A review on current injection techniques for low-voltage ride-through and grid fault conditions in grid-connected photovoltaic system

Hassan, Zaki El; Amir, Asim; Selvaraj, Jeyraj; Rahim, N.A.

doi:10.1016/j.solener.2020.06.085

Cited by 42 publications

(11 citation statements)

References 91 publications

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“…∆V The increment in the positive sequence and decrement in the negative sequence component of PCC voltage is achieved by carefully determining the reactive power references as in (39) and (40), respectively.…”

Section: ) Multiple Objective Voltage Support Strategy (Movss) [98]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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Section: ) Multiple Objective Voltage Support Strategy (Movss) [98]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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“…A statistical feature such as standard deviation is used to find the faulty branch while skewness is adopted to find the fault distance. The features are then used as input data for the ANN to classify the fault [129][130][131][132].…”

Section: Artificial Neural Networkmentioning

confidence: 99%

Transient Fault Detection and Location in Power Distribution Network: A Review of Current Practices and Challenges in Malaysia

et al. 2021

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An auto-restoration tool to minimize the impact of faults is one of the critical requirements in a power distribution system. A fault-monitoring system is needed for practical remote supervision to identify faults and reduce their impacts, and thus reduce economic losses. An effective fault-monitoring system is beneficial to improve the reliability of a protection system when faults evolve. Therefore, fault monitoring could play an important role in enhancing the safety standards of systems. Among the various fault occurrences, the transient fault is a prominent cause in Malaysia power systems but gains less attention due to its ability of self-clearance, although sometimes it unnecessarily triggers the operation of protection systems. However, the transient fault is an issue that must be addressed based on its effect that can lead to outages and short-circuits if prolonged. In this study, the authors summarize the guidelines and related standards of fault interaction associated with a monitoring system. The necessity of transient fault detection and location techniques and their limitations, the need for signal processing, as well as recommended practices, are also discussed in this paper. Some of the practices from local power utility are also shared, indicating the current approaches, key challenges, and the opportunities for improvement of fault-monitoring systems due to transient fault, which can be correlated with the reviews provided.

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“…Photovoltaic (PV) systems have been widely regarded as an economical and efficient solution for harvesting solar energy 1,2 . Grid‐connected inverters for PV systems may be one of the four structural topologies of string, multi‐string, central, and micro‐inverters 3,4 .…”

Section: Introductionmentioning

confidence: 99%

An active parallel power decoupling circuit with a dual loop control scheme for micro‐inverters

Rezaei

Akhbari

2021

Circuit Theory & Apps

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An important challenge in single‐stage single‐phase micro‐inverters is reducing required capacitance by various active power decoupling (APD) techniques in order to use film capacitors with a longer lifetime instead of electrolytic capacitors. In this paper, a photovoltaic (PV)‐side parallel APD circuit based on a bidirectional flyback converter is proposed. This topology is able to increase the average and ripple voltages for the capacitor due to having a transformer and thus can reduce the required capacitance. In the control scheme, dual control loops on the main and decoupling circuits manage the micro‐inverter operation. The primary control loop is based on the instantaneous active and reactive power theory and a proportional resonant (PR) controller that is responsible for delivering the PV panel energy to the grid. The secondary control loop regulates the pulsation power on the dc‐link capacitor through the PR controller. Simulation results demonstrated that the proposed APD circuit and the control method could properly damp the pulsation power in the normal and reference tracking operations. Furthermore, the good robustness of the micro‐inverter was confirmed in shutdown and start‐up. Finally, the experimental results with a 180‐W single‐phase micro‐inverter prototype are presented, which validates the advantages of the proposed configuration.

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A review on current injection techniques for low-voltage ride-through and grid fault conditions in grid-connected photovoltaic system

Cited by 42 publications

References 91 publications

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

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

Transient Fault Detection and Location in Power Distribution Network: A Review of Current Practices and Challenges in Malaysia

An active parallel power decoupling circuit with a dual loop control scheme for micro‐inverters

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