المنشورات و المؤلفات
Tripping of one circuit of a heavily loaded double-circuit transmission line may lead to tripping of the healthy circuit due to an out-of-step condition. Out of step is resulted by overloading of the healthy circuit. In this paper, a reliable and...
Time-domain modelling of frequency-dependent line series resistance by a discrete lumped equivalent circuit is useful for simulation, either on a digital computer or on a transient network analyzer. A resistance model that is suggested by Wheeler (1...
Poor voltage regulation is one of the majordrawbacksof an isolated self-excited induction
generator. The terminal voltagemayincreaseconsiderablydue to a small increase in speed.
In most developing countries, unregulated wind-turbinesare often used...
A solar cell array is inherently a nonlinear device consisting of several solar cell modules connected in series-parallel combinations to provide the desired DC voltage and current. At a fixed insolation revel, the terminal voltage decreases...
This paper examines the steady-state analysis and performance of an isolated three-phase self-excited induction generator (SEIG) driven by regulated and unregulated turbines. For the case of a regulated turbine, the equivalent circuit is solved with...
Due to speed fluctuations of unregulated wind-turbines, the terminal voltage may increase to dangerously high levels which have been reported to cause capacitor failure at windfarms. This paper examines the steady-state analysis and performance...
Photovoltaic (PV) powered DC motors driving dedicated loads (e.g. water pumps) are increasingly used in the remote rural areas of many developing countries. The key to their success is simplicity (direct coupling, no DC-AC inversion, no storage...
Photovoltaic (PV) powered DC motors driving dedicated loads (e.g. water pumps) are increasingly used in the remote rural areas of many developing countries. The key to their success is simplicity (direct coupling, no DC-AC conversion, no storage...
A photovoltaic (PV) generator is a nonlinear device having insolation-dependent volt-ampere characteristics. Because of its relatively high cost, the system designer is interested in optimum matching of the motor and its mechanical load to the PV...
A simple step-up converter circuit consisting of a single power transistor and an inductor is used as an interface between a PV (photovoltaic) generator and a shunt DC motor driving a centrifugal water pump. The step-up converter allows maximum...
This paper presents an efficient, and flexible method of steady-state performance analysis of the three-phase self-excited induction generator. The method equates the total real and reactive power of the equivalent circuit to zero. Unlike the...
Distinguishing a balanced three phase fault from a power swing is difficult since both have similar characteristics. In this paper a new algorithm to detect three phase faults during power swings is proposed. The algorithm is based on separating the...
Power distribution system relies heavily on a vast network of medium voltage (MV) underground cables for power delivery. Condition monitoring technologies can, therefore, play a vital role in attempting to target the cables that pose the most urgent...
This paper presents transient and islanding time-domain simulation of grid-connected induction generator feeding induction motor and resistive loads. The behavior of the system following a three-phase short-circuit in the grid network is...
The terminal voltage of a self-excited isolated induction generator (SEIG), supplying a fixed load, may increase considerably due to a small increase in speed, excitation capacitance or both. In most developing countries, unregulated wind-turbines...
The transient behavior of wind-driven induction generator is analyzed. The generator is assumed to be running at steady-state with a certain real and reactive power flow conditions when a sudden disturbance occurs. An example of the disturbance may...
This paper presents steady-state analysis and control of a wind-driven stand-alone 3-phase self-excited induction generator supplying a 3-phase induction motor. The induction motor drives mechanical load (such as a water-pump) which has a given...
This paper presents steady-state analysis of a stand-alone 3-phase self-excited induction generator supplying a 3-phase induction motor. The induction motor is driving a load with a specified speed-torque characteristics. The steady-state equivalent...