ABSTRACT:
Vienna rectifiers have gained popularity in recent years for AC to DC power conversion for many industrial applications such as welding power supplies, data centers, telecommunication power sources, aircraft systems, and electric vehicle charging stations. The advantages of this converter are low total harmonic distortion (THD), high power density, and high efficiency. Due to the inherent current control loop in the voltage-oriented control strategy proposed in this paper, good steady-state performance and fast transient response can be ensured. The proposed voltage-oriented control of the Vienna rectifier with a PI controller (VOC-VR) has been simulated using MATLAB/Simulink. The simulations indicate that the input current THD of the proposed VOC-VR system was below 3.27% for 650V and 90A output, which is less than 5% to satisfy the IEEE-519 standard. Experimental results from a scaled-down prototype showed that the THD remains below 5% for a wide range of input voltage, output voltage, and loading conditions (up to 2 kW). The results prove that the proposed rectifier system can be applied for high power applications such as DC fast-charging stations and welding power sources.
KEYWORDS:
1. Front-end
converters
2. High
power applications
3. Power
factor
4. Total
harmonic distortion
5. Vienna
rectifier
6. Voltage
oriented controller
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Figure 1. The Proposed Electric Vehicle Charger Is
Based On Vienna Rectifier With A Voc Controller (Voc-Vr) System.
EXPECTED SIMULATION RESULTS:
Figure 2. Input Current Waveform Of The Proposed
Voc-Vr System With 440 V Rms In And 650 V Dc Out.
Figure 3. Total Harmonic Distortion Of The
Proposed Voc-Vr System With 440 V Rms In And 650 V Dc Out.
Figure 4. Dc Output Voltage And Output Current Of
The Vienna Rectifier With Voc Controller With 350 V Ac Rms Input And 650 V Dc
Output Voltage.
Figure 5. Dc Output Voltage And Output Current Of
The Vienna Rectifier
With
Voc Controller With 350 V Ac Rms Input And 220 V Dc Output Voltage For Slow
Charging Stations.
CONCLUSION:
In
this research work, a three-level Vienna rectifier based on a voltage-oriented
controller (VOC-VR) has been designed and experimentally tested. The proposed
system has been simulated using MATLAB Simulink software targeting high power applications
such as DC-fast chargers for electric vehicles. The proposed controller for
Vienna rectifier focused on combining voltage-oriented controllers with the PWM
method. In proposed design, the reactive and unstable active currents are
counteracted by the input and output filters and Voltage Oriented Controller
(VOC) with Vienna rectifier. The proposed design also guarantees a sinusoidal
current at the input side with minimum ripples and distortions. The system's power
factor is maintained at unity, and total harmonic distortion of the input
current is kept less than 5 %, which meets the IEEE-519 standard. The benefit
of the proposed controller over conventional PFC controller has been
demonstrated by simulations and experimental results. Low THD, good power
factor, and smaller filtering requirements make the voltage-oriented controller-based
Vienna rectifier an ideal candidate in electric vehicle charging stations.
REFERENCES:
[1]
F. Nejabatkhah, Y. W. Li, and H. Tian, ``Power quality control of smart hybrid
AC/DC microgrids: An overview,'' IEEE Access, vol. 7, pp. 52295_52318,
2019.
[2]
P. Arboleya, G. Diaz, and M. Coto, ``Unified AC/DC power flow for traction
systems:Anewconcept,'' IEEE Trans. Veh. Technol., vol. 61, no. 6, pp.
2421_2430, Jul. 2012.
[3]
W. Su, H. Eichi,W. Zeng, and M.-Y. Chow, ``A survey on the electrification of
transportation in a smart grid environment,'' IEEE Trans. Ind. Informat.,
vol. 8, no. 1, pp. 1_10, Feb. 2012.
[4]
I. Pavi¢, T. Capuder, and I. Kuzle, ``Value of flexible electric vehicles in providing
spinning reserve services,'' Appl. Energy, vol. 157, pp. 60_74, Nov.
2015.
[5]
L. Hang, H. Zhang, S. Liu, X. Xie, C. Zhao, and S. Liu, ``A novel control
strategy based on natural frame for Vienna-type rectifier under light unbalanced-grid
conditions,'' IEEE Trans. Ind. Electron., vol. 62, no. 3, pp. 1353_1362,
Mar. 2015.
