Flexibilities of a Voltage Support Control Strategy for Grid-Connected Inverter-Interfaced Distributed Generators during Voltage Sags

• Published in: 2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) pp. 645 - 650
• Main Authors: Moreno, Ingrid J., Mantilla, Maria A., Esparza, Astrid, Rey, Juan M., Rincon, David J.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 09.06.2023
• Subjects: Codes; Flexible control strategy; Generators; inverter-interfaced distributed generators; Inverters; Low voltage; low-voltage ride-through (LVRT); maximum rated current; Power quality; Power system stability; Reactive power; voltage sag; voltage support
• ISSN: 2329-5767
• DOI: 10.1109/PEDG56097.2023.10215232

Modern grid codes require that inverter-interfaced distributed generators include a low voltage ride-through (LVRT) capability to remain connected to the grid and provide voltage support when a sag occurs. To implement this capability, flexible control strategies are widely considered since they allow the achievement of different control objectives by correctly setting some control parameters. This paper presents a generalization of a flexible control strategy to provide voltage support during voltage sags using the maximum inverter power capability. The strategy considers four control parameters whose variation results in different voltage support capabilities. Consequently, an algorithm that allows to identify the support capabilities and the operating characteristics of the system according to the variation of the control parameters is presented. Simulation studies are performed on Matlab to validate the analysis.