Whirlwind AA-Bank RAS Modifications

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1 Whirlwind AA-Bank RAS Modifications Edison Team Members: Adrian Franco Electric System Planning Bill Zhang - Protection Engineering Obinna Obah - Power System Controls Hans Bakker - Communications Presentation to RASRS May 1,

2 OBJECTIVE Approval of Whirlwind AA-Bank RAS Modifications 2

Topics Adrian Franco Electric System Planning (ESP) Background Purpose/Operating Principles Planning Studies Bill Zhang Protection Design Modifications Design Requirements Relay Hardware Monitoring

3 Topics Adrian Franco Electric System Planning (ESP) Background Purpose/Operating Principles Planning Studies Bill Zhang Protection Design Modifications Design Requirements Relay Hardware Monitoring Abnormal Operation Conditions Hans Bakker Telecommunications Existing and new RAS Equipment Obinna Obah Power System Controls Objectives Reliability Automatic Arming Program Operation EMS Display 3

4 Electric System Planning Background Whirlwind Substation, designed for four 500/220 kv transformer banks ( AA Banks in SCE terminology), currently has three AA transformers banks in service (1AA, 3AA, & 4 AA) Previous RAS approvals: April 2014: Original approval by RASRS April 2015: 18 MW of generation was added to the RAS at Soleil Substation November 2015: 415 MW of generation was added to the RAS at Astoria, Garland, and Roy Substations July 2016: 108 MW of generation was added to the RAS at Teddy Substation November 2016: 3rd AA bank was added to Whirlwind Substation 4

5 Electric System Planning Purpose/Operating Principles The purpose of the Whirlwind AA Bank RAS is to prevent thermal overloads on the remaining Whirlwind AA Banks, upon loss of one (N-1) or two (N-2/N-1-1) of the three AA Banks, by tripping selected generation projects in the immediate area. Requesting approval to add the following projects to RAS Q643AJ-Willow Springs (Desert Flower Subs) 100 MW Q643R North Rosamond (Rattlesnake Subs) 150 MW Q1074 Gaskell West 20 MW Original Operating Date: July 21, 2015 Operating Date for requested changes: October 1,

6 Electric System Planning Whirlwind AA Bank RAS Area Map Location of SCE facilities and Generating Units TO VESTAL TO SPRINGVILLE SYCAMORE OMAR MIDWAY MAGUNDEN Mandible HIGHWIND CPC West CPC East WINDHUB Garland Suncreek MIDWAY PASTORIA PEF LEBEC EDMONSTON PUMPING PLANT (CDWR) BAILEY Manzana Desert Star Rose Meadow WHIRLWIND Kingbird Avenue Solar Ranch Roy Teddy WARNE ANTELOPE TO SANTA CLARA PARDEE VINCENT TO RIO HONDO TO MOORPARK TO SYLMAR TO GOODRICH TO MESA TO SAUGUS 6

7 Electric System Planning Planning Studies The purpose of the RAS Arming Study is to identify the appropriate RAS arming levels required under all plausible system operating conditions. The power flow cases were developed from the WECC base cases and SCE s transmission expansion base case series. The RAS Arming Study looks at a wide range of load levels, generation levels, and voltage conditions. Through this type of analysis, the RAS Arming Study identifies the appropriate contingencies that need to be protected by the RAS. 7

have requested interconnection to Whirlwind Substation.

8 Electric System Planning Planning Studies Table 1-1 represents the queued generation up to Cluster 8 that have requested interconnection to Whirlwind Substation. In-service Now: 1858 MW Up to QC8: 3185 MW QC9: 1439 MW QC10: 580 MW 8

9 Electric System Planning Planning Studies Operating Voltages 500 kv System Voltages SOB0017 Whirlwind kv Whirlwind kv AA Bank Rating - SOB0033

Electric System Planning Contingency Analysis (N-1) The following table shows the outage overload results identified in the Whirlwind AA Bank RAS

10 Electric System Planning Contingency Analysis (N-1) The following table shows the outage overload results identified in the Whirlwind AA Bank RAS Arming Study. The table summarizes the maximum loading levels identified for the remaining AA banks under a single outage at different generation outputs. 10

11 Electric System Planning Contingency Analysis (N-1) The following table shows the resulting loading on the AA banks after the RAS has armed and tripped generation. MVAR Flow: PRE is after the loss of an AA bank but before the RAS trips generation 11

12 Electric System Planning Planning Studies N-1 Equation Y=1.0134x Orange line Needed to be at 99% of LTELL (MVA)

Electric System Planning Contingency Analysis (N-2/N-1-1) The following table shows the outage overload results identified in the Whirlwind AA Bank RAS Arming

13 Electric System Planning Contingency Analysis (N-2/N-1-1) The following table shows the outage overload results identified in the Whirlwind AA Bank RAS Arming Study. The table summarizes the maximum loading levels identified for the remaining AA banks under an outage of two AA Banks at different generation outputs. 13

14 Electric System Planning Contingency Analysis (N-2/N-1-1) The following table shows the resulting loading on the AA banks after the RAS has armed and tripped generation. MVAR Flow: PRE is after the loss of an AA bank but before the RAS trips generation 14

15 Electric System Planning Planning Studies N-1-1 Equation Y=0.9977x Orange line Needed to be at 99% of LTELL (MVA)

16 Electric System Planning Planning Studies N-1 Equation Y=1.0134x N-1-1/N-2 Equation Y=0.9977x X= MW Flow on 1AA, 3AA & 4AA

17 Electric System Planning Bus Split Equation As part of this modification we will add the split bus operation equations

18 Electric System Planning Planning Studies Diagram shows theoretical power flow at Whirlwind AA Banks with all generation up to QC7 online 500kV BUS

19 Electric System Planning Planning Studies Section A: 1AA flow =909 MW Section B: 3AA+4AA flow = 1818 MW N-1 Equation Y=1.0134x X= 909 MW+1818 MW =2727 MW Generation armed = MW

20 Electric System Planning Planning Studies With the starting condition of one of the bus-sectionalizing breakers out for maintenance followed by Fault on transformer and stuck breaker 500kV BUS

21 Electric System Planning Planning Studies Current 3AA+4AA = 909 MW +909 MW = 1818 MW Using N-1-1/N-2 Equation Y=0.9977x Generation tripped = ~500 New Equation Using N-1-1/N-2 Equation Y=0.9977x X=3AA (909 MW)+4AA (909 MW)+CB1 (0 MW)+CB2 (219 MW) Actual generation needed to be tripped is ~718 MW

22 Electric System Planning Planning Studies N-1-1/N-2 Equation : Y=0.977x New Prosed equation is same as N-1-1/N-2 Y=0.9977x Changes under this condition X = Flow on (3AA+4AA+CB1+CB2) Generation tripped from Section B only

23 Electric System Planning Planning Studies Orange line Needed to be at 99% of LTELL (MVA) Section B has N-1

24 Electric System Planning Transient Stability Analysis Studies were performed with a scenario of normal fault clearing time of 6 cycles. Studies were performed with a scenario of a delayed fault clearing time of 13 cycles. Generation Tripping Times Worst case scenario : 25 cycles 24

25 Electric System Planning Conclusion The inclusion of the projects listed below did not have an adverse impact on the Whirlwind RAS. Q643AJ-Willow Springs MW Q643R North Rosamond 153 MW Q1074 Gaskell West 20 MW The Whirlwind RAS will initiate once an N-1 or N-2/N-1-1 outage of any of the three AA banks has been detected in order to prevent thermal overloads on the remaining AA banks New equation introduced in the event a bus split and an outage of one of the two AA banks in Section B occurs 25

Electric System Planning Conclusion The Whirlwind AA Bank RAS will trip a combination of the following generation to mitigate thermal overload: Once more generation connects to

26 Electric System Planning Conclusion The Whirlwind AA Bank RAS will trip a combination of the following generation to mitigate thermal overload: Once more generation connects to the Whirlwind 220 kv bus, the Whirlwind AA Bank RAS will need to be modified Transient stability studies concluded that the system will remain stable under various contingencies 26

27 WHIRLWIND RAS Protection Engineering Bill Zhang 27

28 Protection RAS Modifications Single Line Diagram of Whirlwind RAS 28

29 Rattlesnake Desert Flower Gaskell W1 Protection RAS Modifications Add two pairs of N60 relays at Whirlwind Subs for Monitoring the North and South 220kV Bus Section CB s Tripping interfaces to the three new Generations Add diversely-routed redundant communications paths to the new Generations Existing Generations 29

Protection RAS Modifications Add new arming points for The operation conditions of the 220 kv buses at Whirlwind being split (both South and North 220 kv Bus section CBs open) Tripping to the three

30 Protection RAS Modifications Add new arming points for The operation conditions of the 220 kv buses at Whirlwind being split (both South and North 220 kv Bus section CBs open) Tripping to the three new Generations Add watt transducers to the 220 kv bus section CBs at Whirlwind Subs and connect them to the EMS RTU. The EMS needs the bus section CB power flow (MW) in order to calculate the arming requirements for the new set of arming points 30

31 Protection Design Requirements The modifications comply with the existing RAS requirements Single failure cannot prevent trip output Redundant identical systems Diversely-routed redundant communications paths Contingency-triggered logic RAS action occurs only for an N-1 or N-2 outage condition for which the RAS is armed Arming logic prevents RAS operation if arming occurs after triggering contingency has occurred Pre-contingency arming by Automatic Arming Program 31

32 Protection Design Requirements Provide multiple means of arming Automatic Arming Program in EMS Remote Manual Arming via EMS Redundant RTU s One RTU for RAS-A One RTU for RAS-B RTU s provide the interface between EMS and RAS Controllers for Automatic Arming Program and Remote Manual Arming via EMS Local Manual Arming via N60 relay front-panel pushbuttons at Whirlwind Substation Used in case of RTU or EMS failure All RAS relays are dedicated to the RAS and do not share any function with any other protective scheme 32

33 Protection Relay Hardware GE N60 relays used throughout Except a C30 relay handing the Auto-Test Logic. Remote I/O (IEC GOOSE) Relay-to-Relay Communications Bank Monitors High and low-side CBs and currents are monitored independently Open CBs and lack of current on either side of the bank constitutes a bank-out condition Logic Processors N-1 and N-2 contingency detection Receiving Arming from EMS Local manual arming (pushbuttons) Transmission of trip signals to participating generators via Direct I/O communications over diversely-routed redundant C37.94 channels Tripping Relays (at Generation facilities) Monitored trip output contact for each circuit breaker to be tripped BFI output contact for each breaker to be tripped 33

34 Protection RAS Monitoring Relays/RTU/EMS Relay Failure alarms Relay Communications Failure and Trouble alarms CB Disagreement alarms CB Error alarms Arming status AA-Bank outage status RAS Trip alarm 4-second update 34

35 Abnormal Operating Conditions Relay Failure (Bank Monitor, Logic Processor, Tripping Relay) or Communications failure Disable the associated RAS (A or B) Complete loss of RAS What is considered as complete loss of RAS Loss of components in both RAS A and RAS B Loss of communications channels in both RAS A and RAS B Loss of RAS A comm channel and RAS B component, or vice versa Disable both RAS systems and request CAISO to implement congestion management to maintain AA-Bank flows to with acceptable limits 35

36 WHIRLWIND RAS Telecomm Engineering Hans Bakker 36

37 Telecommunications Existing and New Telecom Circuits ROY Rattlesnake Desert Flower SOLAR RANCH Gaskell West GARLAND AVENUE WHIRLWIND DESERT STAR TEDDY RING OF DIVERSE FIBER CABLE KING BIRD SOLEIL SOLAR Key Existing New 37

38 Telecommunications Whirlwind to Rattlesnake 38

39 Telecommunications Whirlwind to Desert Flower 39

40 Telecommunications Whirlwind to Gaskell West 40

41 Telecommunications EQUIPMENT REDUNDANCY EQUIPMENT DESCRIPTION MANUFACTURER MODEL REDUNDANCY CHANNEL BANK ZHONE IMACS 800 CPU, POWER SUPPLY, T1 MODULE OHSU IEEE C Channel Unit ZHONE I None, however spare channel port and channel reserved for future should the need arise. DACS Sycamore DNX-11 All critical electronics 1:1 SONET (LW) Alcatel - Lucent DMX Family of Access Multiplexer 1:1 41

42 Telecommunications SONET employs element management systems All sites have point alarms for equipment & environmental alarm Telecomm Control Center (TCC) monitors 24x7x365 using NetCool which replaced the previous tool NetExpert TCC responsible for coordination & dispatch of repair personal Comm Techs based through service territory; spare parts are stored at several key locations Priority 1 problems have 2 hour response time and 4 hour repair time. 42

43 WHIRLWIND RAS PROJECT Power System Controls Obinna Obah 43

44 Power System Controls Modifications to the Whirlwind RAS Project Objectives: The existing Whirlwind RAS (WHDRAS) automatic arming program will be modified to: Add Rattlesnake, Desert Flower and Gaskell West Generators Add arming points for N-1 AA transformer Banks with bus section CBs open Automatic arming program will calculate appropriate amount of generation to arm and trip to mitigate thermal overloads on the remaining bank(s) upon: N-1 or N-2 loss of any of the of AA transformer banks with bus sections paralleled N-1 loss of any of the AA transformer banks with both bus section CBs open 44

45 Power System Controls Modifications to the Whirlwind RAS Project Reliability: Automatic Arming program is a software application running in SCE s redundant Energy Management System (EMS) that monitors the status and loading of transformers and generators participating in the RAS. 45

46 Power System Controls Modifications to the Whirlwind RAS Project Automatic Arming Program Operation: The Whirlwind RAS automatic arming program runs every four seconds and retrieves transformer flow and status, bus section circuit breaker flow and status and generation output data used for arming determinations. Program calculates arming requirements every five minutes or whenever flows on monitored transformer banks change more than the value set by the operator. Utilizes best-fit algorithm to optimally arm the appropriate amount of generation to trip for N-1 and N-2 loss of any of the of AA bank transformers. 46

47 Power System Controls 47

48 SCE is requesting approval of Whirlwind AA-Bank RAS Modifications to add the following three projects: Willow Springs 100 MW N. Rosamond 150 MW Gaskell West 20 MW

49 Thank You!

Standard Development Timeline

PRC 012 2 Remedial Action Schemes Standard Development Timeline This section is maintained by the drafting team during the development of the standard and will be removed when the standard becomes effective.