UHVDC near zone multi-level grid coordination automatic voltage control method and system

Abstract

The invention discloses a UHVDC near zone multi-level grid coordinated automatic voltage control method and a UHVDC near zone multi-level grid coordinated automatic voltage control system. The UHVDC near zone multi-level grid coordinated automatic voltage control method has the beneficial effects of classifying a UHV converter station, a 500/750 kV transformer substation electrically and closely connected with the UHV converter station, and a power plant connected between the converter station and the transformer substation as reactive power resources in a UHVDC near zone grid overall plan region, performing multi-level grid coordinated automatic voltage control according to a fixed cycle, making overall plans for, coordinating and controlling different types of reactive power resources including a phase modifier and the like in the UHV converter station and belonging to power grids of different levels originally, and making overall plans for, coordinating and controlling different types of reactive power resources belonging to a provincial power grid. The UHVDC near zone multi-level grid coordinated automatic voltage control method and the UHVDC near zone multi-level grid coordinated automatic voltage control system solve the problem that the reactive power resources of the UHV converter station cannot effectively participate in AVC control of the power grid, reduce the complexity of UHVDC near zone multi-level grid coordinated control, and realize the AVC control with various types of coordinated reactive power resources including the phase modifier.

Description

technical field [0001] The present invention relates to the grid automatic voltage control (AVC) technology of the power system, in particular to a UHV DC near-area multi-level grid coordinated automatic voltage control method and system, which is used to address the complexity of the UHV DC near-area grid, considering the country, Sub-level and provincial multi-level power grid coordination and multi-type reactive resource coordination including condensers. Background technique [0002] The Automatic Voltage Control (AVC) system is the main system of voltage and reactive power control in modern power grids. Through the automatic regulation of reactive power resources in the power grid, it can improve the voltage quality of the power grid, reduce network losses, and ensure safe, economical and high-quality operation of the power grid. [0003] my country's existing power grid can be divided into four levels: national, branch, provincial, and local according to dispatch autho...

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Problems solved by technology

For example, the Chinese patent document with the application number of 200710065588.9 discloses a coordinated voltage control method for large regional power grids and provincial power grids. The reactive power resources in the converter station participate in automatic voltage control; for example, the Chinese patent document with the application number 201010232571.X discloses a voltage control method based on the operating status of the UHV grid tie line, which prioritizes meeting the voltage requirements of the UHV AC tie line , does not involve UHV DC transmission, nor does it consider the reactive power resources in the converter station to participate in automatic voltage control; for example, the Chinese patent document with application number 201310439424.3 discloses a coordinated voltage control method for AC-DC hybrid power systems, considering the The AVC control mode of the near-area grid is selected, and the reactive power resources in the UHVDC converter station are not considered to participate in the AVC control, nor are the inside and outside of the converter station under the jurisdiction of the country, branch, or province. Coordinated control methods and methods for reactive resources (such as AC filters, condensers, SVC / SVG, low capacity / low reactance, etc.)

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