Direct-current converter station and control method and system thereof

A technology of a DC converter station and a control method, which is applied in the field of a DC converter station and its control method and control system, can solve problems such as fault phenomena and less ride-through control, and achieve the effect of stabilizing the DC bus voltage
CN110994663AActive Publication Date: 2020-04-10HEFEI UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI UNIV OF TECH
Publication Date
2020-04-10

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Abstract

The invention provides a direct-current converter station and a control method and system thereof. The control method of the direct-current converter station comprises: controlling a receiving end converter station by adopting an active-reactive control method; adding an input power regulation module at the input end of an active-reactive power control power loop, and connecting the input power regulation module with an active-reactive power control power loop; and adjusting, by the input power adjusting module, an input power instruction of active-reactive control according to the voltage ofthe receiving end power grid and the voltage of the receiving end direct-current bus. By utilizing the method, reactive power can be continuously provided for the power grid when the voltage of the receiving-end power grid drops, an over-current phenomenon does not occur in the converter station, the system can stably operate after fault recovery, the direct-current bus voltage can be stabilized when the voltage of the sending-end power grid drops, and the system can stably operate after fault recovery.
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Description

technical field

[0001] The invention relates to the technical field of electric power transmission and distribution, in particular to a DC converter station and its control method and control system. Background technique

[0002] With the continuous adjustment of my country's energy structure, flexible direct current transmission (HVDC), as a new type of power transmission method, is suitable for medium and long-distance transmission, especially in the The long-distance transmission of renewable energy and the interconnection of power grids have been widely used.

[0003] Low-voltage ride-through (LVRT) capability means that when a voltage drop occurs at the grid-connected point, the grid-connected converter system can maintain the grid-connected state, and the system can resume normal operation after the power grid recovers. The low-voltage ride-through capability has been used as the grid-connected system at present. An important indicator has received extensive attention ...

Claims

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