1. Introduction The single-phase grid connected inverter can convert DC power into single-phase AC power, which plays an important role in household new energy power generation, UPS, active filter and so on (Kjaer et al., 2005, Kjaer et al., 2003, Mihalache, 2002).
The DC component causes corrosion of the grounding device. There are two mainstream methods that can be used to suppress the DC component of the non-isolated grid-connected inverter. One is passive suppression. For example, the isolation transformer and the isolation capacitor are used to isolate the DC component.
The output voltage of the single-phase inverter is (8) u ab = u dc M cos (ω t) = U dc + u pp sin (2 ω t) M cos (ω t) = U dc M cos (ω t) + 1 2 u pp M sin (ω t) + sin (3 ω t) Expression (8) shows that the second ripple voltage of DC link will make the AC output voltage contain abundant third harmonic voltage. 3.
1. Introduction In the two-stage single-phase inverter, the second harmonic current with twice output voltage frequency exists in the former DC converter because the instantaneous output power of the latter inverter contains the pulsating power of twice the output voltage frequency.
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Aiming at the problem that the DC component in the output voltage of the T-type three-level inverter in the island mode is obvious, due to its hardware differences, a nonlinear …
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Cost-Effective DC Current Suppression for Single-Phase Grid-Connected PV Inverter Bin Guo, Mei Su, Yao Sun, Member, IEEE, Hui Wang, Xing Li, Yuefeng Liao, Student …
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(2) Parallel a bidirectional inverter on the intermediate bus capacitor, and provide the pulsating power required by the single-phase inverter through the bidirectional inverter, …
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1. Introduction In the two-stage single-phase inverter, the second harmonic current with twice output voltage frequency exists in the former DC converter because the …
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In modern power electronics, the single phase inverter plays a critical role in applications such as uninterruptible power supplies (UPS), renewable energy integration, and …
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This paper presents the control strategy for parallel operation of an inverter to eliminate DC & AC circulating current. This paper also analyses the cross-current between …
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Similarly, to detect the dc component at the inverter output, the authors in [6] and [19] utilized a voltage sensor combined with a differential amplifier and a low pass filter for …
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Reference [8] proposed a single-phase half-bridge inverter topology with DC component suppression, but it has a small capacity and is only suitable for low-power …
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ABSTRACT Due to the components at twice the fundamental frequency of output voltage in the instantaneous output power of a two-stage single-phase inverter (TSI), the …
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Due to the disparity of power modules, asymmetry of driving pulses and measurement errors of sensors, dc currents may be injected to grid-connected photovoltaic …
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A DC component suppression branch consisting of an integral controller is added to the conventional fundamental current control branch in the outer current-loop,which increases the …
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The design of a current control system for a single-phase grid-tied inverter equipped with a LCL grid-side filter, which is suitable for inverter DC current component suppression, …
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Abstract The zero drift occurring to the sampling conditioning circuit of the non-isolated grid-connected inverter will make the output develop a DC component, thus resulting …
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In the present study, a closed-loop control strategy based on moving average filter to detect DC component and quasi-PIR control is proposed for the output DC component of …
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Since the objective of this paper is to realize DC component suppression using virtual capacitors in a 3-phase L C L type grid connected inverter, the correctness and validity …
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The DC bus voltage in single-phase converters inherently exhibits a second harmonic ripple. To accurately track the current reference value, notch filters are typically …
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Reference [8] proposed a single-phase half-bridge inverter topology with DC component suppression, but it has a small capacity and …
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The single-phase grid connected inverter can convert DC power into single-phase AC power, which plays an important role in household new energy power generation, UPS, …
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The structure of the single-phase AC-DC-AC system involved in this study is shown in Fig. 1. This system eliminates the secondary filtering circuit found in traditional single …
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