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.
Highlights
In the last decade, wind energy has become the fastest developing form of renewable energy and is widely utilized in power systems
The reason behind the stator current’s high total harmonic distortion of the sinusoidal waveform, which has negative influence on the efficiency and stability of the (THD) phenomenon is analyzed for the three-phase diode rectifier-based wind power generation system (WPGS) with traditional generation system
The derivative of three-phase stator current is analyzed in detail under the half quasi-Z-source inverter and traditional impedance-source inverter conditions
Summary
Wind energy has become the fastest developing form of renewable energy and is widely utilized in power systems. The DC-link boost control and AC side output control were presented to obtain the desired DC bus wind generator output and adjusts the q-ZSI shoot-through duty cycle employing the third harmonic voltage and reduce the impacts of disturbances on grids. Summary, the current output study of impedance-source power generation was of developed which In monitors wind generator and adjusts the q-ZSI wind shoot-through duty systems is confined to grid-connection control and MPPT. The current study of impedance-source wind power generation is confined to grid-connection control and MPPT. The reason behind the stator current’s high total harmonic distortion of the sinusoidal waveform, which has negative influence on the efficiency and stability of the (THD) phenomenon is analyzed for the three-phase diode rectifier-based WPGS with traditional generation system.
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