Method and device for monitoring DC bus capacitance

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: 2020-06-02
DELTA ELECTRONICS (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method needs to change the normal operation mode, and the reference voltage of the module under test needs to be set separately

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  • Method and device for monitoring DC bus capacitance
  • Method and device for monitoring DC bus capacitance
  • Method and device for monitoring DC bus capacitance

Examples

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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 application provides a method for monitoring the capacitance of the DC bus capacitor of a power electronic converter, wherein the power electronic converter includes at least one AC-DC conversion circuit and a DC bus capacitor, and the power input and output interface of the AC-DC conversion circuit consists of a first terminal and a second terminal, the first terminal is connected to the AC power grid with frequency f, the second terminal is connected to the DC bus capacitor, f is any positive real number, the method includes: a parameter measurement step, measuring the two currents flowing through the DC bus capacitor The capacitance power of the frequency component times f and the voltage on the DC bus capacitor; and the capacitance calculation step, according to the capacitor power and the voltage on the DC bus capacitor, the capacitance of the DC bus capacitor is calculated. The present application also provides a device for monitoring the capacitance of a DC bus capacitor of a power electronic converter, the device comprising: a parameter measurement circuit capacitance 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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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
CPCG01R27/2605G01R31/64
Inventor 夏涛陆城
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD
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