包含串补的并网直驱风电场振荡稳定性及可行域分析  

Analysis of Oscillation Stability and Feasible Region of Parameters in Grid-Connected Direct-Drive Wind Farm with Series Compensation

作　　者：季一宁 王海风 Ji Yining;Wang Haifeng(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Resources North China Electric Power University,Beijing 102206,China;College of Electrical Engineering Sichuan University,Chengdu 610064,China)

机构地区：[1]新能源电力系统全国重点实验室(华北电力大学),北京102206 [2]四川大学电气工程学院,成都610064

出　　处：《电工技术学报》2024年第3期686-698,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52077144)。

摘　　要：串补装置广泛存在于电力系统中,含串补的大规模直驱永磁同步发电机(PMSG)构成的风电场并网系统存在次同步振荡范畴的小干扰失稳风险。针对上述现象,该文首先构建包含PMSG网侧换流器控制模型、锁相环控制模型以及含有串补装置的线路动态模型的并网系统全阶模型及等效模型。然后在不同的时间尺度下对等效模型进行化简,运用劳斯-赫尔维茨判据求得各时间尺度场景下并网系统的稳定性判据,从机理上解释了并网系统中各运行参数和控制参数之间的联系及其对系统稳定性的影响。进一步通过一个包含15台PMSG风电机组的并网风电场验证了该文推导的稳定判据的正确性。最后基于可行域的分析,直观地讨论了串补线路和其他参数对系统稳定性的影响。Series compensation devices are widely used in power systems.The wind farms grid-connected system composed of large-scale direct permanent magnet synchronous generator with series compensation has the risk of small interference instability in the sub-synchronous oscillation category.Most of the existing literatures are aimed at doubly-fed wind farms.There are few studies on the PMSGs grid-connected wind farm system through series compensation lines,and most of them are based on simulation analysis,lacking in-depth research on the mechanism and analysis of the relationship between various parameters.At the same time,the stability analysis methods of wind farm grid-connected system generally include impedance analysis and mode analysis.However,the system impedance obtained by impedance analysis method is a sufficient but not necessary condition for system stability,which leads to its limitations.Mode analysis method needs to establish a refined model of electromagnetic transient level of power system.When the model scale is too large,there are some problems such as difficult calculation and longtime consumption.Aiming at the research of the above literatures and existing problems,this paper puts forward a simplified model method and corresponding stability criterion based on different time scales for the stability analysis of PMSG grid-connected wind farm with series compensation lines.Firstly,a full-order model of the system for small signal analysis is established,which can be used to clarify the dominant mode of the system.Then,according to the different time scales studied,each part of the grid-connected system is reasonably simplified and the simplified characteristic equation is solved.Then the analytical stability criteria at different time scales are obtained by using Routh-Hurwitz criterion,and the mechanism explanation of the stability of the system at different time scales is given.Finally,the boundary of the stability criterion is visualized by using the analysis method of feasible region,and the accura

关 键 词：永磁直驱风机 串补 小干扰稳定性 稳定判据 可行域 

分 类 号：TM712[电气工程—电力系统及自动化]