Implemental Control Strategy for Grid Stabilization of Grid-Connected PV System Based on German Grid Code in Symmetrical Low-to-Medium Voltage Network

Bae, Youngsang; Vu, Trung-Kien; Kim, Rae-Young

doi:10.1109/tec.2013.2263885

Cited by 227 publications

(116 citation statements)

References 10 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]. Indeed, the revised grid codes require PV systems to inject a certain amount of reactive power in case of the low voltage faults [1,4,6,7,11,12].…”

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.

194

145

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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%

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.

194

145

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show abstract

“…Considering the demand of the dynamic reactive power of IIDG [25] and the inverter capacity constraint during LVRT, the active and reactive power reference values of a PV power supply can be calculated as…”

Section: Short-circuit Calculation Principlementioning

confidence: 99%

Ground-Fault Characteristic Analysis of Grid-Connected Photovoltaic Stations with Neutral Grounding Resistance

et al. 2017

Energies

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Abstract:A centralized grid-connected photovoltaic (PV) station is a widely adopted method of neutral grounding using resistance, which can potentially make pre-existing protection systems invalid and threaten the safety of power grids. Therefore, studying the fault characteristics of grid-connected PV systems and their impact on power-grid protection is of great importance. Based on an analysis of the grid structure of a grid-connected PV system and of the low-voltage ride-through control characteristics of a photovoltaic power supply, this paper proposes a short-circuit calculation model and a fault-calculation method for this kind of system. With respect to the change of system parameters, particularly the resistance connected to the neutral point, and the possible impact on protective actions, this paper achieves the general rule of short-circuit current characteristics through a simulation, which provides a reference for devising protection configurations.

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“…Due to the fast development, even tougher requirements have been released for PV systems [18]- [20]. A general categorization of the demands to PV systems is shown in Fig.…”

Section: Demands To Pv Power Conversion Systemsmentioning

confidence: 99%

Power electronics - the key technology for renewable energy system integration

Blaabjerg

Yang

et al. 2015

2015 International Conference on Renewable Energy Research and Applications (ICRERA)

110

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Implemental Control Strategy for Grid Stabilization of Grid-Connected PV System Based on German Grid Code in Symmetrical Low-to-Medium Voltage Network

Cited by 227 publications

References 10 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

Ground-Fault Characteristic Analysis of Grid-Connected Photovoltaic Stations with Neutral Grounding Resistance

Power electronics - the key technology for renewable energy system integration

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