Rajveer Mittal

Battery energy storage system for variable speed driven PMSG for wind energy conversion system

There are many loads such as remote villages, islands, etc. that are located far away from the main grid. These loads require stand-alone generating system, which can provide constant voltage and frequency for local electrification. Locally available wind power can be used in such off-grid systems. As the wind speed is variable, an AC-DC-AC conversion system is required to convert variable voltage and variable frequency power generation to constant voltage and constant frequency source. Further, as the wind power as well as load is variable there is a need of energy storage device that take care of the load mismatch. In this paper, a standalone wind energy conversion system (WECS) using a variable speed permanent magnet synchronous generator (PMSG) is proposed with a battery energy storage system.

Improved performance of diesel driven permanent magnet synchronous generator using Battery Energy Storage System

Battery Energy Storage System (BESS) is used for load compensation of a permanent generator synchronous generator driven by diesel engine to enhance its performance. The control of BESS with capabilities of reactive power, harmonics and unbalanced load compensation is achieved by indirect current control scheme. The modeling of the DG set is performed using permanent magnet synchronous generator (PMSG) by keeping the excitation constant. The voltage at PCC is controlled using BESS under various loads. The system is simulated under MATLAB environment using Simulink and PSB Block-set toolboxes. The simulated results for a 30 kVA DG set with linear load, and nonlinear load with different load dynamics and unbalanced load conditions are presented to show the effectiveness of the BESS-PMSG system.

PMSG based isolated wind energy conversion system (WECS) for variable load

Wind energy, being a clean and renewable source, is becoming more popular day-by-day. Wind energy is also economical and feasible in areas where electricity is not available due to high cost of distribution. The main disadvantage of wind power has been its unreliable nature which results in load mismatching. So an energy storage device is needed. Variable nature of wind results in variable voltage and variable frequency at generator. So an AC-DC-AC link is required. In this paper, we have proposed a simulation of wind energy conversion system (WECS) using a variable speed permanent magnet synchronous generator (PMSG) with battery as an energy storage device for an isolated load to prevent load mismatching.

An advanced frequency drift method for islanding detection of an inverter interfaced grid connected distributed generation

The frequency relays are unable to detect islanding of a distributed generation when the active power mismatch is below 11%, at the event the islanding has occurred. The proposed technique has been implemented for islanding detection of an inverter interfaced grid connected distributed generation for such a worst case. The scheme incorporates reactive current injection scheme to the existing frequency relay protection, which helps in suspecting islanding during the worst case, which is further reconfirmed with the help of a load shedding scheme to avoid the possibility of false detection. Computer simulation is done with MATLAB.

A hybrid electric vehicle with incorporation of VaReB technology

The development and Innovative designing of Electrical Locomotives has become the need of the hour in the existing situation globally as a consequence of two major factors. One of them being the steeply rising prices of Crude oil and the constant damage being imposed on the environment due to harmful substances in the atmosphere due IC Engines. The Electric Vehicle essentially consists of BLDC Hub Motor, SMF Batteries, Stock Chassis and the Regenerative Braking module. Regenerative Braking basically transmits the Kinetic Energy of the wheel due momentum into Electrical Energy which is otherwise wasted. The Regenerative module (VaReB) works on the principle of application of Variable Capacitances into the circuit to harness the desired level of Braking and hence the Regenerated Energy.

Implementation of VaReB technology on electric vehicle

Due to steeply falling reserves of fossil fuels and ever rising prices of Crude Oil, the need for an alternative system to replace IC(Internal Combustion) Engine driven Vehicles for the purpose of Transportation has become a necessary action. Electric Power Vehicles can play a critical role in the substitution to traditional Fossil Fuel powered Vehicles on the globe. Electric Vehicles (EV) functional setup comprises essentially of BLDC Hub Motor, Battery Array, Stock Chassis and Regenerative Braking Module which has been modified, designed and developed to achieve the desired function. The VaReB Technology enables the commuter to attain the desired level of Regenerative Power. This is accomplished by variation in the values of Capacitances in the Circuit which is physically controlled by the Electric Brake paddle attached to the Chassis of the Vehicle.

Panda smiled again - Credit goes to repeated early stage computed tomography scan: An interesting case report

Abstract Extradural hematoma (EDH) is considered to be a rare in head trauma associated with arrested hydrocephalus, and represents a serious pathology from which complete recovery can be expected if urgent intervention done in time. In this case report, the authors present an arrested hydrocephalus patient who was apparently asymptomatic at the time of hospital admission with a mild head injury and developed rapidly increasing size of EDH. The value of repeated early Computed tomography (CT) scan and the pathogenesis of rapidly increasing size of EDH in arrested hydrocephalic patient are discussed.

Bilateral basal ganglia haemorrhage following motor vehicle accident: A Case report

Abstract Bilateral basal ganglia haemorrhage following motor vehicle accident is extremely rare in field of neurosurgery. This is presumed to be secondary to rupture of lenticulostriate or Anterior Choroidal artery by shearing, as a result of acceleration/deceleration forces. Although the exact mechanism is still not known. Isolated bilateral basal ganglia haemorrhage carries favourable prognosis. We report a rare case of 50 years old lady having bilateral basal ganglia haemorrhage with diffuse axonal injury following motor vehicle accident. Patient was managed conservatively and improved.

Fault ride- through capability of grid connected variable speed permanent magnet synchronous generator for wind energy conversion system

This paper discusses the interconnection issues of variable speed permanent magnet synchronous generator (PMSG) connected to grid as per prevailing grid standards during healthy and fault conditions. The variable speed operation of PMSG has been demonstrated while feeding the real power to the grid keeping DC link voltage constant. Further, the fault ride-through capability of PMSG has been demonstrated using MATLAB Simulink based simulations.