Inverter and control method thereof

Abstract

The invention provides an inverter and a control method thereof. The inverter is characterized in that a DC / DC circuit comprises a first boosting branch and a second boosting branch which are connected in parallel; and switching pieces in the first boosting branch and the second boosting branch are controlled by a controller. The configuration and control method of the controller are as follows: afirst voltage outer loop adjusting unit is configured to calculate and output a direct-current bus current expected value according to a direct-current bus voltage expected value and a direct-currentbus voltage real-time value; a first current inner loop adjusting unit is configured to calculate and output a control signal of the first boosting branch according to a direct-current bus current expected value and the chopping current of the first boosting branch; and a second current inner loop adjusting unit is configured to calculate and output a control signal of the second boosting branchaccording to the direct-current bus current expected value and chopping current of the second boosting branch. The DC / DC circuit of the inverter system adopts a double-path parallel boost chopper circuit, so that the high boost transformation ratio of the inverter under low-voltage input can be realized, and the low-voltage loading capacity of the inverter is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an inverter and a control method for the inverter. Background technique [0002] The inverter is the core component of the power supply system. [0003] According to the change of power supply demand, the requirements for the load capacity, anti-interference performance and stability of the inverter are constantly increasing. Taking the train emergency ventilation system as an example, the inverter is used to supply power to the fan inside the air conditioner outside the train when the power supply failure of the subway vehicle occurs. In an emergency state, the inverter system needs to make a timely and stable response. In terms of hardware structure, traditional inverters generally have poor load performance under low-voltage input, cannot achieve high-efficiency load operation, and the inverter output voltage has poor anti-load disturbance performance. Low-level d...

AI Technical Summary

Problems solved by technology

In terms of hardware structure, traditional inverters generally have poor load performance under low-voltage input, cannot achieve high-efficiency load operation, and the inverter output voltage has poor anti-load disturbance performance. Low-level defects, room for improvement

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