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.
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