Analysis and Implementation of a Novel Bidirectional DC–DC Converter

ABSTRACT:  

A novel bidirectional dc–dc converter is presented in this paper and its circuit configuration of the proposed converter is very simple. The proposed converter employs a coupled induct-or with same winding turns in the primary and secondary sides. In step-up mode, the primary and secondary winding s of the coupled induct-or are operated in parallel charge and series discharge to achieve high step-up voltage gain. In step-down mode, the primary and secondary winding s of the coupled induct-or are operated in series charge and parallel discharge to achieve high step-down voltage gain.

Proposed converter

Thus, the proposed converter has higher step-up and step-down voltage gains than the conventional bidirectional dc–dc boost/buck converter. Under same electric specifications for the proposed converter and the conventional bidirectional boost/buck converter, the average value of the switch current in the proposed converter is less than the conventional bidirectional boost/buck converter. The operating principle and steady-state analysis are discussed in detail. Finally, a 14/42-V prototype circuit is implemented to verify the performance for the automobile dual-battery system.

KEYWORDS:
  1. Bidirectional dc–dc converter
  2. Coupled induct-or
 SOFTWARE: MAT LAB/SIMULATION
 CIRCUIT DIAGRAM:

 

Fig. 1. Proposed bidirectional dc–dc converter.

 EXPECTED SIMULATION RESULTS:

 

 Fig. 2. Some experimental wave-forms of the proposed converter in step-up mode. (a) iL1, iL2, and iL, (b) iS1, iS2, and iS3. (c) vDS1, vDS2, and vDS3.

 

 Fig. 3. Dynamic response of the proposed converter in step-up mode for the output power variation between 20 and 200 W.

Fig. 4. Some experimental wave-forms of the proposed converter in step down mode. (a) iLL, iL1, and iL2, (b) iS3, iS1, and iS2. (c) vDS3, vDS1, and vDS2.

Fig. 5. Dynamic response of the proposed converter in step-down mode for the output power variation between 20 and 200 W.

CONCLUSION:

 This paper researches a novel bidirectional dc–dc converter. The circuit configuration of the proposed converter is very simple. The proposed converter has higher step-up and step-down voltage gains and lower average value of the switch current than the conventional bidirectional boost/buck converter. From the experimental results, it is see that the experimental wave-forms agree with the operating principle and steady-state analysis. At full-load condition, the measured efficiency is 92.7% in step-up mode and is 93.7% in step-down mode. Also, the measured efficiency is around 92.7%–96.2% in step-up mode and is around 93.7%–96.7% in step-down mode, which are higher than the conventional bidirectional boost/buck converter.

REFERENCES:

[1] M. B. Cam a r a, H. G u a lo us, F. Gust in, A. Berth on, and B. D a k yo, “DC/DC converter design for super capacitor and battery power management in hybrid vehicle applications—Polynomial control strategy,” IEEE Trans. Ind. Electron., vol. 57, no. 2, pp. 587–597, Feb. 2010.

[2] T. B h at t a char ya, V. S. G i r i, K. Mathew, and L. U man and, “Multi phase bidirectional fly back converter topology for hybrid electric vehicles,” IEEE Trans. Ind. Electron., vol. 56, no. 1, pp. 78–84, Jan. 2009.

[3] Z. Am j ad i and S. S. Williamson, “A novel control technique for a switched-capacitor-converter-based hybrid electric vehicle energy storage system,” IEEE Trans. Ind. Electron., vol. 57, no. 3, pp. 926–934, Mar. 2010.

[4] F. Z. Pen g, F. Zhang, and Z. Q i an, “A magnetic-less dc–dc converter for dual-voltage automotive systems,” IEEE Trans. Ind. App l., vol. 39, no. 2, pp. 511–518, Mar./Apr. 2003.

[5] A. Na sir i, Z. N i e, S. B. Be k i a r o v, and A. E mad i, “An on-line UPS system with power factor correction and electric isolation using BI F RED converter,” IEEE Trans. Ind. Electron., vol. 55, no. 2, pp. 722–730, Feb. 2008.

Dynamic Voltage Restorer Using Switching Cell Structured Multilevel AC-AC Converter

IEEE Transactions on Power Electronics, 2016

ABSTRACT:

Dynamic voltage restorer (DVR) technology has become a mature power quality product. In high-power applications, DVR using a multilevel converter is commonly used. However, DVR using a multilevel direct pulse width modulation (PWM) ac-ac converter has not been well studied. This paper presents a new DVR topology using a cascaded multilevel direct PWM ac-ac converter. In the proposed scheme, the unit cell of the multilevel converter consists of a single-phase PWM ac-ac converter using switching cell (SC) structure with coupled inductors. Therefore, the multilevel converter can be short- and open-circuited without damaging the switching devices. Neither lossy RC snubber nor a dedicated soft commutation strategy is required in the proposed DVR. This improves the reliability of the DVR system. The output voltage levels of the multilevel converter increase with the number of cascaded unit cells, and a high ac output voltage is obtained by using low-voltage-rating switching devices. Furthermore, a phase-shifted PWM technique is applied to significantly reduce the size of the output filter inductor. A 1-kW prototype of single-phase DVR is developed, and its performance is experimentally verified. Finally, the simulation results are shown for a three-phase DVR system.

 

KEYWORDS:

  1. Commutation problem
  2. coupled inductor
  3. direct PWM AC-AC converter
  4. dynamic voltage restorer (DVR)
  5. multilevel converter
  6. pulse width modulation (PWM)
  7. switching cell (SC)

 

SOFTWARE: MATLAB/SIMULINK

 

CIRCUIT DIAGRAM:

Fig. 1. Three-phase DVR systems using VSI [2]. (a) DVR with energy storage. (b) DVR with no energy storage.

 

EXPECTED SIMULATION RESULTS:

 

Fig. 2. Simulated waveforms of the three-phase DVR ( voa=vob=voc=220 Vrms,Po=3kW, )

 

CONCLUSION:

In this paper, a new DVR system, employing the proposed cascaded multilevel direct PWM ac-ac converter, was presented. Compared with the conventional DVR topologies using the VSI, the proposed scheme has the advantages of fewer power stages, higher efficiency, and the elimination of bulky dc-link capacitor. In addition, unlike the existing DVR with the direct PWM ac-ac converter, the proposed DVR ensures stable operation because the proposed cascaded multilevel ac-ac converter has the following unique advantages over the conventional ac-ac converters.

  • It is immune to EMI noise because the switching devices are not damaged by the EMI noise’s misgating on- or off.
  • The commutation problem found in the conventional ac-ac converters can be effectively eliminated without using either dedicated soft commutation strategy or lossy RC snubber circuits.
  • It operates properly even with highly distorted input voltage, which is impossible with the conventional approach using soft commutation strategy.

Furthermore, the proposed multilevel ac-ac converter can obtain high ac output voltage with low-voltage-rating switching devices by cascading unit cells. The equivalent output frequency of the multilevel converter is increased by using a phase-shifted PWM technique, which reduces the size of the output LC filter. The performance of the proposed DVR is successfully verified by using a 1-kW prototype. Finally, a three-phase DVR system using the proposed scheme is verified through simulation.

 

REFERENCES:

  • -H. Kwon, G. Y. Jeong, S.-H. Han, and D. H. Lee, “Novel line conditioner with voltage up/down capability,” IEEE Trans. Ind. Electron., vol. 49, no. 5, pp. 1110–1119, Oct. 2002.
  • Nielsen and F. Blaabjerg, “A detailed comparison of system topologies for dynamic voltage restorers,” IEEE Trans. Ind. Appl., vol. 41, no. 5, pp. 1272–1280, Sep./Oct. 2005.
  • C. Aeoliza, N. P. Enjeti, L. A. Moran, O. C. Montero-Hernandez, and S. Kim, “Analysis and design of a novel voltage sag compensator for critical loads in electrical power distribution systems,” IEEE Trans. Ind. Appl., vol. 39, no. 4, pp. 1143–1150, Jul./Aug. 2003.
  • E. Brumsickle, R. S. Schneider, G. A. Luckjiff, D. M. Divan, and M. F. McGranaghan, “Dynamic sag correctors: Cost-effective industrial power line conditioning,” IEEE Trans. Ind. Appl., vol. 37, no. 1, pp. 212– 217, Jan./Feb. 2001.

A Novel High StepUp DC DC Converter Based on Integrating Coupled Inductor and Switched-Capacitor Techniques for Renewable Energy Applications

ABSTRACT

In this paper, a novel high development up dc/dc converter is shown for maintainable power source applications. The proposed structure involves a coupled inductor and two voltage multiplier cells, in order to get high development up voltage gain. Likewise, two capacitors are charged in the midst of the kill time frame, using the essentialness set away in the coupled inductor which manufactures the voltage trade gain. The essentialness set away in the spillage inductance is reused with the use of a dormant fasten circuit. The voltage load on the basic power switch is furthermore diminished in the proposed topology. Thusly, a key influence switch with low resistance RDS(ON) can be used to diminish the conduction incidents. The action rule and the tireless state examinations are discussed inside and out. To check the execution of the showed converter, a 300-W lab demonstrate circuit is completed. The results affirm the speculative examinations and the practicability of the showed high development up converter.

 CIRCUIT DIAGRAM:

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Fig. 1. Circuit configuration of the presented high-step-up converter.

SIMULATION RESULTS:

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Fig. 2. Simulation results under load 300 W.

 CONCLUSION

This paper demonstrates another high-advance up dc/dc converter for maintainable power source applications. The suggested converter is fitting for DG systems reliant on practical power sources, which require high-advance up voltage trade gain. The essentialness set away in the spillage inductance is reused to upgrade the execution of the showed converter. In addition, voltage load on the essential power switch is diminished. In like manner, a switch with a low on-state obstacle can be picked. The continuing state errand of the converter has been dismembered in detail. Moreover, the limit condition has been procured. Finally, a hardware show is executed which changes over the 40-V input voltage into 400-V yield voltage. The results exhibit the credibility of the presented converter.