Abstract
The unified power flow controller (UPFC), with its unique combination of fast shunt and series compensation, is a powerful device which can control three power system parameters. In planning and designing such devices in power systems, power engineers must consider the impact of device internal limits on its performance. This paper develops a power injection model (PIM) based UPFC control approach to consider a number of internal limits imposed on the UPFC, including series injection voltage magnitude, line current through the series inverter, real power transfer between the shunt inverter and series inverter, shunt side current and shunt injection voltage magnitude. Constrained control strategies are proposed and tested on a 28-node test system. The numerical results illustrate the effectiveness of the proposed method.
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