Program of the UGM

08:00 Breakfast and Registration
09:00 Opening Remarks 

Recent developments and Road Map, Jean Mahseredjian, École Polytechnique de Montréal

This presentation is on the upcoming EMTP developments and versions. The new versions will deliver to the users powerful improvements in the graphical user interface, new models, new simulation options and new Toolboxes.


Modeling challenges in stability and protection studies for systems with high levels of renewablesEvangelos Farantatos, EPRI

The integration of renewable energy resources into power systems introduces several technical challenges. One major challenge is the impact on system protection, resulting from the complex fault response characteristics of these devices which are interfaced with the grid through power electronics based converters and do not behave similar to conventional synchronous or asynchronous machines. The goal of this EPRI research project is to investigate the performance of legacy protection schemes in systems with high levels of renewables, and potential misoperations which will reduce the reliability of the grid. An understanding of the way these devices affect system protection is needed so that protection and planning engineers design the protection schemes appropriately without jeopardizing the security of the system. The presentation will describe how EMTP-RV with its advanced wind turbine model library, as well as its new relay model library are being used in this project.


EMTP Used To Evaluate High Order Harmonic Issue at Chemical Plant, Theo Laughner, TVA

Generally, customers served by transmission level voltages rarely encounter issues with high order harmonics (greater than 13th harmonic).  However, TVA substation equipment was recently damaged when a customer was fed from an alternative feed.  The feed was much weaker than the normal feed and the process produced higher order (23rd) harmonic content. As a result, the voltage at the substation approached 170% of nominal conditions causing equipment to fail.  EMTP helped identify the harmonic source and the resonance condition.


Coffee break


Microgrid Protection Challenges and Mitigation Technologies, Jens Schoene (Enernex), Enernex & SCE 

Increasing penetration of Distributed Energy Resources (DERs) such as Photovoltaic generation (PV) and storage, opens the door for utilities for leveraging the potential of microgrids. Microgrids utilize DER to allow portions of the grid and critical facilities to operate independent of the larger grid thereby increasing reliability during disasters among other benefits. However, utilities are facing many protection challenges when trying to establish a safely-operating microgrid in both grid-tied and islanded mode. For instance, microgrid protection schemes need to be designed so that circuit breakers are properly sized and adequate system protection of the microgrid is ensured. Microgrids with a large portion of the local generation coming from inverter-based DER, such as PV, present a particular challenge as it is in question if these generators can supply sufficient fault current for fault detection and a timely response to faults. This presentation is on EMTP simulations that address these microgrid protection challenges.


New communication protocols for improved EMTP-RV connectivity with control, protection & monitoring systems, Vincent Lapointe, OPAL-RT

This presentation provides applications examples in which the use of EMTP-RV with communication protocols facilitates the development and testing of physical equipment, such slow controllers, whose temporal performance is little critical to intrinsic operation of the device. These same interconnection solution also pave the way for integration of third-party software for test automation, data storage, reporting and visualization of simulations performed with EMTP-RV. Some demonstrations will completed this presentation using OPC UA driver to interface SCADA application software

12:15 Buffet Lunch

Magnetization Data for Transformer Energization StudiesXuanchang Ran and Humberto Branco, Leidos Engineering

This presentation is on inrush current studies for single-phase transformers. The applications and modeling of such transformers are discussed. This presentation also focuses on the magnetization curve. The transformer test report data will be discussed and examined to understand how it impacts on analysis. The data points of voltage vs. current curve need to be extrapolated in some cases. Data extrapolation will be displayed and elaborated. A comparison between magnetization curves and impact on the second harmonic will be discussed.


Simulation and testing of transient overvoltage in the rail vehicle Industry, Maxime Berger, Bombardier

During the operation of DC rapid transit systems, rail passenger vehicles are subjected to transient overvoltage events that can seriously damage the on-board equipment. Each transit authority specifies the transient overvoltage requirements that the on-board equipment shall withstand. During the qualification testing phase, vehicle manufacturers must demonstrate the performance of both the equipment and the overall system under all specified voltage transients. However, at the design phase, equipment and system testing is not always available. Both the vehicle and the subsystems manufacturers must perform detailed analysis to ensure that the design will meet the transient overvoltage requirements. In response to these design challenges, an equivalent model of a transient laboratory setup including the equipment under test (EUT) has been developed and implemented in EMTP. It is used to replicate the testing conditions and the EUT behavior as well as to assess the overvoltage protective devices performance. Simulation results are compared to experimental data gathered during laboratory tests.

15:00 Coffee Break

EMTP-RV Studies for the Design of Static Var Compensators, Douglas Mader and Adam Sparacino, Mader Power Analytics

In the design of SVCs, the full suite of insulation coordination studies must be performed to determine proper electrical dimensioning of equipment in order to ensure long and reliable service life. While some studies such as those focusing on lightning and BIL are straightforward in their similarity to other substation projects, others including switching overvoltages and TRV and, in particular, temporary overvoltages require special consideration and the inclusion of control action in the simulation for proper assessment. Faults on the SVC medium voltage bus can challenge the TRV capability of the HV circuit breaker and can increase the probability of current chopping due to low-magnitude inductive currents. The presence of tuned harmonic filters and thyristor-switched capacitors requires study of amplification of slow front overvoltages and transient harmonic overvoltages arising from transformer energization and fault clearing events which must be considered not only in component ratings but in control-based protection settings and thyristor valve temperature and cooling design. This presentation will present the specific issues of concern and present examples of analyses on a real SVC design.


Nuclear Open Phase analysisMohit Malik, MPR


The usage of EMTP-RV at Sargent & Lundy.Sanjiv S. Shah, Sargent & Lundy


Analysis of transformer inrush transients in an offshore electrical system, Emmanuel Rutovic, Powersys Inc.

This project aimed to analyse the inrush transients and the associated voltage dips occurring in the power system of an offshore gas platform. The energization of transformers can cause significant inrush currents that can last for several seconds. In offshore systems, large transformers are generally connected to generators. Hence, there is an interaction between the generator voltage regulations and the voltage dip caused by the inrush transients. A specific attention is given to the modeling of the transformer saturation and to the regulation of the generators. An optimization algorithm is used to tune the generator models in order to have a good match between the simulated and measured responses.

16:45 Closing Remarks
17:00 End of the EMTP Users Group Meeting

* Conference information and program are subject to change without notice.