Method, device, system and readable storage medium for obtaining harmonic command current
A technology of command current and acquisition method, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc. It can solve the problems of not considering the specific composition of harmonics, and it is difficult to obtain harmonic command current, so as to achieve accurate The effect of extraction
Inactive Publication Date: 2020-02-21
GUANGDONG UNIV OF TECH
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Problems solved by technology
Since this method only considers the influence of the AC volume generated after the coordinate transformation of the fundamental current, it does not consider the specific composition of harmonics
If a certain harmonic content is high, it is difficult to obtain a more accurate harmonic command current by this method
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[0055] The core of the present invention is to provide a method for obtaining a harmonic command current, which can quickly and accurately extract the harmonic command current of a single-phase active filter; another core of the present invention is to provide a method for obtaining a harmonic command current The acquisition device, system and a readable storage medium have the above beneficial effects.
[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative ef...
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The invention discloses a harmonic command current acquisition method which includes the steps: acquiring a load current value and a phase value of a single-phase active filter circuit; calculating the highest harmonic value in the load current value and a corresponding harmonic order value; calculating a d-axis component and a q-axis component of a fundamental component of load current, and a d-axis component and a q-axis component of harmonic; calculating direct-current amount after filtering of the d-axis component and the q-axis component of the fundamental component, and calculating direct-current amount after filtering of the d-axis component and the q-axis component of the harmonic; compensating the influence of the fundamental component and the harmonic on fundamental extraction bya compensation mode to obtain the d-axis component of the compensated fundamental component; acquiring harmonic command current according to the d-axis component of the compensated fundamental component. By the method, the harmonic command current of a single-phase active filter can be rapidly and accurately extracted. The invention further discloses a harmonic command current acquisition deviceand system and a readable storage medium which have the advantages.
Description
technical field [0001] The present invention relates to the technical field of active filtering, in particular to a method, device, system and readable storage medium for acquiring harmonic command current. Background technique [0002] In the modern industrial system, due to the continuous increase of rectifiers, frequency conversion speed control devices, electric arc furnaces, electrified railways and various power electronic equipment in the distribution network, the nonlinearity, impact and unbalanced power consumption characteristics of these loads have a great impact on the quality of power supply. cause serious impact. The electrical equipment of modern industrial, commercial and residential users is particularly sensitive to power quality, so higher requirements are put forward for the quality of power supply. Since the active filter technology can effectively compensate harmonics and reactive power, the filter characteristics are basically not affected when the sy...
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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 唐雄民吕叶卿黄冀成张淼
Owner GUANGDONG UNIV OF TECH