Download Abstract - 1000kv technologies

Space Vector PWM Control Synthesis for an H-Bridge Drive in Electric
Vehiclesd
Aim: Controlling a Prototype electric vehicle by using Space vector modulation (SVM) PWM
techniques with respect to Direction control system.
Abstract:
This paper deals with a synthesis of Space Vector PWM control methods applied for an Hbridge inverter feeding a Permanent Magnet Synchronous Machine in Electric Vehicle
application. First, a short survey of existing power converter architectures, especially those
adapted to degraded operating modes is presented. Standard SVPWM control methods are
compared with three innovative ones using EV-drive specifications in the normal operating
mode. Then, a rigorous analysis of the margins left in the control strategy is presented for a
semiconductor switch failure to fulfill degraded operating modes. Finally, both classic and
innovative strategies are implemented in numerical simulation; their results are analyzed and
discussed.
Space vector modulation (SVM): is an algorithm for the control of pulse width modulation (PWM). It
is used for the creation of alternating current (AC) PWM waveforms;
PRINCIPLE
Space vector modulation (SVM) Pulse width modulation (PWM) is a method for binary signals
generation, which has 2 signal periods (high and low). The width (W) of each pulse varies
between 0 and the period (T). The main principle is control of power by varying the duty cycle.
Here the conduction time to the load is controlled. Let for a time t1, the input voltage appears
across the load i.e. ON state and for t2 time the voltage across the load is zero.
• The average voltage at output is given by Va = Vmax. *
Where,
TON
=Time period for Pulse ON,
TOFF
=Time period for Pulse OFF
WORKING
Pulse width modulation is implemented using a microcontroller, dependent on an input value for
generating variable pulse widths, for driving motor at variable speed.
Therefore, the input value used is given with the help of potentiometer.
The 2 terminals of potentiometer are connected to Vcc& GND, resulting in variable voltage in
range of 0-5V, in the terminal W of potentiometer. This pin serves as the input for
microcontroller.
The ATmega8 has inbuilt 10 bit ADC (Analog to Digital Converter), which means it can convert
any analog value between 0-5V to digital value of 10 bit resolution.
The program for generating results for pulse width is written into microcontroller’s memory
using ISP (In System Programmer).
Conclusion: So by using this Space vector modulation (SVM) pulse creation technique is an
electric vehicle can secure travels with respect to user interface control.