“双高”电力系统非经典稳定性分析  

Non-classical Stability Analysis of Power System With High Shares of Renewables and Power Electronics

作　　者：孙秋野[1] 隋政麒 王睿[1] 沈千翔 李大双 姚葭 孙城皓 SUN Qiuye;SUI Zhengqi;WANG Rui;SHEN Qianxiang;LI Dashuang;YAO Jia;SUN Chenghao(School of Information Science and Engineering,Northeastern University,Shenyang 110819,Liaoning Province,China)

机构地区：[1]东北大学信息科学与工程学院,辽宁省沈阳市110819

出　　处：《中国电机工程学报》2023年第S1期1-13,共13页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家重点研发计划项目(2018YFA0702200)

摘　　要：高比例可再生能源和高比例电力电子设备(即“双高”)并网有力推动了“双碳”战略发展,但同时也产生了低频及次/超同步宽频振荡等新的稳定问题。虽然国内外已有众多针对此类非经典稳定性问题的分析方法,但仍缺少对其失稳本质的探索。为此,该文提出一种阻抗角稳定性分析方法,试图从本质上解释“双高”系统产生非经典稳定问题的原因。首先,该文通过实际测试系统首次发现逆变器等效阻抗幅值会随系统电流增大而增大,而相位基本保持不变这一现象;其次,提出阻抗角稳定性分析方法,分析“双高”系统失稳的本质原因,并进一步得到阻抗角稳定判别区间。研究表明,“双高”电力系统的宽频振荡问题是由于系统无功功率受到扰动,导致阻抗角发生变化,使得无功功率无法恢复到原始平衡点所引发的。此外,该文基于所提出的阻抗角稳定性分析方法,提出了新的电力系统稳定性分类方式。最后,通过仿真验证了阻抗角稳定性分析方法的正确性。The high penetration of renewable energy sources and a high proportion of power electronic devices(“double-high”)connected to the grid have effectively promoted the development of the“carbon peaking and carbon neutrality”strategy.However,this has also led to the emergence of broadband oscillation issues such as low-frequency or sub/super-synchronous oscillations.Although numerous analytical methods have been proposed both domestically and internationally to address these non-classical stability issues,there is still a lack of exploration into their fundamental causes.Therefore,this paper proposes an impedance angle stability analysis method,aiming to fundamentally explain the reasons behind the occurrence of non-classical stability issues in“double high”systems.Firstly,through actual testing of the system,this paper identifies for the first time that the equivalent impedance magnitude of inverters increases with the system current,while the phase remains essentially unchanged.Secondly,it introduces the impedance angle stability analysis method,analyzing the fundamental causes of instability in“double-high”system and further defining the impedance angle stability discrimination interval.The research shows that the broadband oscillation problem in“double-high”power systems is caused by disturbances affecting the system's reactive power,leading to changes in impedance angles and preventing the reactive power from returning to its original equilibrium point.Furthermore,based on the proposed impedance angle stability analysis method,the paper introduces a new classification for power system stability.Finally,the correctness of impedance angle stability analysis method is validated through simulation.

关 键 词：“双高”电力系统 非经典稳定性 宽频振荡 阻抗角稳定性 稳定性分类 

分 类 号：TM712[电气工程—电力系统及自动化]