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Voltage-gradient-based steepest voltage collapse margin calculation method

A voltage collapse and calculation method technology, applied in the field of power system, can solve problems such as difficulty in making correct judgments, system voltage collapse, adverse social impact and economic loss

Active Publication Date: 2012-06-27
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

It is difficult for operators to accurately judge the degree of current system voltage stability, so it is difficult to make correct judgments and corresponding countermeasures, which may lead to system voltage collapse and bring adverse social impact and economic losses

Method used

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  • Voltage-gradient-based steepest voltage collapse margin calculation method
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  • Voltage-gradient-based steepest voltage collapse margin calculation method

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Embodiment Construction

[0040] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] The invention provides a method for calculating the fastest voltage collapse margin based on voltage gradient, figure 1 is a flow chart of the fastest voltage collapse margin algorithm based on voltage gradients of the present invention, the method includes the following steps:

[0042] Step A: Based on the time-domain simulation method, obtain the Thevenin equivalent parameters of the system at the load bus to be monitored in the post-fault system;

[0043] Step B: The direction of the negative gradient of the load bus voltage is the direction in which the voltage of the load drops the fastest, that is, the most dangerous direction of load growth;

[0044] Step C: Taking the transmission power of the system as the objective function, taking the negative gradient direction of the bus voltage as the constraint condition, and...

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Abstract

The invention discloses a voltage-gradient-based steepest voltage collapse margin calculation method. According to the method, a Thevenin equivalent parameter corresponding to a system at a monitored load bus of the system with a failure is calculated, the negative gradient direction of bus voltage after the system fails is taken as a constraint condition, load power is taken as an objective function, a modified objective function is constructed by a Lagrange factor method, an extreme point is calculated, and the steepest voltage collapse margin of the load bus is further obtained. The method is applied to the offline and online stability analysis and operation control of a power system, and is favorable for line staff and analysts of the system to identify the condition of the system with the failure and to take effective safety control measures, so that the stable operating level of the power system is improved.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a calculation method for the fastest voltage collapse margin based on voltage gradients. Background technique [0002] With the development of society and economy, the load increases rapidly, but the internal main power plant of the receiving system is insufficient, and the dependence on external power is getting higher and higher. In addition, the power grid structure is relatively weak, the system often operates under medium load conditions and due to the use of new electrical equipment, the proportion of load that is not conducive to voltage stability is increasing. These factors increase the risk of voltage instability in the receiving system and even lead to blackouts. [0003] The minimum voltage stability margin is to analyze the voltage stability of the system by obtaining the stability margin of the current point in the worst variation mode of the system. Altho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 汤涌林伟芳孙华东吴萍
Owner CHINA ELECTRIC POWER RES INST
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