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Method for monitoring ESR of direct-current bus capacitor of two-stage single-phase inverter

A technology of DC bus capacitors and single-phase inverters, applied in capacitance measurement, instruments, measuring devices, etc., to achieve the effect of simple circuit, accurate monitoring, and less data volume

Pending Publication Date: 2020-12-04
NANTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a lack of effective health monitoring methods for electrolytic capacitors on the DC bus side

Method used

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  • Method for monitoring ESR of direct-current bus capacitor of two-stage single-phase inverter
  • Method for monitoring ESR of direct-current bus capacitor of two-stage single-phase inverter
  • Method for monitoring ESR of direct-current bus capacitor of two-stage single-phase inverter

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0019] Such as figure 1 As shown, the present invention discloses a method for monitoring the ESR of the DC bus capacitor of a two-stage single-phase inverter, wherein the two-stage single-phase inverter includes an input power supply V in , DC-DC converter, inverter and load R o , input supply V in Connected to the input terminal of the DC-DC converter, the output terminal of the DC-DC converter is connected to the input terminal of the inverter, and the output terminal of the inverter is connected to the load R o , the method for monitoring the DC bus capacitor ESR of the two-stage single-phase inverter comprises the following steps:

[0020] Step A), the DC bus voltage v bus Obtain the AC component v of the DC bus voltage through the high-pass filter unit bus_ac ;

[0021] Step B), for the AC component v of the DC bus voltage bus_ac and i...

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Abstract

The invention discloses a method for monitoring the ESR of the direct-current bus capacitor of a two-stage single-phase inverter. The method comprises the steps that: 1, high-pass filtering is carriedout on direct-current bus voltage vbus to obtain a direct-current bus voltage alternating-current component vbus_ac; 2, performing synchronous sampling on the direct-current bus voltage alternating-current component vbus_ac and an inverter inductive current iL2; 3, denoising the sampled DC bus voltage AC component vbus_ac and the inverter inductive current iL2; 4, obtaining a peak value iL2_peakof the denoised inverter inductive current iL2 and a voltage break variable delta vbus_ac of the direct current bus voltage alternating current component vbus_ac at the corresponding moment; and 5, calculating the value of the ESR of the direct current bus capacitor according to the obtained peak value iL_2peak and the voltage break variable delta vbus_ac. The method provided by the invention doesnot need to add extra sampling points, does not affect the normal work of the converter, is simple and easy to implement, and provides a basis for the health monitoring of the capacitor.

Description

technical field [0001] The invention belongs to the technical field of inverters, and relates to a two-stage single-phase inverter DC bus capacitor health monitoring method, in particular to a two-stage single-phase inverter DC bus capacitor ESR monitoring method. Background technique [0002] At present, distributed power generation systems such as new energy, aircraft and electric vehicles are usually compatible with traditional low-voltage DC power supply system specifications, such as 28V, 42V and other DC power supplies. In order to obtain the 115V or 220V AC required by the load, it is usually necessary to adopt a two-stage structure - the front-stage DC-DC converter completes the inverter input and output voltage matching and electrical isolation, and the rear-stage inverter completes the DC-to-AC conversion and supplies the terminal power supply to the load. [0003] In the two-stage single-phase inverter, since the instantaneous output power of the latter stage inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor 任磊蒋泽宇吴锐赵家新张雷
Owner NANTONG UNIVERSITY
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