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Method for acquiring equivalent impedance model of flexible direct current converter under V/f control

A flexible DC and equivalent impedance technology, applied in the direction of converting AC power input to DC power output, AC network circuits, power transmission AC networks, etc., can solve the problem that the impedance modeling of flexible DC converters is still in its infancy and cannot be accurately Obtain the impedance characteristics of the flexible DC converter accurately and achieve the effects of simplified impedance model, accurate impedance characteristics and strong flexibility

Active Publication Date: 2021-08-03
CHINA THREE GORGES CORPORATION +3
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Problems solved by technology

[0004] At present, for grid tracking control strategies such as constant power and constant DC voltage, research on impedance modeling of flexible DC converters is relatively mature. However, impedance modeling of flexible DC converters under constant AC side voltage control strategies is still in its infancy. stage
In the prior art, when researching the impedance modeling of the flexible DC converter under the constant AC side voltage control strategy, the system is simplified and the influence of some control links is ignored, so that the constant AC side voltage cannot be accurately obtained. Impedance Characteristics of Flexible DC Converter under Control

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  • Method for acquiring equivalent impedance model of flexible direct current converter under V/f control
  • Method for acquiring equivalent impedance model of flexible direct current converter under V/f control
  • Method for acquiring equivalent impedance model of flexible direct current converter under V/f control

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Embodiment Construction

[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0059] see figure 1 , figure 1 It is a schematic flowchart of a preferred embodiment of a method for obtaining an equivalent impedance model of a flexible DC converter under V / f control provided by the present invention. The method for obtaining the equivalent impedance model of the flexible DC converter under V / f control includes:

[0060] S1, assuming that under the control of the fixed AC side voltage V / f, the grid-connected point voltage and cur...

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Abstract

The invention discloses a method and device for obtaining an equivalent impedance model of a flexible direct current converter under V / f control and a storage medium, and the method comprises the steps: supposing that the grid-connected point voltage and current of the flexible direct current converter respectively comprise a steady-state fundamental component and positive and negative sequence small signal harmonic components; acquiring voltage dq-axis components and current dq-axis components through a sampling link and Park transformation; inputting the voltage dq-axis component and the current dq-axis component into a controller to obtain the valve side voltage of the flexible DC converter, wherein the controller comprises a voltage outer loop control link, a current inner loop control link, a current decoupling control link, a voltage feedforward control link, a dq axis inverse transformation link and a system modulation and link delay link; and performing integrated calculation on the valve side voltage and a primary system circuit to obtain a positive sequence impedance model and a negative sequence impedance model of the flexible DC converter. The control links considered by the method are complete, and the obtained impedance model of the flexible DC converter can accurately reflect the impedance characteristics of the converter.

Description

technical field [0001] The present invention relates to the technical field of power systems, in particular to a method, device and storage medium for obtaining an equivalent impedance model of a flexible DC converter under V / f control. Background technique [0002] The flexible DC transmission technology based on the modular multilevel converter (MMC) has the advantages of flexible control, low harmonic content of the output voltage, and the ability to supply power to passive systems. widely used. Since both the wind turbine converter and the MMC are power electronic devices with wide frequency response characteristics, when the wind farm is sent through the flexible DC transmission system, there is interaction between the wind turbine converter and the flexible DC power transmission system. It is easy to cause the problem of resonance instability, which has become one of the main factors restricting the wind power transmission capacity of the flexible DC transmission syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M7/483
CPCH02J3/36H02M7/483H02J2003/365H02J2203/20Y02E60/60
Inventor 刘淑军冯俊杰雷肖邹常跃胡德芳赵晓斌刘宇李岩杨张斌傅闯翟冬玲许树楷张鹏杨双飞韩雷岩王琦杨知化张险峰傅广泽
Owner CHINA THREE GORGES CORPORATION
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