Challenge

Project 2

AAswin K15 Sept 2022

AIM:-

Design a DC power supply using PFC circuit for general purpose applications with 350V dc output and load in the range of 0-7A. The supply should meet the harmonic standard limits for input power quality such that current THD limits are satisfied with input power factor >0.97 value. The input side is connected to single phase grid with parameters as 230V, 50Hz.

Design the supply to give following specifications:

Component selection and justification
Passive component designs including filters
Controller design
Simulation results
Validation with the design criterion

Redesign the above power supply with the PWM rectifier. Give the difference in both power supplies in terms of cost, control complexity, degrees of freedom, additional features and efficiency.

PFC circuit:-

PFC techniques are broadly divided into passive (static) PFC, partial-switching PFC, and active(switching) PFC. Passive (static) PFC inserts a reactor in series with a power supply. Depending onthe capacity of the power supply, a large reactor is required. Therefore, passive PFC is commonlyused for low-capacity power supplies

Simulink model

Controller design:-

Calculations:-

Results:-

output voltage

FFT analysis

here input 1 THD is 0%

that is for 50hz the phase angle is 0 degree

`cos(0*pi/180)=1`

power factor =1

which means it is a good circuit,good efficiency

input2

phase angle=-73 deg

therefore

pf=cos(-73.0*pi/180)=0.99

it is good circuit but not best

take 5th harmonic stage the phase angle is 188.1 deg at 250hz frequency

pf=0.99

19th harmonic stage 182.9 degree ,at 950hz

pf=0.99

Design a high-performance high voltage DC power supply for 15 kV dc output and load in the range of 0-10A. The supply should meet the harmonic standard limits for input power quality such that current THD limits are satisfied with input power factor >0.98 value. The input side is connected to three-phase LV grid with parameters as 11kV (line-line), 50Hz.

Design the supply to give following specifications:

Component selection and justification
Passive component designs including filters
Controller design
Simulation results
Validation with the design criterion

SIMULINK MODEL

we knoe here 3 phase line voltage is 11kv (11000v) so we cant give this voltage directly in bridge we need to step down the voltage by using a 3 phase 2 winding transformer

after we need to transfer that voltage in to bridge rectivier dc link capacitor need here 2 capacitor csed

again we need to transfer to a bridge rectifier. now usin thyristor rectifier because opareting high voltage ,and also we need high output voltage

Ac source