IEEE Power & Energy Magazine - May/June 2014 - 80

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Line1
STN1

Line1
STN2

Line3

Line4
STN1

Line4
STN2

Line5

Contingencies

To Another
Gen Shed
Selection

Arming Statuses

Actions
Trip G1

Trip G2

Trip G3

Trip G4

-

figure 4. A contact logic diagram of an arming matrix.

BC to AB
(MW)
GS =1.15 * [(5L76 + 5L79) ACK + 5L98 VAS - 1780]
Shed at REV the Lesser of:

* GS, or

Shed at REV/ KCL/ALH/SEV/WAN/BRX:
(5L76 + 5L79) ACK + Z + 1L214 VNT

* The Available Generation for Shedding, and Shed at
KCL/ALH/SEV/WAN/BRX the Greater of:
* 1.15 * [(5L91 + 5L96) SEL - Y], or
* GS-the Armed Generation Shedding Amount at REV (0, 0)
GS = 1.25 * [(5L76 + 5L79) ACK + 5L98 VAS - 1,900]
If GS >1,500 and AB to BC > 500 MW, then
* Arm DTT 5L94, and
* Arm DTT 1L274 and DTT 1L275 Except for the RAS
Blocking Conditions Specified in Section 9.3 of SOO 7T-17,
and
* Shed at REV the Lesser:
* 0.94*GS-AB to BC, or
* the Available Generation for Shedding, and
* Shed at KCL/ALH/SEV/WAN/BRX the Greater of:
* 1.17 * [(5L91 + 5L96) SEL -Y-AB to BC], or
* 0.94 * GS-AB to BC-the Armed Generation
Shedding Amount at REV
Otherwise
* Shed at REV the Lesser of:
* GS, or
* The Available Generation for Shedding, and
* Shed at KCL/ALH/SEV/WAN/BRX the Greater of:
* 1.25 * [(5L91 SEL + 5L96 SEL)
* GS-the Armed Generation Shedding Amount at REV

BC to US (MW)

GS = (5L76 +5L79) ACK+ 1L214 VNT + Z
If GS >1,500 and AB to BC > 500 MW, then
* Arm DTT 5L94, and
* Arm DTT 1L274 and DTT 1L275 Except for the RAS Blocking
Conditions Specified in Section 9.3 of SOO 7T-17, and
* Shed at REV/KCL/ALH/SEV/WAN/BRX: GS-AB to BC
Otherwise,
* Shed at REV/KCL/ALH/SEV/WAN/BRX: GS

figure 5. The generation-shedding requirement for a contingency under predefined system conditions.
80

ieee power & energy magazine

may/june 2014



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2014

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