A Novel Algorithm for Fast and Efficient Speed-Sensorless Maximum Power Point Tracking in Wind Energy Conversion Systems

A New Application of the Multi-Resonant Zero-Current Switching Buck Converter: Analysis and Simulation in a PMSG Based WECS

“…In order to produce power over all wind speed some topologies applied to low power operating in discontinuous conduction mode (DCM) have been presented in the literature by [16,20,21] where the rectification is carried out by a bridge rectifier diode, or as in [22], where a rectifier diode plus a DC-DC boost converter is used [23] as shown in Figure 1. This is a simple, cost effective and higher-power-density solution [24].…”

Overall Description of Wind Power

“…But on the other hand, one significant drawback is the possibility of failure to quick changes in wind speed [8] [30]. To improve the conventional P&O algorithm, several modifications have been proposed, one of the most representative is the variable step-size [30] [27] [31], where the step-size is automatically updated depending ing.cienc., vol. 10, no.…”

Intelligent maximum power extraction control for wind energy conversion systems based on online Q-learning with function approximation

“…Then, the subsequent state s t+1 is observed with an immediate reward r t+1 and the maximum Q-value corresponding to s t+1 , max , , is picked out. The recorded Q t (s t , a t ) will be updated according to (4). The parameter 0,1 is the learning rate, which determines how far the currently estimated Q t (s t , a t ) is adjusted toward the newly estimated Q-value max , .…”

“…Therefore, it is also widely used in WECSs. Many advanced HCS methods have been proposed to solve the problems of the traditional HCS method, such as oscillation around the maximum power point (MPP) and wrong searching direction when the wind speed changes [3], [4]. However, the HCS methods have no learning ability and search for the MPPs all the times without any memory.…”