Technical Presentations

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

WAPA COTP (California Oregon Transmission Project) Series Capacitor Bank Replacement866

Abstract
Throughout this case study, you will learn about the California Oregon Transmission Project (COTP) and its goal of replacing the existing fixed series capacitor banks (FSCBs) with new equipment.

Tag(s): capacitor bank, frequency dependent line, overvoltage, distribution substation

Transient immunity assessment of wind and solar parks773

Abstract
Abstract
Inverter-base Resources (IBRs), such as solar photovoltaic (PV) and wind parks are subject to transients which may cause more issues as compare to traditional generation due to the colle... see morector grid and the geographical spread between converters. In this webinar, we present several challenges which may be faced by planners and park developers:
- Transient immunity against utility-owned capacitor bank switching. Assessment of IEEE Std 1547-2018.
- Ferroresonance after open-phase faults.
- Temporary overvoltage (TOV) in a PV parks after a phase-to-ground fault
Events and EMTP simulations will be described and analysed during the webinar.
This work was performed with the collaboration of Bob Arritt, EPRI and Chest Li, Hydro One

Presenters:
• Hossein Ashourian - Power System Modeling and Simulation Specialist

• Anton Stepanov - Research And Development Specialist

A Project to Correct Mill Power Factor748

Abstract
<h2 class="title">EMTP USA User Conference 2019 </h2> <p class="tagline"><b>A Project to Correct Mill Power ... see moreFactor</b></p> <p id="text-intro">Selecting the proper size capacitor bank for power factor correction at a pulp mill with an existing capacitor bank in service requires many hours of computer modeling and system simulations. This paper discusses the calculations involved in specifying the capacitor bank and evaluates the system response to transient switching events involving the two capacitor banks. Finally, the paper provides a comparison of the results of the calculations with field measurements recorded during the commissioning of the new capacitor bank.