Performance evaluation of space vector modulation controlled inverter fed variable speed wind generator during permanent fault

This paper presents low voltage ride through (LVRT) characteristics analysis of variable speed wind turbine (VSWT) driving a permanent magnet synchronous generator (PMSG). The VSWT-PMSG is becoming very popular these days in wind power application. In some recent studies, the transient stability and LVRT characteristic of VSWT-PMSG has been reported using different types of symmetrical and unsymmetrical faults. However, this paper focuses on the LVRT characteristics analysis of VSWT-PMSG during the permanent fault condition due to unsuccessful reclosing of circuit breakers. The frequency converter of VSWT-PMSG used in this study is composed of rectifier, boost converter, and space vector pulse width modulation (SVPWM) controlled DC-AC inverter. The suitable modeling and control strategies of the overall system are presented. The new wind farm grid code is considered in the analysis. Besides the unsuccessful reclosing of circuit breakers, the performance of controller is also evaluated during the case of successful reclosing. Extensive simulation analysis is performed where the effectiveness of the proposed control scheme is verified using laboratory standard power system simulator PSCAD/EMTDC.