PowerPoint Presentations

PowerPoint Presentations Of Computer Engineering

Here you get some useful presentations of Computer Engineering

PowerPoint Presentations Of Electrical Engineering

Here you get some useful presentations of Electrical Engineering

PowerPoint Presentation On Electric Scooter

Electric Scooter PPT

For Download Click Here (PPT)

Electric Scooter Presentation Transcript:

1. INTRODUCTION
In the simulation and modeling of electric scooter we replace the D.C. motor by a single phase induction motor,this makes it low cost and less maintenance and more impressive. The electric scooter of 0.26 KW rating was employed for test. As a result, a single phase induction motor showed ability to drive an electric scooter with 80 kg load at almost constant speed of 20 kph.

2. PRINCIPLE OF AN ELECTRIC SCOOTER
In this system, a dedicated DC/DC converter connected to the grid charges the batteries. Than another DC/DC converter is used to convert the battery voltage to a suitable voltage for the DC motor.

3. SIMULATION OF ELECTRIC SCOOTER
A whole system simulation of an electric scooter drive system consist of three main parts Power supply interface Battery storage Power electronic interface Motor drive performance Electric vehicle movement simulation

4. POWER SUPPLY INTERFACE
Battery is vital to energize overall energy to the entire system. A simple battery model can be represented by a Thevenin’s equivalent circuit. V=E-IR0

5. BATTERY MODEL
The model represents the nonlinear characteristics of the battery. R1:-plate internal resistance D1,D2:-hysteresis and non linear internal resistance effects in the electrochemical cell D3:-charge leakage C1:-linear capacitive storage elements across the double layers C2:-chemical reaction storage

6. Example:- A model of Ni-Cd In this model the system voltage,312 volt, consists of 228 series connected cells.

7. BATTERY EQUALIZATION
Typical charge profiles published for rechargable batteries,particularly large lead-acid batteries used in electric vehicles,are designed to accomplish two goals.Obviously they deliver the energy that is stored in the individual cells.Less well recognized is that the preferred charge profiles overcharge the cells to force equalization.

8. TYPICAL BATTERY STACKS
Lead acid batteries are typically sold in 6v or 12v monoblocks. By proper choice of capacitors,MOSFETS and switching frequency,the equalizers ensures that no cell voltage ever strays from the mean.

9. PASSIVE EQUALIZATION
It has been found that allowing a 12v battery to float at its termination voltage for some period of time will equalize the relative chemical states.This is referred to as “PASSIVE EQUALIZATION”

10. For more info. please refer our PPT. Thanks.

PowerPoint Presentation On Power Quality Parameters

Online Measurement Of Power Quality Parameters PPT

For Download Click Here (PPT)

Power Quality Parameters Presentation Transcript:

1. INTRODUCTION
This presentation provides an overview of the time varying power quality issues in power systems. A new signal processing techniques for real time measurement of various power quality parameters. The definition of Power Quality cannot be limited to the characteristics of the supply power. The definition must also include the requirements of the load. Signal processing techniques are applied for real time measurement of power quality parameters such as frequency, harmonics, flicker and disturbances.

2. (1) Digital filtering technique 2) Kalman filter technique (3) Fast Fourier Transform and statistical method (4) Multi-resolution signal decomposition techniques based on wavelet transform

3. FREQUENCY MEASUREMENT
In many power system protection and control schemes it is necessary to accurately measure and track the fundamental power frequency under sinusoidal and non-sinusoidal conditions There are various methods zero crossing methods FFT leakage Stationary phase changes Least squares fitting.

4. SIMULATION RESULTS
The method has been tested under various conditions using the simulation software MATLAB. Simulation is run for 24 hour period with new inputs every 2 minutes. Output can be analyzed for each component individually or collectively by looking at the THD (bottom). CASE-I

5. CASE -II
Simulation results concludes that the maximum error of this model is less that 0.005% under non-sinusoidal and multiple zero crossing conditions.

6. HARMONICS MEASUREMENT
Due to increased utilization of power electronics devices voltage and current waveforms of a distribution or a transmission system are not pure sinusoids but consist of a combination of the fundamental frequency, harmonics and high frequency transients The DFT and FFT transform is a useful analytical tool that has been applied to power system for phasor measurement and harmonic analysis.

7. FLICKER MEASUREMENT
Flicker is basically caused by fluctuations of the electrical power network that may occur at any time under the influence of the variations of any of the three components of the network Voltage fluctuations up to 30Hz may produce annoyance even if considering small relative amplitudes such as 0.25% at the critical modulation frequency of 8.8Hz the use of FFT and new statistical block for real time measurement of flicker in power system.

8. SIMULATION RESULTS
The simulation is carried out in MATLAB for flicker measurement.

9. WAVELET BASED SIGNAL DECOMPOSITION TECHNIQUE
Wavelets can determine the presence of transients and harmonic distortions of very small values: up to less than 0.5%. With values around 0.1% the detail coefficients can hardly detect the transient and harmonics. The color map seems more helpful in identifying both transients and harmonics as the magnitude both transients and harmonics values go bellow 0.5%.

10. For more info. please refer our PPT. Thanks.