Introduction
The EMTP User Conference will take place at the Atlanta Marriott Marquis hotel on Thursday August 8th.
This event brings together power system experts, software users, EMTP marketing/support team and EMTP developers.
This meeting is a unique opportunity, for you to:
- Reconnect with industrial, research and academic members of EMTP community
- Share your insights and learn about the simulation of power system transients
- Stay up to date with the latest EMTP features
- Benefit from an update on EMTP latest features and share directly your thoughts and insights.
- Discuss your simulation problems with EMTP Application Engineers on site
- Exchange ideas and get inspired by peer’s success stories
AGENDA
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August 8th
USER CONFERENCE
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- 8.30 am: Meet & Greet / Attendee registration
- 9.00 am: Introduction | David Cottini, Powersys
- 9.30 am: EMTP developments and roadmap | Jean Mahseredjian, PGSTech
This presentation is for showing the upcoming developments and sharing the planned activities with software users. During this presentation the users can provide feedback to developers, request new models, features and discuss various issues related to the EMTP world. - 10.30 pm: Open Phase Analysis Using EMTP | Arihant Jain, Enercon An open phase event is characterized as a loss of one or two phases of the incoming power transformer supply with varying levels of impedance. The presentation explores techniques utilized to model the ancillary loads, induction machines, transformers, and modeling of the open phase fault condition. The presentation’s goal is to demonstrate the use of EMTP to model the existing protective devices to detect and protect against the effects of an open phase event and suggestions for observing key distinguishing parameters of an open phase event.
- 11.00 am: Coffee break
- 11.30 am: A Generic EMT-type Model for Wind Parks with Permanent Magnet Synchronous Generator type Full Size Converter Wind Turbines | Ulas Karaagac, Hong Kong Polytechnic University
Utilities are under considerable pressure to increase the share of wind energy resources in their generation fleet. With the increasing share of wind energy resources, the dynamic behavior of power systems will change considerably due to fundamental differences in technologies used for wind and conventional generators. There is very little standardization in the ways to model wind turbines (WTs) and wind parks (WPs) in sharp contrast to conventional power plants. Hence, there is an international interest to deliver generic models (i.e. standardized and publicly available) for WTs and WPs that are able to capture all performance aspects as good as manufacturer-specific models. This research developed an electromagnetic transient (EMT) simulation model for full size converter (FSC) WT based WPs that can be used for stability analysis and interconnection studies. The considered topology uses permanent magnet synchronous generator. Although the collector grid and the FSC WTs are represented with their aggregated models, the overall control structure of the WP is preserved. FSC WT and WP control systems include the non-linearities, and necessary transient and protection functions to simulate the accurate transient behavior of WPs. - 12.00 pm: Transient Studies for a Wind Plant Using EMTP | Bikash Poudel, Enernex EnerNex has been performing EMT analysis using EMTP-RV and its earlier versions since its inception for various projects such as switching studies, insulation co-ordination, integration of converter-based renewable energy and harmonic analysis. An example project that involved several transient studies for a wind plant is presented here.
- 12.30 pm: Lunch
- 1.30 pm: STATCOM Integration into a DFIG-based Wind Park for Reactive Power Compensation and its Impact on Wind Park High Voltage Ride-Through Capability | Ulas Karaagac, Hong Kong Polytechnic University
This research is on static synchronous compensator (STATCOM) integration into a doubly-fed induction generator (DFIG) based wind park (WP) in order to fulfill the grid code requirement for power factor control. The STATCOM impact on the WP high voltage ride-through (HVRT) capability is also analysed. The WP HVRT capability is assessed by analyzing the responses to a parametric voltage waveform. The external system is represented by a Thevenin equivalent. The pre-described voltage waveforms are applied to the Thevenin source in order to assess the conformity of the HVRT capability to Hydro-Quebec specifications. An actual WP is considered where the simulation model includes all details regarding collector grid and overvoltage protection. The simulations consider various wind turbine (WT) and medium voltage (MV) feeder outage scenarios as well as STATCOM usage for reactive power compensation. A transient function is also proposed for the STATCOM to improve the WP HVRT capability. The simulation results demonstrate that, STATCOM usage provides a noticeable improvement in HVRT capability of the WP, especially with the proposed transient function. - 2.00 pm: A Project to Correct Mill Power Factor | Christopher Burnett, ABB 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.
- 2.30 pm: Modeling of GMD Related Reactive Power Losses | Bob Aritt, EPRI SDuring a geomagnetic disturbance (GMD), low-frequency (0.1Hz or lower) geomagnetically-induced currents (GICs) can cause directional saturation in high voltage transformers causing increased transformer reactive power losses. A detrimental impact of this increased reactive power loss is potential voltage regulation problems and in severe cases, voltage instability and power system blackout. Modeling the additional reactive losses in each transformer due to directional saturation is a key assumption that directly influences the system GMD vulnerability assessment results. One relationship that is commonly used in relating effective GIC to reactive power losses is provided by the “k-factor.” The k-factor responses of different transformers can vary. The goal of this presentation is to illustrated a better understanding of the k-factor through the use of EMTP-RV modeling.
- 3.00 pm: Coffee break
- 3.30 pm: Investigation of the impact of inverter-based resources on the performance of legacy protection schemes | Evangelos Farantatos, EPRI SThe integration of inverter-based resources (IBR) (predominantly renewables) 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 their fault response is not similar to conventional synchronous or asynchronous rotating machines, since it is governed by the converter controls. A major research question is the performance of legacy protection schemes in systems with high levels of IBRs, and potential relay misoperations which will compromise the reliability of the grid. An understanding of the way the fault response of IBR affects the various system protection schemes is needed, to identify potential vulnerabilities that protection and planning engineers can take into account when designing protection schemes and setting relays. This presentation investigates the impact of increased levels of IBR on the performance of legacy protection schemes and on conventional methodologies that planning and protection engineers use to conduct relay setting and protection coordination studies. The goal is to identify which protection schemes are prone to misoperation, analyze their vulnerabilities, and provide guidelines and recommendations to protection engineers when performing protection studies on systems with IBR that will ensure the efficiency of the existing protection schemes or suggest new ones.
- 4.00 pm: Sub-synchronous oscillations with type 3 wind turbines and MMC-HVDC | Anton Stepanov, Polytechnique Montréal Sub-synchronous oscillations is an undesirable phenomenon in power systems. It is associated with the energy exchange between different elements of the system. Power electronics-based devices, such as windfarms and AC/DC converters are also prone to such oscillations. In this presentation, a case of sub-synchronous oscillations between type 3 wind turbines and MMC-based HVDC transmission is demonstrated and analyzed using EMTP.
- 4.30 pm: The validation of field measured switching overvoltages, inclusion of statistical prestrike and corona modeling | Ilhan Kocar, Polytechnique Montréal This presentation is on the simulation of switching overvoltages on transmission lines with trapped charge, validation of EMTP line models, modeling of prestrike in statistical simulation studies and discussion of necessary simulation practices by means of validations with field tests. On transmission lines where switching surges are not mitigated with closing resistors and/or surge arresters, high-speed reclosing on a line with trapped charge will produce high overvoltages that have been measured above 3 pu. Careful simulations of these switching events using available Electromagnetic Transient (EMT) programs consistently produce significantly higher voltages than the measurements. It is demonstrated that the transient voltage waveforms can be reproduced very well using frequency-dependent line models, but the magnitude of the maximum overvoltage is significantly overestimated unless the effect of corona is considered. In principle, once a line model is validated, it is possible to proceed with statistical simulation phase to identify the worst-case overvoltage, which is of utmost importance for transmission line and substation related issues such as the evaluation of minimum approach distance and clearance practices. However, before proceeding with statistical simulation phase, it is also necessary to tune the prestrike model in EMTP. In this presentation, we also discuss how to benefit from field tests to fine tune the generic prestrike model in EMTP and then how to proceed with statistical simulation studies while taking corona into account in an efficient manner.
- 5.00 pm: Open Q&A
- 8.30 am: Meet & Greet / Attendee registration
VENUE
MARRIOTT MARQUIS
Conference room 104
265 Peachtree Center Avenue
Atlanta, GA 30303
USA
SPEAKERS
Robert F. Arritt
Bob Arritt is a Technical Executive at the Electric Power Research Institute (EPRI). His current research activities include leading the geomagnetic disturbance work, distributed resources, system transients, harmonics and protection. Mr. Arritt joined EPRI in 2007. Prior to joining EPRI, Mr. Arritt worked for Raytheon in Sudbury, MA where he worked in the Power and Electronic Systems Department. At Raytheon he was awarded the 2006 Raytheon Technical Honors Award for Peer and Leadership Recognition for Outstanding Individual Technical Contribution and also received a 2005 Raytheon Author’s Award for design of a Phase-Shifted Transformer for Harmonic Reduction. Since at EPRI, Bob has been awarded the Chauncey Award for his outstanding innovative and achievements in science and technology. Mr. Arritt holds a US Patent as the lead inventor for “Method for Detecting an Open-Phase Condition of a Transformer.” Mr. Arritt has authored several technical papers and is a Senior member of the Institute of Electrical and Electronics Engineers (IEEE). Mr. Arritt received a BS, magnum cum laude, in electrical engineering from West Virginia Institute of Technology in Montgomery, West Virginia. He received a MS degree in electrical engineering from Worcester Polytechnic Institute in Worcester, Massachusetts. Mr. Arritt is a Professional Engineer, licensed in the State of Tennessee.
Christopher G. Burnette
Mr. Burnette graduated from Clemson University with a BSEE degree in 1990, and with an MSEE degree in 1992. His graduate school studies included laboratory research into the effects of harmonic distortion on the accuracy of solid-state revenue meters, which was funded by a consortium of electric utilities. Upon graduation, Mr. Burnette began his professional career as a Corporate Engineer with a large electric utility where he performed some of the first computer-based power system studies for the utility’s aging power plant fleet. Later, he moved into private industry where he worked as a Power Systems Engineer & Consultant. Mr. Burnette is a registered Professional Engineer in multiple states, and is currently employed with ABB Americas, Inc.
Evangelos Farantatos
Evangelos Farantatos received the Diploma in Electrical and Computer Engineering from the National Technical University of Athens, Greece, in 2006 and the M.S. and Ph.D. degrees from the Georgia Institute of Technology, Atlanta, GA, USA, in 2009 and 2012, respectively. He is a Senior Project Manager with the Grid Operations and Planning R&D Group at EPRI, Palo Alto, CA. He is managing and leading the technical work of various R&D projects related to renewable energy resources modeling, DER integration, grid operation with high levels of inverter based resources, synchrophasor technology, power systems monitoring and control, system protection, power systems stability and dynamics. He is a Senior Member of IEEE. In summer 2009, he was an intern at MISO.
This event is organized by EMTP Alliance. For any questions, please contact us.
