A method and device for analyzing transient stability performance of an AC-DC hybrid power system

Abstract

The invention discloses a method and a device for analyzing the transient stability performance of an AC / DC hybrid power system. The method includes calculating the critical fault clearance angle and limit clearance time of a pure AC system; establishing a generalized mathematical model of the steady-state power flow of the AC / DC hybrid system; And based on the generalized mathematical model, the steady-state transmission power of the AC-DC hybrid system before the transient fault and the maximum transmission power of the AC-DC hybrid system after the transient fault are obtained; the critical cutoff angle of the AC-DC hybrid system after the transient fault is calculated. and the critical cut-off time of the AC-DC hybrid system after the transient fault; according to the critical cut-off angle and the critical cut-off time of the AC-DC hybrid system after the transient fault, the transient stability of the AC-DC hybrid power system is judged. The transient stability of AC-DC transmission system can be comprehensively analyzed, and the mathematical model established can be numerically analyzed, and the quantitative evaluation index of transient stability characteristics and performance of AC-DC hybrid power system can be given.

Description

technical field [0001] The invention belongs to the technical field of power system analysis, and in particular relates to a method and device for analyzing the transient stability performance of an AC / DC hybrid power system. Background technique [0002] The existing researches on the stability analysis of AC and DC transmission systems are all based on numerical methods, but no work based on analytical methods. For example, the numerical analysis for judging stability based on the initial state energy and the critical energy of the system can give an approximate solution of transient stability assessment, but the physical meaning is unclear, which is not conducive to guiding the controller to take stability improvement measures, and the calculation time is long. , which affects the protection setting and control efficiency. In order to comprehensively study the behavior of an AC-DC hybrid transmission system, an appropriate mathematical model needs to be established. In a...

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Problems solved by technology

For example, the numerical analysis of judging stability based on the initial state energy and system critical energy can give an approximate solution for transient stability evaluation, but the physical meaning is unclear, which is not conducive to guiding the controller to take stability improvement measures, and the calculation time is relatively long , affecting protection setting and control efficiency, in order to comprehensively study the behavior of an AC / DC hybrid transmission system, it is necessary to establish a suitable mathematical model

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