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A DC voltage hybrid control strategy for a multi-terminal flexible HVDC transmission system

A technology of direct current transmission system and direct current voltage, which is applied in the direction of direct current network circuit device, alternating current network voltage adjustment, electrical components, etc., and can solve problems such as deviation

Active Publication Date: 2018-05-04
XUJI GRP +2
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to provide a DC voltage hybrid control strategy for a multi-terminal flexible DC transmission system to solve the defects in the prior art of using DC voltage deviation control or DC voltage slope control alone

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  • A DC voltage hybrid control strategy for a multi-terminal flexible HVDC transmission system
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  • A DC voltage hybrid control strategy for a multi-terminal flexible HVDC transmission system

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] Most of the multi-terminal flexible DC transmission systems adopt a parallel connection mode with wide adjustment range, flexible expansion, easy control and high reliability. Therefore, the control strategy of the present invention is also mainly aimed at parallel multi-terminal systems. System block diagram as figure 1 As shown, the control system is generally divided into four layers: system level control, converter level control, converter valve level control and sub-module level control. The DC voltage hybrid control strategy of the present invention belongs to system-level control, and is used to generate active power instructions for regulating DC voltage, regardless of the topology of the converter.

[0040] In the existing method, the classical second-order voltage deviation control principle and controller are shown in FIG. 2 . The second-o...

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Abstract

The present invention relates to a DC voltage hybrid control strategy for a multi-terminal flexible direct current transmission system. For a multi-terminal flexible direct current transmission system, at least one converter station adopts hybrid control: that is, a combination of three control modes is adopted, and the three control modes are : Constant power control, constant DC voltage control and DC voltage droop control; the combination of the above three control modes is realized by mixing constant DC voltage control, DC voltage slope control and DC voltage deviation control. The invention can better suppress the DC voltage fluctuation degree when the voltage deviation method is used to control mode switching, and overcomes the problem that the active power flow cannot be accurately controlled by the DC voltage slope control, and can also use the inter-substation and intra-substation hybrid control schemes of multiple converter stations The configuration achieves the purpose of smooth DC voltage takeover.

Description

technical field [0001] The invention relates to the fields of flexible power transmission and distribution of power systems and power electronics, in particular to a DC voltage hybrid control strategy for a multi-terminal flexible DC transmission system. Background technique [0002] The flexible HVDC transmission technology based on the voltage source converter has independent control of active and reactive power decoupling, can be connected to weak grids, supply power to passive loads, has grid black-start capability, fast dynamic response, excellent harmonic characteristics and occupies With many advantages such as small land area, it has been more and more widely used in large-scale intermittent new energy grid connection, island passive load power supply, AC grid interconnection, and urban intelligent power supply and distribution. [0003] The characteristics of multiple power supply and receiving points in the multi-terminal system can give full play to the technical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/12H02J1/00
CPCY02E60/60
Inventor 吴金龙张浩王先为刘欣和杨美娟
Owner XUJI GRP
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