Lead-lag PSS design satisfying H∞ control performance using particle swarm optimization

The aim of this paper is to describe how to obtain robustness of a power system stabilizer (PSS) which has existing controller structure in a smart manner. In recent years, robust PSS designs that adopt an H∞ controller have been investigated in order to guarantee the performance when the state of the system configuration and power flow change. However the H∞ controller has not been widely adopted into practical use because of the intricate nature of its theory and structure. We consider the H∞ control problem under the condition that PSS structure is fixed to be a lead-lag compensator. We optimize the parameters of the lead-lag PSS by a particle swarm optimization (PSO) that has an evaluation function which takes into account a closed loop H∞ norm and a desired response. In this way, we design a smart PSS which has a conventional controller structure and guarantees its H∞ control performance.

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