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With the increasing levels of distributed generation, the control of voltages within statutory limits across distribution networks becomes challenging. Further, the demand depends on the load busbar voltages to some extent and therefore the voltage control becomes an important means of load control especially at peak load periods. An electronically controlled series compensator based on a three winding...
A dead-time delay is imperative in pulse width modulated (PWM) voltage source inverters in order to prevent a shoot through in the DC link. This delay causes the dead time effect and it results in output waveform distortions. This leads to various undesired characteristics. A simple yet an accurate pulse based dead time compensation technique is presented in this paper which compensates the dead time...
It is anticipated that with increased penetration of micro scale renewable generation sources, electric vehicles and demand response initiatives the voltage of low voltage networks need to be controlled in real time. Commonly used method of voltage control is on-load tap changing. However as this has limitations, an electronically controlled Volt-Var Control (VVC) scheme based on a three winding transformer...
This research touches a major problem in automobile industry. Which is that, the engine cranking fails when the battery is drained to a certain depth of discharge, though the battery has enough energy for cranking, due to the dynamic behaviour of the internal resistance upon the state of charge of a lead acid battery. Our work is focused on finding-out the capability of cranking an internal combustion...
With the growing interest in electric vehicles, battery chargers have taken the interest of researchers. Charging power levels, Efficienc, reliability, low cost, low weight and low distortion to the utility current at a higher power factor are the main focus of such studies. Various types of battery chargers have been introduced to this effect. A charger which generates current pulses for charging...
High Capacity Li-ion and Pb-acid batteries are widely used in present Renewable Energy and EV applications. Consequently, charging these batteries in a minimum amount of time whilst maintaining efficiency is crucial. The need for fast charging has brought up the method of Pulse Charging. However, present pulse charging methods which involve hard-switching, pose problems due to switching losses in...
In order to extract maximum power available from a solar cell in a photovoltaic system, maximum power point tracking should be activated. Several maximum power point tracking (MPPT) techniques have been developed over the past years. In an environment where, varying irradiance levels prevail, time taken to track the maximum power point is important. In this paper, three widely used MPPT tracking techniques...
Statechart formalism has been a preferred choice for modeling complex reactive systems (CRS) in recent years. It has inbuilt powerful features of orthogonality, hierarchy, intermodular communication and history. Once statechart based system modeling is done the next issues to be addressed are (1) modular verification of the system for failsafe operation under all possible working conditions (2) progressive...
The paper proposes an inverter controlling network which integrates demand response and energy management through a smart meter. The network consists of slave controllers each of which has the capability of controlling an inverter. The system incorporates one master controller which handles the communication with slave controllers, a smart meter with a ZigBee module for monitoring the overall power...
Simulation of a maximum power point tracking (MPPT) algorithm prior to implementation is useful in avoiding unnecessary prototyping, fabricating and testing costs. Also upon implementation of the actual hardware system, performance monitoring and recording of the system behavior is of importance. The data manipulated above is useful in energy management and saving applications. To full fill the above...
Perturb & Observe (P&O), and Incremental Conductance methods for MPPT algorithms applied to PV systems with fixed and variable step sizes already exist. This paper proposes a modification to the existing Variable Step Maximum Power Point Tracking (MPPT) method. The method avoids the complications which occur in the algorithm due to sudden, large irradiance changes. The proposed method is experimentally...
The electromechanical transients during a deloading of a DFIG turbine and the Fault Ride Through (FRT) capability of a DFIG wind farm connected through HVDC transmission lines are discussed. The electromechanical oscillations during a deloading operation of a DFIG wind turbine generator are simulated using BLADED software. Then power reduction control during a fault was achieved by reducing the power...
The limitations with regard to the capability of Doubly Fed Induction Generator based wind turbines are discussed. The importance of considering the stability margin when constructing the capability curve was highlighted. Then the total power output vs the reactive power output of the turbine within its capabilities was obtained. A case study was carried out to discuss the capability of a wind farm...
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