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Method and device for monitoring capacitance value of direct-current bus capacitor

A technology of DC bus capacitor and DC bus, which is applied in the field of capacity value device and DC bus capacitor

Active Publication Date: 2018-06-15
DELTA ELECTRONICS SHANGHAI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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But this method needs to change the normal operation mode, and the r

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  • Method and device for monitoring capacitance value of direct-current bus capacitor
  • Method and device for monitoring capacitance value of direct-current bus capacitor
  • Method and device for monitoring capacitance value of direct-current bus capacitor

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Embodiment Construction

[0103] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

[0104] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the application. However, those skilled in the art will appreciate that the technical solutions of the present application may be practiced without one o...

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Abstract

The present invention provides a method and device for monitoring the capacitance value of the direct-current bus capacitor of the power electronic converter. The power electronic converter comprisesat least one alternating current/direct current conversion circuit and a direct-current bus capacitor. The power input and output interface of the alternating current/direct current conversion circuitconsists of a first end and a second end, wherein the first end is connected with an alternating-current grid of which the frequency is f, and the second end is connected with the direct-current buscapacitor, wherein f is any positive real number. The method includes the following steps of: a parameter measuring step; and a capacitance value calculation step. According to the parameter measuringstep, capacitor power having a double-f frequency component, which flows through the direct-current bus capacitor and a voltage on the direct-current bus capacitor are measured. According to the capacitance value calculation step, the capacitance value of the direct-current bus capacitor is calculated according to the capacitor power and the voltage on the direct-current bus capacitor. The present invention also provides a device for monitoring the capacitance value of the direct-current bus capacitor of a power electronic converter. The device compromises a parameter measurement circuit anda capacitance value calculation circuit.

Description

technical field [0001] The present application relates to the field of power electronics technology, in particular to a method for monitoring the capacitance of a DC bus capacitor of a power electronic converter, and a device for monitoring the capacitance of a DC bus capacitor of a power electronic converter using the method. Background technique [0002] In power electronics systems, the DC bus requires shunt capacitors to store energy. Capacitors used in this way are known as DC bus capacitors. Usually, high-capacity and high-voltage electrolytic capacitors are used as DC bus capacitors to store large amounts of energy. However, electrolytic capacitors can fail and age, causing system performance degradation or failure. [0003] For example, figure 1 It is a schematic diagram of a power electronic converter module 1000 in a phase of a power electronic transformer (PET) in the prior art. The power electronic converter module 1000 includes an AC / DC conversion circuit (A...

Claims

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Application Information

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IPC IPC(8): G01R27/26
CPCG01R27/2605G01R31/64
Inventor 夏涛陆城
Owner DELTA ELECTRONICS SHANGHAI CO LTD
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