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Lyapunov stability analysis method of time delay electric system

A technology of power system and analysis method, applied in the field of power system, can solve problems such as low efficiency of time-delay power system stability analysis and calculation

Inactive Publication Date: 2013-07-31
TIANJIN UNIV
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Problems solved by technology

[0007] The present invention aims to overcome the deficiencies of the prior art and solve the problem of low efficiency in the stability analysis and calculation of the original time-delay power system. Stability analysis method, comprising the steps of:

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  • Lyapunov stability analysis method of time delay electric system
  • Lyapunov stability analysis method of time delay electric system
  • Lyapunov stability analysis method of time delay electric system

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Embodiment 2

[0275] 3. Embodiment 2——Single machine infinite system

[0276] The value of the stand-alone infinite system and its parameters is the same as that of literature [4]. Table 4 gives the stability criterion based on the original TODE model (the original method) and the stability criterion based on the CTODE model (the new method) to solve the time-delay stability of the system respectively. The calculation result of the margin, the speedup ratio p in the table is defined as:

[0277] p = t TODE - t CTODE t TODE × 100 %

[0278] Among them, t TODE ,t CTODE is the time taken to solve for the delay stability margin with both models. The following rules can be seen from it:

[0279] 1)P m When changing between 1.00-1.04, the conservativeness of...

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Abstract

The invention belongs to the technical field of electric systems. In order to solve the problem of low stability analysis computing efficiency of the original time delay electric system, effectively reduce the dimensionality of a time delay differential equation and achieve higher computing efficiency, the invention adopts a technical scheme that a Lyapunov stability analysis method of a time delay electric system comprises the following steps of establishing a constraint time delay differential equation (CTODE) model of the electric system, rearranging and reorganizing system states in a manner that the states (z1 to z) not considering time delay influence are at the front and the states (z2 to z) considering the time delay influence are at the back, obtaining a CTODE model corresponding to the original time delay system, and basing on a new stability criterion of the CTODE model. The method is mainly applied to the electric system.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a Lyapunov stability analysis method of a time-delay power system. Background technique [0002] In nature, the future development trend of the system depends not only on the current state, but also on the past state. This kind of phenomenon is called time lag [1, 2]. Time lag widely exists in all aspects of the power system, but traditional control signals are mainly obtained from local measurement devices, and the time lag is very small, so it is usually not considered. However, in the wide-area environment, the time delay of the remote measurement link is very obvious, so it is of great practical significance to study the influence of the time delay on the stability of the power system [3,4]. [0003] Existing time-delay stability studies on power systems are mostly carried out based on the following time-delay differential equation (TODE) model: [0004] Δ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 余晓丹贾宏杰王成山
Owner TIANJIN UNIV
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