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Active filter for suppressing secondary ripples

A source filter, secondary ripple technology, applied in DC circuits to reduce harmonics/ripples, etc., can solve the problems of large inductance and capacitance, reduce system reliability and power density, etc., to suppress secondary ripple wave effect

Pending Publication Date: 2021-04-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
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  • Description
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Problems solved by technology

There are usually two ways to solve the secondary ripple of the DC bus voltage: passive filtering and active filtering. The passive filtering method is to connect a large enough capacitor or LC resonant circuit in parallel on the DC bus side to suppress the voltage ripple. The volume of the inductor and capacitor required to filter the low-frequency ripple is relatively large, which reduces the reliability and power density of the system

Method used

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  • Active filter for suppressing secondary ripples
  • Active filter for suppressing secondary ripples
  • Active filter for suppressing secondary ripples

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Embodiment Construction

[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings, but the implementation scope of the present invention is not limited thereto. 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.

[0025] figure 1 It is a schematic structural diagram of an active filter (APF) based on a single-phase voltage source converter (VSC) proposed in this paper. The active filter is composed of a series inductor L on the AC side of the VSC, and its DC side is connected to the outlet of the DC power supply where the secondary ripple needs to be suppressed when in use.

[0026] figure 2 It is a schematic diagram of the application of the active filter (APF) proposed in this paper. The working principle of the active filter includes the following...

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Abstract

The invention discloses an active filter for suppressing secondary ripples. The active filter is composed of a single-phase voltage source converter (VSC) alternating current side series inductor, and when the active filter is used, the direct current side of the active filter is connected to a direct current bus which needs to restrain the secondary ripples. Compared with the prior art, the active filter has the main technical characteristics that the amplitude and the phase of the alternating current side voltage of the active filter are controlled so that power ripples caused by the original alternating current load output power on the direct current bus are provided by the active filter provided in the invention; and the input power of the direct-current power supply is ensured not to contain pulsation components in the output power and is a constant value, and therefore the effect of restraining secondary ripples on the direct-current input side is achieved.

Description

technical field [0001] The invention relates to an active filter for suppressing secondary ripple. Background technique [0002] With the emergence of a large number of DC micro-sources represented by photovoltaics and the increase of DC loads, DC micro-grids are developing rapidly. When the DC microgrid supplies power to the AC load through the single-phase inverter, the double-frequency power pulsation contained in the AC output power is fed back to the DC input side, which will cause the secondary ripple component of the DC bus voltage, and the secondary voltage ripple It will cause disadvantages to both the DC side and the AC side, affecting its power quality, system stability, and equipment life. For example, for systems with photovoltaic panels or batteries connected in parallel on the DC side, their DC side equipment has low impedance characteristics, and the secondary ripple voltage will reduce the efficiency of the photovoltaic system and greatly shorten the servic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/02
CPCH02J1/02
Inventor 马振胡鹏涛焦伟超朱永强李欣怡
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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