Technical Presentations

Lightning Overvoltages Transferred Through Power Transformers - EMTP® Simulations & Measurements880

Abstract
In this presentation, different wideband transformer models will be presented: extended BCTRAN model and black-box model based on measurements of frequency-dependent admittance matrix. These models ar... see moree validated using transferred overvoltages measured in high voltage laboratory. Afterwards, the results of the EMTP simulations of the lightning overvoltages are presented and compared to the onsite measurements at power transformer terminals.

Tag(s): Step-Up Transformer, Short-Circuit, Protection Schemes, Real-Time Implementation, Sensitivity Analysis

Onshore windfarm generic models and sensitivity analysis methods for harmonic studies881

Abstract
To facilitate the integration of renewable energy, RTE must connect new substations where multiple onshore wind power plants are connected at a distribution voltage level. These substations can be con... see morenected to the transmission grid with long underground cables, which can lead to harmonic amplification issues. To compensate for the lack of data on the distribution level of wind generators, RTE developed generic harmonic models for conducting harmonic studies and sensitivity analysis. This presentation will focus on the wind farm models, sensitivity analysis models, and results related to understanding which parameters influence harmonic amplification factors.

Tag(s): Renewable, Harmonic Analysis Studies, Sensitivity Analysis, Wind Power Plants

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

HVDC grid protection algorithm based on fault parameter estimation786

Abstract
This presentation focuses on voltage and current sensors modelling and its application on a transient based protection algorithm within a 4-terminal HVDC grid simulated in EMTP.

Fully selec... see moretive protection strategies for meshed HVDC grids need very fast DC fault identification and isolation which constitutes one of the main locks for large deployment of such grids. Transient based fault identification algorithms based on the modelling of the voltage and current traveling waves are seen as a promising solution to achieve fast fault identification. In addition, such algorithms are able to estimate the fault parameters such as the fault distance using local sensor data.As a model based approach, the accuracy of the sensors may impact the fault identification results as well as the precision of the estimated fault parameters.

In depth sensitivity analysis for different parameters of the sensor are carried out to outline the influence of the sensor characteristics on the fault identification results as well as the accuracy on the estimated fault parameters.