1.上海电力大学 电气工程学院,上海 200090
2.浙江大学 电气工程学院,浙江 杭州 310027
金伟涛(2000 —),男,硕士研究生,主要研究方向为新型电力系统平衡点存在性的分析、评估及控制(E-mail:1648167398@qq.com);
娄云天(1997 —),男,博士研究生,主要研究方向为新型电力系统平衡点存在性的分析、评估及控制(E-mail:eelyt@zju.edu.cn);
汤 波(1984 —),男,高级工程师,博士,通信作者,主要研究方向为新型配电网规划与优化运行、电力系统数据分析等(E-mail:tangbo@shiep.edu.cn)。
收稿:2025-01-17,
修回:2025-06-25,
网络首发:2025-11-19,
纸质出版:2026-03-10
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金伟涛,娄云天,汤波等.低电压穿越期间新能源并网系统静态失稳机理及改进控制方法[J].电力自动化设备,2026,46(03):196-204.
JIN Weitao,LOU Yuntian,TANG Bo,et al.Static instability mechanism and improved control method of renewable energy grid-connected system during low-voltage ride through[J].Electric Power Automation Equipment,2026,46(03):196-204.
金伟涛,娄云天,汤波等.低电压穿越期间新能源并网系统静态失稳机理及改进控制方法[J].电力自动化设备,2026,46(03):196-204. DOI: 10.16081/j.epae.202511013.
JIN Weitao,LOU Yuntian,TANG Bo,et al.Static instability mechanism and improved control method of renewable energy grid-connected system during low-voltage ride through[J].Electric Power Automation Equipment,2026,46(03):196-204. DOI: 10.16081/j.epae.202511013.
低电压穿越期间新能源的电流控制特性不合理将导致并网系统发生静态失稳。为此,基于新能源并网系统的静态等值数学模型,揭示了新能源低电压穿越控制期间导致并网系统失稳的分岔类型,分析了电网强度及新能源电流控制参数对分岔形态演化的作用规律;根据控制环节的动态特性,明确了低电压穿越期间并网系统的失稳形态,并提出了有效防止系统失稳的新能源有功电流改进控制方法。时域仿真结果验证了所提控制方法保持低电压穿越期间并网系统稳定运行的有效性。
Unreasonable current control characteristics of renewable energy during low-voltage ride through will lead to static instability in the grid-connected system. Therefore,based on the static equivalent mathematical model of renewable energy grid-connected system,the bifurcation types that cause instability of grid-connected system during low-voltage ride through control of renewable energy are revealed,and the influence laws of grid strength and renewable energy current control parameters on the evolution of bifurcation morpho-logy are analyzed. Based on the dynamic characteristics of the control link,the instability forms of renewable energy grid-connected system during low-voltage ride through are clarified,and an improved active current control method of renewable energy is proposed to effectively prevent system instability. The time-domain simulation results verify the effectiveness of the proposed control method in maintaining the stable operation of the grid-connected system during low-voltage ride through period.
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