A Modified AGC for Power System in the Presence of Grid Following Inverters

Due to the significant growth of the penetration level of inverter-based resources in power transmission grids, the role and impact of these resources in maintaining the stability of the network can no longer be ignored. Therefore, for this category of resources, a role similar to traditional power plants should be considered in controlling the stability of the network. Accordingly, the purpose of this paper is to propose an algorithm to improve the performance of an automatic generation control system (based on a PI controller) in the presence of grid-following inverters to use their maximum potential and ability in network stability in the structure of an automatic generation control system and next to conventional power plants. Therefore, the decoupled-PQ control system (grid-following based) is considered for implementation in a three-area automatic generation control system structure. The dynamic simulation results were performed in an IEEE 39-bus test system using DIgSILENT PowerFactory software and its DSL environment. The results of these dynamic simulations show the effectiveness of this method to improve the automatic generation control system performance and system stability.