Adaptive Droop Control Method for Grid-Forming Energy Storage Systems Based on Load Assessment
摘要
Droop control is widely adopted in Grid-forming energy storage systems (GFM-ESSs) for its frequency and voltage regulation characteristics, but when there is a deviation between the active power output and the setpoint of GFM-ESSs, it will lead to system frequency deviation from the rated value, thereby limiting the frequency regulation capability of GFM-ESSs. To address this issue, this paper proposes an adaptive droop control method for GFM-ESSs based on load assessment. This method injects active power disturbances to estimate the load under the rated frequency and adaptively adjusts active power setpoints of GFM-ESSs based on the assessment results. Simulation results demonstrate that in islanded mode, the proposed method enhances the frequency control accuracy and fully utilizes the frequency regulation capability of GFM-ESSs.