Resonance suppression method of permanent magnet synchronous motor air-conditioner driving system without electrolytic capacitor

A technology of permanent magnet synchronous motor and motor drive system, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., can solve problems such as system resonance, achieve resonance phenomenon suppression, stability improvement, and amplitude weakening Effect

Active Publication Date: 2019-09-20
HARBIN INST OF TECH +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of resonance in the system after the electrolytic capacitor in the existing air conditioner drive system is replaced by a film capacitor, and propose a resonance suppression method for the permanent magnet synchronous motor air conditioner drive system without electrolytic capacitor

Method used

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  • Resonance suppression method of permanent magnet synchronous motor air-conditioner driving system without electrolytic capacitor
  • Resonance suppression method of permanent magnet synchronous motor air-conditioner driving system without electrolytic capacitor
  • Resonance suppression method of permanent magnet synchronous motor air-conditioner driving system without electrolytic capacitor

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specific Embodiment approach 1

[0025] Specific implementation mode 1: The specific process of the resonance suppression method of the electrolytic capacitor permanent magnet synchronous motor air-conditioning drive system in this implementation mode is as follows:

[0026] The present invention will be described in detail and completely below with reference to the accompanying drawings. to combine figure 1 and Figure 12 , the present invention proposes a resonance suppression method for an electrolytic capacitor permanent magnet synchronous motor air-conditioning drive system. The resonance suppression method is used to suppress the resonance phenomenon in the motor drive system, and specifically includes the following steps:

[0027] Step 1: The resonance phenomenon in the non-electrolytic capacitor drive system is caused by the resonance phenomenon between the DC bus capacitor and the filter reactor. In order to suppress the resonance phenomenon in the actual system, it is necessary to increase the syst...

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the resonance phenomenon in the non-electrolytic capacitor drive system in the step 1 is caused by the resonance phenomenon between the DC bus capacitor and the filter reactor. In the actual system In order to suppress the resonance phenomenon, it is necessary to maintain system stability and suppress resonance by increasing the system impedance. According to the parameters of the permanent magnet synchronous motor body and the control loop parameters of the vector control system, calculate the total input impedance of the permanent magnet synchronous motor drive system and the conditions for the stability of the motor drive system; the specific process is as follows:

[0035] When the permanent magnet synchronous motor is running, the impedance signal model of the motor drive system is established from the grid input side (that is, the impedance model viewed from the grid inp...

specific Embodiment approach 3

[0049] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the G dd , G dq The expression is as follows:

[0050]

[0051]

[0052] In the formula, G FOC is the motor model equation in the dq-axis coordinate system; F id is the current controller of the d-axis; F iq is the current controller of the q-axis; A is the band-pass filter; D is the delay time of the PWM drive control signal; G ud is the counter electromotive force coefficient.

[0053] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a resonance suppression method of a permanent magnet synchronous motor air-conditioner driving system without an electrolytic capacitor and relates to a resonance suppression method of a permanent magnet synchronous motor driving system. The invention is to solve the problem of resonance in the system after the electrolytic capacitor in an existing air-conditioner driving system is replaced by a thin-film capacitor. The method comprises the following steps: 1) calculating total input impedance of the permanent magnet synchronous motor driving system and conditions required for stability of the motor driving system; 2) processing bus voltage signals, extracting bus voltage fluctuation components, and multiplying the extracted bus voltage fluctuation components by a coefficient to obtain a system damping regulation signal; 3) selecting values of regulation parameters according to the calculated minimum input impedance meeting stability of the motor driving system; and 4) carrying out inverse park transformation on the damping regulating signals to enable dq axis damping regulating signals to be converted into alpha beta axis signals and superimposed on the alpha axis voltage and beta axis voltage portions. The method is used for the technical field of motor control.

Description

technical field [0001] The invention is applied in the technical field of motor control, and in particular relates to a method for suppressing resonance of a permanent magnet synchronous motor drive system. Background technique [0002] Permanent magnet synchronous motors are widely used in various industrial manufacturing fields due to their simple structure, reliable operation, and high power density. They are often used as outdoor compressors in household inverter air conditioning systems. In the traditional air conditioner motor drive system, a large-capacity electrolytic capacitor is usually used to suppress the bus voltage ripple, and a PFC circuit is introduced to adjust the grid-side power factor. However, electrolytic capacitors are greatly affected by temperature, and are easily damaged in an environment with a large outdoor temperature difference, resulting in failure of the air conditioning system. The large-capacity electrolytic capacitor can be replaced by a f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/05H02P21/14
CPCH02P21/05H02P21/14
Inventor 王高林白音赵楠楠张国强徐殿国
Owner HARBIN INST OF TECH
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