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Photovoltaic multi-target power fluctuation suppression method based on improved double-dq control

A power fluctuation suppression and power fluctuation technology, which is applied in the field of power fluctuation suppression after photovoltaic inverters are connected to the power grid to achieve the effect of suppressing power fluctuations

Pending Publication Date: 2021-09-28
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the current control under the traditional dq axis has some obvious shortcomings and needs to be improved as an existing photovoltaic power fluctuation control method.

Method used

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  • Photovoltaic multi-target power fluctuation suppression method based on improved double-dq control
  • Photovoltaic multi-target power fluctuation suppression method based on improved double-dq control
  • Photovoltaic multi-target power fluctuation suppression method based on improved double-dq control

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0042] The embodiment of the present invention provides a photovoltaic multi-target power fluctuation suppression method with improved double dq control. In order to better describe the embodiment of the present invention, the specific embodiments of the present invention will be described in conjunction with the accompanying drawings, as follows figure 1 Shown is a schematic diagram of the implementation flow of an improved dual-dq control photovoltaic multi-target power fluctu...

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Abstract

The invention relates to a photovoltaic multi-target power fluctuation suppression method based on improved double dq control. The method comprises the following steps of: S1, performing d-axis and q-axis decoupling according to voltage and current output by an inverter when an asymmetric fault occurs in a power grid, realizing positive and negative sequence separation control, and establishing an inverter mathematical model based on improved double dq control; S2, proposing an improved relation equation of complex power according to the inverter mathematical model in the S1; S3, carrying out inverse operation on the improved relation equation of the complex power to obtain an improved relation expression of reference current and reference power; and S4, introducing a control factor capable of being flexibly switched into the improved relational expression, simplifying the improved relational expression, and under the condition that different values are switched, achieving multi-target power fluctuation suppression. Different control factors can be introduced according to multi-target power control requirements, so that the effect of multi-target power fluctuation suppression is achieved.

Description

technical field [0001] The invention relates to the field of methods for suppressing power fluctuations after a photovoltaic inverter is connected to a power grid, in particular to a method for suppressing active and reactive power fluctuations of a photovoltaic inverter when an asymmetric fault occurs in the power grid. Background technique [0002] In recent years, with the integration of more and more renewable energy into the power system, the power supply mode of the power system is undergoing tremendous changes. As one of the most typical renewable energy sources, photovoltaic power generation is connected to the power system through an inverter, and it meets the power generation requirements of the power system by controlling the active and reactive power output by the inverter. [0003] Photovoltaic grid-connected inverter is a full-power inverter, and its output power and current characteristics depend on the control strategy of the inverter itself. In actual opera...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/48H02J3/50H02J3/38H02J3/24
CPCH02J3/26H02J3/48H02J3/50H02J3/381H02J3/241H02J2300/24H02J2203/20Y02E40/50Y02E10/56
Inventor 尹俊
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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