Presented

By

Tashif Alam

SCHOOL OF ELECTRICAL ENGINEERINGKIIT UNIVERSITY

OUTLINE

2

1. Introduction

2.Single phase grid-integrated PWM-VSI

3.Hysteresis current controller (HCC)

4.Hysteresis current controller with offset

5.Simulation result and discussion

6.Conclusion

7.Reference

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• PWM-VSI are widely used because of its harmonic elimination

capacity

• HCC is preferred owing to its good current tarcking ability,

unconditional stability and quick current controllability

• HCC for single phase grid connected PWM-VSI has been

implemented by introducing an extra offset hysteresis band.

• The switching stress is reduced as this method.

3

INTRODUCTION

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4

SINGLE PHASE PWM-VSI

Block diagram of PWM-VSI

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5

REFERENCE CURRENT

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where ( )

6

OVERALL BLOCK DIAGRAM

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7

HYSTERESIS CURRENT CONTROLLER(HCC)

• HCC operates by comparing the error current with a fixed hysteresis band

• HCC is superior owing to its high

stability, higher accuracy. HCC Technique

Switiching logic of HCC

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8

HCC WITH OFFSET TECHNIQUE

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9

HCC WITH OFFSET TECHNIQUE

Hcc with offset, Positive Inverter output Hcc with offset, Negative Inverter output

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DC link voltage & utility grid voltage Grid voltage & output current

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Simultation Result

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Result of actual current, reference current of HCC

Result of actual current, reference current of HCC with offset

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Simultation Result

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Result of actual current, reference current of HCC for 1-cycle

Result of actual current, reference current of HCC with offset

for 1-cycle

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Simultation Result

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Result of current error of HCC Result of current error of HCCwith offset

13

Simultation Result

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THD of actual current of HCC

Result of switching frequency of HCC with offset

14

Simultation Result

Result of switching frequency of HCC

THD of actual current of HCC with offset

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CONCLUSION

The HCC with offset scheme is implemented to achieve lower switiching . Another advantages is, average value of the current error is smaller as

compared to HCC

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REFERENCES

[1] Falk, H., "Prolog to renewable energy today and tomorrow," in Proceedings of the IEEE , vol.89, no.8, pp.1214-1215, Aug. 2001.

[2] Kroposki, B.; Pink, C.; DeBlasio, R.; Thomas, H.; Simões, M.; Sen, P.K., "Benefits of Power Electronic Interfaces for Distributed Energy Systems," IEEE Transactions on Energy Conversion, , vol.25, no.3, pp.901-908, Sept. 2010.

[3] Bose, B.K., "Global Energy Scenario and Impact of Power Electronics in 21st Century," IEEE Transactions on Industrial Electronics, , vol.60, no.7, pp.2638-2651, July 2013.

[4] D. G. Holmes, T. A. Lipo, B. P. McGrath, and W. Y. Kong, “Optimised design of stationary frame three phase AC current regulators,” IEEE Trans. Power Electron., vol. 24, no. 11, pp. 2417–2426, Nov. 2009.

[5] Timbus, A.; Liserre, M.; Teodorescu, R.; Rodriguez, P.; Blaabjerg, F., "Evaluation of Current Controllers for Distributed Power Generation Systems IEEE Transactions on in Power Electronics, , vol.24, no.3, pp.654-664, March 2009.

[6] Huifeng Mao; Xu Yang; Zenglu Chen; Zhaoan Wang, "A Hysteresis Current Controller for Single-Phase Three-Level Voltage Source Inverters," IEEE Transactions on Power Electronics, , vol.27, no.7, pp.3330-3339, July 2012.

[7] D. Torrey and A. Al-Zamel, "Single-phase active power filters for multiple nonlinear loads," IEEE Transactions on Power Electronics, vol. 10, no. 3, pp. 263-272, May 1995.

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THANK YOU FOR ATTENTION

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