Abstract
This paper proposes a control algorithm for a hybrid power electronic AC/DC converter for prosumer applications operating under deep phase current asymmetry. The proposed system allows independent control of active and reactive power for each phase of the power converter without current pulsation on the DC link connected to an energy store. The system and its algorithm are based on a three-phase converter in four-wire topology (AC/DC 3p-4w) with two dual-active bridge (DC/DC) converters, interfaced with a supercapacitor and an energy storage. The control algorithm tests were carried out in a Hardware in the Loop environment. Obtained results indicate that operation with deep unbalances and powers of opposite signs in individual phases leads to current oscillations in the DC link. This phenomenon significantly limits energy storage utilization due to safety and durability reasons. The proposed algorithm significantly reduces the level of pulsation in the DC link which increases safety and reduces strain on lithium-ion storage technology, enabling their application in four-wire converter applications.
Highlights
Four-Wire Inverter during PhaseThere is currently an exponentially growing number of receiving devices, based on impulse power supplies in every household
This paper presented a novel algorithm for compensating an AC component of a DC
That asymmetrical phase currents and resulting current flow in neutral wire cause the AC component to appear in the DC link current
Summary
There is currently an exponentially growing number of receiving devices, based on impulse power supplies in every household. Energy users would consume a large amount of energy in one phase, and produce energy in another phase (when using single-phase PV inverter) (Figure 1) These two combined factors can lead to an unbalance in phase currents, which in turn causes power transformers to operate in non-nominal conditions, leading to more losses and increasing risk of faults in the grid. Four-wire power converter causes large pulsation on DC link, which affects operation of the electrochemical energy storage [6,7]. In a balanced scenario, where the inverter generates symmetric currents, sum of time variant components cos(2ωt + φvk + φik ) of three phases equals zero, and there is no Currently, researchers focus onismethods utilizing pulsation present. Currents and at the same time maintain low level of a DC link current pulsation, acceptable for the lithium-ion energy storages
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