Unlock instant, AI-driven research and patent intelligence for your innovation.

A phase-locking method of active power filter

A power filter and filter inductor technology, applied in active power filtering, electrical components, circuit devices, etc., can solve problems such as inaccurate calculation of power grid synchronization phase information, achieve suppression, solve inaccurate calculation, and suppress DC bias. set effect

Active Publication Date: 2021-09-24
深圳市慧能互联科技有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] An embodiment of the present invention provides a phase-locking method for an active power filter, which aims to solve the problem of inaccurate calculation of grid synchronization phase information in the existing grid-free voltage sensor mode

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A phase-locking method of active power filter
  • A phase-locking method of active power filter
  • A phase-locking method of active power filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] figure 2 The implementation flow of the active power filter phase-locking method provided by Embodiment 1 of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

[0052] In step S10, the current on the grid side, the inductor current on the converter side, and the DC bus voltage on the converter side are collected, and the three-phase grid-side current on the grid side and the three-phase inductor current on the converter side are converted into The current component on the grid side and the current component on the converter side in the two-phase stationary coordinate system.

[0053] Wherein, in one embodiment of the present invention, it collects the three-phase grid current i on the grid side through a sampling circuit ga i gb i gc ;The three-phase phase current i of the converter side inva i invb i invc ; and the converter side bus vol...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention is applicable to electronic and electrical technology, and provides an active power filter phase-locking method. The method includes collecting grid-side current, converter-side inductor current, and converter-side DC bus voltage, and separately Transformed into grid-side current component, converter-side current component, and converter-side voltage component in the two-phase static coordinate system; the voltage component of the converter side is compensated by the compensation link to obtain the compensated voltage component, and the compensated The compensation voltage component is filtered by a low-pass filter to obtain the filtered voltage component; the virtual flux vector of the converter side voltage is constructed according to the filtered voltage component, and the initial value of the virtual flux vector is extracted by the inertial link to obtain the target virtual flux vector. Link vector: According to the target virtual flux link vector, the synchronous phase angle of the power grid is calculated through the calculation link. The invention realizes the grid synchronous phase angle estimation without the grid-side voltage sensor, and improves the reliability of the system.

Description

technical field [0001] The invention belongs to the technical field of electronics and electrics, and in particular relates to a phase-locking method for an active power filter. Background technique [0002] When a large number of electrical equipment such as frequency converters and rectifiers are connected to the grid, they will not only consume active power, but also generate more reactive power. Power supply efficiency, for the three-phase four-wire grid, if the three-phase load connected to the grid is asymmetrical, it will further cause the asymmetrical three-phase voltage output by the distribution transformer, which will not only increase the loss of the line, but also affect other electrical equipment. Active power filters can effectively compensate reactive power and harmonics flowing into the grid, thereby improving power quality. The active power filter needs to detect the synchronous phase information of the three-phase voltage of the power grid during operati...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/18H02J3/1821Y02E40/20
Inventor 肖英
Owner 深圳市慧能互联科技有限公司