Abstract
Permanent magnet synchronous generator (PMSG) based wind turbines (WTs) are widely used as grid connected energy sources. Usually, a PMSG based wind energy system is connected to the grid via machine side and grid side converters. From the machine side converter point of view, there are two types of PMSG-based WTs: PMSG with back-to-back voltage source converters, and PMSG assisted with diode rectifier and boost converter. Since most of the research works regarding the PMSG-based WTs are devoted to the former type, this paper deals with the elaborated controller design and stability analysis of the grid connected PMSG based WT assisted with diode bridge rectifier and boost converter. Hence, the linearized average dynamic model of the combined system comprising PMSG, diode rectifier and boost converter is presented. Based on the linearized model, the relation between the PMSG electromagnetic torque and boost converter current is extracted, and then system’s control-loops are developed. Next, small signal stability of the full system comprising PMSG, boost-diode rectifier, dc-link capacitor, GSC, and corresponding controllers is presented and then impact of PMSG speed controller on the stability of the system is examined theoretically and by time domain simulations.
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