A New H∞ Controller Design for Reducing the Short -Circuit Current

In Iran power network especially in Tehran Regional Electric Company like other power systems, Short-circuit current increases by extension of the electrical power system because of rising demand of electrical power. This fault current magnitude is more than the breaker interrupting ratings especially in MontazerQaem power plant. Fault currents have a great influence on power system. For reducing these risks, some expensive or complicated solutions are proposed based on increasing the impedance of power network like FCLs or series reactors or split bus. The approach of this paper is controlling the sources of the faults. It proposes a new solution for reduction of the fault current by a controller. The controller is designed by H∞ mixed-sensitivity minimization method to control the fault current through controlling the field current of the generator. This method is simulated on a generator unit which its exciter system is considered for modeling and control design. The results show that this economical solution is efficient enough

کلیدواژه ها:

Short circuit current ، H∞ method ، power system control