抄録
FACTS devices such as high-speed phase shifter and variable series capacitor enable us to control active power flow in order to avoid thermal constraints on transmission lines, resulting in an increase of the network loadability and a reduction of production cost. However where to place these devices is an essential matter because their effects considerably depend on the locations. From an economic point of view, the investment cost must be taken into account as well as the reduction of the production cost. Therefore we propose to maximize return on investment (ROI) by searching not only the best location of FACTS devices but also the rating of each device. This problem is expressed as combinatorial optimization problem nested by nonlinear optimization problem. To solve this problem, tabu search incorporated with nonlinear programming method is used. And we discuss the remedial control of FACTS devices and simultaneous consideration of multiple load conditions. By considering remedial control, we can make better use of FACTS devices. Multiple load conditions bring us more appropriate solutions. Because the consideration makes our problem more difficult to solve, some efforts are necessary to be made. Numerical results are shown for a 3-generater 41-line model system and a 5-generator 42-line model sysytem.
