受端近区光伏电站对LCC-HVDC系统稳定性影响分析
Stability Analysis of LCC-HVDC with PV Station at the Receiving End
周于清 1李大虎 2姚伟 1宗启航 1周泓宇 1文劲宇1
作者信息
- 1. 强电磁技术全国重点实验室(华中科技大学电气与电子工程学院),湖北武汉 430074
- 2. 国网湖北省电力有限公司,湖北武汉 430077
- 折叠
摘要
中国湖北等地已形成高比例新能源和直流共同馈入的新型受端电力系统,光伏电站馈入直流受端换流站近区时,电力电子设备次同步振荡特性及子系统间交互作用有待分析.采用特征值分析法,对大规模光伏电站馈入对直流系统稳定性影响展开研究.首先,建立了大规模光伏电站直流受端并网系统小信号分析模型,从模态角度证实光伏电站馈入对直流系统稳定性存在较大影响.进一步,通过主导模态观察各子系统间的交互作用特性,以减小系统次同步振荡风险为目标,整定光伏控制参数可行域.最后,定义子系统参与度,衡量运行参数对系统间次同步交互作用的影响,得出受端电网强度较小、光照强度较大时,光伏电站与直流系统间交互作用更强的结论,同时在设计光伏电站并网时应选取阻抗比小的导线,减小光伏并网线路距离.研究结论可为光伏并网设计提供理论依据.
Abstract
A new type of receiving-end power system with high proportion of new energy and HVDC has been formed in Hubei.In the scenario where the PV station is located near the HVDC receiving-end converter station,the sub-synchronous oscillation characteristics of power electronic devices and the interactions between the sub-systems are still to be analyzed.This paper used eigenvalue analysis method to explore the influence of the massive infeed of PV stations.Firstly,with a small signal analysis model of HVDC with PV station established,this paper has confirmed that the infeed of PV stations has a significant influence on the system stability.The interaction characteristics between subsystems were further observed through the dominant mode,and the feasible region of photovoltaic control parameters set,with a view to lower risks of sub-synchronous oscillation in the system.Finally,this paper defined the subsystem participation degree and measured the influence of operational parameters on the sub-synchronous interaction between the systems.It is concluded that the interaction between the PV plant and the DC system is stronger in the case of low grid strength and high light intensity at the receiving end.When designing a PV plant for grid connection,a conductor with a small impedance ratio should be selected to reduce the distance of the PV grid connection line.This conclusion can provide a theoretical basis for photovoltaic grid-connected design.
关键词
直流输电/光伏电站/次同步振荡/交互作用/特征值分析Key words
LCC-HVDC/PV station/sub-synchronous oscillation/interaction/eigenvalue analysis引用本文复制引用
基金项目
国家自然科学基金优秀青年科学基金(52022035)
国家电网湖北省电力公司科技项目(52150521000W)
出版年
2024
国家科技期刊平台
NSTL
万方数据