Applicability analysis of out-of-step splitting criteria under multi-frequency oscillation

作者：Xia, Chengjun^*; Chen, Cuiqiong; Tu, Liang; Chen, Yiping; Men, Kun

来源：Automation of Electric Power Systems, 2016, 40(4): 26-31.

DOI：10.7500/AEPS20150525008

• Apparent impedance angle
• Applicability analysis
• Asynchronous operation
• Electrical quantities
• Oscillation center
• Out of step
• Phase angle differences
• Power system stability

The criteria for out-of-step separation equipment in current domestic engineering fields are acquired from the out-of-step two-machine equivalent power system. Its applicability under multi-frequency oscillation is yet to be found out. Expressions of electrical quantities are inferred based on a three-machine equivalent system. And it is found that the out-of-step center would migrate between different transmission lines and different positions even on one and the same transmission line. In addition, the more distinct the different modulations are, the more transmission lines will there be for the out-of-step center to migrate in between. Besides, the three out-of-step splitting criteria based on Ucos φcharacteristic, the measured impedance locus and the apparent impedance angle can hardly adapt to the multi-frequency oscillation scenario. It is advised that the two splitting criteria, apparent impedance angle and phase angle difference cooperate with each other to improve the correctness of out-of-step separation equipment.

• 出版日期2016-2-25
• 单位南方电网科学研究院有限责任公司; 华南理工大学