2025 EMTP International User Conference

The EMTP^® development team is introduced, along with the program schedule and a brief history of EMTP^®. Also, attendees will have the chance to learn about upcoming software developments, provide feedback to developers, request updated modules, features, and discuss EMTP-related issues.

The paper presents simulations of a new test on HVDC cables involving a superimposed impulse voltage test, where the EMTP model was validated against real measurements taken in an HV laboratory. Additionally, simulations of very slow temporary overvoltage (TOV) on HVDC cable are shown, aiming to verify whether the existing impulse generator provides sufficient energy, given the challenge of prolonged test duration. Another similar simulation example illustrates a combined heat and basic impulse level (BIL) test, used to assess the energy capability of the impulse generator. Beyond its application in validating new test requirements and configurations in the HV lab, EMTP can also be used for the development of novel testing methods, such as the low-frequency signal injection method for earth-fault detection, where the simulation results were also validated with real-world measurements.

In Mexico, the Código de Red sets out the technical requirements that generation plants—whether conventional or renewable—must comply with to connect to the national electric grid. These requirements include tasks related to the control of active and reactive power, voltage, and frequency; all aimed at keeping the system stable and reliable. Among these, reactive power regulation is particularly important, as it directly affects compliance and the overall quality of grid interaction. This work is divided into two parts. The first looks at how EMTP simulations can help detect reactive power regulation issues in a wind farm, using real data obtained from power quality meters installed on-site. These measurements serve as input for the simulations, allowing a better understanding of the behavior of the plant during grid disturbances. The second part focuses on developing a modulation and control strategy for a MMC-STATCOM based on a blackbox model, analyzing its response under specific operating scenarios.

The Gaspésie network is a regional part of Hydro-Québec’s grid that feeds a small amount of load over a vast region. It is radially connected to the 735 kV grid by long series compensated 315 kV lines. The Gaspésie network is considered as a weak grid as the short-circuit level and the inertia in the region are very low. Furthermore, the Gaspésie network integrates 2250 MW of wind generation, 775 MW of back-to-back line-commutated converters (LCC) and a winter peak local load of 1200 MW. The EMTP study aimed to evaluate the operational transmission capacity of a main link of the Gaspésie network and compare them with current operating limits established with PSSE simulations. The transmission capacity was determined by simulating high impact single contingencies in different topologies and operating conditions. Operational transmission capacities are established to control the loss of wind production and the transient voltage recovery profile, during and after an event.

Ampere Consultoría Eléctrica Mexicana, S.A. de C.V. develops mathematical models in the EMTP^® software to evaluate the performance and regulatory compliance of Photovoltaic Power Plants. A detailed model of the power plant is developed, enabling the analysis of its dynamic behavior under various operating conditions. In compliance with the Mexican Grid Code, various simulations are performed as evidence of regulatory compliance, including but not limited to the following: Mathematical model initialization: The proper functioning of the elements that make up the power plant model is verified, ensuring that no power or voltage disturbances occur during its operation. Active power control test. Reactive power control test. Power factor test. Voltage control test. Analysis of the power plant's behavior under frequency deviations: The primary regulation and response to high and low-frequency conditions are evaluated according to the requirements established in the Mexican Grid Code.

Details will be available soon.

The simulation of Electromagnetic Transients (EMTs) of a large-scale network such as the French Transmission Grid is quite challenging. This network comprises more than 70 000 electrical nodes representing all voltage levels: 400 kV, 225 kV, 90 kV and 63 kV. Such a large network poses challenges both in building the model and achieving reasonable simulation times. Two solutions are proposed for data modelling and computation time. For data modelling, the Common Information Model (CIM) standardized format is used to import data from a planning tool into an EMT simulation. New enhancements are proposed for this automatic CIM/EMT interface. To reduce computation time, a sparse linear solver with partial refactorization and parallelization is employed. It further improves simulation performance, particularly in the solution of nonlinearities with substantial speedups.

Details will be available soon.

Achieving interoperability in multi-vendor HVDC systems is a key enabler for the efficient integration of offshore wind power into the European grid, supporting the EU’s objective of climate neutrality by 2050. This session will begin with a brief overview of the project's objectives and main challenges, followed by a presentation of the Real-Time Demonstrator and the proposed process for interaction studies. The focus will then be placed on the role of EMT simulations in both HVDC grid design and interaction studies, highlighting the importance of defining suitable requirements for offline and HIL models, as well as for the simulation platforms.