Phase changing control method and phase changing control device

Abstract

The invention discloses a phase changing control method and a phase changing control device. The method comprises the steps of detecting whether the transient disturbance of a DC power distribution system satisfies a disturbance criterion condition, when the transient disturbance satisfies the disturbance criterion condition, determining the maximum trigger delay angle of a current converter on the inversion side of the DC power distribution system during the phase changing operation, and then controlling the current converter on the inversion side of the DC power distribution system to perform the phase changing operation based on the determined maximum trigger delay angle, wherein the determined maximum trigger delay angle is smaller than the maximum trigger delay angle used before the transient disturbance. According to the phase changing control method, the corresponding maximum trigger delay angle can be determined according to the degree of the transient disturbance of the DC power distribution system, and therefore, the phase changing margin can be guaranteed and the failure in phase changing in case of great transient disturbance can be avoided.

Description

technical field [0001] The invention relates to electric power technology, in particular to a commutation control method and a commutation control device. Background technique [0002] On the inverter side of the DC transmission system, the converter performs commutation processing according to the maximum trigger delay angle. The physical process by which electrical current is transferred from one current path to another. [0003] In the related technology, the DC voltage and DC current of the converter are guaranteed to have a positive slope relationship by using the DC current command value to determine the commutation voltage drop and introducing a positive slope coefficient K. When a small transient disturbance occurs in the DC transmission system, the DC The current command value remains unchanged, and the actual DC current increases due to the disturbance. At this time, if the maximum trigger delay angle determined in the related technology is larger than the maximum...

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Problems solved by technology

[0004] However, when a large transient disturbance occurs in the DC transmission system, the scheme of determining the maximum trigger delay angle provided by the related technology will cause the commutation failure of the converter or even cause the converter to be locked.

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