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Energies 2016, 9(10), 770; doi:10.3390/en9100770

Stator Current Harmonic Reduction in a Novel Half Quasi-Z-Source Wind Power Generation System

College of Electrical and Information Engineering, Hunan University, Changsha 410082, China
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Author to whom correspondence should be addressed.
Academic Editor: João P. S. Catalão
Received: 2 May 2016 / Revised: 11 August 2016 / Accepted: 20 September 2016 / Published: 23 September 2016
(This article belongs to the Special Issue Distributed Renewable Generation)
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Abstract

The generator stator current gets distorted with unacceptable levels of total harmonic distortion (THD) because impedance-source wind power generation systems use three-phase diode rectifiers. The stator current harmonics will cause increasing losses and torque ripple, which reduce the efficiency and stability of the system. This paper proposes a novel half quasi-Z-source inverter (H-qZSI) for grid-connected wind power generation systems, which can reduce the generator stator current harmonics a great deal. When H-qZSI operates in the shoot-through zero state, the derivative of the generator stator current is only determined by the instantaneous value of the generator stator voltage, so the nonlinear relationship between generator stator current and stator voltage is improved compared with the traditional impedance-source inverter. Theoretically, it is indicated that the stator current harmonics can be reduced effectively by means of the proposed H-qZSI. Finally, simulation and experimental results are given to verify the theoretical analysis. View Full-Text
Keywords: wind power generation; half quasi-Z-source inverter (H-qZSI); three-phase diode rectifier; shoot-through zero state; harmonic reduction wind power generation; half quasi-Z-source inverter (H-qZSI); three-phase diode rectifier; shoot-through zero state; harmonic reduction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Huang, S.; Zhang, Y.; Hu, S. Stator Current Harmonic Reduction in a Novel Half Quasi-Z-Source Wind Power Generation System. Energies 2016, 9, 770.

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