A Dynamic Top Voltage Control Method for Flexible Excitation System

Abstract

The invention discloses a dynamic top value voltage control method of a flexible excitation system. The technical solution adopted in the present invention is: the synchronous generator starts excitation with no load to the grid connection process, or the inverter demagnetization process after grid connection and decoupling, or the synchronous generator receives the demagnetization switch order under any working condition During the de-excitation process, the intermediate DC voltage of the flexible excitation system is controlled by a conventional two-stage control strategy according to the difference in the machine terminal voltage; The control is carried out respectively in the normal operation interval in which the terminal voltage of the generator is higher than the conventional inflection point voltage, and in the emergency operation interval in which the generator terminal voltage is lower than the conventional inflection point voltage. According to the requirements of different operating conditions of the synchronous generator, the invention dynamically adjusts the intermediate DC voltage to realize the equivalent adjustment of the top value voltage of the excitation system, and improves the forced excitation output capability of the self-shunt excitation system when the system voltage fails and drops, and improves Transient stability of generator sets.

Description

technical field [0001] The invention belongs to the technical field of novel excitation control, in particular to a dynamic peak voltage control method of a flexible excitation system. Background technique [0002] With the widespread application of UHV AC and DC technology, the connection of large-scale new energy units to the grid and the commissioning of large-scale energy storage systems, my country's power grid generally presents two major characteristics of UHV AC-DC hybrid operation and power electronics. As a result, the capacity, structural complexity and geographical span of my country's power grid have increased significantly, leading to a reduction in the stability margin of the power system, and prominent problems of reactive power and voltage stability and broadband oscillation, which are very unfavorable to the safe and stable operation of the power system. [0003] Generator excitation control is recognized as one of the most economical and effective power sy...

AI Technical Summary

Problems solved by technology

But how to make use of this technical feature, on the one hand, to give full play to the high top value multiple excitation voltage output capability of the flexible excitation system when the system requires it, and on the other hand to meet the economical and reliable operation requirements of the normal control function of the excitation system, the existing Research and engineering application have not given both considerations and effective solutions in engineering

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