Control Strategy to Maximize the Power Capability of PV Three-Phase Inverters During Voltage Sags

Sosa, J.L.; Castilla, Miguel; Miret, Jaume; Matas, J.; Al‐Turki, Yusuf

doi:10.1109/tpel.2015.2451674

Cited by 147 publications

(126 citation statements)

References 31 publications

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“…Also, based on the recently revised grid codes, PV inverters are preferred to stay connected during grid voltage faults [5][6][7]. When fault happens, the converter has to detect the incident and react quickly to the disturbance to mitigate the adverse effects on the inverter and the equipment connected to the grid, and also the upstream system [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, dc link ripples during unbalanced faults are reduced with proper control of the converter. Among the major contributions of the paper is to investigate the effects of the PV arrays on the entire system and propose a control strategy for the PV side under unbalanced grid faults in contrast to [5,22,23,26,28]; in these works, the current reference generation and grid side control have been discussed. Therefore, the operation of a two-stage grid-connected PV converter under LVRT conditions can be rarely found in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

Afshari

Moradi

Rahimi

et al. 2017

IEEE Trans. Ind. Electron.

214

148

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Abstract-Power quality and voltage control are among the most important aspects of the grid-connected power converter operation under faults. Non-sinusoidal current may be injected during unbalanced voltage sag and active or/and reactive power may include double frequency content. This paper introduces a novel control strategy to mitigate the double grid frequency oscillations in the active power and dc-link voltage of the two-stage three-phase grid-connected Photovoltaic (PV) inverters during unbalanced faults. With the proposed control method, PV inverter injects sinusoidal currents under unbalanced grid faults. In addition, an efficient and easy-to-implement current limitation method is introduced, which can effectively limit the injected currents to the rated value during faults. In this case, the fault-ride-through operation is ensured and it will not trigger the overcurrent protection. A Non-MPPT operation mode is proposed for the dc-dc converter. The mode is enabled under severe faults, when the converter cannot handle the maximum PV power. Finally experimental validation is provided by implementing method in an experimental setup including a 2kW PV inverter.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

Afshari

Moradi

Rahimi

et al. 2017

IEEE Trans. Ind. Electron.

214

148

View full text Add to dashboard Cite

show abstract

“…Then the DC-link oscillations are avoided when injecting active and reactive powers during unbalanced network voltages [54] and, in this case, the injected currents are expressed as:…”

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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“…Particular attention should be given to weak networks with low short-circuit currents in which the injection of maximum current increases the risk of over-voltage generation tripping [19,20]. In these scenarios, appropriate control actions must be implemented to address this problem including active power curtailment, reactive current regulation, and so on [35,36].…”

Section: Power Quality Indexesmentioning

confidence: 99%

Performance Comparison of Grid-Faulty Control Schemes for Inverter-Based Industrial Microgrids

Camacho

Castilla

Canziani³

et al. 2017

Energies

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Several control schemes specifically designed to operate inverter-based industrial microgrids during voltage sags have been recently proposed. This paper first classifies these control schemes in three categories and then performs a comparative analysis of them. Representative control schemes of each category are selected, described and used to identify the main features and performance of the considered category. The comparison is based on the evaluation of several indexes, which measure the power quality of the installation and utility grid during voltage sags, including voltage regulation, reactive current injection and transient response. The paper includes selected simulation results from a 500 kVA industrial microgrid to validate the expected features of the considered control schemes. Finally, in view of the obtained results, the paper proposes an alternative solution to cope with voltage sags, which includes the use of a static compensator in parallel with the microgrid. The novelty of this proposal is the suitable selection of the control schemes for both the microgrid and the static compensator. The superior performance of the proposal is confirmed by the analysis of the quality indexes. Its practical limitations are also revealed, showing that the topic studied in this paper is still open for further research.

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Control Strategy to Maximize the Power Capability of PV Three-Phase Inverters During Voltage Sags

Cited by 147 publications

References 31 publications

Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults

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

Performance Comparison of Grid-Faulty Control Schemes for Inverter-Based Industrial Microgrids

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