Control System For PMSG Turbines Against Grid Disturbances

Abstract

One of the most common reports for disconnection of wind turbine units in wind farms when they occur in the face of external short circuits, these faults are felt by the wind turbine units as voltage dips and deactivate the units very quickly. This work provides the study of the operation of variable speed synchronous wind turbines connected to the grid and the problems that these control systems present in the face of disturbances, such as voltage dips. Computational tools were used to evaluate the behavior of the control system in the face of disturbances caused by voltage dips; Matlab software was used to study the events that generate the disconnection of the generation units, instead of mitigating the effects. It was determined that the control system confuses the voltage reduction with lack of wind and sends orders to maximize the wind resource, and then the momentary action of the braking units in the presence of a voltage dip is originated. It was concluded that the control system tolerates voltage dips depending on their depth and duration, the highest value being 50% of depth (voltage) and ranges less than 300 milliseconds of duration.