摘要
电力系统是一个复杂的多机时变非自治系统。通过广域测量系统获取的响应轨迹中包含了受扰系统全部的非线性时变因素,能够为系统暂态不稳定的准确识别提供依据。该文从扩展相轨迹表征受扰系统暂态稳定性的基本原理出发,分析了系统非自治因素对扩展相轨迹的影响;针对轨迹上可能导致判据误判的关键点,详细分析了非自治因素对暂态稳定判据的影响;利用实时测量的机组功角及不平衡功率,构建辅助判据识别可能导致误判的非自治因素,增强受扰系统暂态失稳判别的可靠性;通过定义复合功角确定受扰系统的失稳模式,形成了基于实测响应轨迹的系统暂态失稳判别流程。最后,该文针对IEEE39节点系统与复杂交直流混联电网进行了仿真测试,算例验证了辅助判据的有效性,并证实了该方法判别电力系统暂态失稳的准确性和预测性。
Power system is a complex multi-machine time-varying non-autonomous system.The real-time response trajectory obtained by the wide-area measurement system includes all nonlinear time-varying factors of the disturbance system,which can provide a basis for the accurate identification of the system transient instability.In this paper,the performance of the non-autonomous factors of the system on the extended phase trajectory was analyzed,based on the basic principle of the extended phase trajectory characterizing the transient stability of the disturbed system.Aiming at the key points on the trajectory that might lead to misjudgment of the criterion,the influence of non-autonomous factors on the transient stability criterion was analyzed in detail.Using the real-time measured power angle and unbalanced power,auxiliary criteria for identifying non-autonomous factors were constructed to enhance the reliability of transient instability discrimination.The instability mode of the disturbed system was determined by defining the composite power angle,and the process of transient instability identification based on real-time response trajectory was presented.At last,numerical simulations were conducted on IEEE39 bus system and complex AC-DC hybrid grid.The results verified the validity of the auxiliary criteria,and proved the accuracy and predictability of this method to distinguish the transient instability of power system.
作者
朱存浩
马世英
郑超
李鹏华
ZHU Cunhao;MA Shiying;ZHENG Chao;LI Penghua(China Electric Power Research Institute,Haidian District,Beijing 100192,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2021年第15期5077-5090,共14页
Proceedings of the CSEE
基金
国家自然科学基金项目(51777196)。
关键词
广域测量系统
扩展相轨迹
非自治
暂态不稳定识别
wide area measurement system
extended phase trajectory
non autonomous
transient instability identification
作者简介
朱存浩(1989),男,博士研究生,主要研究方向为电力系统稳定分析与控制、电力系统仿真技术、交直流混联系统分析、电力系统调度自动化等,zhu_cunhao@126.com;通信作者:马世英(1969),男,博士,教授级高级工程师,博士生导师,主要研究方向为电力系统分析与控制、电力系统仿真技术、交直流系统分析、源网协调技术等,msy_1969@163.com;郑超(1977),男,博士,教授级高级工程师,主要研究方向为电力系统稳定与控制、交直流混联系统分析、新能源并网技术等。
