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Method, system, medium and equipment for stabilizing balance point of grid-connected voltage source type converter

A voltage source type, stabilization method technology, applied in the field of electric power, can solve the problem of not getting the necessary and sufficient conditions for the stability of the system balance point, and achieve the effect of theoretical rigor

Active Publication Date: 2021-09-03
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, the existing stability analysis methods do not obtain the necessary and sufficient conditions for the stability of the system equilibrium point

Method used

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  • Method, system, medium and equipment for stabilizing balance point of grid-connected voltage source type converter
  • Method, system, medium and equipment for stabilizing balance point of grid-connected voltage source type converter
  • Method, system, medium and equipment for stabilizing balance point of grid-connected voltage source type converter

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Embodiment Construction

[0057] 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 some of the embodiments of the present invention, but 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 making creative efforts belong to the protection scope of the present invention.

[0058] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or Presence or addition of multiple other features, integers, steps, operations, elements, components and / or collections thereof.

[0059] It should also be understood that the terminology used ...

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Abstract

The invention discloses a method, a system, a medium and equipment for stabilizing a balance point of a grid-connected voltage source type converter. The method comprises the following steps: establishing a mathematical model that a VSC (Voltage Source Converter) containing a phase-locked loop is connected into an infinite system through a power transmission line; determining a balance point of the system under the output active power Pref and reactive power Qref of the specified VSC according to the steady-state equation of the system; establishing a linearization model of the system at the balance point according to the mathematical model and the balance point; and according to the linearization model, acquiring an analysis condition for stabilizing the balance point of the grid-connected VSC, and realizing the stabilization of the balance point of the grid-connected voltage source type converter.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a method, system, medium and equipment for stabilizing the balance point of a grid-connected voltage source type converter. Background technique [0002] In recent years, the influence of phase lock loop (PLL) on the stability of grid-connected voltage source converter (VSC) has attracted widespread attention in the power industry. Previous studies have used various stability analysis methods, such as eigenvalue analysis, impedance modal-based analysis (IMA), and passivity-based analysis, to study the stability of grid-connected converters. These studies show that shortening the electrical distance between the VSC and the system, reducing the load, increasing the reactive power output of the VSC and reducing the bandwidth of the PLL control can all improve the stability of the system. [0003] Furthermore, based on the modal analysis method and IMA it was fou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/46
CPCH02J3/381H02J3/46H02J2203/20
Inventor 李宇骏杜正春张雨萌陆艺源
Owner XI AN JIAOTONG UNIV
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