Energy Control of Grid-Connected Microgrid with ADRC

In the control of microgrids, renewable energy generation exhibits intermittency and uncertainty in user electricity consumption. Directly connecting such systems to the main power grid without energy control may result in significant disturbances. This design proposes a method for suppressing active power disturbances and compensating for reactive power. Voltage and current signals at the point of connection to the main grid are collected, and the Active Disturbance Rejection Control (ADRC) algorithm is employed to regulate the active and reactive power output of the battery grid-connected inverter. This enables the local microgrid system to absorb or dispatch active power to or from the main grid, based on user settings or virtual power plant dispatch instructions. Meanwhile, the reactive power within the entire microgrid user system is compensated, reducing the system's reliance on reactive power from the main grid. This achieves compensation for active and reactive power within the regional microgrid. Simulation results demonstrate that the ADRC controller effectively suppresses disturbances such as generation and load variations across the system. Additionally, it achieves the target output power values at a fast response rate.