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Medium-voltage parallel active power filter and control method

A technology of power filter and control method, which is applied in active power filter and AC network to reduce harmonics/ripples, etc., and can solve the problem of no neutral line in medium voltage systems

Pending Publication Date: 2021-06-22
BEIJING ETECHWIN ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The solution of using step-up transformer is a powerful supplement to the solution of cascaded multi-level technology of medium and high-voltage large-capacity active power filters. Its capacity can be large or small, the control is relatively simple, and the reliability is higher. The design of the type connection reasonably solves the problem of no neutral line in the medium and high voltage system, and the topology of the single-phase H-bridge is also convenient for independent control
The high-voltage side (grid side) of the three single-phase step-up transformers adopts an angle connection method, which solves the problem of no neutral line in the medium-voltage system

Method used

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  • Medium-voltage parallel active power filter and control method
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  • Medium-voltage parallel active power filter and control method

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Embodiment Construction

[0042] In order to enable those skilled in the art to better understand the present invention, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0043] The definitions of technical terms used in the present invention are as follows:

[0044] APF: Active Power Filter, active power filter, also known as active filter;

[0045] SVPWM: Space Vector Pulse Width Modulation, space vector pulse width modulation;

[0046] FFT: Fast Fourier Transform, fast Fourier transform, decomposes the periodic signal into a series of sinusoidal signals of different frequencies;

[0047] THD: Total Harmonic Distortion, total harmonic distortion.

[0048] figure 1 is a schematic diagram of an APF topology and signal measurement points according to an embodiment of the present invention.

[0049] Main Circuit Topology

[0050] Embodiments of the present invention are based on flux compensation parallel APF topology, ...

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Abstract

The invention provides a medium-voltage parallel active power filter and a control method. The medium-voltage three-phase parallel active power filter is characterized in that the active power filter comprises three single-phase H bridges; and three single-phase transformers the low-voltage sides of which are respectively connected to the corresponding one of the single-phase H bridges through filtering assemblies, and the high-voltage sides of which are all connected to a power grid. The high-voltage sides of the three single-phase transformers in the active power filter are in angle connection, and the low-voltage sides of the three single-phase transformers are in star connection.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular, the invention relates to a medium-voltage parallel active power filter and a control method. Background technique [0002] With the rapid development of high-voltage power grid and power electronic technology, the increase of a large number of power electronic equipment has caused increasingly serious harmonic pollution to the power grid, and the demand for medium and high voltage large-capacity active power filters is becoming more and more urgent. At present, there are mainly two schemes for the realization of medium-high voltage and large-capacity active power filters, one is to use cascaded multi-level technology, and the other is to use step-up transformers. [0003] Although the active power filter has experienced many years of development, and its application in low-voltage power distribution systems is becoming more and more perfect, its application in the medium-...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 张迅石志学
Owner BEIJING ETECHWIN ELECTRIC
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