1-phase rectifier

For the rectifier circuit given below, determine
  1. the average current through the DC source
  2. the average power dissipated in the $20\,\Omega$ resistor
  3. duration for which each diode conducts (in one cycle)
In [1]:
from IPython.display import Image
Image(filename =r'rectifier_1ph_9_fig_1.png', width=450)
Out[1]:
No description has been provided for this image
In [2]:
# run this cell to view the circuit file.
%pycat rectifier_1ph_9_orig.in

We now replace the strings such as \$R with the values of our choice by running the python script given below. It takes an existing circuit file rectifier_1ph_9_orig.in and produces a new circuit file rectifier_1ph_9.in, after replacing \$R (etc) with values of our choice.

In [3]:
import gseim_calc as calc
import numpy as np
import sys

s_R = "20"
s_Vdc = "220"

l = [
  ('$R', s_R),
  ('$Vdc', s_Vdc),
]
calc.replace_strings_1("rectifier_1ph_9_orig.in", "rectifier_1ph_9.in", l)
print('rectifier_1ph_9.in is ready for execution')

rectifier_1ph_9.in is ready for execution
Execute the following cell to run GSEIM on rectifier_1ph_9.in.
In [4]:
import os
import dos_unix
# uncomment for windows:
#dos_unix.d2u("rectifier_1ph_9.in")
os.system('run_gseim rectifier_1ph_9.in')

get_lib_elements: filename gseim_aux/xbe.aux
get_lib_elements: filename gseim_aux/ebe.aux
Circuit: filename = rectifier_1ph_9.in
Circuit: n_xbeu_vr = 0
Circuit: n_ebeu_nd = 5
main: i_solve = 0
main: calling solve_trns
Transient simulation starts...
i=0
i=1000
GSEIM: Program completed.
Out[4]:
0

The circuit file (rectifier_1ph_9.in) is created in the same directory as that used for launching Jupyter notebook. The last step (i.e., running GSEIM on rectifier_1ph_9.in) creates a data file called rectifier_1ph_9.dat in the same directory. We can now use the python code below to compute/plot the various quantities of interest.

In [5]:
import numpy as np
import matplotlib.pyplot as plt 
import gseim_calc as calc
from setsize import set_size

f_hz = 50.0
T = 1.0/f_hz

slv = calc.slv("rectifier_1ph_9.in")

i_slv = 0
i_out = 0
filename = slv.l_filename_all[i_slv][i_out]
print('filename:', filename)
u = np.loadtxt(filename)
t = u[:, 0]

col_ID1   = slv.get_index(i_slv,i_out,"ID1")
col_ID2   = slv.get_index(i_slv,i_out,"ID2")
col_ID3   = slv.get_index(i_slv,i_out,"ID3")
col_ID4   = slv.get_index(i_slv,i_out,"ID4")
col_V_VS1 = slv.get_index(i_slv,i_out,"V_VS1")
col_I_VS1 = slv.get_index(i_slv,i_out,"I_VS1")
col_I_R   = slv.get_index(i_slv,i_out,"I_R")
col_P_R   = slv.get_index(i_slv,i_out,"P_R")

l_I_R = calc.avg_rms_2(t, u[:,col_I_R], 0.0, 2.0*T, 1.0e-5*T)
l_P_R = calc.avg_rms_2(t, u[:,col_P_R], 0.0, 2.0*T, 1.0e-5*T)

t_I_R =  np.array(l_I_R[0])

print('average current through DC source:', "%11.4E"%(l_I_R[1][0]))
print('average power dissipated in R:', "%11.4E"%(l_P_R[1][0]))

# compute durations of diode conduction:

ndiv = 5000

delt_ID1, ID1p = calc.interp_linear_1(t, u[:,col_ID1], ndiv)
delt_ID2, ID2p = calc.interp_linear_1(t, u[:,col_ID2], ndiv)
delt_ID3, ID3p = calc.interp_linear_1(t, u[:,col_ID3], ndiv)
delt_ID4, ID4p = calc.interp_linear_1(t, u[:,col_ID4], ndiv)

n_ID1 = 0
n_ID2 = 0
n_ID3 = 0
n_ID4 = 0

for k in range(ndiv):
    if (ID1p[k] > 0): n_ID1 += 1
    if (ID2p[k] > 0): n_ID2 += 1
    if (ID3p[k] > 0): n_ID3 += 1
    if (ID4p[k] > 0): n_ID4 += 1

print('angle of conduction for D1:', "%6.2f"%(float(n_ID1)*delt_ID1*360.0/(2.0*T)), 'deg.')
print('angle of conduction for D2:', "%6.2f"%(float(n_ID1)*delt_ID2*360.0/(2.0*T)), 'deg.')
print('angle of conduction for D3:', "%6.2f"%(float(n_ID1)*delt_ID3*360.0/(2.0*T)), 'deg.')
print('angle of conduction for D4:', "%6.2f"%(float(n_ID1)*delt_ID4*360.0/(2.0*T)), 'deg.')

color1 = 'blue'
color2 = 'green'
color3 = 'red'
color4 = 'dodgerblue'
color5 = 'olive'

fig, ax = plt.subplots(4, sharex=False)
plt.subplots_adjust(wspace=0, hspace=0.0)

set_size(5.5, 8, ax[0])

for i in range(4):
    ax[i].set_xlim(left=0.0, right=2.0*T*1e3)
    ax[i].grid(color='#CCCCCC', linestyle='solid', linewidth=0.5)

ax[0].set_ylabel(r'$V_s$'   , fontsize=12)
ax[1].set_ylabel(r'$I_R$'   , fontsize=12)
ax[2].set_ylabel(r'$I_{D1}$', fontsize=12)
ax[3].set_ylabel(r'$I_{D2}$', fontsize=12)

for i in range(3):
    ax[i].tick_params(labelbottom=False)

ax[0].plot(t*1e3,  u[:,col_V_VS1], color=color1, linewidth=1.0, label="$V_{S1}$")
ax[1].plot(t*1e3,  u[:,col_I_R]  , color=color2, linewidth=1.0, label="$I_R$")
ax[2].plot(t*1e3,  u[:,col_ID1]  , color=color3, linewidth=1.0, label="$I_{D1}$")
ax[3].plot(t*1e3,  u[:,col_ID2]  , color=color4, linewidth=1.0, label="$I_{D2}$")

ax[1].plot(t_I_R*1e3, l_I_R[1], color=color2, linewidth=1.0, label="$I_R^{avg}$", linestyle='--', dashes=(5,3))

ax[3].set_xlabel('time (msec)', fontsize=11)

ax[1].legend(loc = 'lower right',frameon = True, fontsize = 10, title = None,
  markerfirst = True, markerscale = 1.0, labelspacing = 0.5, columnspacing = 2.0,
  prop = {'size' : 12},)

#plt.tight_layout()
plt.show()

filename: rectifier_1ph_9.dat
average current through DC source:  1.5008E+00
average power dissipated in R:  1.0887E+02
angle of conduction for D1:  89.86 deg.
angle of conduction for D2:  89.86 deg.
angle of conduction for D3:  89.86 deg.
angle of conduction for D4:  89.86 deg.
No description has been provided for this image

This notebook was contributed by Prof. Nakul Narayanan K, Govt. Engineering College, Thrissur. He may be contacted at nakul@gectcr.ac.in.