Abstract
In multi-zone power systems, load distortion in each zone can cause system's frequency deviation in each zone and the power fluctuation in transmission lines between areas. The purpose of this study is to reduce frequency fluctuations of areas and the power of transmission lines at the time of failure. In the following paper, the effect of a sudden load change in a two-zone power system with thermal-thermal production units has been studied and it is shown that nonlinear Governor responses cause an undamped oscillation in transient and durable responses of power in the transmission line and in frequency inside the area. To stabilize the system for this disruption, two methods have been employed and the system performance has been analysed for these two modes. In the first case, a thyristor-controlled phase shifter (TCPS) is installed in series with the transmission line between the system regions and a superconducting magnetic energy storage (SMEs) in the terminal of the second zone. In the second case, two superconducting magnetic energy storage devices (SMEs) are placed in the terminals of two regions and simulation results are presented. These results indicate that system stability is improved in the first case, and in the latter one, stability will be better than the first one.
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