High-Gain Single-Stage
Boosting Inverter
for Photovoltaic Applications
ABSTRACT
This paper introduces a high-gain single-stage
boosting inverter (SSBI) for alternative energy generation. As compared to the
traditional two-stage approach, the SSBI has a simpler topology and a lower
component count. One cycle control was employed to generate ac voltage output.
This paper presents theoretical analysis, simulation and experimental results
obtained from a 200 W prototype. The experimental results reveal that the
proposed SSBI can achieve high dc input voltage boosting, good dc–ac power
decoupling, good quality of ac output waveform, and good conversion efficiency.
KEYWORDS
1.
Microinverter
2.
one cycle
control (OCC)
3.
tapped
inductor (TI)
SOFTWARE:
MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig.1. Topology of the proposed SSBI.
EXPECTED SIMULATION RESULTS
Fig. 2. Simulated waveforms of the proposed
SSBI on the line frequency
scale.
Fig.
3. Simulated waveforms of the SSBI’s output voltage Vac , dc-link
voltage
Vdc
, and dc input source current Ig with the TI operating at the CCM–DCM
boundary
(Po = Pob ).
Fig.
4. Simulated waveforms of the SSBI’s output voltage Vac , dc-link
voltage
Vdc
, and dc input source current Ig : (a) illustrating the undistorted
output
voltage
Vac , when SSBI is operated in deep DCM just above the minimum
power
level Po > Pomin and (b) illustrating the peak-shaving distortion of
the
output
voltage Vac for Po < Pomin .
CONCLUSION
A
high-gain SSBI for alternative energy generation applications is presented in
this paper. The proposed topology employs a TI to attain high-input voltage
stepup and, consequently, allows operation from low dc input voltage. This
paper presented principles of operation, theoretical analysis of continuous and
discontinuous modes including gain and voltage and current stresses. To
facilitate this report, two stand-alone prototypes one for 48 V input and
another for 35 V input were built and experimentally tested. Theoretical
findings stand in good agreement with simulation and experimental results.
Acceptable efficiency was attained with low-voltage input source. The proposed
SSBI topology has the advantage of high voltage stepup which can be further
increased adjusting the TI turns ratio. The SSBI allows decoupled control
functions. By adjusting the boost duty cycle Dbst, the SSBI can control
the dc-link voltage, whereas the output waveform can be shaped by varying the
buck duty cycleDbk. The ac–dc power decoupling is attained on the
high-voltage dc link and therefore requires a relatively low capacitance value.
The OCC control method was applied to shape the output voltage. OCC’s fast
response and low sensitivity to dc-bus voltage ripple allowed applying yet
smaller decoupling capacitor value, and has demonstrated low THD output for
different types of highly nonlinear loads.
REFERENCES
[1] S. B. Kjaer, J. K. Pedersen, and F.
Blaabjerg, “A review of singlephase grid-connected inverters for photovoltaic
modules,” IEEE Trans. Ind.
Appl., vol. 41, no. 5, pp.
1292–1306, Sep. 2005.
[2] D. C. Martins and R. Demonti, “Interconnection
of a photovoltaic panels array to a single-phase utility line from a static
conversion system,” in Proc.
IEEE Power Electron. Spec. Conf.,
2000, pp. 1207–1211.
[3] Q. Li and P.Wolfs, “A current fed two-inductor
boost converter with an integrated magnetic structure and passive lossless
snubbers for photovoltaic module integrated converter applications,” IEEE Trans. Power Electron., vol. 22, no. 1, pp. 309–321, Jan. 2007.
[4] S. B. Kjaer, J. K. Pedersen, and F.
Blaabjerg, “Power inverter topologies for photovoltaic modules—A review,” in Proc. Ind. Appl. Conf., 2002, vol. 2, pp. 782–788.
[5] C. Vartak, A. Abramovitz, and K. M.
Smedley, “Analysis and design of energy regenerative snubber for transformer
isolated converters,” IEEE Trans.
Power Electron., vol. 29,
no. 11, pp. 6030–6040, Nov. 2014.
