This paper deals with the control of the output voltage of ship on-board electrical networks when a load is connected to or disconnected from the network. In some cases this kind of disturbances can create high deviations from the nominal behavior. This includes high oscillations which can damage the network and that a classical controller cannot efficiently attenuate. The idea is to take advantage of the knowledge that an electrical device is switched on, to anticipate the disturbance. An anticipative adaptive optimal control law is tuned to create better conditions to attenuate the disturbance.