Investigation of a variable speed wind turbine and DC-link control for a hybrid power system

Abstract

This thesis is about optimization of an existing wind-diesel hybrid power system in 30 kW power range having an intermediate direct current link. The work will spot on several aspects of the system: · Comparison of power sources other than wind power · Passive versus active rectification and compensation · Turbine Control · Battery charging via DC-Link · System Control · Multi-Turbine Setup Therefore, behaviour and control of the major components is to be studied. As there are: a pitched blade rotor, a permanent-magnet synchronous generator (PMSG), IGBT power converters and a PLC-control unit. The task was to implement a new turbine and system control and setup new hardware. Therefore lab tests have been carried out at the Division of Electric Power Engineering at Chalmers University of Technology. As a result improved system behaviour could be achieved. Also the flexibility of the new system for different system configurations has been increased. In addition some basic investigations on how to charge the battery via the DC-Link have been done. A setup for operating multiple turbines is proposed and built in the lab. By that, further tests can be accomplished in the future.