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Marcio M. De Oliveira, ABB AB – FACTS and David Jacobson, Manitoba HydroEPEC 2011System Interaction Studies in Real-Time for the Birchtree SVC© ABB GroupOctober 26, 2011 | Slide 11JNS009958

Background New 200 MW Wuskwatim GS Several transmission facilitiesrequired, e.g. a new SVC for: Improving power oscillationdamping. Preventing excessive voltagereduction Reducing voltage flicker Power system issues Birchtree SVC electrically closeto hydro generators and existingPonton SVC Weakness of Manitoba’snorthern AC gridTesting of performance of theactual control system on a realtimesimulator was essential© ABB GroupOctober 26, 2011 | Slide 21JNS009958

Birchtree SVC Single-Line Diagram© ABB GroupOctober 26, 2011 | Slide 31JNS009958

V-I Characteristics of Birchtree SVC© ABB GroupOctober 26, 2011 | Slide 41JNS009958

Control System Functions of Birchtree SVC Voltage regulation of 230 kV bus Gain supervision Slow susceptance regulation Primary current limitation Negative-sequence control TSC self-test Power Oscillation Damping (POD) control© ABB GroupOctober 26, 2011 | Slide 51JNS009958

Main Objectives of RTDS Studies Including network representation sufficientfor exciting main oscillating modes Study of interaction between voltageregulation and POD function of Birchtreeand Ponton SVC’s Study Birchtree SVC operation in islandmode (Kelsey generation as only powersource) Verify control system behavior in presenceof harmonic distortion caused by GIC© ABB GroupOctober 26, 2011 | Slide 61JNS009958

Dynamic Performance Evaluation Example: 5 cycle 3-phase fault on Birchtree-Wuskwatim lineFrequencyBirchtree SVC voltage responseSusceptance reference© ABB GroupOctober 26, 2011 | Slide 7 PODs disabled PODs enabled1JNS009958

Dynamic Performance Evaluation N-1 scenario: 5 cycle 3-phase fault at Ponton SVC bus, followed by SVC tripBirchtree SVC voltage responseSusceptance referenceRed plots: POD disabledBlue plots: POD enabledFrequency© ABB GroupOctober 26, 2011 | Slide 81JNS009958

SVC Operation in Island Mode Trip of Ponton-Mystery Lake line with Birchtree-Wuskwatim line out of service→ island Kelsey GS - Thompson load – Birchtree SVC0.35 HzBirchtree SVC voltage response0.2 Hz Over-/Underfrequencylimits are used to disablethe POD function, avoiding0.2 Hz instabilityFrequencyPOD regulator output© ABB GroupOctober 26, 2011 | Slide 91JNS009958

GIC Impact on Control Performance Main concern: GIC leading to saturation of transformers anduncharacteristic harmonics (2 nd , 4 th ) in the system SVC transformer 3-phase with 3-limb core design Dimensioned for withstanding DC neutral current of 100 A for 1minute and 30 A for 2 hours TCR direct current control to avoid DC current generated by TCR Analysis method: injection of second harmonic at the 230 kV bus Transient interaction observed between second harmonic andPOD regulator PLL →Δf → washout filter of POD transfer-function → voltagereference ↑ → operation at 10 s overload region POD and negative-sequence control disabled if 60 Hznegative-sequence is above 3% longer than one minute© ABB GroupOctober 26, 2011 | Slide 101JNS009958

© ABB GroupOctober 26, 2011 | Slide 121JNS009958