Neutral point inverter controller using H infinity techniques

• Main Author: M. Alsharif, Ali Omar
• Format: Thesis
• Language: English; English; English
• Published: 2014
• Subjects: TK Electrical engineering. Electronics Nuclear engineering; TK7800-8360 Electronics
• Online Access: http://eprints.uthm.edu.my/1450/1/24p%20ALI%20OMAR%20.M%20ALSHARIF.pdf; http://eprints.uthm.edu.my/1450/2/ALI%20OMAR%20.M%20ALSHARIF%20COPYRIGHT%20DECLARATION.pdf; http://eprints.uthm.edu.my/1450/3/ALI%20OMAR%20.M%20ALSHARIF%20WATERMARK.pdf; http://eprints.uthm.edu.my/1450/
• Institution: Universiti Tun Hussein Onn Malaysia

For applications in renewable energy and distributed generation, there is often a need to have a neutral line to provide a current path. This can be achieved by using a neutral-point circuit that consists of a conventional neutral leg and a split dc link. In this project, a H infinity (H∞ ) current controller is proposed to force the current flowing through the split dc link to be nearly zero so that the neutral-point current is stable, and then, a current control loop is added to eliminate the imbalance of the current so that the neutral-point current is balanced with respect to the dc terminals. This leads to very small deviations of the neutral point from the mid-point of the DC source, in spite of the possibly large neutral current. Simulation of inverter circuit, neutral-point and H infinity (H∞ ) has been performed using MATLAB/SIMULINK software. The simulation results confirm the validity of the proposed method