Inverter regenerative braking method - Solutions - Huaqiang Electronic Network

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1. Energy consumption type:

In this method, a braking resistor is connected in parallel with the DC link of the inverter, and the switching of a power tube is controlled by detecting the DC bus voltage. When the DC bus voltage rises to about 700V, the power tube is turned on, and the regenerative energy is supplied to the resistor to be consumed as heat energy, thereby preventing the DC voltage from rising. Since the regenerative energy is not utilized, it is energy-consuming. The same energy consumption type, it differs from DC braking in that it consumes energy on the braking resistor outside the motor, and the motor does not overheat, so it can work more frequently.

2. Parallel DC bus absorption type:

Applicable to multi-motor drive systems (such as drafting machines). In this system, each motor needs one inverter, multiple inverters share one grid-side converter, and all inverters are connected in one share. DC bus. In this system, one or several motors are normally working in the braking state, and the motor in the braking state is dragged by other motors to generate regenerative energy, which is then absorbed by the motor in the electric state through the parallel DC bus. In the case of incomplete absorption, it is consumed by the shared braking resistor. The regenerative energy here is partially absorbed but not fed back into the grid.

3. Energy feedback type:

The energy feedback type inverter-side converter is reversible. When there is regenerative energy, the inverter can return the regenerative energy to the grid, so that the regenerative energy is fully utilized. However, this method requires high stability of the power supply, and once a sudden power failure occurs, inverter subversion will occur.