Reconfigurable Control Scheme for a PV Microinverter Working in Both Grid-Connected and Island Modes

Rodríguez, César Leonardo Trujillo; Fuente, David; Garcerá, G.; Figueres, E.; Moreno, Javier Antonio Guacaneme

doi:10.1109/tie.2011.2177615

Cited by 93 publications

(21 citation statements)

References 40 publications

(27 reference statements)

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“…The inverter is however droop-controlled using almost the same control blocks as in Fig. 3 for the islanded mode, except with the improved droop expressions in (18) and (19) used instead. In addition, a harmonic detection block based on instantaneous power theory [24] has been used for extracting harmonic voltage v h from the inverter terminal voltage v ac .…”

Section: Grid-connected Modementioning

confidence: 99%

“…It uses four controllers in total, and is hence equally complex. In [19], the transfer is accompanied by a reconfiguration of controllers, which supposedly, is a non-optimized solution when compared with schemes that use a single common control structure throughout the transfer. Such common control schemes are however not widely discussed at present.…”

Section: Introductionmentioning

confidence: 99%

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Droop Control With Improved Disturbance Adaption for a PV System With Two Power Conversion Stages

Liu

Loh

Wang

et al. 2016

IEEE Trans. Ind. Electron.

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Droop control has commonly been used with distributed generators for relating their terminal parameters with power generation. The generators have also been assumed to have enough capacities for supplying the required power. This is however not always true, especially with renewable sources with no or insufficient storage for cushioning climatic changes. In addition, most droop-controlled literatures have assumed a single dc-ac inverter with its input dc source fixed. Front-end dc-dc converter added to a two-stage photovoltaic (PV) system has therefore usually been ignored. To address these unresolved issues, an improved droop scheme for a two-stage PV system has been developed in the paper. The developed scheme uses the same control structure in both grid-connected and islanded modes, which together with properly tuned synchronizers, allows mode transfer to be seamlessly triggered. Moreover, the proposed scheme adapts well with internal PV and external grid fluctuations, and is hence more precise with its tracking, as compared with the traditional droop scheme. Simulation and experimental results have verified these expectations, and hence the effectiveness of the proposed scheme.

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Section: Grid-connected Modementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Droop Control With Improved Disturbance Adaption for a PV System With Two Power Conversion Stages

Liu

Loh

Wang

et al. 2016

IEEE Trans. Ind. Electron.

View full text Add to dashboard Cite

show abstract

“…Additionally, in [16] and [17], the transfer between grid-connected and islanded modes has been activated by a reconfiguration of controllers in a single PV source. This is subsequently found to be non-optimized when compared with schemes that use the same control structure in both modes.…”

mentioning

confidence: 99%

An Enhanced Dual Droop Control Scheme for Resilient Active Power Sharing Among Paralleled Two-Stage Converters

Liu

Yang

Wang

et al. 2017

IEEE Trans. Power Electron.

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Abstract-Traditional droop-controlled system has assumed that generators can always generate the powers demanded from them. This is true with conventional sources, where fuel supplies are usually planned in advance. For renewable sources, it may also be possible if energy storage is available. Energy storage, usually as batteries, may however be expensive, depending on its planned capacity. Renewable sources are therefore sometimes installed as non-dispatch-able sources without storage. This may not be viable for remote grids, where renewable sources may be the only or major type of sources. In those cases, traditional droop scheme may not work well when its demanded power cannot be met by some renewable sources due to intermittency. When that happens, the system may become unstable with some sources progressively brought out of generation. To avoid such occurrence, an enhanced dual droop scheme is proposed for general two-stage converters with front rectifiers or dc-dc converters for conditioning powers from renewable sources and rear inverters for channeling powers to remote grids. Unlike the traditional droop scheme, the proposed dual droop scheme uses both dc-link voltage and generated powers for determining the required control actions, which have subsequently been proven stable by small-signal analysis. Experimental results have also verified the effectiveness of the dual droop scheme.

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“…In a non-dispatchable DGS, the active power reference P* is usually calculated by a local controller using local variables. Its aim is to extract the maximum allowable energy from the source [47,55]. Active power curtailment can also be required to protect the inverter from over currents when a voltage sag occurs [10,11].…”

Section: Network-forming Controllermentioning

confidence: 99%

A Flexible Experimental Laboratory for Distributed Generation Networks Based on Power Inverters

et al. 2017

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Abstract:In the recently deregulated electricity market, distributed generation based on renewable sources is becoming more and more relevant. In this area, two main distributed scenarios are focusing the attention of recent research: grid-connected mode, where the generation sources are connected to a grid mainly supplied by big power plants, and islanded mode, where the distributed sources, energy storage devices, and loads compose an autonomous entity that in its general form can be named a microgrid. To conduct a successful research in these two scenarios, it is essential to have a flexible experimental setup. This work deals with the description of a real laboratory setup composed of four nodes that can emulate both scenarios of a distributed generation network. A comprehensive description of the hardware and software setup will be done, focusing especially in the dual-core DSP used for control purposes, which is next to the industry standards and able to emulate real complexities. A complete experimental section will show the main features of the system.

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Reconfigurable Control Scheme for a PV Microinverter Working in Both Grid-Connected and Island Modes

Cited by 93 publications

References 40 publications

Droop Control With Improved Disturbance Adaption for a PV System With Two Power Conversion Stages

Droop Control With Improved Disturbance Adaption for a PV System With Two Power Conversion Stages

An Enhanced Dual Droop Control Scheme for Resilient Active Power Sharing Among Paralleled Two-Stage Converters

A Flexible Experimental Laboratory for Distributed Generation Networks Based on Power Inverters

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