Self-Healing Distribution System in Smartgrid
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1 Self-Healing Distribution System in Smartgrid Seung-Jae Lee (NPTC) Myongji University, Korea
2 Contents Self-Healing and Distribution Automation System Automatic Fault Isolation and Service Restoration (FISR) Current FISR FISR in Grounded System FISR in Ungrounded System Communication-based FISR Self-healing Grounded System Self-Healing Ungrounded System
3 DAS Distribution Automation System 3
4 DAS
5 DAS Control Center
6 Auto- Sw Comm. RTU
7 Open-Loop Distribution Feeder System 9 10 Feeder : Close state Recloser 14 : Open state Recloser : Close state A/S : Open state A/S
8 Fault 9 10 Feeder : Close state Recloser 14 : Open state Recloser : Close state A/S : Open state A/S
9 Fault and Outage 9 10 Feeder : Close state Recloser 14 : Open state Recloser : Close state A/S : Open state A/S
10 Fault Isolation and Service Restoration 9 10 Feeder Self-Healing System: Automatic, Autonomous Fault Isolation and Service Restoration
11 Self-Healing Systems Ungrounded System Solidly grounded System
12 Current FISR Scheme A. Ungrounded Distribution System 12
13 Zero-sequence Current in SLG fault Ic3 A T Ic2 B 모모 In Ic2+Ic3 Ic1 F Ic1 C In GPT
14 SGR-based Faulted Circuit Detection a b c Source Main Transformer ZCT1 IC1 C1 A feeder Vo rn GPT ZCT2 Operating Zone In Vo P1 C1 P2 C2 SGR1 IC2 C2 B feeder Sum Ic If Ic1, Ic2 Not Operating Zone P1 C1 P2 C2 SGR2 ZCT3 C feeder fault Rf P1 C1 IC3 C3 P2 C2 SGR3
15 FISR in Ungrounded System CB SW1 SW2 SW3 SW4 SW5 a) b) fault c c) d) e) No fault experience No fault experience Fault experience f) g) h) CB (close) Fault section isolation Service restoration CB (open) SW (close) SW (open) many switchings customer interruption
16 Current FISR Scheme B. Solidly Grounded Distribution System 16
17 Fault Section Identification SW1 SW2 SW3 SW4 SW : FI (Fault Indicator)
18 Centralized FISR 5-8 minutes for FISR 18
19 Example 9 10 Feeder : Close state Recloser 14 : Open state Recloser : Close state A/S : Open state A/S
20 Restoration Planning Five Basic Schemes: 1 SGR 2 DGR 3 TGR 4 SGRLT 5 DGRLT
21 Single Grouping Restoration (SGR) 9 10 Feeder : Close state Recloser 14 : Open state Recloser : Close state A/S : Open state A/S
22 Double Grouping Restoration (DGR) 9 10 Feeder : Close state Recloser 14 : Open state Recloser : Close state A/S : Open state A/S
23 Triple Grouping Restoration (TGR) 9 10 Feeder : Close state Recloser 14 : Open state Recloser : Close state A/S : Open state A/S
24 Self-Healing Distribution System
25 A. Self-Healing in Ungrounded System
26 A. Single-Tie Case step #1 1 Send fault information to control center SW1 SW2 fault Central Control Agent N.O SW3 SW4 SW5 SW6 2 step #2 Central Control Agent OPEN Move N.O point to source side of #1 feeder CLOSE 1 SW1 SW2 SW3 SW4 SW5 SW6 2
27 step #3 1 Move N.O point to source side OPEN SW1 SW2 Central Control Agent CLOSE Send fault experience to control center SW3 SW4 SW5 SW6 Fault Experience 2 step #4 Central Control Agent OPEN Finished the fault isolation and service restoration 1 SW1 SW2 SW3 SW4 SW5 SW6 2
28 B. Multi-Tie Case Configuration of Normal Operating Condition Central Control Agent F2 N.O SW10 SW9 F1 SW3 SW4 SW5 SW8 N.O F3 SW1 SW2 SW11 SW6 SW7 SW12 SW13 CB (close) CB (open) N.O SW14 SW (close) SW (open) F4
29 F2 Central Control Agent N.O SW10 Send fault information to control center Send #1 s fault experience to fault detector of each feeder SW9 F1 SW3 SW4 SW5 SW8 N.O F3 SW1 SW2 SW11 fault SW6 SW7 SW12 SW13 CB (close) CB (open) N.O SW14 SW (close) SW (open) F4
30 F2 4000kVA Central Control Agent Move N.O point to source side SW10 F1 SW3 SW4 2500kVA SW5 SW9 SW8 F3 SW1 SW2 SW11 SW6 SW7 2000kVA 3000kVA SW12 SW13 SW14 F4 CB (close) SW (close) CB (open) SW (open)
31 Central Control Agent Send fault experience to control center F2 SW10 F1 Move N.O point to source side SW3 SW4 SW5 SW9 SW8 F3 SW1 SW2 SW11 SW6 SW7 SW12 SW13 SW14 F4 CB (close) SW (close) CB (open) SW (open)
32 F2 Central Control Agent SW10 F1 Finished the fault isolation and service restoration SW3 OPEN SW4 SW5 SW9 SW8 F3 SW1 SW2 SW11 SW6 SW7 SW12 SW13 SW14 F4 CB (close) SW (close) CB (open) SW (open)
33 Remarks Fault section can be isolated without outage This scheme can be expanded to multi-tie system Progressive scheme is limited to a single tie system Decreased number of switching
34 B. Self-Healing in Solidly-grounded System
35 Peer-to-Peer Communication Switch P2P Switch
36 New FISR has a three steps 1) Adaption of Agents (Information Transmission) 2) Fault Section Identification 3) Service Restoration 36
37 Adaption of Agents Step (Information Transmission) Communication network information (IP address of other agents) Switching of pre-planned restoration solution 37
38 Fault Section Identification Step Exchange of FI & autonomous decision of switching 38
39 Service Restoration Step Switching command sent to others 39
40 DNP 3.0 : Master-Slave (Switch)
41 MASX : Agent Enabler Agent Device (MASX) Application structure of MASX 41
42 Protocol & Communication structure of MASX Protocol structure Communication network structure < D A S > 42
43 Test in Gochang test center Network diagram 43
44 Example network SL 13 G 6 PAD 2 3 PAD 7 G PAD 2 SL 14 SL 19 SL 18 SL 24 PAD 3 NL 47 NL 35 NL 17 2 R G G G PAD 4 G G G G G 5 8 PAD 1 2 SL : South line NL : North line PAD : Pad-mounted FRTU NL 44 NL 33 G G 4 7 PAD
45 Field-Test Scenario Fault location Between 18 and 19 Fault type A phase grounded fault Restoration solution 1 related : C (from 3 to 6, close) 2 related : O, C, C 3 related : O, C, O, C, C 45
46 Artificial Fault Generator
47 Test Result Test result interface Gochang power test center in Korea (Preparing field test) Test result measurement 47
48 Conclusions Communication-based FISR introduced A. Ungrounded system Outage free More efficient usage of power equipments B. Solidly grounded system Faster fault handling time from 5 ~ 8 min to less than 1 min (CDMA) a few seconds (Ethernet) 48
49 More information at APAP2017 (Paul) S.J. Lee
50 Banquet Come and enjoy the festival of family in Automation & Protection Oct , 2017 Jeju, Korea (Paul) S.J. Lee
51 APAP 2017, Jeju Oct. 2017
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