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DC active power filter and its control method

A technology of power filter and control method, which can be applied in the direction of reducing harmonics/ripples and complex mathematical operations in DC circuits, and can solve problems such as low reliability, no fault tolerance function of DC active power filters, and poor ripple suppression effect And other issues

Active Publication Date: 2022-02-01
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a DC active power filter and its control method to solve the problems in the prior art that the DC active power filter has no fault tolerance function, poor ripple suppression effect, and low reliability

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  • DC active power filter and its control method
  • DC active power filter and its control method

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Embodiment Construction

[0026] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0027] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

[0028] refer to figure 2 , the embodiment of the present invention provides a DC active power filter, including: a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a first switch K2, a second switch K3, the first bidirectional switch Q1, th...

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Abstract

The present invention is applicable to the technical field of power electronics, and provides a DC active power filter and a control method thereof. The DC active power filter includes: a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube tube, the first switch, the second switch, the first bidirectional switch, the second bidirectional switch, the first capacitor and the second capacitor; when the switching tube fails, the first switch, the second switch, the first bidirectional switch and the second The switch state of the two-way switch reconfigures the topological circuit of the filter, connects the faulty phase to the midpoint of the first capacitor and the second capacitor, makes the system continue to run under this topology, and improves the fault tolerance of the system. After tube failure, it can still operate normally, with good ripple suppression effect and high reliability.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a DC active power filter and a control method thereof. Background technique [0002] AC-DC hybrid microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads, monitoring and protection devices. It combines the advantages of AC microgrids and DC microgrids. It has been widely used in the field of electric power. [0003] refer to figure 1 , when the DC subnet and the AC subnet in the AC-DC hybrid microgrid are connected through the AC-DC bidirectional DC-AC converter, due to the voltage asymmetry of the AC side grid and the unbalanced power component of the AC-DC interconnection power, the AC-DC Ripple component appears in DC bus voltage in hybrid microgrid. The existence of ripple pollutes the power quality of the power supply network and serio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/02G06F17/18
CPCH02J1/02G06F17/18
Inventor 高晓芝乔宇孙会琴田晋王磊陈灵芝
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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