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The recent computing and communications technologies have made possible implementation of different advanced techniques for power system steady and post- emergency operating conditions control. Multi-agent systems (MAS) is one of these techniques. The paper presents an emergency control system based on multi-agent technique. The control system is able to find a coordinated control action (load shedding, generation change) to prevent the violation of power system voltage stability. The model of the test power system was simulated in Matlab/PSAT software. Multi-agent system has been implemented in Java language using JADE (Java Agent Development Framework) package. The efficiency of the proposed technique has been proved by numerical simulations under different power system operating conditions and for different emergency situations.