Neutral point inverter controller using h infinity techniques
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 c...
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| Format: | Thesis |
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2014
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| Online Access: | http://eprints.uthm.edu.my/5481/ http://eprints.uthm.edu.my/5481/1/ALI_OMAR_.M_ALSHARIF.pdf |
| Summary: | 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. |
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