HVDC (high voltage direct current transmission) system wide area distributed and cooperative control method based on convex polyhedron theory

A technology of convex polyhedron theory and decentralized coordinated control, applied in the field of control, can solve problems such as the inability to guarantee the robustness of the system and the inability to meet operating requirements

Inactive Publication Date: 2015-06-10
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The controller obtained in this way is only valid for this equilibrium point, and cannot meet the operating requirements under other operating conditions, that is, the robustness of the system cannot be guaranteed

Method used

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  • HVDC (high voltage direct current transmission) system wide area distributed and cooperative control method based on convex polyhedron theory
  • HVDC (high voltage direct current transmission) system wide area distributed and cooperative control method based on convex polyhedron theory
  • HVDC (high voltage direct current transmission) system wide area distributed and cooperative control method based on convex polyhedron theory

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Embodiment

[0133] Such as image 3 The two-zone four-machine HVDC system model shown is equipped with a DC additional controller and an SVC. SVC is installed at node 7 to increase the voltage of this node, and a DC additional controller is installed on one end busbar of the inter-regional DC connection line to maintain power stability and suppress inter-regional oscillations. Set damping ratio threshold ζ 0 = 0.1.

[0134] First, the Hankel method is used to reduce the system to a 7th-order model. Then, based on the obtained reduced-order system, the proposed algorithm is used to design a dynamic output feedback controller, and at the same time coordinate the SVC, DC additional controller and generator. According to the decentralized coordinated control method, the obtained wide-area decentralized coordinated controller can ensure that the minimum damping ratio of the system satisfies ζ min ≥10%, that is, the closed-loop dynamic linear output feedback control system operates in strong...

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Abstract

The invention provides an HVDC (high voltage direct current transmission) system wide area distributed and cooperative control method based on a convex polyhedron theory. The HVDC system wide area distributed and cooperative control method based on the convex polyhedron theory includes following steps: building an HVDC system model, and performing linear treatment on the HVDC system model; using a wide area distributed and cooperative controller to control the HVDC system model; confirming satisfaction conditions of stable running of a closed dynamitic linear output feedback control system; designing a wide area distributed and cooperative controller based on the convex polyhedron theory. The HVDC system wide area distributed and cooperative control method based on the convex polyhedron theory has the advantages of being clear in mathematical and physical concept, high in calculation speed, strong in adaptability and the like, not only is suitable for wide area damping coordinated control of an HVDC system, but also can be used in design of multiple FACTS coordination controllers and coordination control of other damping controllers, and has a wide application prospect.

Description

technical field [0001] The invention relates to a control method, in particular to a wide-area decentralized coordinated control method for an HVDC system based on a convex polyhedron theory. Background technique [0002] With the continuous increase of large-capacity and long-distance power transmission projects in my country, the problem of dynamic stability, one of the important factors affecting the stability of power transmission across large regions, has become increasingly prominent. The feedback control link of the existing power system stabilizer (PSS) is usually composed of local measurements. In addition, the PSS often adopts a decentralized design, lacks mutual coordination, and cannot suppress the inter-regional oscillation mode well. [0003] Due to the economy of HVDC transmission technology and its unique fast response characteristics, HVDC transmission technology can be used as a means of damping low-frequency oscillations for large-scale grid interconnectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/36
Inventor 徐式蕴易俊赵兵卜广全吴萍杨钊
Owner STATE GRID CORP OF CHINA
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