对偶视角下基于特征子系统的跟网/构网互联系统强度评估  

System Strength Evaluation of Grid-following and Grid-forming Interconnected System Based on Eigen-subsystem from Dual Perspective

作　　者：冷若寒 殷波 胡光 陈航宇 丛聪 庄可好 辛焕海[1] LENG Ruohan;YIN Bo;HU Guang;CHEN Hangyu;CONG Cong;ZHUANG Kehao;XIN Huanhai(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;China Datang Technology Innovation Co.,Ltd.,Baoding 070001,China)

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]中国大唐集团科技创新有限公司,河北省保定市070001

出　　处：《电力系统自动化》2025年第7期103-114,共12页Automation of Electric Power Systems

基　　金：中国大唐集团科技创新有限公司资助项目(DTKC-2024-20604)。

摘　　要：跟网、构网互联系统中各类设备交互作用明显,如何准确量化互联系统强度面临挑战。为此,首先从对偶视角探讨了跟网、构网系统闭环稳定性与开环网络灵敏度的匹配关系,并基于此引入了反映电流刚性的电网强度指标。然后,解析得到了与高维互联系统稳定性等价的低维跟网、构网特征子系统,并基于此提出了互联电力系统强度二维指标。该指标同时反映跟网、构网特征子系统的稳定裕度,从而实现了互联系统多频段小扰动稳定性的有效评估。结合该指标,得出了电力系统适度互联形态有利于同时降低跟网、构网失稳风险的推论。最后,仿真验证了所提方法的有效性及推论的正确性。The significant interactions between devices in grid-following and grid-forming interconnected systems present challenges in accurately quantifying system strength.To address this,firstly,the matching relationship between the closed-loop stability of grid-following and grid-forming systems and the open-loop network sensitivity from a dual perspective is discussed.Based on this,a power grid strength index reflecting current strength is introduced.Furthermore,the low-dimensional gridfollowing and grid-forming eigen-subsystems equivalent to the stability of the high-dimensional interconnected system are analytically obtained.Based on this,a two-dimensional index of the strength of the interconnected power system is proposed.This index can reflects the stability margins of both the grid-following and grid-forming eigen-subsystems simultaneously,thus enabling the effective assessment of the multi-frequency-band small-disturbance stability of the interconnected system.Combined with this index,the inference is drawn that an appropriate interconnected form of the power system is conducive to instability risk reduction of an both the grid-following and grid-forming systems simultaneously.Finally,simulations verify the effectiveness of the proposed method and the correctness of the inference.

关 键 词：互联系统 电网强度 特征子系统 系统强度 跟网 构网 

分 类 号：TM712[电气工程—电力系统及自动化]