Điều khiển bộ biến đổi công suất trong hệ thống các nguồn điện phân tán

Microgrids, especially hybrid AC/DC configurations, are increasingly vital for integrating diverse renewable energy sources and enhancing grid resilience. Effective power management and sophisticated control strategies are crucial to maintaining stability and ensuring reliable power delivery within these complex systems, particularly when managing bidirectional power flow and varied load types. While existing research often addresses pure AC or DC microgrids, a comprehensive solution for hybrid setups remains a significant challenge. This paper proposes a robust power control method for the Interlinking Converter (IC) in hybrid AC/DC microgrids operating in islanded mode, aiming to ensure stable voltage and frequency, balance active and reactive power, and enhance fault recovery capabilities in both AC and DC sub-grids.

Researchers and engineers in power systems, renewable energy, microgrids, and control engineering, particularly those focused on hybrid AC/DC systems and distributed generation.

This academic paper addresses the critical challenge of power control in **hybrid AC/DC microgrids**, which are becoming increasingly prevalent due to their ability to integrate various **distributed generation** sources and loads efficiently. The core logic revolves around the bidirectional power flow management facilitated by an **Interlinking Converter** (IC) operating in an isolated **microgrid**. The proposed method utilizes an advanced droop control strategy (P/f-Q/Vac for AC and P/Vdc for DC sub-grids) alongside a PI controller to maintain the stability of **voltage and frequency control** across both AC and DC buses. The research details the architectural structure of such a microgrid, emphasizing the dynamic interaction between AC and DC sub-grids. The methodology specifically focuses on regulating active and reactive power to ensure stable operation and enhance the microgrid's resilience against sudden load changes or power source failures. Key components of the control strategy include power measurement, droop control for the IC, and voltage/current control loops, complemented by Space Vector Pulse Width Modulation (SVPWM) for efficient **power converter control**. The practical application value of this approach lies in its potential to significantly improve the reliability and flexibility of hybrid microgrids. Simulation results, conducted using Matlab/Simulink, validate the effectiveness of the proposed control scheme in two critical scenarios: enhanced recovery of AC voltage regulation during an AC sub-grid fault and improved DC voltage regulation during a DC sub-grid fault. These findings demonstrate the system's ability to swiftly restore stability and balance power flow, even under challenging operational conditions, thereby enhancing the overall performance and robustness of these **microgrid power control** systems.