High-voltage DC synchronous condenser start-up grid-connected control system and its control method

Abstract

The invention discloses a starting grid-connected control system and control method of a high-voltage DC synchronous phase modifier. The system comprises a starting control system, a grid-connected control system, a master control selector, an output control system and a high-voltage DC synchronous phase modifier main circuit, wherein the starting control system is used for outputting a starting voltage reference value of the synchronous phase modifier according to a starting initial voltage of the synchronous phase modifier, the grid-connected control system is used for outputting a power grid voltage control compensation value according to a power grid voltage reference value and a measurement value, the mater control selector is used for selecting the starting control system or the grid-connected control system as an input of the output control system according to a running state of the synchronous phase modifier main circuit, and the output control system is used for determining the input of the high-voltage DC synchronous phase modifier main circuit according to an output of the starting control system or the grid-connected control system so as to achieve starting and grid connection of the synchronous phase modifier. By the system, an impact current and an excitation surge current which are generated by the starting process of the synchronous phase modifier are reduced, and smooth starting and grid connection of the synchronous phase modifier are achieved.

Description

technical field

[0001] The invention belongs to the start-up grid-connection control technology of high-voltage direct current synchronous condensers, in particular to a high-voltage direct current synchronous condenser start-up grid-connection control system and a control method based on sequence control. Background technique

[0002] As a special synchronous motor, the synchronous condenser can not only provide reactive power compensation to the grid, but also absorb the excess reactive power of the grid, and has high application value in the fields of high-voltage direct current and ultra-high voltage direct current transmission. The synchronous condenser is a rotary dynamic reactive power compensation device. Large excitation inrush current and surge voltage are likely to occur during the grid connection process. If the grid connection control method is not appropriate, it will cause shocks at the grid connection point and the grid. Therefore, it is meaningful to design ...

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