first report on protectin issus.pptx

8/12/2019 First Report on Protectin Issus.pptx

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Task 1: Study of protection issues in micro gridsT1.A Literature review

T1.A1: Impact of inverter interfaced PV sources on over current protection ofdistribution network

T1.A2:Adaptive protection using distributed intelligence with / withoutcommunication (local/global data) with standard protocols(IEC61850,TCP/IP)

T1.B. Simulation study

T1.B1. Modeling of distribution network with PV sources and fault analysis studiesT1.B1. Design of decentralized adaptive protectionalgorithm development

T1.C. Hardware implementation and verificationT1.C.1 Implementation of over current relay in FPGAT1.C.2 Integration of decentralized adaptive protection (agent based)


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Responsibility 2014 2015Tasks SubTasks Q3 Q4 Q1 Q2

T1.A

T1.A1

T1.A2

T1.B

T1.B1

T1.B2

T1.CT1.C1

T1.C2

Task 1: Study of protection issues in micro grids


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Literature survey : Requirements of micro grid protectionFault in upstream gridisolate the micro grid from utility gridislanded operationload/gen management for isolated operation (added function /additional requirement)

If fault is in load end/source end isolate the source/load

If fault is in feeder isolate the smallest part

1. Technical report on advanced architectures and control concepts for more microgrids,

www.microgrids.eu


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Literature review : Protection issues with distributed generationThe paper [2] a UK industry view, formulated using the outcomes of

questionnaires, seminars and other academic-industry exchanges carried outunder the auspices of the Department of Trade and Industry (DTI) funded centrefor DG and sustainable electrical energy (CDG&SEE), of the present andanticipated future protection system challenges in active distribution networks.

Protection issues are arranged in the decreasing order of severity

1. Loss Of Mains Detection Currently prevailing practice-ROCOF basedalgorithms

2. Islandingsignificant challenge to protection when islanding permitted3. Protection discrimination issues existing distribution network protection is

affected /compromised by installation of DG4. Varying fault current levelstotally intermittent operating nature

5. Power quality impact on protection relatively less occurred but there arechances

A. Dysko, G.M. Burt, S. Galloway, C. Booth and J.R. McDonald UK distribution system

protection issues, IET Gener. Transm. Distrib., 2007, 1, (4), pp. 679

687


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Literature Review on :Protection discrimination issues

Summary of protection discrimination issues discussed in References 35

A. Blinding of protectionSensitivity issues

B. False tripping and back feeding

C. Fuse saving scheme

D. Mis- coordination of preciously coordinated relays

E. Selectivity issues

[3] A. Girgis and S. Brahma, Effect of Distributed Generation on Protective Device Coordinationin Distribution System, IEEE Large Engineering Systems Conference on Power Engineering,

2001.

[4] J. A. Silva, H. B. Funmilayo and K. L. Butler-Purry, Impact of Distributed Generation on theIEEE 34 Node Radial Test Feeder with Overcurrent Protection, IEEE 39th North AmericanPower Symposium, 2007

[5] M.E. Baran, I El-Markaby, Fault analysis on distribution feeders with distributedgenerators, IEEE Transaction on Power Systems, Vol. 20, Issue 4, pp. 1757-1764, Nov. 2005


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A.Blinding of protection B. False tripping and back feeding C. Fuse saving scheme



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D. Mis- coordination of relays E. Selectivity issues


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Impact of inverter based distributed generation on protection

Fault Current behavior of Inverter Interfaced distributed generation highly

determined by the converter control and protection which is designed andimplemented by manufactures both to protect their equipment and to follow industrystandardsDifferent aspects of IIDGsand how they are affected by various considerations1.Voltage Vs Current control scheme2.Fault current RMS profile

3.Fault current Composition4.Grounding issues5.Sequence currents

[6] Y. Pan, W. Ren, S. Ray, R. Walling and M. Reichard, Impact of Inverter Interfaced Generation

on Overcurrent Protection in Distribution Systems, Power Engineering and Automationconference (PEAM), 2011 IEEE, Wuhan, China.[7] Mozina, C. Impact of green power inverter-based distributed generation on distributionsystems Protective Relay Engineers, 2014 67th Annual Conference for March 31 2014-April 32014


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[8] Mohammed A. Haj-ahmed , Mahesh S. Illindala, The Influence of Inverter-Based DGs andTheir Controllers on Distribution Network Protection IEEE Transactions on Industryapplications , 2013


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Impact of inverter control modes on fault current contribution


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DG under voltage control mode: output voltage (top) and output current (bottom)for a short-circuit fault at t = 0.3 sec


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DG under current control mode: output voltage (top) and output current (bottom)for a short-circuit fault at t = 0.3 sec


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Work to be done

1. Modeling of PV

2. Modeling of inverter based DG

3. Modeling of distribution network and fault studies

Dao Van Tu, Surachai Chaitusaney, Impacts of Inverter-based Distributed Generation

Control Modes on Short-circuit Currents in Distribution Systems 7th IEEE Conference on

Industrial Electronics and Applications (ICIEA) 2012


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Proposed : Decentralized centralized intelligent adaptive protectionAlgorithm development for a decentralized adaptive protection scheme

Topology processor data base of relay hold nearby relays upstream and down streamparent and childThese details can also be communicated to central system to generate the entiredistribution networkfor optimal operation and controlEach relay has unique Id that should help the appropriate taggingCompatiblecommunication protocols/IEC 61850Relay program structure

relay subroutine- protection functionsCoordination subroutine

Topology processorsInitializingWhen new sources added/at the beginning

Adjusting- generation changes /power flow changes /relay status changesFault current calculationestablishing coordination


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FPGA- O/C relay

Coordination andcontrol algorithm

uP based logic

Relay algorithm

CentralDCS

Microgrid

Communicationlines

Proposed Hardware Realization

first report on protectin issus.pptx

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