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Keywords

power system, transient voltage stability, synchronous generator, parameter optimization, overvoltage

Abstract

Synchronous generators are important reactive power sources in DC receiving-end grids.However，the traditional automatic excitation voltage regulation method，which controls reactive power output solely according to the voltage drop at the generator terminal，fails to fully exploit the reactive power and voltage regulation potential of synchronous generators.To address this issue，a wide-area optimal control framework and method for synchronous generators are proposed to enhance the transient voltage stability of receiving-end grids.First，fault scanning was conducted based on typical operating conditions，and voltage-weak nodes in the receiving-end grid were identified according to the nodal voltage-drop time-area and transient voltage stability margin.Second，the reactive power support capability of each synchronous generator for the voltage-weak nodes was evaluated.For synchronous generators with strong support capability，a remote voltage regulation control unit was added to the excitation system，and the voltage signals of the weak nodes were introduced to form supplementary control.Third，considering the overvoltage constraints of the controlled synchronous generators and nearby renewable energy sources，the key parameters of the remote voltage regulation control units were optimized with the objective of minimizing the voltage-drop time-area of the weak nodes.Finally，simulations were conducted based on data from a simple system and an actual power grid.The results show that the proposed method not only avoids overvoltage but also effectively enhances the transient voltage stability of the power grid.

DOI

10.19781/j.issn.1673-9140.2026.04.003

First Page

25

Last Page

37

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