Sungrow has announced that all dynamic models of its inverters sold in Brazil have been officially approved by the country’s National Electric System Operator (ONS), the milestone confirming that the company’s products meet the strict compliance standards and accurately represent the dynamic behaviour during electromechanical and electromagnetic transients.
In August 2023, Brazil experienced a large-scale blackout that underscored the importance of accurate dynamic modeling for wind and solar power plants. The event brought attention to the need for greater confidence in the behaviour of inverter-based resources during system disturbances, particularly in scenarios involving reactive power support and low-voltage ride-through (LVRT) capability.
As a result, the ONS published a Report (RAP 0012/2023), launching a structured initiative to evaluate and verify the models of inverters and power plant controllers (PPCs), aiming to enhance the reliability and robustness of power system simulations.
In close coordination with the ONS, Sungrow inverters underwent extensive simulation and testing applying PSCAD for electromagnetic transients and ANATEM for RMS-based electromechanical transients, crucial for analyzing dynamic events like switching operations, faults and power electronics interactions. The processes were structured around two key stages, both of which posed significant challenges.
- Inverter Level 1 (L1): Sungrow validated its PSCAD model using a semi-physical controller to ensure alignment between simulation and actual hardware performance.
- Inverter Level 2 (L2): Based on the verified PSCAD model, an ANATEM model was developed and cross-checked to confirm consistency between the two platforms.
“ONS approval reinforces our commitment to delivering high-performance, grid-compliant solutions that contribute to the stability and modernization of Brazil’s national power system,” commented VP for Sungrow Americas Ada Li.
