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A Semi Discontinuous PWM Method for Mitigating Oscillation in a Three-level Grid-tied PV Inverter

This paper presents a semi-discontinuous PWM (DPWM) method for a three-phase three-level PV inverter. Different from the conventional DPWM in which the zero sequence signal is stepped changed during the clamping period, the semi-DPWM is achieved by injecting a continuously changed signal with optimu...

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Main Authors:	Yang, Zhaoxia, Zeng, Jianwu, Ren, Qixing, Wu, Liangcai, Liao, Zhengjun
Format:	Conference Proceeding
Language:	English
Subjects:	Clamps Discontinuous PWM (DPWM) Energy conversion Harmonic analysis Inverters photovoltaic (PV) inverter Power quality semi DPWM Space vector pulse width modulation Switching loss three-level
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creator	Yang, Zhaoxia Zeng, Jianwu Ren, Qixing Wu, Liangcai Liao, Zhengjun
description	This paper presents a semi-discontinuous PWM (DPWM) method for a three-phase three-level PV inverter. Different from the conventional DPWM in which the zero sequence signal is stepped changed during the clamping period, the semi-DPWM is achieved by injecting a continuously changed signal with optimum slew rate in the modulation, which reduces the grid current oscillation as well as the switching loss. A detailed analysis of the grid current oscillation and the proposed semi-DPWM method is presented. The experiment is carried out on a 48 kW PV inverter and compared with the space vector PWM (SVPWM). The results show that the proposed semi DPWM method achieves the balance between the oscillation mitigation and the efficiency, the performance of grid current with semi-DPWM is maintained as good as that with SVPWM while the efficiency is increased from 97.03% and 97.22%.
doi_str_mv	10.1109/ECCE47101.2021.9595615
format	conference_proceeding
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recordid	cdi_ieee_primary_9595615
source	IEEE Xplore All Conference Series
subjects	Clamps Discontinuous PWM (DPWM) Energy conversion Harmonic analysis Inverters photovoltaic (PV) inverter Power quality semi DPWM Space vector pulse width modulation Switching loss three-level
title	A Semi Discontinuous PWM Method for Mitigating Oscillation in a Three-level Grid-tied PV Inverter
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