ABSTRACT:
High
gain DC-DC converters are increasingly being used in solar PV and other
renewable generation systems. Satisfactory steady-state and dynamic performance,
along with higher efficiency, is a pre-requirement for selecting the converter
for these applications. In this paper, a non-inverting high gain DC-DC boost
converter has been proposed. The proposed converter has only one switch with
continuous input current and reduced voltage stress across switching devices.
The operating range of the duty cycle is wider, and it obtains a higher gain at
a lower value of the duty cycle. Moreover, the converter has higher efficiency
at a lower duty cycle while drawing a continuous input current. The continuous
input current is a desirable feature of the dc-dc converter making it suitable
for solar photovoltaic applications. The converter's operation has been
discussed in detail and extended to include the real circuit parameters for a
practical performance evaluation. The proposed converter has been compared with
other similar recently proposed converters on various performance parameters.
The loss analysis for the proposed converter has also been carried out.
Finally, the simulation has been validated with results from the experimental
prototype.
KEYWORDS:
1. Continuous
conduction mode
2. Duty
cycle
3. High
gain
4. DC-DC
boost converter
5. Voltage
stress
SOFTWARE: MATLAB/SIMULINK
SCHEMATIC DIAGRAM:
Figure 1. (A) Conventional Quadratic Boost
Converter (Cqbc) (B) Proposed Converter In [26] (C) Proposed Converter.
EXPECTED SIMULATION RESULTS:
Figure 2. Simulated Waveforms Of Il1 And Il2 And
Vgs1 At D D 0.3.
Figure 3. Simulated Waveforms Of V0 And Vin At D D
0.3 With Vgs1.
Figure 4. Simulated Waveforms Of Input Current Iin
At D D 0.3.
Figure 5. Simulated Waveforms Of Vc1, Vc3 And Vc4
At D D 0.3.
Figure 6. Simulated Waveforms Of Vd5, Vs1 And Vgs1
At D D 0.3.
CONCLUSION:
A new non-inverting DC-DC boost converter is
proposed in this paper. The proposed converter has high gain and utilizes only
one switch to operate the converter, and therefore, control is easy. The
voltage stress on the switch and diodes is low, and therefore low voltage-rated
switch can be chosen which increases the efficiency and reduces the cost. The
converter has draws continuous input current and thus the need for an input filter
does not arise. Hence, it can be used in microgrid applications as the voltage
of the converter at a low duty ratio is high compared to the conventional boost
converter and other high gain converters. To verify the analysis practically, a
200W hardware prototype has been prepared for the converter. The peak of the
efficiency of the proposed converter is observed to be greater than 95% but the
efficiency decreases at high output power on account of losses. Thus, the
proposed converter is suitable for medium power range suitably up to 300W. The
merits of the converter make it suitable to be used in solar PV applications,
automobiles, fuel cells and electric vehicles.
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