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This paper presents the simulated and measured results of switching transients of the laboratory Microgrid system of the companion paper in Part I that implements a web-based monitoring system using an industrial PLC and campus internet. The studied laboratory Microgrid system consists of two wind induction generators, an AC-to-DC converter, a DC-to-AC inverter, a PV module, a UPS, and a battery module,...
This paper develops a framework for analysis of harmonics in a doubly fed induction generator (DFIG) caused by nonsinusoidal conditions in rotor and unbalance in stator. Nonsinusoidal rotor voltages are decomposed into harmonic components and their corresponding sequences are identified. Induced harmonics in stator are analyzed and computed, from which the torques produced by these interactions between...
This paper presents the models of a five-phase interior permanent magnet machine (IPM) feeding a rectifier resistive load. The model predicts the performance of a machine with a non-integer number of stator slots per pole. Using the stationary and rotor reference frames, the approximate diode switching functions are derived. Then harmonic balance technique is used to obtain the steady state average...
In this paper the steady state analysis and control of double-output induction generator (DOIG) for variable speed wind energy conversion system is studied. The objective is to analyze the performance of DOIG under steady state conditions. In addition, IGBT based current regulated voltage source converter with carrier-based sinusoidal pulse width modulation (PWM) method for rotor side converter has...
Doubly Fed Induction Generator (DFIG) is largely used in wind generators. It provides variable speed characteristics in a cost-effective way. The main drawback of this machine is its sensitivity to grid disturbances. Voltage dips cause overvoltages to appear in the rotor that can surpass the converter limits. Additionally, variations of the grid voltage cause the stator flux to oscillate at the grid...
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