scholarly journals A Sliding-Mode Controlled Single-Phase Grid-Connected Quasi-Z-Source NPC Inverter With Double-Line Frequency Ripple Suppression

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 160004-160016 ◽  
Author(s):  
Sertac Bayhan ◽  
Hasan Komurcugil
Keyword(s):  
Single Phase ◽  
Sliding Mode ◽  
Double Line ◽  
Line Frequency

scholarly journals Classification of Three-Phase Grid-Tied Microinverters in Photovoltaic Applications

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2929
Author(s):  
Ahmed Shawky ◽  
Mahrous Ahmed ◽  
Mohamed Orabi ◽  
Abdelali El Aroudi
Keyword(s):  
Single Phase ◽  
Double Line ◽  
Line Frequency ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Pv Module ◽  
Three Phase ◽  
Power Point ◽  
Pv Grid

Microinverters are an essential part of the photovoltaic (PV) industry with significant exponential prevalence in new PV module architectures. However, electrolyte capacitors used to decouple double line frequency make the single-phase microinverters topologies the slightest unit in this promising industry. Three-phase microinverter topologies are the new trend in this industry because they do not have double-line frequency problems and they do not need the use of electrolyte capacitors. Moreover, these topologies can provide additional features such as four-wire operation. This paper presents a detailed discussion of the strong points of three-phase microinverters compared to single-phase counterparts. The developed topologies of three-phase microinverters are presented and evaluated based on a new classification based on the simplest topologies among dozens of existing inverters. Moreover, the paper considers the required standardized features of PV, grid, and the microinverter topology. These features have been classified as mandatory and essential. Examples of the considered features for classifications are Distributed Maximum Power Point Tracking (DMPPT), voltage boosting gain, and four-wire operation. The developed classification is used to identify the merits and demerits of the classified inverter topologies. Finally, a recommendation is given based on the classified features, chosen inverter topologies, and associated features.

scholarly journals Development of a DC-Side Direct Current Controlled Active Ripple Filter for Eliminating the Double-Line-Frequency Current Ripple in a Single-Phase DC/AC Conversion System

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4772
Author(s):  
Ying-Chieh Chen ◽  
Liang-Rui Chen ◽  
Ching-Ming Lai ◽  
Yuan-Chih Lin ◽  
Ting-Jung Kuo
Keyword(s):  
Energy Source ◽  
Steady State ◽  
Single Phase ◽  
Current Control ◽  
Control Loop ◽  
Double Line ◽  
Line Frequency ◽  
Conversion System ◽  
Current Ripple ◽  
Frequency Current

The objective of this paper is to propose an active ripple filter (ARF) using the patented DC-side direct current control for eliminating the double-line-frequency current ripple in a single-phase DC/AC conversion system. The proposed ARF and its control strategies can not only prolong the usage life of the DC energy source but also improve the DC/AC system performance. At first, the phenomena of double-line-frequency current ripple and the operation principle of the ARF are illustrated. Then, steady-state analysis, small-signal model, and control loop design of the ARF architecture are derived. The proposed control system includes: (1) a DC current control loop to provide the excellent ripple eliminating performance on the output of the DC energy source; (2) a voltage control loop for the high-side DC-bus voltage of the ARF to achieve good steady-state and transient-state responses; (3) a voltage feedforward loop for the low-side voltage of the ARF to cancel the voltage fluctuation caused by the instability of the DC energy source. Finally, the feasibility of the proposed concept can be verified by the system simulation, and the experimental results show that the nearly zero double-line-frequency current ripple on the DC-side in a single-phase DC/AC conversion system can be achieved.

scholarly journals Lyapunov-Function-Based Controller for Single-Phase NPC Quasi-Z-Source Inverter with 2ω Frequency Ripple Suppression

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 140
Author(s):  
Sertac Bayhan ◽  
Hasan Komurcugil
Keyword(s):  
Lyapunov Function ◽  
High Performance ◽  
Single Phase ◽  
Neutral Point ◽  
Control Technique ◽  
Output Current ◽  
Double Line ◽  
Line Frequency ◽  
Resonant Controller ◽  
Boost Control

This paper proposes a high-performance control technique based on Lyapunov’s stability theory for a single-phase grid-connected neutral-point-clamped quasi-impedance source inverter with LCL filter. The Lyapunov function based control is employed to regulate the inverter output current, whereas the proportional resonant controller is used to produce the reference of the inverter output current that is needed in the Lyapunov function based control. Use of proportional resonant controller ensures the zero steady-state error in the grid current. An important feature of the proposed Lyapunov function based control is the achievement of resonance damping without using a dedicated damping method. Furthermore, the modified simple boost control technique is proposed to eliminate the double-line frequency ripples in the quasi-impedance source inductor currents and minimize the double-line frequency ripples in the quasi-impedance source capacitor voltages. The proposed control technique considerably reduces the inverter size, weight, and cost as well as increases overall system efficiency since the required inductances and capacitances sizes are lower. Experimental results obtained from a 2.5 kW neutral-point-clamped quasi-impedance source inverter prototype are presented to validate the performance of the Lyapunov function based control technique.

scholarly journals Power Decoupling of a Single Phase DC-AC Dual Active Bridge Converter Based on an Integrated Bidirectional Buck/Boost Stage

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2746 ◽  
Author(s):  
Jiatu Hong ◽  
Mahinda Vilathgamuwa ◽  
Jian Yin ◽  
Yitao Liu ◽  
Jianchun Peng ◽  
...  
Keyword(s):  
Single Phase ◽  
Electrolytic Capacitor ◽  
Voltage Source ◽  
Double Line ◽  
Decoupling Method ◽  
Line Frequency ◽  
Dual Active Bridge ◽  
Power Decoupling ◽  
Dc Current ◽  
Frequency Power

In single phase DC-AC systems, double-line-frequency power ripple appears at the DC side inherently. Normally a large electrolytic capacitor can be used to reduce the power ripple at the DC side. But there are several problems with this method as it decreases the power density and reliability of the converter. In addition, a double-line-frequency current ripple appears in case a voltage source serves at the DC side, which is undesired in specific applications. This paper proposes a single phase DC-AC DAB (dual active bridge) converter with an integrated buck/boost stage for power decoupling purpose under low power condition. The proposed active power decoupling method is able to completely eliminate the double-line-frequency power ripple at the DC side. Therefore, a constant DC current can be obtained for requirements in specific DC-AC applications.

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