Eight-switch seven-level active power filter and control method thereof

A technology of power filter and control method, applied in active power filter, electrical components, circuit devices, etc., can solve problems such as leakage reactance of working frequency band, and achieve the effect of concise circuit topology, effective fault detection, and high cost performance.

Pending Publication Date: 2020-07-03
SHANGHAI DIANJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thirdly, how the coupling transformer is introduced in the simulation also brings new problems, such as winding connection, working frequency band and leakage reactance, etc.

Method used

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  • Eight-switch seven-level active power filter and control method thereof
  • Eight-switch seven-level active power filter and control method thereof
  • Eight-switch seven-level active power filter and control method thereof

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Embodiment Construction

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0050] The invention relates to an eight-switch seven-level active power filter, comprising:

[0051] The main circuit uses an eight-switch seven-level inverter as the main circuit topology.

[0052] The control circuit includes a harmonic acquisition sub-circuit and a switching tube duty ratio control sub-circuit. The harmonic acquisition sub-circuit is used to collect and detect harmonic currents. Its core is the detection method based on instantaneous reactive power theory. The DC side capacitor is equipped with PI control and re...

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Abstract

The invention relates to an eight-switch seven-level active power filter and a control method thereof. According to the invention, an improved seven-level control algorithm under an eight-switch circuit topology is adopted, and a conventional common SVPWM multi-level control algorithm is replaced, so that a plurality of problems caused by overlarge calculation amount of SVPWM are solved; a PWM generator of direct current conversion is used at the control front end of a switch tube to carry out complementary distribution of duty ratios, so that the variable duty ratio control is realized, and the problem of variable definition of module input parameters by using an s function is solved; switch case and an action system matched with the switch case are used for controlling a logic gate, so that eight switches are controlled to realize seven levels; and compared with the prior art, the eight-switch seven-level active power filter has the advantages that the loss problem caused by the number of switches is reduced, the calculated amount is reduced, and the like.

Description

technical field [0001] The invention relates to the technical field of power electronics and power quality, in particular to an eight-switch seven-level active power filter and a control method thereof. Background technique [0002] Any active power filter is composed of several common technical links, namely the harmonic detection link, control system, main circuit and coupling transformer. The harmonic detection link is based on the instantaneous reactive power theory and its derived harmonic detection method. The current technology generally improves and innovates the signal transmission delay. caused by high. Most of the current control systems are digital control systems, and the control systems are generally realized in the form of DSP, FPGA, or a combination of the two. There are various control methods, currently SVPWM is the main method. The main circuit can generally be divided into three-phase three-wire system and three-phase four-wire system according to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M1/08H02J3/18
CPCH02M7/483H02M1/08H02J3/1842Y02E40/20
Inventor 王星皓李梦达王猛
Owner SHANGHAI DIANJI UNIV
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