Wide Area Protection WAP for a Major Load

Wide Area Protection (WAP) for a Major Load Center using a Fast Load Shedding Scheme By Victor Wong General Manager, Power Transmission Sarawak Energy Berhad Presented at PQ Synergy 2010, Bangkok

SEB Outline Introduction Concept of WAP Architecture Dynamic Simulation Performance of WAP Conclusion Private and Confidential Do not duplicate or distribute without written permission. Slide No. 2

SEB 1. INTRODUCTION Private and Confidential Do not duplicate or distribute without written permission. Slide No. 3

SEB Sarawak State Transmission Grid (75 MW gas) Grid System Demand : 1040 MW Installed Capacity : 1233 MW 275 k. V Line : 767 km (506 MW gas) (270 MW coal) (210 MW coal) (78 MW diesel) (94 MW hydro) Private and Confidential Do not duplicate or distribute without written permission. Slide No. 4

SEB Sarawak 275 k. V Grid System – Typical power flow SELANGAU 275 k. V KCH P/S SPC Coal Gen =210 MW TAR Diesel Gen =78 MW MAMBONG 275 k. V ~ Kuching Load 450 MW MTD Mukah 132 k. V Load 20 MW ~ OYA 275 k. V ~ 250 MW Engkilili Load 19 MW Private and Confidential Smelter Load 100 MW Mukah Coal P/S MPG Gen=270 MW BAT Hydro AI P/S BAI Gen =94 MW ENGKILILI 275 k. V PMB 132 k. V KEMENA 275 k. V Bintulu Gas P/S Bin Gen=506 MW BINTULU 275 k. V ~ 220 MW KEM Sarikei Load 29 MW Do not duplicate or distribute without written permission. 335 MW Sibu Load 125 MW 185 MW 230 MW Bintulu Load 45 MW Slide No. 5 Miri Gas P/S Miri Gen=75 MW Tudan 275 k. V ~ 55 MW Bintulu Load 60 MW Miri Load 135 MW

SEB UFLS To Mitigate Double Circuit Tripped Contingency UFLS is not effective in mitigating double circuit tripping for Sarawak power system ( 9 th August 2008 Event ) Wide Area Protection (WAP) aka System Protection Scheme (SPS)] designed & implemented to supplement the existing UFLS to mitigate against double circuit tripped contingency Private and Confidential Do not duplicate or distribute without written permission. Slide No. 6

SEB 9 th August 2008 incident Loss of both circuit Selangau-Kemena lines Private and Confidential Do not duplicate or distribute without written permission. Slide No. 7

SEB 2. CONCEPT OF WIDE AREA PROTECTION (WAP) Private and Confidential Do not duplicate or distribute without written permission. Slide No. 8

SEB Concept OF WAP Objective of WAP deployment in Sarawak power system Safeguard Kuching power system Automatic corrective measures Loss of double circuit sections Mambong-Engkilili-Oya-Selangau-Kemena-Bintulu WAP system ACQUIRE generation and load information COMPUTE quantum of loads needed to be shed for a set of predefined contingent events DETECT the inception of the contingent event with sensors located strategically in the power system TRIP command to shed loads within 150 ms + CB opening time Private and Confidential Do not duplicate or distribute without written permission. Slide No. 9

Concept OF WAP SEB MAMBONG SELANGAU OYA CB STATUS ENGKILILI KEMENA ~ BINTULU ~ ~ BINTULU SYSTEM KUCHING SYSTEM KEM SDC UR F 35 Relay Monitor & Control Workstation (MCW) with fail-over facility WIDE AREA NETWORK System Info. Collection MW, MVAR, MWH, V, Freq MCW WAN CB OPENED MCW ARMING SIGNAL (BASED ON PRE-DETERMINED LOAD SHEDDING TABLE) Substation A Substation B Substation C Substation D DAW DAW UR F 35 Trip Signal 33/11 k. V feeders Private and Confidential Do not duplicate or distribute without written permission. DATA ACQUISITION UNIT (DAW) AT OYA & SELANGAU Trip Signal 33/11 k. V feeders Slide No. 10 Trip Signal 33/11 k. V feeders

SEB 3. WAP ARCHITECTURE Private and Confidential Do not duplicate or distribute without written permission. Slide No. 11

WAP ARCHITECTURE SEB SELANGAU ~ ENGKILILI MAMBONG KEMENA OYA ~ BINTULU ~ ~ KEM ZONE 1 ZONE 2 ZONE 3 ZONE 4 ZONE 5 1. Zone 1 : Mambong – Detect Engkilili-Mambong Double Circuit Tripping 2. Zone 2 : Engkilili – Detect Engkilili-Kemantan-Oya Double Circuit Tripping 3. Zone 3 : Oya – Detect Oya-Selangau Double Circuit Tripping 4. Zone 4 : Selangau – Detect Selangau-Kemena Double Circuit Tripping 5. Zone 5 : Kemena – Detect Kemena-Bintulu Double Circuit Tripping Private and Confidential Do not duplicate or distribute without written permission. Slide No. 12

SEB Setup of the Wide Area Protection System Private and Confidential Do not duplicate or distribute without written permission. Slide No. 13

Main Control Workstation (MCW) SEB Collect the data i. e MW, MAVR, frequency, CB Status, MWH and voltage from all 35 DAWs. Perform data conversion from data collected and stores the data at its internal process database (PDB). Send selected data to historian server for data archival and to client HMI for operator display. Perform deficit calculation on 3 minutes interval to update WAP load shedding table for each zones. Send out arming or disarming signal to all affected feeders. Disable or enable WAP scheme Private and Confidential Do not duplicate or distribute without written permission. Slide No. 14

Data Acquisition Unit (DAW) SEB Collects and stores WAP related data from protection relays and energy meters in real time using Modbus protocol Sends the data upon request by the MCW Receives arming information, selection criteria, and zone status from MCW and stores them in the internal table every 3 minutes Monitors IEC 61850 GOOSE messages for double-circuit tripped status originating from EHV substations Performs logic operations based on the arming table and predefined WAP logic scheme Send tripping signal to protection relay to execute tripping EHV substations DAW receives 275 k. V double circuit lines CB status (IEC 61850 GOOSE messages) from protection relays and relays them to the other substations Private and Confidential Do not duplicate or distribute without written permission. Slide No. 15

Human-Machine Interface (HMI) SEB Operator display Local control request/completed notification Low WAP margin Low WAP selection Double-circuit tripping detection Automatic failover WAP faulty Communication error at any of the substations Disable or enable WAP scheme Remove or add in substations/feeders from load shedding table Private and Confidential Do not duplicate or distribute without written permission. Slide No. 16

SEB Private and Confidential Do not duplicate or distribute without written permission. Slide No. 17

SEB Private and Confidential Do not duplicate or distribute without written permission. Slide No. 18

SEB Private and Confidential Do not duplicate or distribute without written permission. Slide No. 19

SEB Private and Confidential Do not duplicate or distribute without written permission. Slide No. 20

SEB Private and Confidential Do not duplicate or distribute without written permission. Slide No. 21

SEB Private and Confidential Do not duplicate or distribute without written permission. Slide No. 22

SEB Private and Confidential Do not duplicate or distribute without written permission. Slide No. 23

SEB 4. DYNAMIC SIMULATION Private and Confidential Do not duplicate or distribute without written permission. Slide No. 24

SEB Dynamic Simulation Private and Confidential Do not duplicate or distribute without written permission. Slide No. 25

SEB Dynamic Simulation Private and Confidential Do not duplicate or distribute without written permission. Slide No. 26

SEB 4. PERFORMANCE OF WAP Private and Confidential Do not duplicate or distribute without written permission. Slide No. 27

SEB Performance Of WAP on 31 st October 2009 WAP Zone Operated = OYA Power import @ Oya= 290 MW Oya-Selangau double-circuit tripped Islanded Kuching power system Load demand = 462 MW Local generation = 172 MW System frequency dip to 48. 84 Hz recovered steadily to 50. 66 Hz. Load shedded by WAP Oya Zone 310 MW 138 feeders average WAP operating time : 108. 65 ms + CB operating time WAP deployed successfully to save Kuching power system from collapse Private and Confidential Do not duplicate or distribute without written permission. Slide No. 28

SEB WAP Performance on 31 October 2009 Incident Oya-Selangau Double Circuit Tripping Incident MW Loss Amount of Load Shed By SPS Total feeders shed by SPS Freq (Hz) Dip Post Steady State Freq (Hz) OYA-SLG Lines double circuit tripping 290 MW 310. 1 MW 138 48. 85 50. 66 Table 1 : Summary of SPS Performance Table 2 : SPS Operating Time (excluding CB opening time) Private and Confidential Do not duplicate or distribute without written permission. Slide No. 29

SEB Private and Confidential Do not duplicate or distribute without written permission. Slide No. 30

SEB 6. CONCLUSION Private and Confidential Do not duplicate or distribute without written permission. Slide No. 31

SEB Conclusion WAP scheme operation was validated Significantly enhance Kuching power system supply security Allows greater flexibility in system operation Allows more economic generation dispatch Private and Confidential Do not duplicate or distribute without written permission. Slide No. 32

SEB Thank You Any Question? Private and Confidential Do not duplicate or distribute without written permission. Slide No. 33