A voltage-frequency equivalent synchronous generator inverter and a control method thereof

Abstract

The application belongs to the technical field of power electronic converters, and discloses a voltage-frequency equivalent synchronous generator-like converter and a control method thereof. The converter comprises a three-phase MOSFET grid-connected inverter, an LCL three-phase filter, an energy storage capacitor, a synchronous generator-like control unit and a fast phase-locked grid-connected control unit. One end of an i-phase grid-connected inductor is connected with one end of an i-phase filter inductor and one end of an i-phase filter capacitor. The other ends of the three-phase filter capacitors are connected with each other, and i represents a, b or c. The AC side port of the three-phase MOSFET grid-connected inverter is connected with the other end of the three-phase filter inductor. The other end of the three-phase grid-connected inductor is connected with a power grid. The fast phase-locked grid-connected unit is connected with the synchronous generator-like control unit. The synchronous generator-like control unit is connected with the three-phase MOSFET grid-connected inverter. The application can keep the voltage control of the energy storage device unbiased, accurately control the output AC voltage and current, and improve the reliability and stability of the control system.

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