基于下垂控制的多端直流系统稳定性分析  

Stability Analysis of Multi-Terminal DC System Based on Droop Control

作　　者：吴琦 邓卫[1,2] 谭建鑫 沙济通 秦晓亮 裴玮 Wu Qi;Deng Wei;Tan Jianxin;Sha Jitong;Qin Xiaoliang;Pei Wei(Institute of Electrical Engineering Chinese Academy of Sciences,Beijing 100190 China;School of Electronic,Electrical and Communication Engineering(EECE)University of Chinese Academy of Sciences,Beijing 100049 China;Xintian Green Energy Co.Ltd,Shijiazhuang 050000 China;Hebei Construction Investment New Energy Co.Ltd,Shijiazhuang 050000 China)

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049 [3]新天绿色能源股份有限公司,石家庄050000 [4]河北建投新能源有限公司,石家庄050000

出　　处：《电工技术学报》2021年第S02期507-516,共10页Transactions of China Electrotechnical Society

基　　金：中国科学院洁净能源先导科技专项(XDA21050100);中国科学院青年创新促进会项目(2018170)资助。

摘　　要：多端直流系统是未来电网的重要形态之一,其稳定控制是保障系统经济、高效运行的重要基础。下垂控制作为多端直流系统的主要协调控制方式,其控制策略以及系统关键参数皆与系统小信号稳定息息相关。为了提升系统稳定性,该文构建基于下垂控制的多端直流系统小信号模型,并采用主导特征值分析方法探究控制器参数、直流侧电容等不同参数对系统稳定性的影响,进一步分析对应的灵敏度,并寻找影响系统稳定性的关键参量。最后通过Matlab/Simulink仿真模型进行证明,结果表明,该文所述方法能够有效揭示影响系统稳定性的关键因素,通过合理调整其大小可以有效改善系统的稳定运行能力,提升系统的直流负荷接入容量。The multi-terminal DC system is one of the important forms of the future power grid,and its stability control is an important foundation for ensuring the economic and efficient operation of the system.As the main coordinated control method of multi-terminal DC system,the control strategy of droop control and key parameters of the system are closely related to the small signal stability of the system.In order to improve the system stability,this paper built a multi-terminal DC system small signal model based on droop control,and used the dominant eigenvalue analysis method to explore the influence of different parameters such as controller parameters and DC side capacitance on the system stability,and further analyzed the corresponding sensitivity,and looks for key parameters that affect system stability.Finally,it was verified by Matlab/Simulink simulation model.The results show that the method described in this article can effectively reveal the key factors that affect the stability of the system.By reasonably adjusting its size,the system’s stable operating capacity can be effectively improved,and the system’s DC load access capacity can be improved.

关 键 词：多端柔性直流 下垂控制 直流电压 小信号稳定 特征值分析 

分 类 号：TM712[电气工程—电力系统及自动化]