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Method for weighting dynamic voltage stability margin index

A technology of stability margin and dynamic voltage, applied in the direction of measuring current/voltage, measuring electricity, measuring electric power, etc., can solve problems such as truncation error

Active Publication Date: 2009-03-18
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
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Problems solved by technology

[0022] (4) Truncation error

Method used

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  • Method for weighting dynamic voltage stability margin index
  • Method for weighting dynamic voltage stability margin index
  • Method for weighting dynamic voltage stability margin index

Examples

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Embodiment Construction

[0079] A simple system with 3 machines and 9 nodes (the wiring diagram is attached figure 2 ) is a simulation example, calculating the dynamic margin to further illustrate the implementation steps of this method:

[0080] 1. Establish the data of the 3-machine 9-node system, and determine that the load model required for system calculation is a 100% constant impedance model;

[0081] 2. Computational preparation

[0082] Confirm that the system load is a constant impedance load, and the load increases under the condition of no fault in the system, fill in the generator excitation current protection card and the on-load tap changer (ULTC) action card according to actual requirements.

[0083] 3. Select bus A in the system as the load growth area, the growth rate is 1% of the normal mode of growth per second, and the growth time is 800 seconds.

[0084] 4. Simulation calculation

[0085] Through the whole process simulation calculation program, calculate the 3-machine 9-node...

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Abstract

The invention provides a method for measuring dynamic voltage stability margin index, while the dynamic voltage stability margin index is the margin to the voltage collapse point of a power system which load increase slowly in a certain speed; the dynamic voltage stability margin index considers that the system is affected by the dynamic components such as the on-load tap changer (ULTC) and the over excitation limit of engines. The method can calculate the dynamic margins of the system which load increases in various types such as single node, regional or full-network type, to provide a visual measurement presenting the distance between the prior operation point of the system and the voltage collapse point, while the distance and the dynamic margin have linear relationship. Therefore, the dynamic margin index has high practical values.

Description

technical field [0001] The invention relates to a method for measuring a dynamic voltage stability margin index, which belongs to the field of simulation and calculation of electric power systems. Background technique [0002] With the progress of voltage stability research, the simulation tools and modeling work are gradually improved. my country's power grid operation and planning departments are very concerned about the simulation research work of medium and long-term voltage stability. The calibration research is listed as an important content of deepening stability calculation. [0003] Margin index is often used to measure system stability. The so-called margin index refers to starting from a given operating state of the system, according to a certain mode, gradually approaching the voltage collapse point through the increase of load or transmission power, from the current operating point of the system to the voltage collapse point. The distance of the points can be us...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R19/00G01R21/00
Inventor 马世英张鑫孙华东张春城孙渝江
Owner CHINA ELECTRIC POWER RES INST
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