抄録
This paper discusses the feasibility of a decentralized voltage control scheme for large scale power systems. The algorithm is intended to apply to reactive normal operating state from emergency state caused by ill-condition and also to keep the operating state away from approaching unstable boundaries in preventive control. The procedure for releasing voltage deviation (over/under voltage) is formulated as a multi-stage decision process over a certain time interval. The optimization problem is transformed into a two-point boundary value problem using the discrete maximum principle and is solved easily by using the discrete Riccati equation. For a large-scale power system, control values need to be computed from a large number of state variables, and this inevitably prolongs the slow dynamics with controllers. The centralized control system in a large-scale system cannot be justified from the economical and technical points of view. To resolve above problems, we present a decentralized voltage control system incorporating slow voltage dynamics.
