Closed loop compensation method and system based on DFT rotation transformation, and medium

A technology of rotation transformation and compensation method, applied in the field of harmonic compensation, which can solve problems such as difficulty in tracking load current and decrease in compensation accuracy

Active Publication Date: 2019-11-01
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, for rapidly changing loads, it is difficult for the frequency domain method to track the change of the load current, and the compensation accuracy decreases

Method used

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  • Closed loop compensation method and system based on DFT rotation transformation, and medium
  • Closed loop compensation method and system based on DFT rotation transformation, and medium
  • Closed loop compensation method and system based on DFT rotation transformation, and medium

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Embodiment Construction

[0117] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0118] According to a kind of closed-loop compensation method based on DFT rotation transformation provided by the present invention, comprising

[0119] Selected harmonic frequency signal generation steps: collect the grid voltage, obtain the sampling signal, input the obtained sampling signal into the phase-locked loop, and generate the sine sin(kw f t) signal and cosine cos(kw f t) signal, where k is the selected harmonic order, w f is the fundamental angular frequency, t represents time;

[0120]...

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Abstract

The invention provides a closed loop compensation method and system based on DFT rotation transformation, and a medium. The method comprises steps that selected harmonic frequency signal generating steps are as follows, a grid voltage is acquired, a sampling signal is obtained, the obtained sampling signal is inputted into a phase locked loop to generate a sinusoidal sin (kwft) signal and a cosinecos (kwft) signal of the selected harmonic frequency, k is the selected harmonic order, wf is the fundamental angle frequency, and t is the time; selected harmonic current acquisition steps are as follows, the grid current is acquired, through kth DFT transformation, kth synchronous rotation transformation, kth regulation and kth rotation inverse transformation, a real part of the transformationresult is extracted as the kth harmonic reference current and is taken as the selected harmonic current obtained. The method is advantaged in that combining advantages of DFT frequency domain transformation and synchronous rotation transformation, the response speed of a simple frequency domain transformation method is improved.

Description

technical field [0001] The present invention relates to the field of harmonic compensation, in particular to a closed-loop compensation method, system and medium based on DFT rotation transformation. Background technique [0002] The concept of the active filter (APF) has been proposed for more than 20 years. With the joint efforts of many scholars, the technology of the active filter has been quite mature and has been commercialized. It has gradually become a high-end market in the field of power filtering. mainstream products. With the deepening of commercialization and the intensification of market competition, users and manufacturers have put forward higher requirements for the performance of active filters, the most important of which are response speed and harmonic compensation accuracy. [0003] Harmonic detection methods can be divided into two categories: time domain methods and frequency domain methods. The time-domain method has an advantage in dynamic performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 蔡旭刘金虹
Owner SHANGHAI JIAO TONG UNIV
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