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Beat frequency suppression method for electrolytic-capacitor-free permanent magnet synchronous motor driving system

A technology of permanent magnet synchronous motor and drive system, which is applied in motor generator control, electronic commutation motor control, AC motor control and other directions, can solve the problems of small-capacity film capacitors that do not have a voltage stabilization effect and system beat frequency, etc. Achieve the effect of improving the performance of the machine side, reducing the noise of the machine side, and suppressing the beat frequency phenomenon

Active Publication Date: 2020-12-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of beat frequency in the existing non-electrolytic capacitor permanent magnet synchronous motor drive system due to the fact that the small-capacity film capacitor does not have a voltage stabilizing effect, the present invention provides a non-electrolytic capacitor permanent magnet synchronous motor drive system beat frequency suppression method

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  • Beat frequency suppression method for electrolytic-capacitor-free permanent magnet synchronous motor driving system
  • Beat frequency suppression method for electrolytic-capacitor-free permanent magnet synchronous motor driving system
  • Beat frequency suppression method for electrolytic-capacitor-free permanent magnet synchronous motor driving system

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specific Embodiment approach 1

[0031] Specific implementation mode 1. Combination figure 1 As shown, the present invention provides a method for suppressing beat frequency of a permanent magnet synchronous motor drive system without electrolytic capacitors. The beat frequency suppression method is implemented on the basis of position sensorless vector control of the motor drive system, including:

[0032] Collect the bus voltage corresponding to the film capacitor in the driving system, make the bus voltage output the sample value of the bus voltage after passing through the sample holder ZOH, and then obtain the first harmonic sampling value of the bus voltage through the band-pass filter BPF; according to the first harmonic sampling value of the bus voltage The value is calculated in combination with the number of switching cycles of the inverter in the drive system to obtain the leading value of the first harmonic sampling value of the bus voltage;

[0033] Then calculate the leading value of the first h...

specific Embodiment

[0053] The effectiveness of the beat frequency suppression method proposed by the present invention is verified on the electrolytic capacitor permanent magnet synchronous motor drive system platform. The parameters of the experimental platform are set as follows: the grid voltage is 380V, the grid frequency is 50Hz, the DC bus capacitor is a film capacitor with a capacitance of 30μF, the d-axis inductance is 7.5mH, the q-axis inductance is 17.2mH, the back EMF constant is 210V, and the number of rotor pole pairs is 3, the rated power is 5.5kW, the rated frequency is 75Hz, and the stator resistance is 0.265Ω. All control algorithms in the experiment are completed in TMS320F28075. The update frequency of the switching and current and voltage sampling values ​​is set to 8kHz.

[0054] Figure 2 to Figure 6 is the experimental result of the beat frequency suppression method. It can be found that before adding the beat frequency suppression strategy, the phase a current i a The...

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Abstract

The invention discloses a beat frequency suppression method for an electrolytic-capacitor-free permanent magnet synchronous motor driving system, and belongs to the technical field of motor control. The invention aims to solve the problem that in an existing electrolytic-capacitor-free permanent magnet synchronous motor driving system, due to the fact that a small-capacitance thin-film capacitor does not have a voltage stabilizing function, beat frequency is generated by the system. The method comprises the steps: collecting the bus voltage corresponding to a thin-film capacitor in a driving system, wherein the bus voltage passes through a sampling holder ZOH and then a bus voltage sampling value is output, and then acquiring a first harmonic sampling value of the bus voltage through a band-pass filter BPF; calculating to obtain an advance value of a bus voltage first harmonic sampling value; calculating the lead value of the bus voltage first harmonic sampling value, the bus voltage sampling value and the bus voltage first harmonic sampling value to obtain an adjusted bus voltage instruction; and controlling, by a bus voltage instruction, the SVPWM in sensorless vector control, thus achieving the beat frequency suppression. According to the invention, the system beat frequency phenomenon can be effectively suppressed.

Description

technical field [0001] The invention relates to a beat frequency suppression method for a non-electrolytic capacitor permanent magnet synchronous motor drive system, belonging to the technical field of motor control. Background technique [0002] With the continuous development of modern motor drive technology, reliability and longevity have become key concerns for AC motor drive systems. At present, aluminum electrolytic capacitors are widely used in the DC link of voltage source converters to stabilize voltage and store energy due to their large capacity and high cost performance. half of the original), but it has become a weak link that affects the reliability of the motor drive system. According to statistics, about 60% of motor drive circuit failures are caused by DC bus electrolytic capacitors. [0003] Film capacitors have become the preferred solution to replace electrolytic capacitors because of their advantages such as long life, no acid pollution, and long-term ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/05H02P21/14H02P21/13H02P21/18H02P21/22H02P21/24H02P27/12
CPCH02P21/05H02P21/13H02P21/14H02P27/12H02P21/18H02P21/22H02P21/24
Inventor 王高林丁大尉赵楠楠张国强徐殿国
Owner HARBIN INST OF TECH