How to balance capacitor voltages of Phase B and Phase C?

The proposed offset balancing method and the suggested switching order are decoupled compensating the phase shift error. As a result, phase b and phase c capacitor voltages are balanced. Therefore, the capacitor voltages of phase b and phase c are balanced. In this state, uca1 = uca2, ucb1 = ucb2 and ucc1 = ucc2. Fig. 13.

How can a three series capacitor be used as a current sharing strategy?

Applying the charge balance principle for three times, through the three series capacitors, the current sharing strategy can be obtained. Then applying the inductor volt-second balance to get the constraint conditions of the four times voltage gain.

How to determine the charge balance of a phase-K series capacitor?

It can be observed that in any operating mode, the charge balance of the phase-K series capacitor is only determined by the current through the phase-1 to phase-K + 1 phase, in which the current of phase-1 to phase-k act on the capacitor for charging and the current of phase-K + 1 acts on discharging.

What is a feedback control in a capacitor?

A feedback control is employed in the capacitor's voltage balance technique to account for the voltage discrepancy. The compensation signals will be regulated by PI compensators and added to the modulation signals by comparing the voltage on each capacitor with the reference voltage .

What is a capacitor voltage balancing strategy with n-capacitors in series?

A capacitor voltage balancing strategy with n -capacitors in series should be devised. It should develop from the balancing strategy of two capacitors in series. The influence of the switching sequence should be investigated also. Lijun Zhang: Writing – original draft, Writing – review & editing, Conceptualization, Methodology, Validation.

What is phasor locked loop in a three-phase AC/DC converter?

In this chapter, a mathematical model of the power circuit of a three-phase AC/DC converter is developed in the stationary and synchronous reference frames. Then, the operation principle of the phasor locked loop is addressed to exact the angle information of the power grid to realize the accurate control synchronized with the power grid.