Electrical Power : 635587

Question:

Design a PV based DG unit. The rating of your DG unit will be (your group no. X 100kW). You need to submit your matlab files along with a report, which describes your design process in the group test assessment folder.

In your report please indicate individual contribution of each of the members.

You need to show the following in your report:

1. Design of Voltage source converter. Choice of VDC.
2. Design of PV module. You would need to include PV and IV characteristics curves of your PV module.
3. MPPT controller.
4. Design of DC-DC converter. Validation of your designed DC-DC converter.
5. A schematic diagram showing the complete structure of your PV system.

Answer:

Simulation of Voltage source converter in the basis of VDC
In voltage source converter the direct current flows in both ends of the circuit. The simple Dc voltage source converter is designed by using matlab simulink. In matlab simulink,DC voltage source, series RLC branch, IGBT /diode, series RLC branch1,voltage measurement are used for to get the output. In voltage source converter the following values are assumed in the simlulink.
DC voltage source input =70v (assumed)
In series RLC branch the resistance value is=100 ohm
IGBT is a voltage controlled device.IGBT diodes are mainly used as the voltage source converter. In simulink two level voltage source converter are used. In simulink ,it shows interms of four IGBT/Diodes are used.
In voltage source converter of series RLC branch1 the resistance value is 40 ohm is used as the input.
The voltage measurement are mainly used to measure the voltage from the voltage source converter.The scope is mainly used to get the output.By double pressing of scope,the output of voltage will be displayed.Hence the simple DC to dc voltage source converter is designed by using simulink.

Introduction

The voltage source converter is operated at the vector control strategy. It has the ability to operate at both ends. Two type’s converters are there. Line commuted converters and self-commuted converters. The voltage source converter comes under the type of self-commuted converter. Line commuted converters needs more amount of power for some operation, such as inversion and rectification. The communication failure could be done in the line commuted converter. For regular communication, it needs synchronous voltage source. Constant power reversal and Dc voltage is maintained by voltage source converter. Three types of voltage source converters are there.

• two level converter
• Three level converter
• modular multi-level converter

IGBT is used as the voltage source converter.IGBT stands for insulated gate bipolar transistor.it is used in VSC converter. It is a hybrid device. IGBT is a voltage controlled device. It has three terminals gate, source and the collector. IGBT has optimal turn on and turn off time. Parallel operation of IGBT helps in handling higher currents. The IGBT has voltage divider, water-cooled heat sink and anti-parallel diode. The optical interface, surveillance circuits and gate driving circuits.

Simulation of Voltage Source converter in VDC

In the voltage source controller the direct current flows in either dorection.Generally the voltage source converters maintain the constant polarity of DC voltage. The power reversal is also achieved. The simple dc to dc converter is designed by using matlab. In voltage source converter, the dc voltage source is used as the input.

And the series RLC branch is used. IGBT/Diode is used as the voltage controller. And series RLC circuit is used in the load side. In source side of series RLC 100 ohm resistance is given as the input.70A Ideal DC voltage source is used in the source side. In the load side of RLC circuit 40 ohm resistance is used. Then the design of simulation output is shown in below. The output shows in terms of voltage.

Conclusion:

The design of voltage source converter is designed based on vdc.The simulation of dc to dc voltage source converter is done by using matlab Simulink. The output were plotted by using Simulink.

References

Arrillaga, J. (2008). High voltage direct current transmission. London: Institution of Engineering and Technlogy.

Liu, X. and Lindemann, A. (2016). Control of voltage source converter based high voltage direct current transmission systems for grid code compliance. Magdeburg: Otto-von-Guericke-Universität.

Marten, A., Westermann, D., Van Hertem, D. and Hanson, J. (2015). Operation of meshed high voltage direct current (HVDC) overlay grids. Ilmenau: Univ.-Verl. Ilmenau.

Nguyen Mau, C. (2012). Electric power system stability enhancement by voltage source converter based high voltage direct current technology =. Magdeburg: Univ.