Three-Phase PWM Inverter for Isolated Grid-Connected Renewable Energy Applications

Ahmed Ismail M. Ali, Takaharu Takeshita and Mahmoud A. Sayed
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Ahmed Ismail M. Ali: Electrical and Mechanical Engineering Department, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Takaharu Takeshita: Electrical and Mechanical Engineering Department, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Mahmoud A. Sayed: Electrical Engineering Department, South Valley University, Qena 83523, Egypt

Energies, 2021, vol. 14, issue 12, 1-16

Abstract: This paper proposes a three-phase isolated flyback inverter (IFBI) for single-stage grid-tied solar PV applications, considering a simple sinusoidal pulse-width modulation (SPWM) scheme. The proposed single-stage inverter employs a reduced passive elements count by considering three input-parallel output-differential (IPOD) flyback converter modules. Additionally, a single small size LC-input low-pass filter is utilized at the input paralleling point for ripple-free input current operation, which is essential in grid-connected renewable energy applications. In addition, a mathematical model of the IFBI is presented to confirm the existence of its low-order harmonic components. A simple PI controller-based control scheme, considering only two loops and five sensors, is used to control the proposed grid-tied IFBI. Continuous modulation scheme (CMS) combined with SPWM is used to diminish the low-frequency harmonic components. Moreover, a simple selective harmonic elimination (SHE) loop is used for second-order harmonic components (SOHC) elimination from grid-injected currents. The SHE has decreased the SOHC from 43% to 0.96%, which improves the grid current THD from 39% to 3.65%, to follow the IEEE harmonic standard limits. Additionally, the harmonic elimination technique decreases the circulating power between the inverter paralleled modules, which enhances the grid currents power factor. The proposed inverter is verified through a grid-connected 200 V, 1.6 kW, 60 Hz experimental prototype, and the switching frequency is 50 kHz. TMS-based DSP controller is used to control the grid-injected power to follow the reference power set-point.

Keywords: DC-AC grid-connected converter; isolated flyback inverter (IFBI); high-frequency transformer (HFT); harmonic component (HC); selective harmonic elimination (SHE) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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