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Active power filter based on boost direct current-direct current (DC-DC) conversion circuit

A technology of power filter and conversion circuit, applied in active power filter, AC network to reduce harmonics/ripple, harmonic reduction device, etc. Control complex problems, achieve the effect of compact structure, beneficial to large-scale production and obvious economic benefits

Active Publication Date: 2011-09-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the matrix converter requires a large number of bidirectional switch tubes, and the control is complicated, so the reliability of the converter itself is not high

Method used

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  • Active power filter based on boost direct current-direct current (DC-DC) conversion circuit
  • Active power filter based on boost direct current-direct current (DC-DC) conversion circuit
  • Active power filter based on boost direct current-direct current (DC-DC) conversion circuit

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Embodiment Construction

[0021] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] like figure 1 As shown, an active power filter based on a step-up direct AC-AC conversion circuit includes a phase A compensation circuit, a phase B compensation circuit and a phase C compensation circuit in a three-phase Y-connection.

[0023] The phase A compensation circuit includes a phase A inductor, a phase A film capacitor and four phase A IGBTs; among them, the phase A inductor L a One end of the power grid is connected to the A-phase busbar, and the A-phase inductance L a The other end of the first A-phase IGBTQ a1 collector and the fourth phase A IGBTQ a4 The emitter is connected, the first phase A IGBTQ a1 The emitter of the second A-phase IGBTQ a2 The emitter is connected to the second A-phase IGBTQ a2 colle...

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Abstract

The invention discloses an active power filter based on a boost direct current-direct current (DC-DC) conversion circuit. The active power filter comprises an A-phase compensation circuit, a B-phase compensation circuit and a C-phase compensation circuit, wherein the A-phase, B-phase and C-phase compensation circuits are connected in a Y shape. The filter uses a direct DC-DC conversion mode and can compensate for the reactive current and harmonic current of a grid by implementing a pulse width modulation on an alternative current switch and injecting even modulation harmonics to duty ratio. The phase compensation circuits of the invention are combined and sealed by using an alternative current load capacitor, a filter inductance connected grid and a power switch tube with an anti-paralleldiode and without a large-capacity energy storage device, so that the volume of the device is greatly reduced; the structure is simpler and more compact; the grid side current ripple is small; the parasitic parameter is small; and the maintaining and use cost of the device is greatly reduced; and considerable economic benefit is created.

Description

technical field [0001] The invention belongs to the technical field of electric power system filtering, and in particular relates to an active power filter based on a step-up direct AC-AC conversion circuit. Background technique [0002] The power quality is an important index in the power system, and the harmonic content is an important factor affecting the power quality. With the development of modern industrial technology, the nonlinear loads in the power system have increased greatly, such as rectifier loads, lighting, electric arc furnaces, etc. In recent years, the extensive use of power electronic devices has greatly increased the harmonic content in the power grid and further decreased the power quality. Harmonics in the power grid are extremely harmful. It deteriorates the environment in which electrical equipment is located, and brings harm to the surrounding communication systems and equipment outside the public grid. Various faults and accidents caused by harmon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/22Y02E40/40Y02E40/20
Inventor 邓焰刘全伟李楚杉彭浩何湘宁
Owner ZHEJIANG UNIV
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