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AC-DC converter based on constant power load and control method thereof

A constant power load and control method technology, applied in the electric power field, can solve the problems of reducing the stability and reliability of the power grid system, and achieve the effects of improving stability and reliability, good dynamic performance, and eliminating static errors

Pending Publication Date: 2022-02-22
BEIJING INFORMATION SCI & TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, constant power loads may appear to exhibit negative impedance characteristics, which reduces the stability and reliability of the entire power grid system

Method used

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  • AC-DC converter based on constant power load and control method thereof
  • AC-DC converter based on constant power load and control method thereof
  • AC-DC converter based on constant power load and control method thereof

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Embodiment Construction

[0020] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0021] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, and do not exclude other elements or items. Words such as "connected" or "connected" are not limi...

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Abstract

The invention provides an AC-DC converter based on a constant power load and a control method thereof, and the method comprises the steps: obtaining a power observation value PCPL* of the constant power load based on an output current iodc and a DC side voltage vdc of a switch unit in the AC-DC converter; calculating a predicted value iod1* of the output active current of the AC-DC converter based on the power observed value PCPL*; performing nonlinear proportional-integral adjustment based on the output direct-current voltage vdc and the reference voltage vdc* to obtain a reference current correction value delta(iod*); obtaining a reference active component iod* of the AC output current based on the reference current correction value delta(iod*) and the predicted value iod1*; based on the reference active component iod* of the alternating current output current, the active component iod of the alternating current side line current, the reactive component ioq of the alternating current side line current and the reference reactive component ioq* of the alternating current output current, obtaining the active component vood and the reactive component voq of the output line voltage of the alternating current-direct current converter; and controlling a switch unit of the AC-DC converter based on the active component vod and the reactive component voq.

Description

technical field [0001] The present disclosure relates to the field of electric power technology, in particular to an AC-DC converter based on a constant power load and a control method thereof. Background technique [0002] With the development of distributed new energy, DC microgrid has been more and more applied. Connecting the AC distribution network through the AC-DC converter can greatly improve the power supply reliability of the DC microgrid. When the load converter is connected with a constant resistance, its output power is constant, showing constant power characteristics. However, in practical applications, constant power loads may appear to exhibit negative impedance characteristics, which reduces the stability and reliability of the entire grid system. Contents of the invention [0003] In view of this, the purpose of this disclosure is to propose an AC-DC converter based on a constant power load and its control method. [0004] Based on the above purpose, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M7/219
CPCH02M7/2173H02M7/219
Inventor 李建国张雅静王久和
Owner BEIJING INFORMATION SCI & TECH UNIV
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