Operation voltage optimization method of extra-high voltage direct current transmission system

Abstract

The invention discloses an operating voltage optimization method of an extra-high voltage direct current power transmission system. The method comprises the following steps of establishing an operating voltage optimization model of the extra-high voltage direct current power transmission system, and optimizing the operating voltage of the extra-high voltage direct current power transmission systemon the basis of mathematical relationships between the operating voltage of the extra-high voltage direct current power transmission system and variables such as converter transformer taps, trigger angles and direct currents; and solving the optimal operating voltage of the direct-current power transmission system by using a search method. The invention provides an extra-high voltage direct-current power transmission system operation voltage optimization method which takes reduction of tapping action times of a converter transformer and reserved generator set spinning reserve capacity for keeping transient voltage of a direct-current receiving-end power grid stable as a core, and the tapping action times of the converter transformer of a direct-current system are effectively reduced. Meanwhile, the transient voltage stability level of the direct-current receiving-end power grid is improved, the power supply capacity of the receiving-end power grid in the load peak period is improved,and the engineering application value is good.

Description

technical field [0001] The invention relates to the technical field of operation control of an UHV direct current transmission system, in particular to an operation voltage optimization method of an UHV direct current transmission system. Background technique [0002] With the continuous improvement of the transmission capacity of the UHV DC transmission system, the DC system participates in the peak regulation of the receiving power grid more and more frequently. During the peak and trough periods of daily load, the change of DC transmission power increases continuously, which leads to the increase of tap action times and losses of the converter transformer, and reduces the service life of the equipment. At the same time, the transmission power of the UHVDC transmission system has increased significantly, leading to increasingly serious problems of voltage stability and insufficient dynamic reactive power support of the DC receiving end grid. In order to maintain the trans...

AI Technical Summary

Problems solved by technology

However, in the existing technology, there is no cost-effective way to reduce the number of tap operations of the converter transformer and improve the transient voltage stability of the receiving end power grid.

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