Jump electric system time lag stability analyzing system and method based on Markov chain

A power system and analysis method technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as inability to systematically and effectively analyze, inability to analyze

Active Publication Date: 2014-06-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At this time, the method of solving the upper limit of the time delay for the non-jump situati

Method used

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  • Jump electric system time lag stability analyzing system and method based on Markov chain
  • Jump electric system time lag stability analyzing system and method based on Markov chain
  • Jump electric system time lag stability analyzing system and method based on Markov chain

Examples

Experimental program
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Effect test

Embodiment 1

[0143] (1) Introduction to the four-machine system.

[0144] Four machine system such as figure 2 As shown, the system has two areas, namely area 1 and area 2, area 1 contains generators 1 and 2, area 2 contains generators 3 and 4, and the tie lines 7-8 and 8-9 of the two areas are For double circuit. Among them, the generator adopts a 6-order detailed model, the excitation system adopts a fast excitation, and the load under the benchmark model adopts a 50% constant impedance and 50% constant current model.

[0145] First, the state matrix of the four-machine system is obtained by the modal analysis method, and the SMA method is used to reduce the order of the open-loop and closed-loop state matrices, as shown in figure 2 shown.

[0146] image 3 (a) is the characteristic root of the full-order open-loop state matrix and the reduced-order open-loop matrix, image 3 (b) is the characteristic root of the full-order closed-loop state matrix and the reduced-order closed-loo...

Embodiment 2

[0163] (1) Introduction of the sixteen machine system.

[0164] IEEE16-machine 68-node New England-New York interconnection system such as Figure 7As shown, the system can be divided into 5 major areas. Areas 1, 2, and 3 are equivalent systems respectively, Area 4 is the New York system, Area 5 is the New England system, and there are three tie lines between Areas 4 and 5, namely Line 1-2, Line 8-9, and Line 1 -27, where lines 1-2 and lines 8-9 are double circuit lines. The generator adopts a 6-order detailed model, the excitation adopts IEEE-DC1 type excitation, and the load model adopts the WECC load model, with 80% constant active load, 80% constant reactive impedance load, and 20% dynamic load.

[0165] First, use the SMA order reduction method to reduce the order of the system under the premise of ensuring that the input and output characteristics of the frequency band of interest remain unchanged. The frequency responses of the full order and the reduced order are as ...

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Abstract

The invention discloses a jump electric system time lag stability analyzing system and method based on a Markov chain, and belongs to the technical field of electric system stability analysis. The analyzing system comprises a data collecting module, a model building module, a stability analyzing module and a result outputting module, wherein the data collecting module, the model building module, the stability analyzing module and the result outputting module are sequentially connected. The analyzing method includes the steps that electric system parameters of a jump electric system under various operating conditions are collected; the mapping relation between the jump electric system and a Markov process is built; a jump electric system time lag state equation based on the Markov chain is built, and the order of the state equation is reduced; according to the state equation with the order reduced, jump electric system time lag stability criterions are determined; a jump electric system time lag stability upper limit is solved by using a generalized eigenvalue method. Under the condition of considering the jump characteristics of an electric system, the electric system time lag stability can be analyzed effectively.

Description

technical field [0001] The invention belongs to the technical field of power system stability analysis, and in particular relates to a time-delay stability analysis system and method of a Markov-based jump power system. Background technique [0002] The design of the feedback controller based on wide-area information has time-delay problems, which will inevitably lead to the decrease of the control effect of the controller, and even the occurrence of negative damping. Therefore, it is urgent to study the upper limit of the system's time-delay stability. [0003] At present, scholars at home and abroad have achieved a lot of beneficial results in the study of the upper limit of system time-delay stability, which can be mainly divided into two categories: time-domain methods and frequency-domain methods. The frequency domain method reveals the change law of the time-delay system to a certain extent by solving the transcendental characteristic equation, but the calculation pro...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 马静李俊臣高翔黄天意
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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