DC micro grids and distribution systems: An overview

GUIDED BY, PRESENTED BY, Mrs. Chithra S.R, Mr. Abhinandh B.G ASST.PROFESSOR E13U002 (DEPT. OF EEE) MESITAM

INTRODUCTION

•War of Currents

N.Tesla Thomas Edison

MOTIVATION FOR DC SYSTEMS RECONSIDERATION

•DC Loads•Renewable energy sources •Storage•Data Centers•Electric Vehicles •DC Micro grids

DC MICROGRIDS

•Renewable energy sources and storage systems•Islanded mode of operation

FEASIBILITY OF DC DISTRIBUTION SYSTEM

•Efficiency •Conversion Losses•Resistance of the circuit

DESIGN OF DC DISTRIBUTION SYSTEMS

•Steady state modeling •Configurations of dc micro grid for data centers

(a) (b)

PROTECTION OF DC DISTRIBUTION SYSTEMS

•3 phase ac circuit breakers in series

•Ultra fast hybrid dc circuit breakers

•Economic handshaking method

DC MICROGRID STANDARDS

• The EMerge Alliance Data/Telecom

Center Standard-380V DC

•Military standard (MIL-STD-1399)

EXISTING DC DISTRIBUTION SYSTEMS

•Space Craft systems NASA international space station

•Data centers Prineville Data Center, Oregon•Telecommunications Nippon Telegraph and Telephone ,Japan •Ship Board Power Systems

ADVANTAGES OF DC DISTRIBUTION SYSTEMS

•No Inductance ,Capacitance and surge •No Skin Effect •Reduced Interference with communications •No stability problem and synchronising difficulties •Only Two Conductors are required

CONCLUSION

REFERENCES

[1] DC micro grids and distribution systems: An overview Ahmed T.Elsayed, Ahmed A. Mohamed, Osama A. Mohammed Year: 2013Pages: 1 - 5.[2] S.-H. Ryu, J.-H. Ahn, B.-K. Lee, K.-S. Cho, Single-switch ZVZCS quasi-resonant CLL isolated DC–DC converter for low-power 32 LCD TV, in: IEEE Energy Conversion Congress and Exhibition (ECCE), 2013, pp. 4887–4893.[3] C.-H. Tsai, Y.-W. Bai, M.-B. Lin, R.J.R. Jhang, C.-Y. Chung, Reduce the stand by power consumption of a microwave oven, IEEE Trans. Consum. Electron. 59(2013) 54–61.[4] D. Salomonsson, A. Sannino, Load modeling for steady-state and transient analysis of low-voltage DC systems, IET Electr. Power Appl. 1 (2007) 690–696.[5] M. Amin, Y. Arafat, S. Lundberg, S. Mangold, Low voltage DC distribution system compared with 230 V AC, in: IEEE Electrical Power and Energy Conference(EPEC), 2011, pp. 340–345.

THANK YOU “I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that.”

- Edison