Improved LVRT Performance of PV Power Plant Using Recurrent Wavelet Fuzzy Neural Network Control for Weak Grid Conditions

Lin, Faa Jeng; Tan, Kean Ming; Luo, Wen Chou; Xiao, Guo

doi:10.1109/access.2020.2984803

Cited by 27 publications

(21 citation statements)

References 28 publications

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“…where equals to the maximum power capacity of PV system and is the voltage sag at the PCC reflected to low voltage side of the transformer. Since there is no LVRT requirement to clearly specify the voltage reduction ratio at the PCC can be evaluated as follows [38]:…”

Section: Control Strategy Of Microgridmentioning

confidence: 99%

“…Owing to the uncertainties in the microgrid system, the exact Jacobian calculation, which is l 12 /lD 3 f 89: , is difficult to determine accurately. To solve this problem and speed up the online updating of weights, the error adaptation law proposed in [38] is adopted in this study to replace the Jacobian term with:…”

Section: B Online Learning Algorithm For Rwpfnnmentioning

confidence: 99%

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Voltage Restoration Control for Microgrid With Recurrent Wavelet Petri Fuzzy Neural Network

et al. 2022

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This study presents a voltage restoration control (VRC) based on battery energy storage system (BESS), which can be used for both supporting power source and voltage compensation. Voltage restoration is an important task for the power control of microgrid during utility disturbances. One of the disturbances is caused by short circuit on power line of the microgrid, which may lead to voltage sag and even blackout of the microgrid system. To tackle this problem, the recurrent wavelet petri fuzzy neural network (RWPFNN) controller is proposed in this study for the VRC of BESS to provide fast control response to mitigate the transient impact. Moreover, to examine the compliance with the requirements of low voltage ride through (LVRT) of the photovoltaic (PV) plant and investigate the performance of the proposed VRC, the microgrid built in Cimei Island in Penghu Archipelago, Taiwan, is investigated. Furthermore, the PV system, the wind turbine generator (WTG) system and the BESS are connected to the same point of common coupling (PCC) with separated step-up transformers in the microgrid. In addition, the diesel generators provide the main power sources and form the isolated microgrid system. Through the hardware in the loop (HIL) mechanism, which is built using OPAL-RT real-time simulator, with two floating-point digital signal processors (DSPs), the effectiveness of proposed intelligent controllers can be verified and demonstrated.INDEX TERMS Battery energy storage system, low voltage ride through, microgrid, recurrent wavelet petri fuzzy neural network, voltage restoration control. Abbreviations table.

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Section: Control Strategy Of Microgridmentioning

confidence: 99%

Section: B Online Learning Algorithm For Rwpfnnmentioning

confidence: 99%

Voltage Restoration Control for Microgrid With Recurrent Wavelet Petri Fuzzy Neural Network

et al. 2022

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“…An improved LVRT technique designed for a weak grid is proposed in [154]. To control the active and reactive powers, recurrent wavelet fuzzy logic neural network (RWFNN) is employed, instead of conventional PI controllers.…”

Section: F Recurrent Wavelet Fuzzy Logic Neural Network Based Control (Rwflnnbc)mentioning

confidence: 99%

A Comprehensive Review of Control Strategies to Overcome Challenges During LVRT in PV Systems

Joshi¹,

Swami

Jately

et al. 2021

IEEE Access

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Due to the high penetration of grid-connected photovoltaic (GCPV) systems, the network operators are regularly updating the grid codes to ensure that the operation of GCPV systems will assist in maintaining grid stability. Among these, low-voltage-ride-through (LVRT) is an important attribute of PV inverters that allows them to remain connected with the grid during short-term disturbances in the grid voltage. Hence, PV inverters are equipped with control strategies that secure their smooth operation through this ride-through period as per the specified grid code. During the injection of reactive power under LVRT condition, various challenges have been observed, such as inverter overcurrent, unbalance phase voltages at the point of common coupling (PCC), overvoltage in healthy phases, oscillations in active, reactive power and dc-link voltage, distortion in injected currents and poor dynamic response of the system. Several strategies are found in the literature to overcome these challenges associated with LVRT. This paper provides a critical review on the recent challenges and the associated strategies under LVRT conditions in GCPV inverters. The drawbacks associated with the conventional current control strategies are investigated in MATLAB/Simulink environment and each category of the advanced LVRT control strategy is analyzed under different types of grid faults. Moreover, this work categorizes different state-of-the-art LVRT techniques on the basis of synchronization methods, current injection techniques and dc-link voltage control strategies. It is found that the state-of-the-art control strategies like OVSS/OCCIDGS provides improved voltage support and current limitation which results in smooth LVRT operation by injecting currents of enhanced power quality.

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“…At present, the low voltage ride-through strategies of PV grid-connected system have been extensively studied [20]- [22], while the HVRT technology is in its infancy. Some scholars have conducted exploratory research on the HVRT technology of grid-connected systems.…”

Section: Introductionmentioning

confidence: 99%

Partial Power Conversion and High Voltage Ride-Through Scheme for a PV-Battery Based Multiport Multi-Bus Power Router

et al. 2021

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With the development of renewable energy technology, distributed power supply mode with multi energy and multi-directional power flow including utility grid, renewable energy and energy storage unit has gradually become a research hotspot. An AC/DC hybrid multi-port power routing (MPPR) system which based on partial power conversion (PPC) of dual DC buses is proposed in this paper. The photovoltaic (PV) port, the battery port and two DC voltage buses form a power router. PV maximum power point tracking (MPPT) and high-voltage ride through (HVRT) of the grid-tied inverter are implemented by the same auxiliary port voltage modulation. The PPC based PV conversion features that only the power determined by voltage difference between PV panel and the series connected DC bus is dealt with, which significantly reduces the loss compared to the full power conversion (FPC) for PV. The detailed control schemes of all converters and energy transmit are given. The simulation and experimental results verify the effectiveness of the proposed scheme.INDEX TERMS Partial power conversion, multi-port power routing, high voltage ride-through, PV-battery, grid-connected system.

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Improved LVRT Performance of PV Power Plant Using Recurrent Wavelet Fuzzy Neural Network Control for Weak Grid Conditions

Cited by 27 publications

References 28 publications

Voltage Restoration Control for Microgrid With Recurrent Wavelet Petri Fuzzy Neural Network

Voltage Restoration Control for Microgrid With Recurrent Wavelet Petri Fuzzy Neural Network

A Comprehensive Review of Control Strategies to Overcome Challenges During LVRT in PV Systems

Partial Power Conversion and High Voltage Ride-Through Scheme for a PV-Battery Based Multiport Multi-Bus Power Router

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