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This paper analyzes the effects of two control strategies on doubly-fed induction generator (DFIG) based wind turbine under unbalanced voltage then a new control strategy is proposed to achieve more advanced performance of it. In these control strategies, the rotor side converter (RSC) and grid side converter (GSC) are controlled in two positive and negative ((dq)+ and (dq)-) reference frames so that...
This paper presents an analysis of the torque ripple of a six-phase fault tolerant permanent magnet synchronous machine (PMSM6) for electrical power steering system (EPS) applications. Opened stator phase is the realistic fault condition that can be imagined for a machine fed by a power converter drive system. The behavior of the machine was analyzed under three different winding fault conditions...
This paper presents a new fault diagnostic technique applied to switched reluctance motor (SRM) drives. A fault is detected when the measured amplitude of the DC bus current differs from its expected amplitude, assuming normal operating conditions. The information about phase currents amplitudes and the control states of all power switches permit to easily estimate the amplitude of the power converter...
A new fault diagnostic parameter, applied to switched reluctance motor drives, is presented. The proposed parameter is a partial average power based on the power converter supply current and the rotor mechanical position information. At high speed operating conditions phase current is not regulated and the machine closed-loop control only needs to observe one current, which is the power converter...
This paper presents analysis and control techniques for a doubly-fed induction generator (DFIG) used in wind energy systems under unbalanced grid conditions. The rotor currents and electromagnetic torque of the DFIG under unbalanced conditions are first analyzed. Negative sequence circuit models are investigated. Control strategies implementing negative sequence compensation from either the grid-side...
A polar chart of the power converter supply current, comprising phase currents and rotor mechanical position information, is presented, in order to characterize the dynamic operation of a SRM drive. Power converter supply current can be used as additional information of extreme importance when a sensor error or failure occurs. Its analysis is then important and permits to develop appropriate fault...
Renewable energy harvesting is of prime interest in lieu of increasing demand for energy and high price of fossil fuels. Albeit the diminishing resources of petroleum and natural gas has given a renewed attention to the topic. Wind energy is by far the most accessible and efficient form of renewable energy forms given the state of technology in other renewable resources i.e., solar, fuel cells, etc...
One of the main features of a switched reluctance motor is its fault tolerance capability. However performance deterioration is clearly evident when one phase is removed. This paper presents a fault tolerant power converter, applied to a four phases switched reluctance motor. Some possible additional connections on the commonly used asymmetric bridge converter are introduced to secure the operation...
The doubly-fed induction generator (DFIG) with back-to-back four-quadrant power converters between the rotor side and the stator side can realize an efficient and flexible conversion from wind energy to electric energy. Based on the stator-flux orientation control strategy, this paper aims to introduce a synergetic control synthesis method and applies this method in the control of the DFIGpsilas rotor-side...
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