Hierarchical distributed model scheme implementation in DC μ grid for numerous ground faults condition

Abstract

This article presents a new protection scheme for the µgrid structure is implemented on low voltage side as DC system’s protection methods are quite new when compared to the AC systems. The protection system designed in AC system faces many difficulties like frequency matching, reactive power violation, and instability. The main objective of the proposed system is to eliminate the faulty segment promptly while keeping the healthy segments functioning unaltered. In the proposed method, a unitwise controller is designed and is connected in feedback so as to maintain stability under all conditions. The unitwise controller comprises primary and secondary controllers which continually monitor all the units of DC grid comprising semiconductor bidirectional switches and snubber circuits. A primary controller is used for monitoring the complete variation in the parameters in all the units. If the observed parameter value is greater than the acceptable range, the secondary controllers receive the command so as to take the required action to eliminate the faulty segment. Both lines and ground faults are tested on all the sections separately and also simultaneously. The tested results are analyzed in all aspects and the results of the states that the designed protection scheme competent in isolating the defective segment within a short period of time. Once the defective segment is isolated, the other segments retain the stabilized voltage and current limits. The protection scheme is designed and verified using MATLAB/Simulink.

Keywords

Low voltage DC systems µgrid bidirectional switches primary and secondary controller

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References

, et al. Managing wind power uncertainty through strategic reserve purchasing. IEEE Trans Power Syst 2017; 32: 2547–2559.

Zhang

, et al. A convex model of risk-based unit commitment for day-ahead market clearing considering wind power uncertainty. IEEE Trans Power Syst 2015; 30: 1582–1592.

Feng

Zhang

, et al. Cost reduction of a hybrid energy storage system considering correlation between wind and PV power. Protect Control Mod Power Syst 2016; 1: 11.

Bach

PF.

Towards 50% wind electricity in Denmark: dilemmas and challenges. Eur Phys J Plus 2016; 131: 1–12.

Wang

Gao

Bertling

Operational adequacy studies of power systems with wind farms and energy storages. IEEE Trans Power Syst 2012; 27: 2377–2384.

Wang

Zhang

Chen

, et al. Dependent discrete convolution based probabilistic load flow for the active distribution system. IEEE Trans Sustain Energy 2017; 8: 1000–1009.

Teng

Aunedi

Strbac

Benefits of flexibility from smart electrified transportation and heating in the future UK electricity system. Appl Energy 2016; 167: 420–431.

Jin

Golari

Fan

Multi-period production-inventory decision under integration of renewable energy sources. In: IIE annual conference proceedings, 2015, p. 75300. Peachtree Corners, GA: Institute of Industrial and Systems Engineers (IISE).

Zeng

Chen

Blaabjerg

Design and comparison of full-size converters for large variable-speed wind turbines. In: 2007 European conference on power electronics and applications, Aalborg, Denmark, 2-5 September 2007, pp. 1–10. New York: IEEE.

10.

Dvorkin

Ortega-Vazuqez

Kirschen

DS.

Wind generation as a reserve provider. IET Gener Transm Dis 2015; 9: 779–787.

11.

Cardell

Anderson

CL.

A flexible dispatch margin for wind integration. IEEE Trans Power Syst 2015; 30: 1501–1510.

12.

Zhang

Z-S

Sun

Y-Z

Cheng

Potential of trading wind power as regulation services in the California short-term electricity market. Energy Policy 2013; 59: 885–897.

13.

Hedayati-Mehdiabadi

Zhang

Hedman

KW.

Wind power dispatch margin for flexible energy and reserve scheduling with increased wind generation. IEEE Trans Sustain Energy 2015; 6: 1543–1552.

14.

Ela

Kirby

Navid

, et al. Effective ancillary services market designs on high wind power penetration systems. In: Power and energy society general meeting, 2012, pp. 1–8. New York: IEEE.