A Multifunctional Non-Isolated Dual Input-Dual Output Converter for Electric Vehicle Applications Final Year Academic Electrical Projects

ABSTRACT:

High voltage conversion dc/dc converters have perceived in various power electronics applications in recent times. In particular, the multi-port converter structures are the key solution in DC microgrid and electric vehicle applications. This paper focuses on a modified structure of non-isolated four-port (two input and two output ports) power electronic interfaces that can be utilized in electric vehicle (EV) applications. The main feature of this converter is its ability to accommodate energy resources with different voltage and current characteristics. The suggested topology can provide a buck and boost output simultaneously during its course of operation. The proposed four-port converter (FPC) is realized with reduced component count and simplified control strategy which makes the converter more reliable and cost-effective. Besides, this converter exhibits bidirectional power flow functionality making it suitable for charging the battery during regenerative braking of an electric vehicle. The steady-state and dynamic behavior of the converter are analyzed and a control scheme is presented to regulate the power flow between the diversified energy supplies. A small-signal model is extracted to design the proposed converter. The validity of the converter design and its performance behavior is verified using MATLAB simulation and experimental results under various operating states.

KEYWORDS:

  1. Multi-port converter
  2. Electric vehicle
  3. Bidirectional dc/dc converter
  4.  Battery storage
  5. Regenerative charging

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Figure 1. Block Diagram Of (A) Conventional Converter (B) Proposed Integrated Four-Port Converter (Fpc) Interface In An Electric Vehicle System.

EXPECTED SIMULATION RESULTS:

Figure 2. Experimental Results Of All The States: (I) State 1, (Ii) State 2, (Iii) State 3, (Iv) State 4, & (V) State 5.

Figure 2. (Continued.) Experimental Results Of All The States: (I) State 1, (Ii) State 2, (Iii) State 3, (Iv) State 4, & (V) State 5.

Figure 2. (Continued.) Experimental Results Of All The States: (I) State 1, (Ii) State 2, (Iii) State 3, (Iv) State 4, & (V) State 5.

Figure 3. Experimental Results With Change In Input Voltage Change In Duty Cycle And Load: (I) Change In Pv Voltage, Constant Battery Voltage, And Constant Duty Cycle, (Ii) Vo And Vo1, (Iii) Change Constant Duty Cycle, When Constant Pv Voltage And Battery Voltage, (Iv) Output Load Voltages.

Figure 3. (Continued.) Experimental Results With Change In Input Voltage Change In Duty Cycle And Load: (I) Change In Pv Voltage, Constant Battery Voltage, And Constant Duty Cycle, (Ii) Vo And Vo1, (Iii) Change Constant Duty Cycle, When Constant Pv Voltage And Battery Voltage, (Iv) Output Load Voltages.

CONCLUSION:

A single-stage four-port (FPC) buck-boost converter for hybridizing diversified energy resources for EV has been proposed in this paper. Compared to the existing buck-boost converter topologies in the literature, this converter has the advantages of a) producing buck, boost, buck-boost output even without the use of an additional transformer b) having bidirectional power flow capability with reduced component count c) handling multiple resources of different voltage and current capacity. Mathematical analysis has been carried out to illustrate the functionalities of the proposed converter. A simple control algorithm has been adopted to budget the power flow between the input sources. Finally, the operation of this converter has been verified through a low voltage prototype model. Experimental results validate the feasibility  of the proposed four-port buck-boost topology.

REFERENCES:

[1] H. Wu, Y. Xing, Y. Xia, and K. Sun, “A family of non-isolated three-port converters for stand-alone renewable power system,” IEEE Trans. Power Electron., vol. 1, no. 11, pp. 1030_1035, 2011.

[2] K. I. Hwu, K.W. Huang, and W. C. Tu, “Step-up converter combining KY and buck-boost converters,” Electron. Lett., vol. 47, no. 12, pp. 722_724, Jun. 2011.

[3] H. Xiao and S. Xie, “Interleaving double-switch buck_boost converter,” IET Power Electron., vol. 5, no. 6, pp. 899_908, Jul. 2012.

[4] H. Kang and H. Cha, “A new nonisolated High-Voltage-Gain boost converter with inherent output voltage balancing,” IEEE Trans. Ind. Electron., vol. 65, no. 3, pp. 2189_2198, Mar. 2018.

[5] T. Bang and J.-W. Park, “Development of a ZVT-PWM buck cascaded buck_boost PFC converter of 2 kW with the widest range of input voltage,” IEEE Trans. Ind. Electron., vol. 65, no. 3, pp. 2090_2099, Mar. 2018.

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