Low power autonomous wind system automatic control

This paper deals with automatic control of a low power wind system based Permanent Magnet Synchronous Generator — PMSG, as a first step from designing and analyzing of a distributed systems (up to 5 kW) for generating and using electrical energy from renewable sources (wind and photovoltaic). The general system is designed to supply electrical power to consumers, when an electrochemical power storage system (batteries) and also a connection to the national grid are considered, for an appropriate transfer of the excess of the local power production and consumption. For this distributed system, hierarchical control structure design will be focused on the upper-level control structure synthesis, using advanced control methods. The subject of this paper is the local control of the wind turbine system, consisting in maximum power conversion for partial load regime and power limitation for full load regime. The control strategies solutions are studied for ensuring the wind turbine system stability at transitions between partial and full load regime also. The research results are obtained through numerical simulation in Matlab/Simulink software.