An adaptive hvdc emergency power support method

A power support and self-adaptive technology, applied in the direction of power transmission AC network, circuit device, AC network circuit, etc., can solve the problem of no calculation method and can not be fully self-adaptive to achieve dynamic optimal power support and other problems

CN107294127BActive Publication Date: 2019-07-05ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-07-05

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Abstract

The invention provides a HVDC adaptive emergency power support method based on real-time estimation of unbalanced power in an AC-DC interconnected electric power system region in order to solve the problem of power angle oscillation of a generator in the fault or disturbance condition of an AC-DC interconnected electric power system. The method includes: establishing an extended state observer of unbalanced power in the region in the system disturbance, and setting parameters of the observer to realize real-time and accurate estimation of the unbalanced power; analyzing direct current emergency power support restriction factors, optimizing an emergency power support amount, and forming the final power support amount; and finally achieving the goal of power support based on a power support stepped increasing principle. According to the method, compared with a conventional fixed-value emergency power support method, the unbalanced power of the system can be estimated in real time so that the power support amount is adjusted in real time, and the goal of dynamic and optimal power support can be achieved.
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Description

technical field

[0001] The invention relates to the technical field of high voltage direct current transmission additional transient control, in particular to an adaptive HVDC emergency power support method. Background technique

[0002] The national network pattern of west-east power transmission and north-south mutual supply has been initially formed. The large-scale interconnection of the power grid will cause the local disturbance of the power grid to spread to the adjacent large areas soon. At present, regional power grid interconnection with high-voltage direct current is the main form of power grid development in recent years. Due to the rapid adjustment characteristics and overload capacity of direct current, it is possible to perform additional control on direct current, suppress power grid disturbances, and improve the safety and stability of the interconnected power grid. A large number of experts and scholars at home and abroad have conducted extensive research ...

Examples

Embodiment Construction

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0066] When studying the transient stability of power systems under fault conditions, the system is often equivalent to a dual-machine instability mode. That is to say, the system is divided into the critical group S and the remaining group A, so the problem of angular stability of the system becomes the relative swing problem of the critical group S to the remaining group A. The transient motion equations of the critical group S and the remaining group A are:...