Abstract：As power system interconnection between utilities increased, the traditional method of frequency dynamics analysis based on the single-machine model no longer adapted to the modern power system. A method for frequency dynamics analysis and load shedding assessment is proposed in this paper, which maps the simulation trajectories in the multi-machine space to a single-machine space by using the center-of-inertia transform. This method not only takes advantage of numerical integral method, which is not limited by the model, but also uses the concept of uniform frequency of the single-machine model to compensates the shortage of numerical integral method effectively. The influences of different network structures, and operation modes on the frequency dynamics are analyzed. A new under frequency load shedding (UFLS) scheme is proposed which can not only meet the frequency security requirements of the entire network but also the one of the regional network. Finally, lots of simulation results are compared with the traditional scheme and show that the new method has much more adaptability.
李爱民, 蔡泽祥. 基于轨迹分析的互联电网频率动态特性及低频减载的优化[J]. 电工技术学报, 2009, 24(9): 171-177.
Li Aimin, Cai Zexiang. Frequency Dynamics Analysis and Load Shedding Assessment Based on the Dynamic Simulation Trajectory of Interconnected Power System. Transactions of China Electrotechnical Society, 2009, 24(9): 171-177.
[1] Prasetijo Stud D, Lachs W R, Sutanto D. A new load sheddingscheme for limiting underfrequency[J]. IEEE Trans. on Power System, 1994, 19(3): 1371-1378. [2] 闵勇. 复杂扩展式电力系统中功率-频率动态过程的分析及低频减载装置整定[D]. 北京: 清华大学, 1990. [3] Min Yong, et al. Analysis of power-frequency dynamics and designation of underfrequency load shedding scheme in large scale multi-machine power system[C]. Proc of 1991 IEE APSCOM, HongKong, 1991, 2: 871-876. [4] Anderson P M, Mirheydar M. A low-order system frequency response model[J]. IEEE Trans. on Power System, 1990, 5(3): 720-729. [5] 杨冠城. 电力系统自动装置原理[M]. 3版. 北京:中国电力出版社, 2005. [6] DL 428-91 电力系统自动低频减负荷技术规定[S]. 1991. [7] Xue Yusheng. Fast analysis of stability using EEAC and simulation technologies[C]. Proc of 1998 IEEE Power System Technology Conf., 1998, 1: 12-16. [8] 薛禹胜. 非自治非线性多刚体系统运动稳定性的定量分析[J]. 电力系统自动化, 1998, 22(2): 1-5. [9] 蔡泽祥, 申洪, 王明秋. 评价电力系统频率稳定性的直接法[J]. 华南理工大学学报(自然科学版), 1999, 27(12): 84-88. [10] 刘梦欣, 王杰, 陈陈. 电力系统频率控制理论与发展[J]. 电工技术学报, 2007, 22(11): 135-145. [11] 赵成勇, 胥国毅, 何明锋, 等. 基于改进递归小波的电力系统频率测量[J]. 电工技术学报, 2005, 20(6): 62-65. [12] 吴杰康, 龙军, 王辑祥. 基于数字微分算法的系统频率快速准确测量[J]. 电工技术学报, 2004, 19(4): 93-97. [13] 张介秋, 李爽, 韩峰岩, 等. 电力系统高精度频率估计的谱泄漏对消算法[J]. 电工技术学报, 2005, 20(12): 30-35. [14] Ying Lu, Wen-Shiow Kao, Yung Tien Chen. Study of applying load shedding scheme with dynamic d-factor values of various dynamic load models to Taiwan power system[J]. IEEE Trans. on Power System, 2004, 20(4): 1976-1984. [15] 熊小伏, 周永忠, 周家启. 计及负荷频率特性的低频减载方案研究[J]. 中国电机工程学报, 2005, 25(19): 48-51. [16] Elkateb M M. Analytical techniques for load shedding assessment[C]. IEE Colloq. 1989/147 on Safe-guarding Industrial Plant During Power System Disturbances, 1989: 2001-2010.
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