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Precharge control method and device for five-level active neutral-point clamped inverter

A control method and clamping technology, applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve problems such as increasing system cost, and achieve system cost reduction, safe pre-charging, Avoid the effect of peak current

Active Publication Date: 2019-02-01
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above two methods of precharging the floating capacitor Cf all need to add new hardware and increase the system cost.

Method used

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  • Precharge control method and device for five-level active neutral-point clamped inverter
  • Precharge control method and device for five-level active neutral-point clamped inverter
  • Precharge control method and device for five-level active neutral-point clamped inverter

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Embodiment Construction

[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] The invention discloses a pre-charging control method and device for a five-level active neutral-point clamping inverter, which can control the five-level active neutral-point clamping inverter without adding new hardware. The floating capacitor in the device is safely precharged.

[0069] The structure of the five-level active neutral point clamp inverter disclosed in the present invention is as follows: figure 1 As shown, it includes: a first energy ...

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Abstract

The invention discloses a precharge electrical control method of a five-level active midpoint clamping type inverter. The method comprises the following steps: adjusting an on-off state of a switch tube, and charging a suspension capacitor and a filtering capacitor through a capacitor in a first energy storage unit; in the charging process of the suspension capacitor and the filtering capacitor, when a first condition is satisfied, adjusting the on-off state of the switch tube, and discharging the filtering capacitor; in the discharging process of the filtering capacitor, when a second condition is satisfied, stopping discharging the filtering capacitor; if voltages of the suspension capacitor reach a set value, completing precharge; and otherwise, re-executing operation of charging the suspension capacitor and the filtering capacitor. According to the precharge control method disclosed by the invention, under the condition that new hardware is not increased, the suspension capacitor can be safely precharged. The invention further discloses a precharge control apparatus.

Description

technical field [0001] The invention belongs to the technical field of inverters, and in particular relates to a precharge control method and device for a five-level active midpoint clamping inverter. Background technique [0002] The emergence of active neutral-point clamped inverters makes up for the shortcomings of diode-clamped inverters and capacitor-clamped inverters. It not only uses fewer clamping devices, but also has a simpler control process. [0003] figure 1 The structure of the five-level active neutral point clamped inverter is shown, wherein the first energy storage unit includes an even number of capacitors connected in series, the first end of the first energy storage unit is connected to the positive pole of the power supply device, and the first The second end of the energy storage unit is connected to the negative pole of the power supply device, the first end of the first switching tube group is connected to the first end of the first energy storage un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M1/36
CPCH02M1/36H02M7/483
Inventor 徐君陈鹏曹金虎
Owner SUNGROW POWER SUPPLY CO LTD
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