Power Converter Dynamic Dead Band Control

The dead band width is made dynamically adjustable based on the magnitude of the active current. When the active current is large, the dead band width is reduced or eliminated, allowing the reactive current to naturally approach zero and improving conversion efficiency. When the active current is small, the dead band width is increased to maintain DC voltage balance and prevent reactive current direction switching. This dynamic adjustment resolves the contradiction between maintaining voltage balance and improving efficiency.

The control method changes the parameter of dead band width according to the operating conditions (active current magnitude). By adjusting the dead band parameter dynamically rather than keeping it fixed, the system adapts to different load conditions, maintaining voltage balance when needed while minimizing unnecessary reactive power output when not needed, thus resolving the efficiency problem.

The dead band width is dynamically adjusted based on the active current magnitude. When reactive power is small and active current is large, the dead band is reduced or eliminated, allowing smooth reactive current control without direction switching issues. When reactive power control is critical and active current is small, the dead band is increased to prevent direction switching and maintain voltage balance. This dynamic approach allows the system to adapt to different operating conditions.

The control parameter (dead band width) is changed according to the operating state of the system. By monitoring the active current and adjusting the dead band parameter accordingly, the system maintains adaptability in reactive power supply while ensuring DC voltage balance is maintained when reactive current is small, thus resolving the contradiction between adaptability and reliability.