stop the furnace, but the coal feeding amount of the coal feeder will produce overshoot and oscillation

Method used

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  • Method for maintaining operation of coal supply machine frequency transformer when switching instantly electric power of
  • Method for maintaining operation of coal supply machine frequency transformer when switching instantly electric power of
  • Method for maintaining operation of coal supply machine frequency transformer when switching instantly electric power of

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Embodiment

[0037] Taking the coal feeder manufactured by STOCK Equipment Company of the United States as an example, its frequency converter adopts the MC1450 voltage-type general frequency converter manufactured by ACTech Company. Its power circuit is divided into three branches. The main power supply is first connected to the main switch of the coal feeder, and then through three branches: one is connected to the voltage type frequency converter to drive the AC motor to run; the other is connected to the coal feeder control device (STOCK196NT ) control power isolation transformer; one way is connected to the control power isolation transformer of the coal feeder control circuit.

[0038] according to figure 2 According to the connection method, 3 lead wires are drawn from the DC link DC filter capacitor C of the inverter (such as: 2 series and 3 parallel connection method, 6 capacitors in total), and the energy storage capacitor C for the inverter configured according to the load of t...

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Abstract

The present invention relates to a technique for controlling the transducer of the coal supplying machine in the coal-fired power plant. A method for sustaining the operation when the electric power source of the transducer of the coal supplying machine is characterized in that the filtering capacitor C of the direct-current component DC on the main loop of the voltage type universal transducer is in parallel connected with an energy storing capacitor CS with corresponding electric capacitance according to the capacity magnitude of the load motor. An actuating charging resistor RS which has power matched with the resistance value according to the electric capacitance of the energy storage capacitor CS. Two routes of control electric power source of a control device and a control circuit of the coal supplying machine are provided with an UPS electric power source device. The technique according to the invention has the advantages of brief principle, smooth operation of the object driven by the transducer, good operability and safety, simple configuration and reliable electric power source.

Description

technical field [0001] The invention relates to a frequency converter control technology of a coal feeder in a coal-fired power plant, in particular to a method for maintaining operation when the power supply of the frequency converter is instantaneously switched off. Background technique [0002] In large-capacity units of coal-fired power plants, in order to improve the unit's ability to quickly restore power to the grid after certain failures, there is generally a "unit fast switch back (FCB)" function. This function can not only avoid the failure of boiler flameout and shutdown, but also reduce the impact loss of one start and stop impact on the equipment life of the boiler system, and has the ability to quickly restore normal power supply to the grid, and can obtain significant water, electricity and fuel savings. and other economic benefits. [0003] When the factory power system of a coal-fired power plant (such as: 6KV bus or 400V bus) is switched due to a certain f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06H02J15/00H02M5/44
Inventor 赵建中尚德松
Owner BAOSHAN IRON & STEEL CO LTD
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