On the Reduction of Second Harmonic Current and Improvement of Dynamic Response for Two-Stage Single-Phase Inverter

Two-stage single-phase inverters have been widely used as they can achieve voltage matching and galvanic isolation between the input and output. Due to the pulsating output power of the downstream inverter, an ac current at twice the output frequency, which is called second harmonic current (SHC), a...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on power electronics 2015-02, Vol.30 (2), p.1028-1041
Main Authors: Zhu, Guoping, Ruan, Xinbo, Zhang, Li, Wang, Xuehua
Format: Article
Language:English
Subjects:
Capacitors
Conversion
Converters
Current mode control
Dynamic response
Electric currents
Electric potential
Energy efficiency
Harmonic analysis
Harmonics
Impedance
Inductors
Inverters
load current feed forward
Loads (forces)
notch filter
output impedance
Power harmonic filters
Propagation
second harmonic current (SHC)
two-stage single-phase inverter
Voltage
Voltage control
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Two-stage single-phase inverters have been widely used as they can achieve voltage matching and galvanic isolation between the input and output. Due to the pulsating output power of the downstream inverter, an ac current at twice the output frequency, which is called second harmonic current (SHC), arises in the input side of the downstream inverter. This SHC will penetrate to the front-end dc-dc converter, leading to reduced conversion efficiency. This paper first analyzes the propagation mechanism of the SHC and load transient response of two-stage single-phase inverters from the viewpoint of output impedance. Then, based on the current mode control and load current feed forward, two control methods to achieve low SHC in the front-end dc-dc converter and fast dynamic performance during load transient are proposed in this paper. Finally, a 2-kW two-stage single-phase inverter prototype has been constructed and tested, and the experimental results are provided to verify the effectiveness of the proposed control methods.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2014.2307092