A Stability Criterion Method for Parallel Systems of DC Converters Based on Impedance Decomposition

A DC converter and system stability technology, applied in the field of power systems, can solve problems that are difficult to quantify, unclear in physical mechanism, difficult to find positive and negative damping of weak links in the system, etc.

A DC converter and system stability technology, applied in the field of power systems, can solve problems that are difficult to quantify, unclear in physical mechanism, difficult to find positive and negative damping of weak links in the system, etc.

CN113054640BActive Publication Date: 2022-04-22HUNAN UNIV +1
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  • A Stability Criterion Method for Parallel Systems of DC Converters Based on Impedance Decomposition
  • A Stability Criterion Method for Parallel Systems of DC Converters Based on Impedance Decomposition
  • A Stability Criterion Method for Parallel Systems of DC Converters Based on Impedance Decomposition

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Embodiment Construction

[0035] 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, not all, embodiments of the present invention. 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.

[0036] Such as figure 1 As shown in the figure, it is a flowchart of a method for determining the stability of a DC converter parallel system based on impedance decomposition in this embodiment, which mainly includes the following steps:

[0037] Step S1: Determine the mathematical model of the DC bus voltage at the common analysis node in the DC converter parallel system

[0038]For the stability judgment of multiple converters connected to the DC distributi...

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Abstract

The invention discloses a method for judging the stability of a DC converter parallel system based on impedance decomposition, and belongs to the technical field of power systems. The method of stability criterion is as follows: firstly, the mathematical model of the DC bus voltage at the common analysis node in the DC converter parallel system is determined; then, based on the Nyquist stability theorem, a method for judging the system stability based on the impedance of the source-load cascaded system is proposed ; Finally determine the dominant subsystem that causes instability at the instability frequency of the source-load cascade system, and correct the stability of the source-load cascade system. The invention can realize the impedance stability judgment of the DC power distribution system in a wide frequency range, analyze the system stability from the perspectives of positive and negative damping and resonance sources, and explain the instability from the aspect of physical essence, so as to reshape the impedance Provide guidance.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a method for judging the stability of a DC converter parallel system based on impedance decomposition. Background technique [0002] In a DC microgrid, there are a large number of power electronic components, motors, and loads connected to the DC bus through power electronic converters. The switching power supply device composed of switching power electronic components is affected by the switching characteristics and closed-loop control during operation, resulting in nonlinear characteristics of the input and output impedance characteristics of the power electronic power supply or load device. In particular, in order to ensure fast response characteristics, the power electronic load has its own input impedance characteristics showing negative impedance characteristics due to the introduction of negative feedback. With the increase of power electronic devices in the DC power ...

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Application Information

Patent Timeline
22 Apr 2022
Publication
CN113054640B
IPC
H02J1/00; H02J1/10
CPC
H02J1/102; H02J1/00
Inventors
帅智康; 吴向阳