Power frequency electrical parameter extraction method and system and computer readable storage medium

Abstract

The invention discloses a power frequency electrical parameter extraction method and system and a computer readable storage medium. The power frequency electrical parameter extraction method comprisesthe following steps of acquiring phase information of a three-phase voltage signal, a three-phase current signal and a three-phase voltage on a natural coordinate system of an ultrahigh-voltage DC inversion end AC line at commutation failure moment; converting the three-phase voltage signal and the three-phase current signal on the natural coordinate system to a dq0 coordinate system by a synchronous rotation coordination change method so as to obtain a voltage component and a current component corresponding to each phase on a d axis and a q axis; and obtaining a DC component corresponding toeach phase on the d axis and the q axis, and calculating an apparent power, an active power and a reactive power corresponding to each phase according to the DC component corresponding to each phaseon the d axis and the q axis. By the method, a power frequency component is conveniently and rapidly extracted when commutation is in failure.

Description

technical field [0001] The invention belongs to the technical field of power grid data processing, and in particular relates to a method, a system and a computer-readable storage medium for extracting power frequency parameters suitable for UHV DC commutation failures. Background technique [0002] The distance between my country's large-scale energy base and the load center in the eastern and central regions reaches 1000-3000km, exceeding the economic transmission distance of traditional ultra-high voltage transmission lines. Therefore, my country is vigorously developing UHV AC-DC hybrid power grids suitable for long-distance and large-capacity power transmission. However, with the rapid development of UHV AC and DC, especially the rapid growth of UHV DC transmission scale, the operating characteristics of the power grid have undergone profound changes. On the one hand, the contradiction of "strong DC and weak AC" is prominent. Common disturbances or routine operations su...

AI Technical Summary

Problems solved by technology

On the one hand, the contradiction of "strong DC and weak AC" is prominent. Common disturbances or routine operations such as AC line faults, reclosing, and empty charging of the main transformer may cause DC commutation failures in the vicinity, causing cascading failures in the AC and DC systems, resulting in huge transients energy shock

[0003] At the same time, the interaction characteristics of the AC-DC hybrid grid are obvious, and the dynamic response process of the DC control system during the fault period is discrete and nonlinear, which will further increase the complexity and variability of the fault transient process, thus presenting a simple fault The trend of globalization has a serious impact on the correct action of traditional power system relay protection devices and safety and stability control devices

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