Inverter regenerative braking method - Solutions - Huaqiang Electronic Network

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1. Energy Consumption Type:

This method involves connecting a braking resistor in parallel with the DC link of the inverter. The power switch is controlled by monitoring the DC bus voltage. When the voltage reaches approximately 700V, the power transistor is activated, allowing the regenerative energy to be dissipated as heat through the resistor, which helps prevent the DC voltage from rising further. Since this method does not utilize the regenerated energy, it is classified as an energy-consuming type. Unlike DC braking, where energy is dissipated within the motor, this approach uses an external braking resistor, reducing the risk of motor overheating and enabling more frequent operation.

2. Parallel DC Bus Absorption Type:

This technique is commonly used in multi-motor drive systems, such as in drafting machines. Each motor requires its own inverter, but multiple inverters share a single grid-side converter, and all are connected to a common DC bus. During normal operation, some motors may enter a braking mode, generating regenerative energy that is absorbed by other motors operating in the motoring state through the shared DC bus. If the energy cannot be fully absorbed, it is then dissipated through a shared braking resistor. This method allows partial utilization of regenerative energy but does not return it to the grid.

3. Energy Feedback Type:

The energy feedback type uses a reversible inverter-side converter that can return regenerative energy back to the power grid, maximizing energy efficiency. However, this system requires a stable power supply. In the event of a sudden power failure, the inverter may experience a reversal or malfunction, making it less reliable under unstable conditions. Despite this limitation, it is considered one of the most efficient methods for managing regenerative energy in industrial applications.