D. P. Kothari

Bibliography on the application of induction generators in nonconventional energy systems

Induction generators are increasingly being used in nonconventional energy systems such as wind, mini/micro-hydro, biogas, etc. The advantages of using an induction generator instead of synchronous generator are well known. Some of them are reduced unit cost and size, ruggedness, absence of separate DC source, ease of maintenance, self-protection against severe overloads and short circuits, etc. An attempt is made in this paper to present an exhaustive bibliography on the application of induction generators in nonconventional energy systems.

On some of the design aspects of wind energy conversion systems

In the overall process of utilizing wind power, two essential components of technical data, i.e. one related to the engineering or performance characteristics of commercially available wind turbine generators, and the other related to the availability of wind resources, are needed. The performance of wind energy conversion systems (WECs) depends upon subsystems like wind turbine (aerodynamic), gears (mechanical), and generator (electrical). The availability of wind resources is governed by the climatic conditions of the region, for which the wind survey is extremely important to exploit wind energy. In this paper, design aspects, such as factors affecting wind power, siting requirements for WECs, problems related with grid connections, classification of wind electric generation schemes, criteria for selection of equipment for WECs, choice of generators, three basic design philosophies, main considerations in wind turbine design, choice between two and three blade rotors, weight and size considerations and environmental aspects related with WECs have been presented.

Automatic Reactive Power Control of Isolated Wind-Diesel Hybrid Power Systems for Variable Wind Speed/Slip

In this article, automatic reactive power control of an isolated wind-diesel hybrid power system having an induction generator coupled with wind turbine for power generation is presented. The mathematical model of the system using reactive power flow equations is developed. The dynamic voltage stability evaluation is based on small signal analysis considering a typical static VAR compensator (SVC) and IEEE type-I excitation system. It is shown that a variable reactive power source, like SVC, is a must to meet the varying demand of reactive power by induction generator and load and to obtain a very good voltage regulation of the system with minimum fluctuations. Integral square error (ISE) criterion is used to evaluate the optimum setting of gain parameters. Finally, the dynamic responses of the sample power system considered with optimum gain setting are also presented.

Automatic reactive power control of wind-diesel-micro-hydro autonomous hybrid power systems using ANN tuned static VAr compensator

This paper presents an artificial neural network (ANN) based approach to tune the parameters of the SVC reactive power controller over a wide range of typical load model parameters. The multi-layer feed-forward ANN with the error back-propagation training is employed to tune the static VAr compensator (SVC) controller for controlling the reactive power of variable slip/speed isolated wind-diesel-micro-hydro hybrid power systems. Transient responses of sample hybrid power system have been presented.

Reactive power control of wind-diesel-micro-hydro hybrid power systems using matlab/simulink

This paper presents reactive power control of isolated wind-diesel-micro-hydro hybrid power system for realistic load disturbance using matlab/simulink. The mathematical model of the system based on matlab/simulink is developed. Reactive power control performance is compared using three different types of Static VAR Compensators (SVC). Transient responses for step plus normally distributed or band limited white noise random change in load have also been presented in this paper.

Discussion and closure of "Bibliography on the application of probability methods in power system reliability evaluation"

R.C. Bansal, T.S. Bhatti and D.P. Kothari comment on the paper by R. Billington et al. The authors are commended for their valuable contributions in the field of power system reliability. They suggest some additional references which may add to the value of the paper. The original authors reply to the comments.

Closure on "Bibliography on the application of induction generators in nonconventional energy systems"

For original paper see Bansal et al. (IEEE Trans. Energy Conversion, vol.18, p.433-9, September 2003). The present authors reply to a comment by Mathur (IEEE Trans. Energy Conversion, vol.19, no.3, p.650, September 2004).