A droop control converter station control method and device

Abstract

The invention discloses a control method of a droop control converter station. First, whether the droop control converter station is in a full load is judged, if yes, a preset increment is subtractedfrom a droop coefficient, and if the droop control converter station is still in the full load after regulation, preset increments are continuously subtracted from the droop coefficient until the droop control converter station is not in the full load; direct-current voltage of the droop control converter station is calculated, whether the maximum value of the direct-current voltage is larger thanthe maximum limit value of preset direct-current voltage or the minimum value of the direct-current voltage is smaller than the minimum limit value of the preset direct-current voltage is judged, ifyes, a corresponding public voltage reference value when the maximum value of the direct-current voltage is equal to the maximum limit value of the direct-current voltage or the minimum value of the direct-current voltage is equal to the minimum limit value of the direct-current voltage is calculated according to the linear relation between the public voltage reference value and the direct-currentvoltage, and at the moment, all kinds of direct-current voltage will be smaller than or equal to the maximum limit value of the direct-current voltage or larger than or equal to the minimum limit value of the direct-current voltage. The technical problem that an existing droop control method can not overcome the defects that the droop control converter station is in the full load, and the direct-current voltage exceeds limit is solved.

Description

technical field [0001] The invention relates to the control field, in particular to a droop control converter station control method and device. Background technique [0002] Compared with the two-terminal DC system, the multi-terminal DC transmission system (multi-terminal, MTDC) can realize multi-source power transmission, multi-drop flashlight, and provide solutions for large-scale distributed energy grid connection, large-capacity long-distance power transmission and urban interconnection. a reliable technical solution. [0003] The DC voltage stability control and the reasonable distribution of useful power are two core issues for the stable operation of the MTDC transmission system. DC stability control methods can be divided into single-point control and multi-point control, including master-slave control, voltage margin control, droop control and combined control. Since droop control does not rely on high-speed communication between converter stations, multiple con...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a droop control converter station control method and device, which solves the technical problem that the existing droop control method cannot simultaneously solve the droop control converter station full load and DC voltage exceeding the limit

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