Instantaneous Current Distributing Control Collaborated with Voltage to Neutral Equalization for Grid-Tied Single-Phase Three-Wire Inverters | IEEE Conference Publication | IEEE Xplore

Instantaneous Current Distributing Control Collaborated with Voltage to Neutral Equalization for Grid-Tied Single-Phase Three-Wire Inverters

Publisher: IEEE

Abstract:

To provide multiple standard voltages for various load specifications, a single-phase three-wire inverter in which a neutral line tapped to the midpoint of the dc-link wa...View more

Abstract:

To provide multiple standard voltages for various load specifications, a single-phase three-wire inverter in which a neutral line tapped to the midpoint of the dc-link was adopted. Since the loads across the line to neutral are always distinct, different degrees of drop voltage across the inverter coupled filter would result unbalanced line-to-neutral voltages. This paper presents a control strategy for the inverter that is able to distribute the current for a feeder tied to the point of common coupling (PCC) while preserving a favorable voltage to neutral equalization. To equalize the line-to-neutral voltages, a simple algebraic algorithm using only the grid voltage and line current was proposed. As a result, complicated computations involved in the current control loop can be avoided. In addition, the implementation cost can be reduced to a great extent since there is no need for sensing the line-to-neutral voltage. A mathematical formulation for the proposed control scheme is first described. Then the dynamic responses subject to various loading conditions are performed on a 2kVA modified full-bridge inverter with dc bypass (FB-DCBP) platform. It is concluded from the experimental results that line-to-neutral voltage can be effectively equalized under various loading conditions with the proposed approach.
Date of Conference: 13-15 June 2018
Date Added to IEEE Xplore: 13 August 2018
ISBN Information:
Electronic ISSN: 2163-5145
Publisher: IEEE
Conference Location: Cairns, QLD, Australia

References

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