Centralized Virtual Synchronous Control Scheme of Wind-photovoltaic-storage DC Microgrid

Aiming at the lack of efficiency and accuracy of the existing virtual synchronization control based on DC microgrid, a centralized virtual synchronization control applied to inverter connected to common DC bus of DC microgrid is proposed. The mathematical models of power balance, phasor relationship, volt-ampere characteristic and power characteristic of the system are derived. The feedforward virtual speed control and feedforward virtual voltage regulation control are designed to generate optimal active and reactive power instruction corrections, respectively. A complete centralized virtual synchronous control structure is established by combining the rotor movement and voltage reactive power regulation control links of the system. The remarkable control efficiency and precision of the proposed control scheme are verified by numerical simulation.