Control method capable of improving COP value of direct current variable-frequency compressor

A variable frequency compressor, DC frequency conversion technology, applied in the direction of pump control, liquid variable capacity machinery, mechanical equipment, etc., can solve the problems of inaccurate electrical angle delay of the compressor motor, and the COP value of the compressor cannot reach the maximum value, etc. Achieve the effects of easy implementation, reduced torque ripple, and high efficiency

Active Publication Date: 2010-10-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0003] During the operation of the variable frequency compressor, its actual back EMF and current waveform have different degrees of distortion, and the degree of distortion is related to the operating speed, which makes the electrical angle d...

Method used

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  • Control method capable of improving COP value of direct current variable-frequency compressor
  • Control method capable of improving COP value of direct current variable-frequency compressor
  • Control method capable of improving COP value of direct current variable-frequency compressor

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Embodiment Construction

[0033] The body of the DC variable frequency compressor motor is a brushless DC motor (BLDCM). In order to make the technical solution of this application easier to understand, the following is a brief description of the DC variable frequency control technology and the "back EMF zero crossing point" detection technology:

[0034] Simply put, the DC frequency conversion technology is to rectify the 50 / 60Hz AC voltage into a DC voltage. The brush and the rotor adopt permanent magnets, which rotate with the stator magnetic field, and the speed and torque can be adjusted by adjusting the energization frequency and voltage amplitude.

[0035] The driving circuit of the compressor motor discussed in the present invention is shown in figure 1 , the stator adopts Y-shaped windings, the three phases are U, V, W, and the drive circuit uses 6 IGBTs. Only two phases are turned on each time, and the other phase is turned off. Only one of the upper and lower bridge arms is turned on at the ...

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Abstract

The invention discloses a control method capable of improving the COP value of a direct current variable-frequency compressor, which is characterized by controlling an IGBT in a driving circuit of a variable-frequency compressor to perform advanced phase shift according to a preset advanced phase shift electrical angle phi to shift to the next conductive state. The method comprises the following steps: determining a target rotation speed of the variable-frequency compressor according to the size of the load of a cooling system; measuring the actual rotation speed of the variable-frequency compressor to determine if the actual rotation speed of the variable-frequency compressor is equal to the target rotation speed; finding out the advanced phase shift electrical angle corresponding to theCOP value under the rotation speed of the variable-frequency compressor according to the rotation speed to obtain the advanced phase shift electrical angle of the target rotation speed; subtracting the advanced phase shift electrical angle from a theoretically calculated phase shift delay electrical angle to obtain an actual phase shift delay electrical angle; and controlling the IGBT in the driving circuit of the variable-frequency compressor to delay the actual phase shift delay electrical angle and shift to the next conductive state. In the invention, the COP value of the variable-frequency compressor is improved by adopting a phase shift point advancing method to keep the motor of the compressor working at a largest (larger) torque state all the time and reduce torque fluctuation.

Description

technical field [0001] The invention relates to the field of small refrigeration compressors and direct current variable frequency motors, in particular to an energy-saving control method for small refrigeration compressor direct current variable frequency motor drivers. Background technique [0002] With the advent of the energy crisis worldwide, especially the environmental problems caused by global warming, we are increasingly required to implement a "low-carbon" economy. The refrigeration compressor is equivalent to the "heart" of the refrigeration system. Refrigerator air conditioners and other refrigeration equipment power consumption of the main components, the compressor COP value (Coefficient of performance, refers to the cooling capacity of the refrigeration compressor under a certain working conditions and the ratio of the power consumed, known as the coefficient of performance) improvement of the refrigerator The energy saving of air conditioners has a direct pro...

Claims

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Application Information

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IPC IPC(8): F04B49/06
Inventor 沈希黄跃进顾江萍王海炳胡娟蒋文奇
Owner ZHEJIANG UNIV OF TECH
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