A Low Cost Front-End Converter With Maximum Power per Ampere for Rooftop Wind Turbines

Implementation of Low-Cost Architecture for Control an Active Front End Rectifier

In AC-DC power conversion, active front end rectifiers offer several advantages over diode rectifiers such as bidirectional power flow capability, sinusoidal input currents and controllable power factor. A digital finite control set model predictive controller based on fixed-point computations of an active front end rectifier with unity displacement of input voltage and current to improve dynam...

A SCR crowbar commutated with power converter for DFIG-based wind turbines

This paper presents an active crowbar, constructed with silicon controlled rectifiers (SCRs), for doubly fed induction generator (DFIG)-based wind turbines to fulfill low-voltage ride-through (LVRT) requirements demanded by grid codes. By this design, not only the active deactivation of the costly IGBT crowbar, replacing the passive crowbar for this ability, can be achieved with the more cost-e...

Power curves for wind turbines

The concept of a power curve is introduced, as well as the principles of the power conversion performed by a wind turbine. As an appropriate approach for the estimation of the annual power production of a wind turbine, the procedure to determine the power curve after the international standard IEC 61400 of the International Electrotechnical Commission (IEC) is discussed. As another approach is ...

Maximum Power Extraction from Utility-Interfaced Wind Turbines

A Low-Cost Robust Front-end for Embedded ASR System

In this paper we propose a low-cost robust MFCC feature extraction algorithm which combines noise reduction and voice activity detection (VAD) for automatic speech recognition (ASR) system of embedded applications. To remedy the effect of additive noise a magnitude spectrum subtraction method is used. A VAD is performed to distinguish speech signal from noise signal. It discriminates speech/non...