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An Adaptive Overload Identification Method Based on Complex Phasor Plane
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DOI：10.1109/TPWRD.2016.2553107.png)
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Abstract
En 中文
In view of the maloperation problem in traditional distance protection zone-III caused by overload in lines, an adaptive overload identification method based on the complex phasor plane is proposed in this paper. First, according to the geometric distribution of the measured phasors under different operating conditions, the virtual voltage drop phasor equation is established. And then, the adaptive setting coefficient is calculated and the adaptive overload identification criterion of distance protection zone-III is formed. Finally, by combining the identification criterion with the operating characteristic of traditional distance protection zone-III, the overload in lines can be distinguished from symmetrical faults. Simulation tests on the IEEE 10-machine 39-bus system verify that, the proposed method is able to prevent the distance protection zone-III from maloperating in the case of overload. Furthermore, in the case of overload and symmetrical fault coexisting, the proposed distance protection scheme can also play the role of backup protection effectively.
Keywords:
Adaptive setting coefficient
distance protection
overload identification
virtual voltage drop
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