Abstract : This paper introduces a scheme for using a general-purpose frequency converter in a multi-drive system, which replaces the shared DC bus. In a drive system, regenerative energy is frequently generated. Multiple frequency converters are interconnected via a DC bus, allowing the regenerative energy generated by one or more motors to be consumed and absorbed by other motors via electric power-driven mode (Electric Power-Driven Mode). This is a very efficient operating method. If an energy feedback device is used, the remaining regenerative energy on the DC bus can also be directly fed back to the power grid. This paper also introduces the application of this scheme in centrifuges, chemical fiber equipment, and paper machines. Keywords : Multi-drive system, general-purpose frequency converter, shared DC bus, regenerative energy, energy feedback device [b][align=center]Design and Application of the Scheme on Shared DC Bus for General Frequency Converters Li Fangyuan[/align][/b] Regenerated energy is frequently produced, but with multi-converters interconnected through a shared DC bus, the regenerated energy produced by one or more motors can be absorbed and consumed by other motors in electric power-driven mode. This is an effective working mode. If an electric energy feedback unit is applied, the remaining regenerated energy on the common DC bus can be fully fed back to the power network. Moreover, the applications of this scheme in centrifugals, chemical fiber equipment, and paper machines are introduced. Keywords: Multi-drive System; General Frequency Converter; Common DC Bus; Regenerated Energy; Electric Energy Feedback Unit In motor drives, the phenomenon of regenerated energy frequently occurs. This paper proposes a practical general-purpose frequency converter DC bus scheme and elaborates on its further applications in centrifugals, chemical fiber equipment, and paper machines. 0 Introduction In the same electric drive system, one or more drives may sometimes have energy generated at the motor end fed back to the frequency converter of the drive. This phenomenon is called "regenerated energy." This situation typically occurs when the motor is being dragged (i.e., dragged at a speed far exceeding the set value), or when the drive motor brakes to provide sufficient tension (such as the drive motor in an unwinding system). Traditional PWM inverters are not designed to feed regenerative energy back to the three-phase power supply; therefore, all energy absorbed by the inverter from the motor is stored in electrolytic capacitors, ultimately leading to an increase in the inverter's bus voltage. If the inverter is equipped with a braking unit and braking resistor, the inverter can dissipate the energy as heat by briefly switching on the resistor. Of course, as long as the maximum current capacity during braking, the load cycle, and the rated power consumed by the braking resistor are fully considered, a suitable braking unit can be designed to dissipate energy continuously, ultimately maintaining the balance of the bus voltage. This braking unit's operation is essentially a form of energy dissipation. [b][align=center]For more details, please click: Design and Application of a Common DC Bus Scheme for General-Purpose Inverters[/align][/b]