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Three-Phase AC-DC-AC PWM Converter

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20 Dec 2011 (Updated )

SimPowerSystems model of a three-phase PWM VSC-based power supply.

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Description

A 50 kW, 380 V, 50 Hz load is connected to a 25 kV, 60 Hz grid through a AC-DC-AC power supply. This power supply consists of two voltage source converters, VSC1 and VSC2, connected through a DC link.

VSC1 connected on 60Hz grid is operating as a rectifier. It regulates the DC link voltage at 680 V and keeps unity power factor on AC grid. The PWM chopping frequency is 1980 Hz.

VSC2 connected on 50 Hz load is operating as an inverter. It generates a 50 Hz frequency and regulates load voltage at 380 Vrms. The PWM chopping frequency is 2000 Hz.

The electrical circuit is discretized at 2 microseconds. The sampling time of the VSC1 and VSC2 control systems is 100 microseconds.

Authors: Gilbert Sybille & Pierre Giroux, Hydro-Québec (IREQ)

Required Products SimPowerSystems
Simulink
MATLAB release MATLAB 7.13 (R2011b)
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Comments and Ratings (16)
07 Jun 2014 Asad Waqar

Hi,
Why reference dc voltage is divided by 2 in the Uabc_ref Generation block.

07 Jun 2014 Asad Waqar

Could somebody tell about the IEEE reference paper about this model?

21 May 2014 ddragonss  
22 Mar 2014 smile mark

good ,thanks!!!i don't know how to set the Kp and Ki

23 Feb 2014 nripendra

Sir, can u tell me some ieee reference papers regarding this model.

07 Jun 2013 zwbscg  
05 Apr 2013 mehrdad  
19 Feb 2013 Ali

Hi Patrice,
Would you please explain how to design the output LC filter? Do you have any good reference for it?
Bests,
Ali

19 Dec 2012 BALA KRISHNA

Hi Patrice
can u pls tell me how to find the rating of filter.

09 Sep 2012 cr28

is it possible to stick s battery in there (between the two units) and make it act as a grid energy storage unit?

13 Jul 2012 zoheir tir

thank you Patrice Brunelle

01 Jul 2012 Arjun

Hi Patrice,
I am working on a simulink model for a single phase inverter. I am struggling with gate control for the inverter to maintain 120V rms ac output.
Can you please provide me some references for the inverter control for single phase.
Thanks
AG

22 Jun 2012 Hasmina

Thanks Patrice and the authors: Gilbert Sybille & Pierre Giroux, Hydro-Québec (IREQ)...

03 May 2012 Patrice Brunelle

Hi Manu,

Please note that the DC link capacitance is C= 1500e-6 F (not 75 000e-6 F as stated in my previous response).
Calculation of the Wc/Pnom ratio is correct.

26 Apr 2012 Patrice Brunelle

Hi Manu,
The size of the DC link capacitor of a VSC converter is determined by the Wc/Pnom ratio where Wc = energy stored in the capacitor bank at nominal DC link voltage (Joules) and Pnom = nominal power of the converter. This ratio is usually a fraction of a cycle, typically between 0.25 cycle and 0.75 cycle.

In our demo, C=75 000e-6 F, Vc=750 V, Pnom=50 kW

Wc/Pnom= 0.5*1500e-6*750^2 / 50e3= 0.0084 sec = ½ cycle for 60 Hz frequency

Please note that this ratio is given in the model (see comments in blue) .

In other words, it means that, with the energy stored in the capacitor, the inverter could theoretically deliver nominal power to the load during 8. 4 ms when the inverter is disconnected from the rectifier.

23 Apr 2012 Manu Jain

Hi Patrice,
Can you please tell me how to size the dc-link capacitor or how to find the uF value of dc-link capacitor for such a rectifier-inverter system? If possible, let me know the reference IEEE paper or book or datasheet to calculate capacitor value.

Updates
20 Dec 2011

I added a preview image of the model.

25 Sep 2012

Fixed VSC2 control: Uref and modulation index now computed as in VSC1 Control.
Transformer voltage ratio, DC bus voltage and size of capacitor bank have been changed so that modulation indexes of VSC1 and VSC2 stay close to 1.

28 Sep 2012

Fixed a comment in the model.

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