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《Proceedings of the Csee》 1993-06

## Calculation of Unsymmetrical Power System

Wang Chun Liu HuanzhangWuhan University of Hydraulic Huazhong Power Administration& Electric Dispatching Center
This paper presents a new technique based on the compensation method. It divides unsymmetrical power system into two parts-symmetrical and unsymmetrical network. The nodal equations are used for symmetrical network. To unsymmetrical one. we describe it with phase impedance matrix. Through a series of transforms and simplification , we substitute the unsymmetrical network by bus injecting currents to evaluate equations of the symmetrical part. The technique can easily and accurately calculate any unsymmetrical states of power system , including simultaneous faults which can be imagined.
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