Stability enhancement of transformered PV system using inrush mitigation techniques

Rane, Mahendra; Wagh, Sushama

doi:10.1109/naps.2017.8107388

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…In [ 42 , 43 , 44 , 45 ], the challenges of inrush currents during PV transformer energization are discussed. Ref.…”

Section: Introductionmentioning

confidence: 99%

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Field Programmable Gate Array-Based Smart Switch to Avoid Inrush Current in PV Installations

Martínez-Figueroa,

Córcoles,

Bogarra

2024

Sensors

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This paper introduces an FPGA-based implementation of a smart switch designed to avoid inrush currents occurring during the connection of single-phase transformers utilized in grid-connected photovoltaic (PV) systems. The magnitude of inrush currents is notably impacted by the residual flux within the transformer core and the precise moment of energization relative to the wave cycle. Alternative methods frequently hinge on intricate procedures to estimate residual flux. This challenge is adeptly circumvented by the innovative smart control system proposed herein, rendering it a cost-effective solution for grid-connected PV systems. The proposed solution for mitigating inrush current remains effective, even in the face of challenges with current and voltage sensors. This resilience arises from the system’s ability to learn and adapt by leveraging information acquired from the network.

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“…In [ 42 , 43 , 44 , 45 ], the challenges of inrush currents during PV transformer energization are discussed. Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Ref. [ 42 ] suggests peak instant switching and high-frequency operation to stabilize transformer-integrated PV systems. Ref.…”

Section: Introductionmentioning

confidence: 99%

Field Programmable Gate Array-Based Smart Switch to Avoid Inrush Current in PV Installations

Martínez-Figueroa,

Córcoles,

Bogarra

2024

Sensors

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“…This, in turn, potentially causes other loads to drop or even adjacent PV systems to operate with low voltage. If there are several PV systems on a single connected line, there could be a pattern of systemic voltage drops [9]. Grid codes are now being revised worldwide to limit transformer inrush currents.…”

Section: Introductionmentioning

confidence: 99%

Smart Switching in Single-Phase Grid-Connected Photovoltaic Power Systems for Inrush Current Elimination

Martínez-Figueroa,

Bogarra,

Córcoles

2023

Energies

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Grid-connected photovoltaic (PV) power systems are one of the most promising technologies to address growing energy demand and ecological challenges. This paper proposes smart switching to mitigate inrush currents during the connection of single-phase transformers used in PV systems. An effective inrush current mitigation contributes to the reliability of PV systems. The inrush current severity is influenced by the pseudorandom residual flux at the transformer core and the energization point-on-wave. The most common approach to avoid inrush currents is controlled connection, which requires prior knowledge of the residual flux. However, the residual flux can differ in each case, and its measurement or estimation can be impractical. The proposed smart switching is based on a comprehensive analysis of the residual flux and the de-energization trajectories, and only requires two pieces of data (ϕRM and ϕ0, flux values of the static and dynamic loops when the respective currents are null), calculated from two simple no-load tests. It has a clear advantage over common approaches: no need to estimate or measure the residual flux before each connection, avoiding the need for expensive equipment or complex setups. Smart switching can be easily implemented in practical settings, as it considers different circuit breakers with distinctive aperture features, making it cost-effective for PV systems.

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“…This error in the PLL operation introduces deviation in grid synchronisation and power transfer from individual DER into MG. Under this condition, PV based MG which has a low short-circuit capacity, and the low X/R ratio may lead to the unstable operation of the MG [16]. This makes essential to mitigate UbSVC in a standalone MG. To the best of the author's knowledge limitations observed in the literature are as given below,Effect of PCC voltage unbalances on power injection by DERThe impact of unbalance on synchronisation of DER which may occur due to the error produced by a PLL Based on the shortcomings in the literature following contributions are addressed in this paper.The impact of unbalance on synchronisation of DER and power injection from DER is analysed.Dynamic phasor (DP) based approach is used first time to design a compensator which provides active compensation during harmonic presence.Positive sequence component based compensator is proposed which considers zero component of dqitalic0 transformation provides more accuracy in the compensation.The performance of the proposed compensator is validated in real-time simulation using Opal-RT and dSPACE simulators, where dSPACE mimics the compensator and Opal-RT as a plant.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of harmonics and unbalanced source voltage condition in standalone microgrid: positive sequence component and dynamic phasor based compensator with real-time approach

Rane¹,

Wagh²

2019

Heliyon

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Penetration of Distributed Energy Resources (DER) is in high demand to supply power to the load where the grid is not available. Many of these sources are a single phase source used to form standalone Microgrid (MG). Single phase connectivity of these sources results in an unbalanced source voltage condition (UbSVC). Interfacing power electronic devices also inject the harmonics into Point of Common Coupling (PCC) voltage. The effect of this unbalance and harmonics on the operation of standalone MG is analysed in this paper in a twofold manner. One at a reduced power transfer from DER to load and the other is an error produced in Phase Locked Loop (PLL) operation. Positive Sequence Component (PSC) based and Dynamic Phasor (DP) based compensation techniques are proposed in this paper to mitigate the effect of UbSVC. Simulation validates that both the proposed methods are capable to provide balanced load voltage condition under UbSVC in terms of Voltage Unbalance Factor (VUbF). It also enhances the power transferred from DER to load during an UbSVC. The performance of the proposed compensator during UbSVC and harmonic presence is validated in real-time simulation using Opal-RT and dSPACE simulators.

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Stability enhancement of transformered PV system using inrush mitigation techniques

Cited by 3 publications

References 18 publications

Field Programmable Gate Array-Based Smart Switch to Avoid Inrush Current in PV Installations

Field Programmable Gate Array-Based Smart Switch to Avoid Inrush Current in PV Installations

Smart Switching in Single-Phase Grid-Connected Photovoltaic Power Systems for Inrush Current Elimination

Mitigation of harmonics and unbalanced source voltage condition in standalone microgrid: positive sequence component and dynamic phasor based compensator with real-time approach

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