A low-voltage ride-through control strategy for three-phase grid-connected PV systems

Due to the fast growth of single-phase grid-connected photovoltaic (PV) systems, the existing grid codes are expected to be modified to guarantee the availability, quality, and reliability of the electrical system. Therefore, the future single-phase PV systems should become smarter and support low voltage ride-through (LVRT) capability, which are required for three-phase wind power systems. In this paper, the operation principle of a flyback inverter in a low-voltage ride-through operation is demonstrated in order to map future challenges. The steady state performance of the flyback inverter under voltage rise and drop conditions at boundary conduction mode (BCM) and discontinues conduction mode (DCM) is studied theoretically. The simulation results of the flyback inverter for various grid faults are presented to verify the theoretical analyses. The results indicate the fact that the flyback inverter at BCM condition can provide LVRT capability for photovoltaic microinverter applications in distributed generation (DG) systems, even though it does not need any auxiliary control branches and any limitations in components design.

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Low-Voltage Ride-Through Capability of a Single-Stage Single-Phase Photovoltaic System Connected to the Low-Voltage Grid

International Journal of Photoenergy ◽

10.1155/2013/257487 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9 ◽

Cited By ~ 52

Author(s):

Yongheng Yang ◽

Frede Blaabjerg

Keyword(s):

Distribution System ◽

Single Phase ◽

Control Method ◽

Low Voltage ◽

Photovoltaic System ◽

Pv System ◽

Pv Systems ◽

Low Voltage Ride Through ◽

Three Phase ◽

Future Challenges

The progressive growing of single-phase photovoltaic (PV) systems makes the Distribution System Operators (DSOs) update or revise the existing grid codes in order to guarantee the availability, quality, and reliability of the electrical system. It is expected that the future PV systems connected to the low-voltage grid will be more active with functionalities of low-voltage ride-through (LVRT) and the grid support capability, which is not the case today. In this paper, the operation principle is demonstrated for a single-phase grid-connected PV system in a low-voltage ride-through operation in order to map future challenges. The system is verified by simulations and experiments. Test results show that the proposed power control method is effective and the single-phase PV inverters connected to low-voltage networks are ready to provide grid support and ride-through voltage fault capability with a satisfactory performance based on the grid requirements for three-phase renewable energy systems.

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A Current Control Strategy for Three-Phase PV Power System with Low-Voltage Ride-Through

9th IET International Conference on Advances in Power System Control, Operation and Management (APSCOM 2012) ◽

10.1049/cp.2012.2140 ◽

2012 ◽

Cited By ~ 2

Author(s):

Yong-Sih Wu ◽

Yung-Ruei Chang ◽

Chia-His Chang ◽

Chih-Wen Liu ◽

Yaow-Ming Chen

Keyword(s):

Power System ◽

Control Strategy ◽

Low Voltage ◽

Current Control ◽

Low Voltage Ride Through ◽

Three Phase ◽

A Current

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Low-voltage ride-through for a three-phase four-leg photovoltaic system using SRFPI control strategy

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v9i3.pp1524-1530 ◽

2019 ◽

Vol 9 (3) ◽

pp. 1524

Author(s):

Haval Sardar Kamil ◽

Dalila Mat Said ◽

Mohd Wazir Mustafa ◽

Mohammad Reza Miveh ◽

Nasarudin Ahmad

Keyword(s):

Control Strategy ◽

Power Plants ◽

Low Voltage ◽

Photovoltaic System ◽

Electrical Grid ◽

Low Voltage Ride Through ◽

Power Stations ◽

Pv Inverter ◽

Synchronous Reference Frame ◽

Three Phase

With the innovative progresses in power electronics in recent years, photovoltaic (PV) systems emerged as one of the promising sources for electricity generation at the distribution network. Nonetheless, connection of PV power plants to the utility grid under abnormal conditions has become a significant issue and novel grid codes should be recommend. The low-voltage ride-through (LVRT) capability is one of the challenges faced by the integration of PV power stations into electrical grid under abnormal conditions. This work firstly provides a discussion on recent control schemes for PV power plants to enhance the LVRT capabilities. Next, a control scheme for a three-phase four-leg grid-connected PV inverter under unbalanced grid fault conditions using synchronous reference frame proportional integral (SRFPI) controller is proposed. Simulation studies are performed to investigate the influence of the control strategy on the PV inverter.

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