Method for order reduction of impedance model into RLC circuit at resonant frequency

A technology of impedance model and circuit, which is applied in the field of reducing the order of the impedance model of the new energy power generation system at the resonance frequency, which can solve the problems of complex procedures, retention, and inapplicable reduction of the resonance characteristics of the new energy power generation system, and achieve simple calculation , a wide range of effects

Active Publication Date: 2020-04-10
HEFEI UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0005] 1) The model order reduction method suitable for integrated circuits, because the integrated circuit does not have the resonance problem of the new energy power generation system, so the retention of the resonance characteristics is not considered when reducing the order, so it is not suitable for the resonance characteristics of the new energy power generation system Downgrade;
[0006] 2) The method applicable to new energy power generation systems, because it only considers the application of subsynchronous resonance, mistakenly believes that there is only series resonance in the system, so it cannot be fully applied to new energy power generation systems;
[0007] 3) The simplified program is complex and requires complex mathematical transformations to reduce the order of the established model, which is not suitable for engineering applications

Method used

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  • Method for order reduction of impedance model into RLC circuit at resonant frequency
  • Method for order reduction of impedance model into RLC circuit at resonant frequency
  • Method for order reduction of impedance model into RLC circuit at resonant frequency

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Embodiment 1

[0052] Embodiment 1, the flowchart of the order reduction method of the present invention refers to the attached Image 6 , the schematic diagram of the impedance model see figure 2 ,Depend on figure 2 and Image 6 It can be seen that the method for reducing the order of the impedance model to an RLC circuit at the resonance frequency described in the present invention extracts the resonance characteristics of the impedance model of the new energy power generation system and realizes the model reduction through RLC circuit fitting. The specific steps are as follows:

[0053] Step 1, by measuring the impedance model of the new energy power generation system, the amplitude-frequency characteristics and phase-frequency characteristics of the new energy power generation system are obtained. Specifically, the amplitude-frequency characteristics are expressed by amplitude-frequency curves, and the abscissa and ordinate are frequency and amplitude, the phase-frequency characteris...

Embodiment 2

[0083] Example 2, see image 3 ,details as follows.

[0084] Step 1, by measuring the impedance model of the new energy power generation system, the amplitude-frequency characteristics and phase-frequency characteristics of the new energy power generation system are obtained. Specifically, the amplitude-frequency characteristics are expressed by amplitude-frequency curves, and the abscissa and ordinate are frequency and amplitude, the phase-frequency characteristic is expressed by a phase-frequency curve, and its abscissa and ordinate are frequency and phase, respectively. image 3 The upper figure in the figure is the amplitude-frequency curve, and the lower figure is the phase curve.

[0085] Step 2, according to the amplitude-frequency curve and phase-frequency curve obtained in step 1, define the resonance mode of the new energy power generation system:

[0086] Depend on image 3 It can be seen that when the phase curve crosses 0° for the first time, the corresponding ...

Embodiment 3

[0094] Example 3, see Figure 4 ,details as follows.

[0095] Step 1, by measuring the impedance model of the new energy power generation system, the amplitude-frequency characteristics and phase-frequency characteristics of the new energy power generation system are obtained. Specifically, the amplitude-frequency characteristics are expressed by amplitude-frequency curves, and the abscissa and ordinate are frequency and amplitude, the phase-frequency characteristic is expressed by a phase-frequency curve, and its abscissa and ordinate are frequency and phase, respectively. Figure 4 The upper figure in the figure is the amplitude-frequency curve, and the lower figure is the phase curve.

[0096] Step 2, according to the amplitude-frequency curve and phase-frequency curve obtained in step 1, define the resonance mode of the new energy power generation system.

[0097] Depend on Figure 4 It can be seen that when the phase curve crosses 0° for the second time, the correspond...

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Abstract

The invention provides a method for order reduction of an impedance model into an RLC circuit at a resonant frequency. According to the method, RLC circuit fitting is performed after parallel resonance or series resonance at a resonant frequency is judged through the obtained impedance model of the new energy power generation system, resonance characteristics of the impedance model of the new energy power generation system are extracted, and order reduction is realized through RLC circuit fitting. The method comprises the steps of obtaining the impedance model of the new energy power generation system through frequency sweeping or theoretical derivation, judging whether parallel resonance or series resonance exists at a resonant frequency or not, and carrying out RLC circuit fitting. The method provided by the invention is simple to implement, resonance information contained in the model can be subjected to order reduction only by obtaining the impedance model of the system, and the impedance model is subjected to order reduction to form the RLC circuit, so that the method has obvious superiority.

Description

technical field [0001] The invention relates to a method for reducing the order of the impedance model of a new energy power generation system at a resonance frequency, specifically a method for performing RLC circuit fitting after judging whether the resonance frequency belongs to parallel resonance or series resonance according to the obtained impedance model of the new energy power generation system, and extracting The resonance characteristics of the impedance model of the new energy power generation system and the order reduction method are realized by RLC circuit fitting. Background technique [0002] Under the background of high power electronics in the power system, when the grid-connected penetration rate is high, the internal coupling of the new energy power generation system constitutes a complex multi-scale high-order nonlinear network, which is easily affected by internal or external disturbances. The system is unstable. The increase of power electronic devices...

Claims

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Application Information

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IPC IPC(8): H02J3/38
Inventor 李飞王艺潮张永新刘洋马铭遥张兴
Owner HEFEI UNIV OF TECH
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