Layered access direct current commutation failure prevention and control setting method and device

Abstract

The invention provides a layered access direct current commutation failure prevention and control setting method and device. The method comprises the following steps: constructing an electromechanicaland electromagnetic hybrid simulation example, the example comprising acquired electromechanical side data of layered access of ultrahigh voltage direct current and a built electromagnetic side modelof the layered access of the ultrahigh voltage direct current; setting a fault, and finding out a fault form that causes a commutation failure of a converter valve on a non-faulty layer; analyzing factors affecting a turn-off angle in a commutation failure prevention and control logic, and selecting parameters suitable for the commutation failure prevention and control of a layered access system;and forming a commutation failure prevention and control strategy according to the parameters for the commutation failure prevention and control. The layered access direct current commutation failureprevention and control setting method provided by the invention adopts an electromechanical-electromagnetic hybrid simulation measure, and a direct current system is built on the electromagnetic side, so that a detailed structure of layered direct current is considered, and the defect that a traditional electromechanical model simulation method cannot accurately simulate a commutation failure process is overcome.

Description

technical field [0001] The invention relates to a method in the field of simulation and calculation of an electric power system, in particular to a method and device for preventing and controlling the commutation failure of layered access DC. Background technique [0002] UHV layered access (1000kV and 500kV AC power grid) has obvious advantages in improving the voltage support capability of the receiving end system and guiding the reasonable distribution of power flow. At present, the commutation failure prevention and control strategy of the UHVDC transmission system has played a good role in preventing the commutation failure from happening again on the inverter side during the voltage recovery process after the fault. However, when a fault on a single level of the DC receiving end causes a small drop in the AC voltage on the other level, the current commutation failure prevention and control strategy often cannot prevent the other level from commutation failure, and even...

AI Technical Summary

Problems solved by technology

[0022] Although there are various types of conventional DC commutation failure prevention and control analysis, there are few studies on the determination method of commutation failure prevention and control parameters for DC layered access

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