Generalized stability criterion and application method for power electronic system

A stability criterion, power electronics technology, applied in broad stability analysis and application fields, can solve problems such as the inability to meet power electronic system analysis, and achieve the effect of expanding the scope of application

Inactive Publication Date: 2019-05-10
张欣
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Problems solved by technology

However, the traditional criterion only uses the analysis of the system under specific conditions, such as the minimum phase system can only be judged, only based on the special case of the Nyquist criterion, and with the continuous development of power electronics technology and the complexity of the system Ascension, the types of power electronic systems have far exceeded these specific situations, so it can no longer satisfy the analysis of all power electronic systems, such as non-minimum phase systems, so it is imperative to propose a generalized stability criterion for power electronic systems

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  • Generalized stability criterion and application method for power electronic system
  • Generalized stability criterion and application method for power electronic system
  • Generalized stability criterion and application method for power electronic system

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Embodiment Construction

[0030] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings, but it cannot be used to limit the scope of the present invention.

[0031] The present invention relates to a generalized stability criterion of a power electronic system and its application method, and proposes a generalized stability judgment and analysis method for complex systems such as non-minimum phase systems, which specifically includes the following steps:

[0032] Step 1: According to the transfer function of the power electronic system, infer whether the system is a non-minimum phase system; for a non-minimum phase system, according to the open-loop transfer function of the system, determine the number of poles P in the right half plane of the S plane; typical power electronic closed-loop control system such as figure 1 shown;

[0033] The open-loop transfer function of a power electronic system can be expressed as:

[0034] ...

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Abstract

The invention discloses a generalized stability criterion and application method for a power electronic system. When a condition that the number of poles of a system open loop transfer function in a right half plane of an S plane is equal to the number of turns of Nyquist curve anticlockwise surrounding points (-1, j0) of the open loop transfer function is satisfied, a closed-loop system is stable. According to the generalized stability criterion for the power electronic system provided by the invention, the generalized stability criterion is applied to a non-minimum phase system, a criterionapplication range is improved, and accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a generalized stability analysis and application method applied to power electronics systems. Background technique [0002] With the widespread application of renewable energy, the analysis of control loops and stability of power electronic systems is facing new challenges. The stability analysis of the traditional power electronic system has been developed for many years. It is simple and intuitive, which greatly simplifies the analysis and control of the system. However, the traditional criterion only uses the analysis of the system under specific conditions, such as the minimum phase system can only be judged, only based on the special case of the Nyquist criterion, and with the continuous development of power electronics technology and the complexity of the system As a result, the types of power electronic systems have far exceeded these specific situat...

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Application Information

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IPC IPC(8): G01R27/30
Inventor 张欣
Owner 张欣
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