Static Voltage Stability Margin Analysis and System Fault Sorting Method of Power System

Abstract

The invention provides a static voltage stability margin analyzing and system fault ordering method of a power system. The static voltage stability margin analyzing and system fault ordering method includes the following steps that the Newton iteration method based on the optimal multiplier is used for determining a static voltage collapse point; according to the characteristic of iteration convergence, the type of the voltage collapse point is judged; according to the requirement for stability margin, system fault danger conditions are checked and ordering of stability faults is performed; the faults are parameterized and the iteration method is used for giving out the order of seriousness degrees of instability faults. According to the static voltage stability margin analyzing and system fault ordering method of the power system, voltage stability margins of the power system can be rapidly given online, real-time effective monitoring is carried out on the voltage stability and the comprehensive order of the stability faults and the instability faults can be used for guiding a power generator to adjust online and switching reactive power compensation devices when the system encounters faults, can also guide sub-circuit parameter adjusting, line increasing and decreasing, configuration of an FACTS device and the like off line and have great significance in operation and planning of the power system.

Description

technical field [0001] The invention relates to the technical field of power system monitoring, analysis and control, in particular to a static voltage stability margin analysis and system fault sorting method of a power system. Background technique [0002] The research on the voltage stability of the power system started later than the research on the frequency stability. It started in the 1940s. It was not until the 1970s that the voltage stability problem began to receive attention as a specialized field. With the modern power system The development of the power transmission field may lag behind the growth of system load and power generation level. The power network often operates at a high load level and faces a critical limit of voltage stability, which leads to a series of major voltage stability accidents. [0003] There are many analysis methods for the static voltage stability problem. Using the system PV curve to give the voltage stability margin of the load node...

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Problems solved by technology

[0008] Chinese invention patent (application number 201110368041.2) is a method for evaluating the severity of power system faults. According to the simulation process information, it is judged whether the power angle, voltage, and frequency instability have occurred in the system; The severity coefficient of the fault, the comprehensive severity coefficient is obtained by weighting the three severity coefficients obtained above. The basis of the sorting is the fault result, which is to sort the impact of the fault on the system. The difficulty of solving the fault is not discussed, and the operation scheduling method for solving the fault cannot be given.

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