A multiagent system for microgrids

This paper presents the capabilities offered by multiagent system technology in the operation of a microgrid. A microgrid is a new type of power system, which is formed by the interconnection of small, modular generation to low voltage distribution systems. Microgrids can be connected to the main power network or be operated autonomously, similar to power systems of physical islands. The use of MAS technology can solve a number of specific operational problems: the small DG (distributed generation) units have different owners, so centralized control is difficult. Several decisions should be taken locally. Lack of dedicated communication facilities. Microgrids will operate in a liberalized market so the decisions of the controller of each unit concerning the market should have a certain degree of "intelligence". The local DG units besides selling power to the network have also other tasks: producing heat for local installations, keeping the voltage locally at a certain level or providing a backup system for local critical loads in case of a failure of the main system. These tasks reveal the importance of the distributed control and autonomous operation.