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Research Papers

Modeling and Control of Grid-Connected Photovoltaic Power Plant With Fault Ride-Through Capability

[+] Author and Article Information
Ali Q. Al-Shetwi

Faculty of Electrical and Electronic Engineering,
University Malaysia Pahang (UMP),
Pekan 26600, Pahang, Malaysia
e-mail: alialshetwi@yahoo.com

Muhamad Zahim Sujod

Faculty of Electrical and Electronic Engineering,
University Malaysia Pahang (UMP),
Pekan 26600, Pahang, Malaysia
e-mail: zahim@ump.edu.my

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received May 28, 2017; final manuscript received November 14, 2017; published online December 22, 2017. Assoc. Editor: Geoffrey T. Klise.

J. Sol. Energy Eng 140(2), 021001 (Dec 22, 2017) (8 pages) Paper No: SOL-17-1197; doi: 10.1115/1.4038591 History: Received May 28, 2017; Revised November 14, 2017

According to modern grid codes (GCs), high penetration of photovoltaic power plants (PVPPs) to the utility grid requires a reliable PV generation system by achieving fault ride-through (FRT) requirements. In order to meet these requirements, there are two major issues that should be addressed to keep the inverter connected during grid fault. The two issues are the ac over-current and dc-link over-voltage that may cause disconnection or damage to the grid inverter. In this paper, the control of single-stage PVPP inverters is developed to address these issues and enhance FRT capability. The proposed control scheme introduces the dc brake chopper circuit and current limiter to protect the inverter and ride through the fault smoothly with no perceptible overcompensation. A 1.5 MW PVPP connected into the Malaysian grid and modeled in simulink is utilized to explain the proposed control scheme. The simulation results presented demonstrate the effectiveness of the overall proposed control strategy to ride through different types of faults and to help to ensure the safety of the system equipment.

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Figures

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Fig. 1

General curve limits for FRT requirements

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Fig. 2

The Malaysian FRT requirements

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Fig. 3

The PV power station connected to the Malaysian grid

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Fig. 4

Maximum voltage, current, and power of the PVPP array at STC

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Fig. 5

Voltage of the dc-link in the system

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Fig. 6

Control scheme of the grid inverter

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Fig. 7

Schematic diagram of the SRF-PLL

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Fig. 8

Schematic diagram of the proposed FRT control strategy

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Fig. 9

Flow diagram for the proposed FRT control

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Fig. 10

The control of current limiter

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Fig. 11

Simulation response of the PVPP with 60% voltage sag (2 LG) and 40% voltage drop without current limiter: (a) positive sequence of grid voltage in p.u., (b) grid voltage, and (c) grid current

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Fig. 12

Simulation response of the PVPP with 60% voltage sag (2 LG)-40% voltage drop with adding current limiter: (a) positive sequence of grid voltage in p.u., (b) grid voltage, and (c) grid current

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Fig. 13

Chopper brake circuit for FRT protection devices

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Fig. 14

The change in (IV) curve operating point under grid fault

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Fig. 15

Simulation response of the PVPP with 85% voltage sag (3-ph)-15%voltage drop without dc-chopper FRT: (a) positive sequence of grid voltage in p.u., (b) PV array voltage, (c) PV array current, (d) PV system output power, and (e) dc-link voltage

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Fig. 16

Simulation response of the PVPP with 85% voltage sag (3-ph)-15% voltage drop with dc-chopper FRT: (a) grid voltage in p.u., (b) PV array voltage, (c) PV array current, (d) PV system output power, and (e) dc-link voltage

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