Abstract
One of the disadvantages of the charging systems and voltage regulation systems in alternative energy systems is that when the direct current (DC)/alternative current (AC) or AC/DC conversion is made from the energy source, the energy flow at 2w frequency between the direct current side and the alternative current side causes ripples in the DC, inductors, and capacitors. The ripples that occur in 2w frequency increase the harmonic distortion and reduce the efficiency in the photovoltaic energy system. For addressing this problem, different control methods are evaluated in this paper for the elimination of ripples that occur at 2w frequency, both on the perspective of DC control side and AC control side with a thorough comparative analysis with existing results in the literature. In the present study, the model of Single-Phase Quasi-Z Source (QZS) inverter and closed-loop control methods of the inverter are examined and compared with pulse width modulation (PWM) methods. In addition, the control methods are used to eliminate the ripples at 2w frequency in the use of inverters, and the advantages and disadvantages of these methods are presented.
Highlights
With the environmental pollution stemming from fossil fuels and increased energy demand in recent years, the importance of distributed generation and renewable energy sources is increasing
This paper demonstrates the impacts of different control methods for the elimination of ripples at 2ω frequency carried out in the literature and draws out a better comparative analysis which in turn proposes a better control method for suppressing the negative effects caused by the ripples in the perspective of algorithm used at both alternative current (AC) and direct current (DC) side
In this current study, the Quasi-Z Source (QZS) inverter topology, which has the ability to decrease/increase voltage in one stage and convert voltage from direct current to alternating current, was examined. Since this topology is derived from ZSI topology, a new topology has been created with the positive attributes of Z-source inverter topology by eliminating or improving its negative aspects
Summary
With the environmental pollution stemming from fossil fuels and increased energy demand in recent years, the importance of distributed generation and renewable energy sources is increasing. Ripples occur in converter topologies at 2ω frequency causes a sudden increment in the harmonic level and decreases system efficiency. Output voltage is distorted, and current ripples occur at low frequency at the DC side [3]. It increases harmonic distortions and reduces the efficiency in photovoltaic energy system because it affects the monitoring of the maximum power points in such systems. S. Vadi et al.: Review of Control Methods on Suppression of 2ω Ripple for Single-Phase QZS Inverter.
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