Multi‐input transformer‐less four‐wire microinverter with distributed MPPT for PV systems

Gaafar, Mahmoud A.; Abdeen, Eltaib; Orabi, Mohamed

doi:10.1002/cta.2942

Cited by 9 publications

(13 citation statements)

References 40 publications

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“…The control strategy consists in simple closed-loop current control (PI controller). The paper [ 38 ] presents a switched capacitor buck-boost voltage source inverter (SC-BBVSI). The control strategy consists in a PI controller for dc-link voltage regulation and proportional-resonant (PR) controller for injected current regulation.…”

Section: Control Strategiesmentioning

confidence: 99%

Review of Control Techniques in Microinverters

Rojas

Muñoz

Rivera

et al. 2021

Sensors

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The use of renewable energies sources is taking great importance due to the high demand for electricity and the decrease in the use of fossil fuels worldwide. In this context, electricity generation through photovoltaic panels is gaining a lot of interest due to the reduction in installation costs and the rapid advance of the development of new technologies. To minimize or reduce the negative impact of partial shading or mismatches of photovoltaic panels, many researchers have proposed four configurations that depend on the power ranges and the application. The microinverter is a promising solution in photovoltaic systems, due to its high efficiency of Maximum Power Point Tracking and high flexibility. However, there are several challenges to improve microinverter’s reliability and conversion efficiency that depend on the proper control design and the power converter design. This paper presents a review of different control strategies in microinverters for different applications. The control strategies are described and compared based on stability, dynamic response, topologies, and control objectives. One of the most important results showed that there is little research regarding the stability and robustness analysis of the reviewed control strategies.

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Section: Control Strategiesmentioning

confidence: 99%

Review of Control Techniques in Microinverters

Rojas

Muñoz

Rivera

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…Among the existing renewable resource, the solar energy is designated as the representative due to its convenience, high economic merits, and infinity of energy storage. The development of photovoltaic (PV) power generation technology effectively relieves the pressure of traditional thermal power generation, and hence, it has received wide attention in the research community 1–3 …”

Section: Introductionmentioning

confidence: 99%

“…The development of photovoltaic (PV) power generation technology effectively relieves the pressure of traditional thermal power generation, and hence, it has received wide attention in the research community. [1][2][3] The PV power generation systems can be implemented by the centralized structure, group serial structure, or micro-module integrated structure. In the first two systems, the power generated by the PVs concentrates into the grid-connected inverter from a lot of nodes.…”

Section: Introductionmentioning

confidence: 99%

A novel compensation power‐decoupling strategy for single‐phase three‐level flying capacitor PV micro‐inverters

Luo

et al. 2022

Circuit Theory & Apps

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The traditional power‐decoupling controller for single‐phase photovoltaic (PV) micro‐inverters suffers from complex control structure, complicated parameter design and poor stability. In this paper, a novel compensation power‐decoupling strategy is proposed for a single‐phase three‐level flying capacitor PV micro‐inverter. The proposed strategy is aimed at tackling the problem of unbalanced charging and discharging of the flying capacitor, and hence makes the micro‐inverter highly stable and reliable. First, the topology and operating principle of the studied micro‐inverter are discussed, followed by the mathematical models established. Afterwards, the state‐space equations of the micro‐inverter are established for all the operating states, of which two transition variables are introduced to realize a linear presentation. On this basis, a double closed‐loop control method is designed to regulate the DC‐link voltage and current. Meanwhile, the flying capacitor voltage is controlled in a closed‐loop form to do the job of a power pulsating buffer (PPB). Following this, the proposed compensation power‐decoupling strategy is elaborated. Finally, some experimental results are presented to indicate the high performance of the studied micro‐inverter and verify the effectiveness of the proposed strategy.

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“…Grid‐connected inverters for PV systems may be one of the four structural topologies of string, multi‐string, central, and micro‐inverters 3,4 . In particular, micro‐inverter structures have some advantages such as receiving high power from the solar modules, eliminating the inappropriate effect of series modules like partial shading, extending simply, and no need for dc cables or precise dc standards 5,6 . Among different structures for micro‐inverters, dc link, without dc link, and pseudo‐dc link so‐called single stage, the latter is preferred due to lower losses 7,8 .…”

Section: Introductionmentioning

confidence: 99%

An active parallel power decoupling circuit with a dual loop control scheme for micro‐inverters

Rezaei

Akhbari

2021

Circuit Theory & Apps

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An important challenge in single‐stage single‐phase micro‐inverters is reducing required capacitance by various active power decoupling (APD) techniques in order to use film capacitors with a longer lifetime instead of electrolytic capacitors. In this paper, a photovoltaic (PV)‐side parallel APD circuit based on a bidirectional flyback converter is proposed. This topology is able to increase the average and ripple voltages for the capacitor due to having a transformer and thus can reduce the required capacitance. In the control scheme, dual control loops on the main and decoupling circuits manage the micro‐inverter operation. The primary control loop is based on the instantaneous active and reactive power theory and a proportional resonant (PR) controller that is responsible for delivering the PV panel energy to the grid. The secondary control loop regulates the pulsation power on the dc‐link capacitor through the PR controller. Simulation results demonstrated that the proposed APD circuit and the control method could properly damp the pulsation power in the normal and reference tracking operations. Furthermore, the good robustness of the micro‐inverter was confirmed in shutdown and start‐up. Finally, the experimental results with a 180‐W single‐phase micro‐inverter prototype are presented, which validates the advantages of the proposed configuration.

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Multi‐input transformer‐less four‐wire microinverter with distributed MPPT for PV systems

Cited by 9 publications

References 40 publications

Review of Control Techniques in Microinverters

Review of Control Techniques in Microinverters

A novel compensation power‐decoupling strategy for single‐phase three‐level flying capacitor PV micro‐inverters

An active parallel power decoupling circuit with a dual loop control scheme for micro‐inverters

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