Secondary-Frequency and Voltage-Regulation Control of Multi-Parallel Inverter Microgrid System

As an important form of distributed renewable energy utilization and consumption, the multi-parallel inverter microgrid system works in both isolated grid-connected operation mode. Secondary-frequency voltage-regulation control are very solving problems that appears these systems, such as secondary-frequency regulation real-time scheme, voltage reactive power balancing, under disturbances unbalanced conditions a system. This paper introduces key technologies related to issues, consensus algorithm event-triggered technique, dynamic adaptive virtual impedance robust self-anti-disturbance technique. Research design methods small-signal state-space analysis, Lyapunov function method, analysis μ-synthesis design, LMI matrix method adopted solve issues regulation. number inverters increases, structure becomes more complex. Suggestions prospects for future research provided realize with low-communication technology scheme. Finally, case study, droop-control model primary frequency/voltage deviation is analyzed, loop established. Then, quantitative relationship between active output discussed. The centralized decentralized methods, based on mechanism, equalization, distribution, stability multiple parallel regarding analyzed.