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Communication Dans Un Congrès Année : 2023

Comparative analysis of Grid Forming Inverters based power systems in Phasor Domain and Electromagnetic Transient Domain

Résumé

DERs-based microgrids have become more popular due to the development of power inverters in terms of costs, performance and power rates. Those in service today are predominantly following the grid voltage and frequency references measured locally and inject current based on power set points (Grid Following). New challenges are arising with fewer Synchronous Generators and more inverters based resources (IBRs) mainly due the negative effect of these latter on the reliability of power systems. As a solution, the grid forming (GFM) structure was proposed to deliver more supporting services to the grid and improve the participation of IBRs in the reliability of power system. In the past, many assumptions have been made to simulate power systems due to the gap between phasor domain and detailed Electromagnetic Transients (EMT) studies. The main differences between these two models are in the modelling accuracy for transient events and the associated computational cost. Simulating a bulk system dominated by Synchronous Generators have been widely carried out with Phasor models. However, with the large integration of IBRs, controllers become faster and the dynamic behaviour of inverters cannot be neglected. As a result, an overlap between AC transients and inverters response to disturbances appears and must be studied. The question of which type of model to use to simulate a phenomena needs to be addressed. By two case studies, an analytical comparison of the Phasor (PM) and EMT models of a Grid forming inverter-based system was realized. Both models were built on Matlab/Simulink software. The first case study compares the two models of the GFM inverter in a small microgrid composed of several DERs and loads. The second case asses the behaviour of the GFM inverter connected to a strong grid. The control implemented for the GFM inverter is a hierarchical control based on an external Droop control loop, an internal voltage and current control, which generates the inverter reference voltages. A set of events of different natures was applied in both cases such as, active and reactive load demand change, phase-to-phase short circuit, three-phase short circuit, motor start, connection to the grid and islanding. The different simulations are evaluated on numerical criteria, such as execution time, minimum time step and accuracy. The first results showed that the PMs have difficulty in reflecting the fast responses of the GFM inverter when it comes to a severe short-term event. In contrast, for events related to the change in power demand, EMT and PM merge. The accuracy of EMT models is relatively higher; however, their total time execution is considerably higher than phasor simulations.
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Dates et versions

cea-04644949 , version 1 (11-07-2024)

Identifiants

  • HAL Id : cea-04644949 , version 1

Citer

Saïd Daoudi, Thai-Phuong Do. Comparative analysis of Grid Forming Inverters based power systems in Phasor Domain and Electromagnetic Transient Domain. 2023 IEEE PES ISGT Europe 2023 - IEEE PES Innovative Smart Grid Technologies Europe, Oct 2023, Grenoble, France. pp.A9096SD. ⟨cea-04644949⟩
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