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Method for optimizing operating parameter of frequency control drive system of direct air cooling blower fan

A technology of frequency conversion speed regulation and operation parameters, which is applied in the direction of machine/engine, mechanical equipment, non-variable capacity pump, etc., can solve the problem that the output torque of the motor cannot meet the design and operation requirements, cables, motor burning loss, large operating current, etc. problems, to achieve the effect of increasing the system power supply voltage, improving the operation stability, and reducing the load pressure

Inactive Publication Date: 2011-07-20
西安兴仪控制系统有限公司
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  • Claims
  • Application Information

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Problems solved by technology

The main manifestations are: the output torque of the motor cannot meet the design and operation requirements, the operating current is large, and the heat generated by the frequency converter is large; the frequency converter causes the system to stop due to overheating protection alarms; The phenomenon of cable and motor burning is serious
After testing, when the working frequency of the motor is 50Hz~55Hz, the working current of the motor increases rapidly. Figure 5 As shown, the increase of the working current is extremely unfavorable to the normal operation of the inverter, and there are defects that may easily cause the inverter to overheat, cause the air cooling system to fail to work normally, and cause frequent faults

Method used

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  • Method for optimizing operating parameter of frequency control drive system of direct air cooling blower fan
  • Method for optimizing operating parameter of frequency control drive system of direct air cooling blower fan
  • Method for optimizing operating parameter of frequency control drive system of direct air cooling blower fan

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Embodiment 1

[0049] Some parameters of the direct air-cooled variable frequency speed regulation drive system of a power plant are as follows:

[0050] Motor (imported brand) technical parameters:

[0051] Rated power: Ped=110KW

[0052] Rated voltage: Ued=380VAC

[0053] Rated current: Ied=205A

[0054] Rated torque: T N =1051Nm

[0055] Rated speed: n ed =991rpm

[0056] During the high temperature season in summer, the ambient temperature is high (≥35°C), the output of the air cooling system is insufficient, and the cooling effect is not good, which will lead to high back pressure of the steam turbine unit and threaten the normal operation of the unit.

[0057] The normal operation parameter adjustment method is as follows (only considering the frequency converter):

[0058] Adjust the output frequency of the inverter to 55Hz, and the fan runs at 110% speed to improve the cooling effect.

[0059]In this state, the motor is running at constant power. Since the input voltage Uf of...

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Abstract

The invention discloses a method for optimizing operational parameters of a direct air-cooling fan variable frequency speed control drive system so as to solve the problem that when the system runs, a motor insufficiently output and the cooling performance can not meet the design requirements. The system comprises a supply transformer, a breaker, an incoming line alternating current filter, a transducer, an outgoing line alternating current filter, a cable, an electric motor, a reduction gearbox and a fan which are connected with each other. The method has the steps: (1) the input voltage of the transducer is increased to be 1.05-1.15 times of the rated voltage of the motor; (2) when the output frequency of the transducer is set to be 50Hz, the output voltage valve is 1.03-1.1 times of the rated voltage of the electric motor; (3) the output frequency of the transducer is set to be 44Hz-47Hz, which is corresponding to the rated revolution of the fan; (4) the output frequency of the transducer is set to be 48Hz-51Hz, which is corresponding to the maximum revolution of the fan. The method can reduce the working current of the system, increases the working voltage and output torque of the motor, reduces the heat productivity, saves electrical energy and solves the problem of high system failure rate.

Description

technical field [0001] The invention relates to a method for optimizing operating parameters of a direct air-cooling fan frequency-variable speed-regulating drive system in a power plant, in particular to a method for optimizing operating parameters of a direct air-cooling fan frequency-variable speed-regulating drive system. Background technique [0002] The status quo is that the failure rate of imported and domestic direct air-cooling fan variable frequency speed regulation drive systems currently in operation is very high, and the failure rate of individual engineering equipment is as high as 50% to 60%. The main manifestations are: the output torque of the motor cannot meet the design and operation requirements, the operating current is large, and the heat generated by the frequency converter is large; the frequency converter causes the system to stop due to overheating protection alarms; The phenomenon of cable and motor burning is serious. After testing, when the wor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00
Inventor 张建安韩春江劳庆海
Owner 西安兴仪控制系统有限公司
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