Power Electronic Converter Control Techniques for Improved Low Voltage Ride Through Performance in WTGs

The low voltage ride through (LVRT) requirement that has recently been imposed on the majority of new wind park projects has direct implications on the design and sizing of the power electronic conversion component. This paper considers three wind energy conversion systems and compares them in terms of the additional power electronic infrastructure and control that is required to meet the LVRT requirement. The complete detailed models are developed using electromagnetic transients programming and are compared for various low voltage events. The results convincingly show that the turbine that is interfaced through a full converter, using a dump load to limit dc overvoltages, is simple in terms of realization and demonstrates superior performance.