Recent results in secondary voltage control of power systems

Recent results are reported on a pilot-point-based secondary voltage control in power systems. Similarities and differences compared to the optimal power flow methodology are described, and theoretical background for secondary voltage controller design is reviewed. Two complementary design problem formulations are reported, together with simulations on the New England 39 bus and Bonneville Power Administration 338 bus power system models. The results show the feasibility of the pilot-point approach and reveal the nature of the tradeoffs involved in secondary voltage controller designs.