[SOLVED] How to set Vpulse for Single Phase Controlled Rectifier by using pspice

Status
Not open for further replies.
A

Arif Syazwan

Newbie level 6
Joined
Nov 16, 2013
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
80
Im trying to do a simulation for Single Phase Controlled by using pspice. But i have some problem on Vpulse, my simulation not same with the theory.

Here is my circuit



Vm = 339.4 V
Average Voltage Output = 203
Freq = 50Hz
Firing angle is = 30 degree

What to set for Vpulse?
 

Hi,

please post a scope picture of the voltage across R1.

Maybe you see what happens on this picture.

***
You using a voltage measurement across R1.
What does it show?
* Average voltage?
* RMS voltage?
* actual voltage?

Klaus
 

Hi KlausST,

Here are the result for the simulation across R1


it suppose to show the peak voltage..
I dont know whether i set the vpulse right or wrong..
 

Hi,

Now you see what happens.

Your phase control is not correct. It´s obvious, because positive and negative halfwave is not symmetrical. And it should stop at exactely zero cross.

***
Calculation. See the waveform from 10ms to 20ms.
Ignore the negative going cycle at the beginning.
The rising edge is at about 6.7ms
and it is conductive for about 5ms.

calculations:
One halfwave is at 50 Hz is 10ms = 180°.
For 30° conductivity you need a delay from zerocross of 180° - 30° = 150°
150° in time is: 10ms * 150° / 180° = 8.33 ms (delay from zero cross)
conductivity time (30°) = 10ms * 30° / 180° = 1.67ms.

conclusion:
Your delay is 6.7ms, but it should be 8.33ms
and your ON time is 5ms, but it should be 1.67ms.

Klaus
 

Thanks for reply Klaus
Sorry to ask more...can u specific which one should i change

For S2
V1 = 0
V2 = 5
TD = 1.67m
TR = 1n
TF = 1n
PW = 8.33m
PER = 20m

For S1
V1 = 0
V2 = 5
TD = 1.67m
TR = 1n
TF = 1n
PW = 8.33m
PER = 20m

im a bit confusing about set the Vpulse

 

Do you know what each parameter of "VPULSE" mean ?
 

Yes i know
PER = Period
PW = Pulse Width
TR= Time rise
TF = Time Fall
TD = Time delay
 

Hi,

Sorry to ask more...can u specific which one should i change
Click to expand...
I don't want to do your job, but I want to help you to find the solution to your own.

So just disable S2 by setting V1 = V2 = 0, the rest is not important.

Then just play around with S1: Td, Pw

For S2
V1 = 0
V2 = 0
.
.
.

For S1
V1 = 0
V2 = 5
TD = 1.67m
TR = 1n
TF = 1n
PW = 8.33m
PER = 20m

After you found the solution for S1, then find the solution for S2.

Klaus
 
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…