q Three Phase Voltage Regulation using SCR and Micro-Controller

Three Phase Voltage Regulation using SCR and Micro-Controller

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Three Phase Voltage Regulation using SCR and Micro-Controller Full Seminar Report, abstract and Presentation download

In our day to day life we use a lot many devices to satisfy our needs or to make our life comfortable and luxurious. Every device needs a power supply, to work on. And for the optimum functioning of the device it is necessary that the supply should be reliable. That is, it should provide a constant voltage.

            But this is not possible always. There are many reasons due to which there is a fluctuation in the supply voltage. This change in the supply voltage may cause the device to damage or make it work in an undesired way, which no one will desire.

            Hence the best alternative is to regulate the supply voltage. This is what we have tried to achieve here. Our project is supply voltage regulation, using controller and SCR.

            Silicon Controlled Rectifiers also called Thyristors controller, employing novel technology, which is designed to provide a price effective solution for applications that require power, current or voltage regulation with some power factor correction and a smother process control. Traditional phase-angle control causes lots of harmonic current distortion on the main power supply. This in turn creates voltage distortion which affects power quality. There is no simple accessory available for reducing this problem.

            However, when simple voltage or current regulation is required often phase-angle control is the most cost effective solution.

 

            Thyristors and triacs are switched on by using a gate. They automatically switch off again when the conducted current reaches zero.

            Therefore, these devices can be used in power regulators and by switching at a predetermined position on the AC sine wave (the phase-angle) the effective voltage can be reduced or increased. This can be used to regulate voltage or power to a load.

In our project we provide the load with a constant voltage of 240 V ac., in spite of any variation in the input voltage. The voltage regulation is achieved by controlling the firing angle of the SCR so precisely that the load receives a constant supply. The voltage across the load is stepped down and provided to ADC. ADC will produce a digital signal corresponding to the input analog signal. This digital signal from ADC is then processed by the controller and generates a firing pulse for SCR, hence controlling the load current.

AIM & OBJECTIVE

CIRCIUT DIAGRAM

 

Three Phase Voltage Regulation using SCR and Micro-Controller

 

 

AIM:-
         
          To develop a system for controlling fluctuation in the three phase Voltage supply using SCR and Controller.

OBJECTIVE:-
           
            To upgrade the existing three phase analog regulatory system, to a three phase, microcontroller based SCR drive system. So that if any fluctuation comes in three phase voltage supply, controller will Sense that fluctuation and accordingly give triggering pulses to the SCR to get controlled regulated output at the load.     

PROJECT PLANNING

 

Exactly what was planned in the project?

  •  To design hardware for voltage regulation by using SCR bridge
  •  To sense fluctuation in the single phase voltage supply.
  •  To sense zero crossing of the input sine wave.
  •  To get correct firing angle of SCR for getting correct control voltage.
  •  To calculate the correct delay time for giving trigger pulse to SCR.
  •  To trigger SCR depending upon calculated data and get the regulated       

    output.

  •   To implement the same for three phase voltage supply.

 

 What is achieved?

  •  We designed hardware for voltage regulation by using SCR bridge
  •  We sensed fluctuation in the single phase voltage supply.
  •  We sensed zero crossing of the input sine wave.
  •  We got correct firing angle of SCR for getting correct control voltage.
  •  We calculated the correct delay time for giving trigger pulse to SCR.

           

RESULT AND DISCUSSION

 

            Here by we have designed a device that is capable of detecting the fluctuations in the input mains supply.
            We designed hardware for voltage regulation by using SCR Bridge, which senses fluctuations in the single phase voltage supply across the load and nullifies it.
            Hence our device is capable of regulating the single phase mains supply to a constant dc supply across the load, irrespective of any changes in the supply, hence providing protection to the load device from getting damaged due to sudden variations in the mains.

 

 

 

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