Access to EMTP user presentations, webinars, and slide deck presentations.
Author(s): Ulas Karaagac
Type:Technical Presentation
Date: 2020-12-11
Abstract
<p>This presentation presents a research on static synchronous compensator (STATCOM) integration into a doubly-fed induction generator (DFIG) based wind park (WP) in order to fulfill the... see more grid code requirement for power factor control. The STATCOM impact on the WP high voltage ride-through (HVRT) capability is also analysed.</p><p>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.</p>
Author(s): Anton Stepanov
Type:Technical Presentation
Date: 2020-12-11
Abstract
<p>Sub-synchronous oscillations are an undesirable phenomenon in power systems. It is associated with the energy exchange between different elements of the system. Power electronics-base... see mored 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.</p><p>
Overview: - Introduction - System overview - SSO demonstration - Analysis – Conclusions</p>
Author(s): Ilhan Kocar, Polytechnique Montréal
Type:Technical Presentation
Date: 2020-11-20
Abstract
<h2 class="title">EMTP USA User Conference 2019 </h2> <p class="tagline"><b>The validation of field measured... see more switching overvoltages, inclusion of statistical prestrike and corona modeling</b></p> <p id="text-intro">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.</p>
Author(s): Anton Stepanov, Polytechnique Montréal
Type:Technical Presentation
Date: 2020-11-20
Abstract
<h2 class="title">EMTP USA User Conference 2019 </h2> <p class="tagline"><b>Sub-synchronous oscillations wit... see moreh type 3 wind turbines and MMC-HVDC</b></p> <p id="text-intro">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.
Author(s): Bjorn Gustavsen, SINTEF Energy Research
Type:Technical Presentation
Date: 2020-11-20
Abstract
<h2 class="title">EMTP Europe User Conference 2019 </h2> <p class="tagline"><b>The EMTP User Conference pres... see moreentations are now available online!</b></p> <p id="text-intro"><b>Inclusion of a White-Box Transformer Model in EMTP</b><br> Transformer manufacturers make use of detailed (white-box) transformer models for calculating internal voltages during the lightning impulse test. Such white-box models could also be utilized in general transient simulation studies. This presentation describes the inclusion of one white-box model in EMTP using DLL code. The resulting model is highly efficient and it can be used to study internal overvoltages in the transformer during network transients, e.g. swithing operations and lightning strokes. The visualization of internal voltages is achieved by a matlab-based tool.
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