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Small interference oscillatory stability decomposed model analysis method for electric power system

A power system and modal analysis technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as deepening analysis and calculation understanding, difficulties, and inability to clearly analyze calculations and power systems

Inactive Publication Date: 2010-12-15
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

This kind of modal analysis cannot express the physical process of the source, distribution and transmission of indicators, and cannot clearly link the analysis and calculation with the physical quantities of the power system, especially the generator in the system, which is a specific device that is closely related to the source of low-frequency oscillations. Get up to deepen your understanding of analytical computing
Therefore, this kind of modal analysis is often difficult to analyze and explore the low-frequency oscillation mechanism in the power system, because it only gives a numerical calculation result

Method used

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  • Small interference oscillatory stability decomposed model analysis method for electric power system
  • Small interference oscillatory stability decomposed model analysis method for electric power system
  • Small interference oscillatory stability decomposed model analysis method for electric power system

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Embodiment Construction

[0092] The present invention will be further described below in conjunction with the accompanying drawings.

[0093] as attached Figure 5 Shown is a simple four-machine two-area power system, through Figure 5 The shown system illustrates the specific implementation process of the decomposition calculation method of modal analysis proposed by the present invention. The object of the modal analysis is a battery energy storage system (BESS: battery energy storage systems) installed on the connection line of the second area. The content of the modal analysis is to predict the damping effect of adding a damping controller on the BESS. The parameters of the four-machine two-area power system are:

[0094] x T1 =0.0027,X T2 =0.0067,X T3 =0.0027,X T4 =0.0067,

[0095] x 12 =0.004,X 26 =0.22,X 56 =0.22,X 45 =0.01,X 34 =0.004,

[0096] L 2 =0.2,L 5 =4.0

[0097] m i =8s.,D i =0,X di =0.8,X di '=0.2,X qi =0.4, T d0i '=5,K Ai =100, T Ai =0.01

[0098] 1. BESS l...

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Abstract

The invention discloses a small interference oscillatory stability decomposed model analysis method for an electric power system. Decomposition calculation is carried out on mode analysis of common calculation residual error Ri so as to realize a model analysis calculation result with clear physical significance. The small interference oscillatory stability decomposed model analysis method comprises the steps of: firstly, measuring stable data and static data of the electric power system; and then respectively calculating a channel factor, a reconstruction factor and a participation factor toobtain model analysis of the residual error R1 for decomposing a calculation result, wherein based on the decomposed calculation result, the internal principle of influencing the damping by a controller is clearly disclosed so as to realize the adjustment of an additional damping controller and further effectively inhibit the low-frequency oscillation of the electric power system. The small interference oscillatory stability decomposed model analysis method can clearly detailedly give that how an appointed controller or device influences the electromechanical oscillation model of the appointed electric power system, thereby providing guidance with clear physical significance for the small interference stability analysis and the control design.

Description

technical field [0001] The invention relates to a dynamic stability analysis method of a power system, in particular to a decomposition mode analysis method for small disturbance oscillation stability of a power system. Background technique [0002] The low-frequency oscillations that occur in power systems originate from the relative swing between the rotors of generators or generator groups. It is the continuous oscillation of active power in the system caused by the lack of damping when there is a local surplus or lack of active power in the system, and the relevant generators or generator groups are accelerated and decelerated to achieve active power balance. The frequency range of oscillation is generally between 0.2 and 2.5Hz, so it is called low-frequency oscillation, or electromechanical oscillation. In recent years, low-frequency oscillations have occurred frequently in our country, seriously affecting the power transmission and safe and stable operation between po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 杜文娟王海风陈中
Owner SOUTHEAST UNIV
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