Control method of dual-port multi-level inverter

The invention discloses a control method of a dual-port multi-level inverter. The dual-port multi-level inverter comprises a grid-connected control module, an off-grid control module, a phase-locked loop module and a control mode switching module. According to the invention, the input and output power of the dual-port converter can be monitored in real time, and the real-time control of the dual-output-port multi-level inverter can be realized through a special phase-locked loop mode identification method and a control switching strategy. And the two output ports can independently work in a grid-connected state and an off-grid state, so that power balance and power distribution control of the multi-port power supply are realized. The control strategy can support efficient control of a high-density multi-port inverter power supply system, and is suitable for application occasions of renewable energy sources, energy storage and the like. 本发明公开了一种双端口多电平逆变器的控制方法，包括并网控制模块、离网控制模块、锁相环模块以及控制模式切换模块。本发明可通过对双端口变换器输入、输出功