Technical Presentations

Secondary arc in hybrid AC DC overhead lines872

Abstract
This presentation covers a specific issue related to hybrid AC / DC overhead transmission lines: the extinction of the secondary arc current of a faulted DC pole. As a result of a pole-to-ground fault... see more, breaker openings interrupt the short-circuit current. Because of the inductive and capacitive coupling between the AC circuit and the faulted pole, a small AC current (a few 10ths Amps) keeps flowing in the fault. This current is known as the secondary arc current and it may disappear after some time.

Tag(s): AC/DC Lines, Secondary Arc, Sensitivity Analysis, Frequency Scan, Shunt Reactors, High-Speed Earthing Switches

Capacitor energization, power system conversion, and load flow studies in EMTP858

Abstract
The addition of capacitor banks to the system may result in the frequency shift of the resonance modes in the system. This change may result in undesired interaction of the system with other elements ... see moreduring the transients. In addition, the energization of the capacitor banks may result in undesired over voltage and high inrush current (above the breaker capability limits).

Following steps has been taken to ensure the addition of the new cap bank to the system will not adversely affect the performance of the system

• System conversion to EMTP from PSSE using import tool function in EMTP for 5 busses away from the system
• Running the load flow and benchmarking the results
• Running the frequency scan of the system
• Performing the transient studies for 100 breaker closing instances
• Perform the statistical analysis (available tool in EMTP)
• Perform the worst-case scenario achieved during the statistical analysis

Tag(s): capacitor switching, overvoltage, inrush current, PSS/E import tool, frequency scan, statistical analysis

Subsynchronous Control Interactions (SSCI) Studies using EMTP863

Abstract
This work presents a brief introduction to SSCIs, followed by parametric studies involving three PLL models. Additional key findings during SSCI screening studies performed by IEEE working group J18 w... see moreill be also presented.

Tag(s): parametric studies, PLL model, sub-synchronous oscillation, frequency scan

Wind & Solar Generation Impact on Negative Sequence & Power Swing Protection759

Abstract
<p>This presentation investigates the impact of wind generation on the performance of negative-sequence-based protection.</p><p>
Overview: - Main differe... see morence between EMT-type and phasor domain software. - Load-flow simulations - Time-domain simulations - Frequency Scan - Statistical runs for Insulation Coordination studies - Switching - Lightning - Transient Recovery Voltage (TRV) - Ferroresonance - FACTS/HVDC - Transient stability - Renewable - Power quality - LVTR/OVRT - Sub-synchronous resonance (SSR) - Overcurrent protection - Differential protection - Distance protection - Power-swing and out-of-step detection - Loss of field protection - Open-phase</p>

Grid Import Tool For EMTP Using CIM CGMES Format 758

Abstract
<p>This presentation targets CIM CGMES standard solution to data portability in relation to an EMT-type application. CIM is a format that attempts to be accessible and understandable to ... see moreall. The grid import tool allows to import static data from planning tools into EMTP that is the first step for frequency scan studies and time-domain simulations. Exchanging CIM dynamic data is in progress, some standard control systems have already been successfully imported. Abstract: The need of automation for the exchange of power system information between simulation tools is an increasing one. There are several methods for creating modeling portability between applications. Using a standard facilitates interoperable exchanges of power system network data between and within organizations and is substantial to become a durable portable method. This presentation targets CIM CGMES standard solution to data portability in relation to an EMT-type application. CIM is a format that attempts to be accessible and understandable to all. The grid import tool allows to import static data from planning tools into EMTP that is the first step for frequency scan studies and time-domain simulations. Exchanging CIM dynamic data is in progress, some standard control systems have already been successfully imported.</p>