Method for judging stability of distributed power-supply system based on equivalent open-loop transfer function

A technology of open-loop transfer function and distributed power supply, which is applied in the direction of control/regulation system, regulation of electric variables, instruments, etc.

Inactive Publication Date: 2011-09-14
XI AN JIAOTONG UNIV
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[0004] In order to overcome the defects of the original stability judgment method, the present invention prop

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  • Method for judging stability of distributed power-supply system based on equivalent open-loop transfer function
  • Method for judging stability of distributed power-supply system based on equivalent open-loop transfer function
  • Method for judging stability of distributed power-supply system based on equivalent open-loop transfer function

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Embodiment Construction

[0044]The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Without loss of generality, a two-stage distributed power system composed of two Buck converters (such as Figure 4 Shown) as an example, numerical analysis and circuit simulation verification of the above stability analysis method. Specific parameters of the distributed power system: input voltage V i =24V, the expected bus voltage is V g =18V, the load resistance is R=5Ω, the expected output voltage V o =9V. Next, analyze the proportional coefficient of the source-level switching power supply control link and integral coefficient The stability of the entire system changes when a change occurs.

[0045] 1. Limitations of the Middlebrook impedance ratio criterion

[0046] Through the Routh stability analysis, it can be seen that under the above given parameters, the voltage transfer function of the load stage switching power sup...

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Abstract

The invention discloses a method for judging the stability of a distributed power-supply system based on an equivalent open-loop transfer function. The method comprises the following steps: firstly, equivalently transforming a noise sensitivity transfer function of the system, on the basis of an equivalent two-port network characteristic of a source switch power supply, and deducing the equivalent open-loop transfer function shown in the description; and then respectively measuring port voltages v1(s) and v2(s) by connecting a small signal current source delta (s) to a connection bus of a converter, acquiring the equivalent open-loop transfer function shown in the description under the small signal disturbance, and drawing a Gop(s) nyquist diagram; and lastly, judging the stability of the system and forecasting the stability margin of the system according to the nyquist diagram. By using the method provided by the invention, the restraining terms of the original impedance ratio standard are extended. Besides, the method provided by the invention is easily realized and has important theoretic sense and application value in analyzing and designing the distributed power-supply system.

Description

technical field [0001] The invention relates to the field of distributed power generation systems, in particular to a method for determining the stability of a distributed power system and predicting a stability margin. Background technique [0002] A distributed power system is composed of many switching power supply modules or subsystems. Usually, these power modules or subsystems are independently designed to ensure the stability of their own operation. However, when these modules or subsystems are integrated and connected, the interaction between them will often reduce the dynamic performance of the system, or even generate oscillations, resulting in the failure of the entire system to operate normally. Therefore, the stability analysis of distributed power systems has become one of the hotspots in the power electronics academic and engineering circles. [0003] Since Middlebrook proposed the impedance ratio criterion in 1976 (Middlebrook RD, "Input Filter Consideratio...

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Application Information

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IPC IPC(8): G05F3/02
Inventor 张浩杨晓平关为民李秀明马西奎
Owner XI AN JIAOTONG UNIV
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