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Method and device for controlling three-phase alternating current system

A three-phase AC, control method technology, applied in the field of power electronics, can solve the problems of output voltage amplitude and frequency deviation from the rated value, and achieve the effect of suppressing harmonic components

Pending Publication Date: 2021-12-07
DELTA ELECTRONICS (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the virtual synchronous machine has no suppression measures for the harmonic content of the output current when it is connected to the grid, and it has no suppression measures for the harmonic content of the output voltage when it is running off-grid with asymmetric and nonlinear loads. The frequency will deviate from the rated value

Method used

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  • Method and device for controlling three-phase alternating current system
  • Method and device for controlling three-phase alternating current system
  • Method and device for controlling three-phase alternating current system

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Embodiment Construction

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and fully convey the concept of example embodiments to those skilled in the art.

[0050] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or other methods, components, means, steps, etc. may be employed. In other instances, well-known methods, apparatus, implem...

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Abstract

The invention provides a three-phase alternating current system and a control method thereof, and the method comprises the steps of receiving an output signal of the three-phase alternating current system, and obtaining a characteristic value of the output signal according to the output signal; performing virtual synchronous machine control on an inverter according to the characteristic value to obtain a fundamental wave potential; extracting a harmonic component in the output signal, and obtaining an error signal according to the harmonic component and a harmonic component reference value; controlling the error signal to obtain a harmonic compensation potential; superposing the harmonic compensation potential and the fundamental wave potential to obtain a control potential; and modulating the control potential to obtain a pulse signal, and obtaining a switching signal of the inverter according to the pulse signal. According to the technical scheme provided by the embodiment of the invention, the harmonic component in the output signal of the three-phase alternating current system can be suppressed under the control of the virtual synchronous machine.

Description

technical field [0001] The present invention relates to the technical field of power electronics, in particular to a control method and device for a three-phase AC system. Background technique [0002] At present, a large number of grid-connected inverters using power electronic equipment are put into the grid. The dynamic response of the inverter is fast but the moment of inertia is small, which is not conducive to the stability of the grid. [0003] The synchronous generator can maintain the stability of the grid voltage and frequency, and the grid-connected inverter with virtual synchronous machine performance can simulate the inertia and damping characteristics of the synchronous generator, provide transient power support when the load changes suddenly, and maintain the stability of the grid frequency. However, the virtual synchronous machine has no suppression measures for the harmonic content of the output current when it is connected to the grid, and it has no suppres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/38H02J3/01H02M1/12H02M7/53875H02P21/05
Inventor 陈丽王长永邱爱斌
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD