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Obtaining apparatus for port impedance characteristic of alternating current power electronic module and obtaining method thereof

A technology for power electronic modules and impedance characteristics, which is applied in the field of acquisition devices for the port impedance characteristics of AC power electronic modules, and can solve problems such as inability to correctly describe the properties of modules, and cannot be used to determine the stability of interconnected systems

Inactive Publication Date: 2012-06-13
SHANGHAI MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such results cannot correctly describe the nature of the modules, nor can they be used to judge the stability of interconnected systems

Method used

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  • Obtaining apparatus for port impedance characteristic of alternating current power electronic module and obtaining method thereof
  • Obtaining apparatus for port impedance characteristic of alternating current power electronic module and obtaining method thereof
  • Obtaining apparatus for port impedance characteristic of alternating current power electronic module and obtaining method thereof

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Embodiment Construction

[0030] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0031] Such as figure 1 As shown, the acquisition device of the port impedance characteristics of the AC power electronic module described in the present invention includes a measured object 100, an equivalent load 200, an impedance analyzer (frequency response analyzer) 300 and a circuit connecting them. The circuit between 100 and the impedance analyzer (frequency response analyzer) 300 is further provided with a balance point phase detection device 400 and a disturbance phase control device 500 in sequence.

[0032] The balance point waveform phase detection device 400 determines the starting point of its cycle by detecting the waveform characteristics (such as zero-crossing point, peak point, etc.) of the disturbed object (periodic balance poi...

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Abstract

The invention discloses an obtaining apparatus for a port impedance characteristic of an alternating current power electronic module and an obtaining method thereof. The obtaining apparatus comprises a detected object, an equivalent load, an impedance analyzer (a frequency response analyzer) and circuits, wherein the circuits are used for connecting the detected object, the equivalent load, and the impedance analyzer (a frequency response analyzer). According to the invention, working point types of an alternating current power electronic module and a direct current power electronic module are distinguished; a phenomenon that a calculation result or a measurement result is changed randomly when there is high disturbance frequency can be explained and solved; and a calculation and measurement method of port impedance of an alternating current module is provided. And moreover, correct impedance characteristics of the port of the alternating current power electronic module at different disturbance frequency points can be obtained especially when the disturbance frequencies approach or exceed periodic balancing point frequency.

Description

technical field [0001] The invention relates to a device and method for acquiring port impedance characteristics of an AC power electronic module. Background technique [0002] "Module" generally refers to each power conversion device that is isolated from each other in space and relatively independent in function. The power conversion, transmission and application system formed by the high-frequency switching power electronic modules connected to each other through the bus bar is called a multi-module interconnected distributed power electronic system. [0003] The working state of the module in the interconnected system is not completely equal to the working state of the independent operation. When switching from independent operation to interconnected operation, even if the interconnection action itself does not change the operating point of any module, the entire system may still have instability such as bus voltage oscillation due to mutual coupling between module port...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 王润新汤天浩
Owner SHANGHAI MARITIME UNIVERSITY
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