Landsnet. Five years of synchrophasor use in the control center. NASPI Work Group Meeting February 2013, Huntington Beach, CA
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1 Landsnet Five years of synchrophasor use in the control center NASPI Work Group Meeting February 2013, Huntington Beach, CA Ragnar Guðmannsson System Operation
2 Overview 1. The Icelandic Transmission System and challenges in System Operation 2. WAMS in Landsnet s control room 3. WACS project s 4. Results and future development
3 Location of Iceland with distances over the Atlantic Ocean
4 Generation and Consumption
5 Generation Capacity ,5% 1,5% 4% 10% 0,5% MW % 0,5% 13% 6% 55% Transmission lines 220 kv 132 kv 66 kv 33 kv Substation Geothermal Hydro
6 Generation Capacity % 3% 30% MW % 14% 36% 4% Transmisson lines 220 kv 132 kv 66 kv 33 kv Substation Geothermal Hydro
7 WAMS and tuning of PSS to improve stability in relation to commissioning of 690 MW generation and load in 2007 KR2 FLJ/KAR G G G G G G KRA 60 MW KR2 FL2 B A BLA 150 MW KAR 690 MW SI4 B ARE A PMU PSS Data center Auxiliary load 25 MW Potline 535 MW
8 Now 12 PMUs installed, with detail of Eastern 220kV AC system (DC to follow) for co-ordinating control KR2 FLJ/KAR G G G G G G KRA 60 MW KR2 FL2 B A BLA 150 MW KAR 690 MW SI4 B ARE A PMU PSS Data center Auxiliary load 25 MW Potline 535 MW
9 WAMS in Landsnet s control room Psymetrix - PhasorPoint RT monitoring of system stability PMU installation 2013 ARE, HRY, BUR, BUD, KLA PMU installation 2014 REY, ISA Data center is located at Landsnet control center Gylfaflöt Krafla Blanda Brennimelur Hrauneyjafoss Fljótsdalur Sigalda PMU location Data Centre 220kV 132kV 66kV
10 WAMS in Landsnet s control room WAMS - PhasorPoint EMS Tetra
11 WAMS in Landsnet s control room
12 WAMS Operator view Normal operating condition High resolution measurment [Hz, MW, kv, MVAR] - observation window 15 min (was 1-2 hr) - oscillation not seen by conventional EMS - damping, frequency bands (new) Maintenance Security assessment - predefined graph for better monitoring of system conditions Open 132 kv ring - interarea mode (0,3 to 0,5 Hz) - variation af production and influence on damping - better view of angle condition when closeing
13 WAMS Operator reponse Critical events or operating condition Opening of 132 kv ring (inter area mode) Trip of smelter load ( large proportion of total load) Trip of generation (at high transport between areas) Operator training EMS training simulator (3 days in 6 months interval) WAMS Known Issus Predefined actions Operator response Active power control of Hydro units GOV - AGC PSO Voltage control units, capacitor banks System spilt to prevent power ocillations Reduction of smelter load
14 WAMS trip of line on 132 kv ring PSO opens bustie CB at BLA Trip of FL2 open 132 kv ring FL2 CB closed at FLJ trip again
15 WAMS trip and reconnection of 132 kv ring Trip of SI4 open 132 kv ring System protection split at BLA 132 kv ring connected at HOL 132 kv ring closed at BLA
16 WAMS PSS tuning and system tests PSS off in KRA PSS on in KRA
17 WAMS PSS tuning and long-term tests 1.2Hz Mode 0.8Hz Mode Mode Amplitude (MW) Before PSS tuning After PSS tuning Mode Amplitude (MW) Mode Decay Time Constant (sec) Mode Decay Time Constant (sec)
18 WAMS PSS testing at HRA Unit without PSS and above normal operating limits [70 MW] 17,5 MW Test during PSS commisioning to check PSS damping performance
19 WAMS - KR2 out production changes Brennimelur FLJ Sigalda
20 WACS Project overview Psymetrix Wide Area Defence Scheme started 2011 Power balance of areas Prevent system split Increased system security Secondary Load Shedding started 2013 Increased power flow on 132 kv ring Faster shedding after system split More focus on lower voltage levels (smart grid) Increased system security PMU PDC Tetra modem trip of load
21
22 WACS - dynamics related to 132 kv ring BL2 A frequency SV frequency SI4 Load 132kV ring power flow Production area
23 WACS - Trip of 500 MW smelter load in SouthWest Active Power 132 kv ring Active Power 132 kv ring to KAR/ARE Frequency Voltage angle between FLJ and SIG
24 WACS - Wide Area Defence Scheme
25 WADS - Wide Area Defence Scheme Emergency control to maintain system stability seen as grid service, similar to underfrequency load shed targeted, controlled action to reduce overall impact Uses measurements from PhasorPoint - frequency, voltage angle Trips generation in an area where a large proportion of load has tripped Proportionate response to angle stability condition Increased system security with connected system
26 Results Knowledge of system dynamics has increased PSO s response time shorter and more affective Improved capability to analyse disturbances Important for testing and monitoring of regulation equipment GOV, AVR, PSS Knowledge of system dynamics has increased Stability has significantly increased with successful PSS tuning
27 Future : Improved damping PSS tuning of all hydro and geothermal units SVC POD commissioning and tunning Tunning of smelter load regulation equipment
28 Future : Governor design and tuning New governor design for Geothermal Island operation Geothermal units in AGC for emergency control Optimal settings for Hydro units in island operation to deal with smelter load variation after long outage
29 Future : WACS and smart grid solutions Emergency control of smelter load to reduce impact of disturbances Control of all secondary load from EMS and WACS (0-120 s) Intelligent system design to ensure secure system split depending on operating conditions
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