Fast Voltage Stabilization Control of Split DC Bus Midpoint in 3P4W Shunt APFs

Abstract

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Sensorless Neutral Point Voltage Stabilization in Three-Phase Four-Wire Converters

“…The MVB operates in open loop with a fixed duty cycle and fixed switching frequency. The neutral inductance is half compared to that in [6]. Nevertheless, same inductor current ripple is maintained due to coupling.…”

“…Popular configurations of 3P4W converters are the split dc bus (2-C) [3], the four-leg converter (4-Leg) [4], the actively control split dc bus (ACSB) [5] , and the midpoint voltage balancer (MVB) [6]. The 2-C configuration is easy to implement.…”

“…The MVB configuration proposed in [6] doubles the neutral current handling capability of the 3P4W GCC by adopting dual switching legs, as shown in Fig. 1.…”

“…In this paper, the control strategy of the MVB is redesigned to allow sensorless neutral point voltage stabilization in the 3P4W converter. This approach is considered as a cost-effective alternative to the MVB proposed in [6]. It provides majority of the advantages existed in its predecessor, while it requires no information on neutral inductor currents, split dc bus voltages, nor neutral current.…”

Continuous finite‐time control of four‐leg inverter through fast terminal sliding mode control

“…However, this solution is not feasible in transformerless applications. Another solution is the split‐Link four‐wire inverter in which the fourth wire is connected to the midpoint of the DC‐Link . Although this structure offers simplicity as well as using fewer power semiconductors, it mainly suffers from precise voltage balancing between split capacitors.…”