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Wide-area load model validation using disturbances is difficult because the large number of load buses makes the problem intractable. One method to mitigate this problem is to reduce the number of buses on which dynamic models are implemented. In this paper, we define the region of influence (ROI) as those buses which are most impacted by the disturbance, and we propose using the ROI to determine...
The paper presents a sensorless sliding mode observer for the flux magnitude of the induction motor (IM) drive. In order to implement a vector control scheme for the IM, the angle of the rotor flux and the flux magnitude are needed. To obtain them, it is typical to use a stationary frame flux observer - once the α, β flux components have been estimated, they are used to compute the flux angle and...
In the paper, a model predictive controller (MPC) for the position control for an induction motor drive with an elastic connection is presented. The control methodology enables the drive's safety and physical limitations to be directly incorporated into control synthesis. The effect of the predictive horizon on the drive performance is examined. The theoretical consideration are supported by experimental...
Regarding to dispersed generation field, an islanding is known as a situation that those generators are disconnected from the utility feeders and a bunch of local loads being powered by them is isolated. Accordingly, anti-islanding schemes are used to immediately detect that phenomenon in facilitating the detachment the DG or adaptive controlling of autonomous operation. Negative-sequence impedance...
The paper provides a formulation and solution for the problem of optimizing power flows in polyphase power systems with significant source (line) impedance with the presence of linear and nonlinear loads. An optimal solution considering significant line impedance has been already obtained in recent works. Unfortunately, it relies on network and load parameters that are not easy to determine during...
Voltage surges with fast rise times of the order of fractions of a microsecond can severely stress the motor winding insulation. If this insulation material does not have the appropriate dielectric strength and thickness, this voltage surge will result in the electrical breakdown in the first few turns in the stator winding of the motor. This insulation failure will result in a high turn-to-turn current...
Most process plants employ automatic switching schemes to maintain operation through power system disturbances. An understanding of motor behavior through such disturbances is helpful in the application of selective fault clearing, fast bus transfer, and delayed bus transfer schemes. Results and conclusions of computer aided transient studies of major industrial plants performed over the past eight...
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