Since the beginning of the 90's, many countries have experienced a substantial growth of distributed generation (DG) on their power systems. If currently in most countries, either a constant power factor regulation, or a constant reactive power regulation are specified by the Distribution System Operators (DSO) for a distribution network grid connection, in the future, the use of a more elaborated voltage regulation (for instance based on a voltage set point) is expected. The choice of an elaborated set point based voltage regulation brings more flexibility by further optimising the network operation whereas there is no voltage constraint. Indeed, the choice and design of a DG voltage regulation should be the result of an optimisation maximizing the benefits to the whole network. It can for instance be performed in order to: - facilitate the grid connection of both power production units and consumers installations, and so to reduce the connection costs, - limit active power losses on the network, - limit the cost related to the reactive power exchanges between the distribution and the transmission systems, - improve network stability.