Wind energy is the fastest growing renewable energy source. Double Fed Induction Generator, which is predominantly used nowadays in wind turbines, is very sensitive to grid disturbances and can damage the power electronic converters due to over voltage and over current. Therefore, protection elements which disconnect the machine during fault are very essential. But, in such cases, the reliabili...

Aiming at the problems of low efficiency and accuracy in manual detection winding angle wire spacing during automatic high-voltage primary coils transmission distribution transformers, a scheme using machine vision is proposed. Firstly, coil image acquired by industrial camera, region segmented, ROI (region interest) pre-processed. For detection, we propose slicing method for graying to reduce ...

This paper studies the effect of stator winding configuration on the performance of five-phase induction machines under healthy as well as faulty conditions. The study compares two connections, namely, star and pentagon connections. The comparison is conducted using both simulation and experimental results. The steady state model based on symmetrical components theory is introduced for both con...

A novel neuro controller based simple neuro-structure with modified error function is introduced in this paper. This controller consists of two independent controllers, known as the voltage regulator and the angular controller. The voltage regulator is used to modify terminal voltage for the purpose of tracking a reference voltage. The angular controller is utilized to guarantee the stability o...

Power gating is often used to reduce power of a system which is in the form of a finite state machine (FSM). Power gating can be applied to turn OFF the inactive sub-machine which is obtained after partitioning the FSM by gating the supply voltage. Adjustment of supply voltage of one submachine for ON to OFF or OFF to ON state needs time, called wakeup time which affects the partitioning of FSM...

since it is essential to deliver smoothed sinusoidal voltage to the customers, diagnosing power quality (pq) events has played important role in power delivery and conversion. this diagnostic scheme should be accurate to classify pq events from other events in power system. also it should be fast enough to rapidly mitigate pq events. in this paper, an algorithm based on core vector machine (cvm...

This paper proposes a machine-learning-based framework for voltage quality analytics, where the space phasor model (SPM) of three-phase voltages before, during, and after event is applied as input data. The proceeds along with three main steps: (a) extraction, (b) characterization, (c) additional information extraction. During first step, it utilizes Gaussian-based anomaly detection (GAD) techn...

VFT (variable frequency transformer) has been recently used as an alternative to HVDC (high voltage direct current) to control power flow between asynchronous networks. VFT consumes less reactive power than a back-to-back HVDC system, provides faster initial transient recovery, and has better natural damping capability. VFT is simply a DFIM (doubly-fed induction machine) where the machine torqu...

A new indirect stator flux field-oriented output feedback control for Doubly Fed Induction Machine is presented. It assures global exponential torque tracking and stabilization of the stator-side power factor at unity level, provided that electric machine physical constraints are satisfied. Based on the inner torque control system, a speed tracking controller, with load torque compensation is d...