全球能源互联网2025，Vol.8Issue(6)：702-712,11.DOI:10.19705/j.cnki.issn2096-5125.20250239
基于广义阻抗的新能源柔直送出系统小干扰稳定性评估与提升
Evaluation and Improvement of Small Disturbance Stability for Renewables VSC-HVDC Delivery System Based on Generalized Impedance
摘要
Abstract
Currently,the renewables delivery system with voltage source converter-based high voltage direct current(VSC-HVDC)has become one of the typical forms of new power systems.However,the interaction between renewable converters and the sending-end converter stations of VSC-HVDC is complicated,and system oscillation occurs from time to time.To address this issue,this paper focuses on the sub-synchronous oscillations dominated by the phase-locked loop of renewable converters and proposes a small disturbance stability assessment and enhancement method based on generalized impedance.Firstly,the frequency domain model of the system under the global polar coordinate is established,and an equivalent single-input single-output model is constructed,and a generalized impedance criterion suitable for renewables VSC-HVDC delivery system is derived.Secondly,the impact of phase-locked loop and the outer-loop control parameters of the VSC-HVDC sending-end converter station on the small disturbance stability is analyzed.Finally,a stability enhancement method based on phase correction of the phase-locked loop is proposed and the effectiveness of the proposed method is verified through simulations.This paper provides a reference for assessing and mitigating instability risks and oscillations in renewables VSC-HVDC delivery system.关键词
新能源/柔性直流/广义阻抗/小干扰稳定性/振荡抑制Key words
renewable energy/VSC-HVDC/generalized impedance/small disturbance stability/oscillation suppression分类
信息技术与安全科学引用本文复制引用
朱誉,伍双喜,陆秋瑜,杨银国..基于广义阻抗的新能源柔直送出系统小干扰稳定性评估与提升[J].全球能源互联网,2025,8(6):702-712,11.基金项目
南方电网公司科技项目(036000KK52220018(GDKJXM20220249)).Science and Technology Foundation of China Southern Power Grid Company Limited(036000 KK52220018(GDKJXM20220249)). （036000KK52220018(GDKJXM20220249）
