Control of Wind Energy Conversion System and Power Quality Improvement in the Sub Rated Region Using Extremum Seeking

Abstract

For the purpose of better utilization and to have control over varying wind speeds we use variable speed wind turbines. The performance mainly depends on the system operating point. In this paper we implement extremum seeking (ES) which is a non-model based approach for maximum power extraction in the region between cut-in speed and rated speed. The convergence of the system depends mainly on the system dynamics so we go for non-linear control based on field oriented approach and also feedback linearization. For achieving maximum power at all wind speeds the outer loop of ES is used to tune the turbine speed in the sub rated region. By adjusting the voltage magnitude and electrical frequency through matrix converter we can achieve a fast transient response. The transient response can be improved by providing inner loop control based on field oriented control. Through this we can avoid magnetic saturation in the induction generator.

Review on control techniques and methodologies for maximum power extraction from wind energy systems

“…20. From (10), it can be interpreted that the output power depends on the TSR and pitch angle, i.e. λ and β, respectively.…”

“…To achieve this objective, a controller is needed for tracking the maximum peak power irrespective of the wind speed. Most often this MPPT algorithm is operated when the wind speed is in the range of V cut_in and V rated [9,10].…”

Power Quality Improvement for Wind Energy Conversion System using Composite Observer Controller with Fuzzy Logic

“…The impact of wind has made many researchers to find an optimum solution for integrating into the grid.The mechanical power w P [20,28,30] generated from the wind turbine is given by the expression, 32 0.5 ,…”

Simulation and Hardware Implementation of Shunt Active Power Filter Based on Synchronous Reference Frame Theory

“…The SAP Filter based on the VSI topology is connected through the capacitor which delivers the supply for the compensation of the current harmonics in distribution system. The Total Harmonics Distortion (THD) [15][16][17][18] has the acceptable limit for both voltage and current. The THD of instantaneous current I1, I2, I3 up to In is given by square root of the mean (average) value of the squared function of the instantaneous values.The THD limit is 5% for Voltage and 8% for Current as per IEEE 519 standards.…”