A three-phase inverter control device and method based on virtual output impedance

Abstract

The invention discloses a three-phase inverter control device and method based on virtual output impedance, which is characterized in that it includes a three-phase inverter main circuit, a switch for grid connection, a grid module, and a current measurement module; Including output virtual active power calculation module, output virtual reactive power calculation module, modulation signal calculation module, modulation module, frequency-active power droop control adjustment module, voltage-reactive power droop control adjustment module, power conversion calculation module, inverter The output voltage phase of the generator is synchronized with the grid phase adjustment module, the output virtual voltage phase calculation module, the output virtual voltage amplitude calculation module and the virtual voltage synthesis module. The beneficial effects achieved by the present invention: the present invention realizes the operation of single and multiple inverter parallel systems in the grid-connected mode and the off-grid mode, and realizes the seamless switching function of the off-grid and grid-connected modes, ensuring the inverter The inverter system operates safely and reliably.

Description

Technical field [0001] The invention relates to a three-phase inverter control device and a method thereof, in particular to a three-phase inverter control device and a method based on virtual output impedance. Background technique [0002] With the increasingly prominent global energy crisis and environmental problems, distributed power generation technology and microgrid technology have received more and more attention, as the link between distributed resources and the distribution network (microgrid), grid-connected inverter The function of the generator has been deeply excavated and its beneficial effect has been affirmed, but the challenge that conventional control strategy itself brings to the safe and stable operation of distribution network and microgrid cannot be ignored. In particular, conventional grid-connected inverters have fast response speeds, are difficult to participate in grid regulation, cannot provide necessary voltage and frequency support for active distrib...

AI Technical Summary

Problems solved by technology

[0002] With the global energy crisis and environmental problems becoming increasingly prominent, distributed power generation technology and micro-grid technology have received more and more attention. As the link between distributed resources and distribution network (micro-grid), grid-connected inverter The function of the controller has been deeply excavated and its beneficial role has been affirmed, but the challenges brought by the conventional control strategy itself to the safe and stable operation of the distribution network and microgrid cannot be ignored.

In particular, the conventional grid-connected inverter has a fast response speed and is difficult to participate in grid regulation. It cannot provide the necessary voltage and frequency support for the active distribution network with distributed power, let alone provide the necessary support for the relatively poor stability of the micro-grid. Damping effect, lack of an effective "synchronization" mechanism with the distribution network and microgrid

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