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Frequency conversion transmission system motor side common code impedance extraction method

An extraction method and technology of common mode impedance, applied in the field of extraction of common mode impedance on the motor side of variable frequency drive system, can solve problems such as error in the prediction result of common mode current of variable frequency drive system, change of motor port impedance, etc., and achieve good guiding significance and process. Simple and easy effects

Active Publication Date: 2016-05-25
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

However, when the system is running, the port impedance of the motor will change, and the small signal model will bring a large error to the prediction results of the common mode current of the variable frequency drive system

Method used

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  • Frequency conversion transmission system motor side common code impedance extraction method
  • Frequency conversion transmission system motor side common code impedance extraction method
  • Frequency conversion transmission system motor side common code impedance extraction method

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Embodiment Construction

[0044] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] The method for extracting the common mode impedance of the motor side of the frequency conversion transmission system of the present invention comprises the following steps:

[0046] (1) Measure the time-domain waveform of the common-mode voltage on the motor side of the variable frequency drive system;

[0047] like figure 1 As shown, three test capacitors C1 are star-connected on the output side of the inverter, P is the neutral point of the star-connected capacitor, O is the midpoint of the DC side of the inverter, and U po It is the common mode voltage on the motor side of the variable frequency transmission system, and the common mode voltage U is measured with a differential probe po When using time-domain waveforms, it is necessary to cons...

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Abstract

The invention discloses a frequency conversion transmission system motor side common code impedance extraction method. Through measuring time domain waveforms of a common mode voltage and a common mode voltage of a frequency conversion transmission system motor side and through subsequent mathematical calculation, a frequency spectrum characteristic of a frequency conversion transmission system motor side common code impedance is acquired. Compared to a traditional method of extracting an impedance parameter through an electromagnetic numerical calculation method and a network impedance analyzer, in the method of the invention, a complex motor or cable model does not need to be established and a process is simple and is easy to realize. During an impedance extraction process of the traditional method, a port impedance of a motor which does not work is extracted. And in the common code impedance extraction method of the invention, an influence of motor operation on the port impedance is considered so that a common mode current of a motor side can be accurately predicted.

Description

technical field [0001] The invention belongs to the technical field of power electronic electromagnetic compatibility modeling and prediction, and in particular relates to a method for extracting common-mode impedance of a motor side of a variable-frequency transmission system. Background technique [0002] Frequency converters have good operating characteristics and can bring significant energy-saving effects. Therefore, in recent years, frequency conversion drive systems have been widely used in fields such as electric power, machinery, metallurgy, and transportation, and have produced obvious economic benefits. However, due to its high-speed switching power switching devices, it also brings electromagnetic interference (EMI) problems that cannot be ignored, which not only seriously threatens the safe and stable operation of the system itself, but also poses a greater threat to other surrounding electrical systems. threaten. [0003] Take the IGBT widely used in inverters...

Claims

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Application Information

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IPC IPC(8): G01R27/08
Inventor 陈恒林严云帆
Owner ZHEJIANG UNIV
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