Study on the power generation variation of small-scale wind systems due to PMG Temperature Rise

Small-scale wind energy systems employ a form of control despite the simpler conventional power conversion topology. The paper examines the power generation drop over time of small-scale systems regulated through a predetermined control characteristic. The effect was previously attributed to generator temperature rise. Tests are carried out on an emulator rig to verify and study the effect. It is shown that the system operating point slides on the set control trajectory as the generator temperature rises. The potential to counteract the effect through the use of temperature-matched control characteristics is investigated through a simulation study. The resulting improvement may look conservative but comes at minimal cost.