Modeling And Triple-Loop Control Of Zvs Grid-Connected Dc/Ac Converters For Three-Phase Balanced Microinverter Application

Keywords

LCL filter; microinverter; three-phase four-wire inverter; total harmonic distortion (THD); two-stage; variable frequency bidirectional current mode control (VFBCMC); zerovoltage switching (ZVS)

Abstract

This paper presents modeling and triple-loop control for a high-efficiency three-phase balanced inverter for using in grid-connected two-stage microinverter applications. An average signal model based on a synchronous rotation frame for a three-phase four-wire inverter has been developed. The inner current loop consists of a variable frequency bidirectional current mode (VFBCM) controller which regulates output filter inductor current thereby achieving ZVS, improved system response, and reduced grid current THD. Active damping of the LCL output filter using filter inductor current feedback is discussed along with small signal modeling of the proposed control method. Since the dc-link capacitor plays a critical role in two-stage microinverter applications, a dc-link controller is implemented outside of the two current control loops to keep the bus voltage constant. Finally, based on a two-stage 400-W prototype, simulation and experimental results are presented to verify the validity of the theoretical analysis, the effectiveness and feasibility of the proposed VFBCM control strategy.

Publication Date

4-1-2015

Publication Title

IEEE Transactions on Power Electronics

Volume

30

Issue

4

Number of Pages

2010-2023

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/TPEL.2014.2329278

Socpus ID

84910067697 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84910067697

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