Voltage stability prediction method for solving single-time cross-section problem

A voltage stabilization, time sectional technology, applied in the direction of AC network voltage adjustment, etc.

Inactive Publication Date: 2014-03-19
SHANGHAI JIAO TONG UNIV +3
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  • Abstract
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  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a voltage stability prediction method for so

Method used

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  • Voltage stability prediction method for solving single-time cross-section problem
  • Voltage stability prediction method for solving single-time cross-section problem
  • Voltage stability prediction method for solving single-time cross-section problem

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Embodiment

[0082] Identification of external system parameters

[0083] In this embodiment, the IEEE 14-node system is used as a simulation example, wherein node 1 is a reference node, and nodes 4, 5, 9, 10, 11, 12, 13, and 14 are load nodes. When the load node power increases, the simulation calculation using Matpower can obtain the voltage phasor and current phasor of each load node at different load growth rates λ, and make the following assumptions: Assume that these voltage and current phasors are load node The parameters of the external system equivalent model of each load node in each period can be obtained through the improved algorithm including the least square method identification of the measured quantity of the configured PMU device.

[0084] The loads of the load node 5 system all adopt constant power loads. Due to space limitations, Table 1 only lists the parameter results of the system equivalent model combined with the local equivalent network after the identification o...

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Abstract

The invention relates to a voltage stability prediction method for solving the single-time cross-section problem. The method comprises the following steps: 1) the voltage phasor and the current phasor of each load node at different load growth rates lambda are acquired; 2) the voltage phasor and the current phasor are taken as the measurement quantity of PMU, and parameters of an external system equivalent model of each load node in each period are acquired through identification including the least square method; 3) an impedance index LZ, a first load margin index Lbs and a second load margin index Lbss are acquired through calculation according to the parameters of the external system equivalent model; 4) and a voltage stability prediction index LVSPI is obtained according to the second load margin index Lbss and a sensitivity coefficient Csen based on the second load margin index Lbss. Compared with the prior art, the method of the invention has the advantage that nodes of a system which are most likely subjected to voltage unstability can be found out more accurately to buy time for the voltage stability control so as to improve the voltage stability control accuracy and other advantages.

Description

technical field [0001] The invention relates to a voltage stability prediction method, in particular to a voltage stability prediction method for solving the single-time section problem. Background technique [0002] With the promotion of west-to-east power transmission, national networking and power market, the spatial scope of the power system has been continuously expanded, forming a wide-area power system, making the stable monitoring and control of the power grid more and more important. Large-scale interconnected power systems The future direction of development is: wide-area real-time dynamic monitoring and control. The dynamic process of the power system has a wide range and the dynamic behavior is very complex. The abnormal operation conditions that have a greater impact on the power system mainly include: equipment overload, asynchronous operation, sub-synchronous resonance, low-frequency oscillation, voltage collapse, frequency collapse, Synchronous generators ru...

Claims

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Application Information

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IPC IPC(8): H02J3/12
Inventor 程浩忠张健郑真孙全才王琦宋越杨堤方斯顿刘丽平
Owner SHANGHAI JIAO TONG UNIV
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