Electric power system energy function optimization and transient stability margin evaluation system and method

A power system, transient stabilization technology, applied in circuit devices, AC network circuits, reducing/preventing power oscillations, etc., to achieve the effect of improving stability

Inactive Publication Date: 2017-08-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Existing methods discuss the transient stability margin of the power system from different angles. However, how to use the system energy to giv

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  • Electric power system energy function optimization and transient stability margin evaluation system and method
  • Electric power system energy function optimization and transient stability margin evaluation system and method
  • Electric power system energy function optimization and transient stability margin evaluation system and method

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Embodiment Construction

[0052] The invention provides a power system energy function optimization and transient stability margin evaluation method and system. figure 1It is a structural diagram of a power system energy function optimization and transient stability margin evaluation system; it includes sequentially connected data acquisition and processing modules, LMI calculation modules, energy boundary factor calculation modules and control strategy modules;

[0053] The data acquisition and processing module is used to input the system structure parameters after the failure, given the location and type of the accident, and calculates the stable equilibrium point after the failure;

[0054] The LMI calculation module is used to solve the linear matrix inequality of the Lyapunov function of the fault system to obtain a non-negative matrix;

[0055] The energy boundary factor calculation module is used to construct the Lyapunov function of the time-varying power system according to the result of the ...

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Abstract

The invention belongs to the field of electric power system stability analysis and control, and particularly relates to an electric power system energy function optimization and transient stability margin evaluation system and method. The system comprises a data acquisition and processing module, an LMI calculation module, an energy boundary factor calculation module and a control strategy module which are sequentially connected. The method comprises the steps of proposing a Lyapunov function cluster suitable for transient stability analysis in allusion to an electric power system structure preserving model; building three different types of simplified Lyapunov functions and comprehensive characteristics and stability boundary of the three types of functions; considering a network structure and a system state, defining a comprehensive stability index energy boundary factor (EBF) for the Lyapunov function, and applying the comprehensive stability index EBF to online failure severity dynamic sorting and control strategy optimization so as to realize early warning for the safety of an electric power system. According to the invention, evaluation can be performed on the system quickly and effectively, and a reference is provided for system vulnerability quantitative evaluation and online prevention control.

Description

technical field [0001] The invention belongs to the field of power system stability analysis and control, in particular to a power system energy function optimization and transient stability margin evaluation system and method. Background technique [0002] Transient stability analysis is an important part of power system dynamic security assessment. As the power grid structure becomes more and more complex, its operation and control are becoming more and more difficult. How to construct a margin index suitable for transient stability evaluation and quickly and effectively calculate the power system transient stability margin is an urgent research topic. [0003] Among various transient stability online analysis methods, the Lyapunov function method (energy function method) has attracted more attention due to its advantages of quantitatively evaluating the degree of stability, suitable for sensitivity analysis and fast calculation of limit parameters, and has become the most...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 马静康文博沈雅琦张涌新
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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