Voltage support strategy for PV inverter to enhance dynamic voltage stability of islanded microgrid

Afrin, Nadia; Yang, Fang; Lu, Junwei

doi:10.1016/j.ijepes.2020.106059

Cited by 13 publications

(12 citation statements)

References 27 publications

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“…To mitigate the voltage instability of islanded MGs, prioritized reactive current injection from the inverter has been presented as a means for voltage support. Since islanded MGs contain considerable resistive line parameters [25,26], a sufficient active current component is also required in conjunction with the reactive current to enhance the dynamic voltage stability. Based on this requirement, effective coordination between the active and reactive current components for an IBG has been proposed in [27].…”

Section: Voltage Stability Of Microgridsmentioning

confidence: 99%

“…However, slow-acting supervisory control may lead to significant DC link voltage rise due to the excess of circulating power among the ICs during low load [50]. A voltage support strategy for grid feeding converter with new coordination between the active and reactive current injection considering the voltage level as well as the margin residue is proposed in [26] to improve the dynamic voltage stability of the islanded microgrid. Margin residue is introduced in this strategy to avoid any damage in the inverter due to the over current flow more than the maximum current.…”

Section: Interlinking Converters Dc-link Voltage and Islanded Micromentioning

confidence: 99%

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Voltage Stability of Power Systems with Renewable-Energy Inverter-Based Generators: A Review

et al. 2021

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The main purpose of developing microgrids (MGs) is to facilitate the integration of renewable energy sources (RESs) into the power grid. RESs are normally connected to the grid via power electronic inverters. As various types of RESs are increasingly being connected to the electrical power grid, power systems of the near future will have more inverter-based generators (IBGs) instead of synchronous machines. Since IBGs have significant differences in their characteristics compared to synchronous generators (SGs), particularly concerning their inertia and capability to provide reactive power, their impacts on the system dynamics are different compared to SGs. In particular, system stability analysis will require new approaches. As such, research is currently being conducted on the stability of power systems with the inclusion of IBGs. This review article is intended to be a preface to the Special Issue on Voltage Stability of Microgrids in Power Systems. It presents a comprehensive review of the literature on voltage stability of power systems with a relatively high percentage of IBGs in the generation mix of the system. As the research is developing rapidly in this field, it is understood that by the time that this article is published, and further in the future, there will be many more new developments in this area. Certainly, other articles in this special issue will highlight some other important aspects of the voltage stability of microgrids.

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Section: Voltage Stability Of Microgridsmentioning

confidence: 99%

Section: Interlinking Converters Dc-link Voltage and Islanded Micromentioning

confidence: 99%

Voltage Stability of Power Systems with Renewable-Energy Inverter-Based Generators: A Review

et al. 2021

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“…Apart from the above-mentioned VSS, several other improvements have been proposed to provide enhanced voltage support under unbalanced faults [100] - [105]. In [100], the injection of both active and reactive current is based on the severity of voltage sags so that the inverter rating is not exceeded. In [101], the voltage unbalance factor is minimized by employing droop control.…”

Section: ) Optimal Voltage Support Strategy (Ovss) [99]mentioning

confidence: 99%

“…Once the voltage sag occurs, the controller determines the inverter pseudo power, namely, the new nominal power (NNP) of the inverter which is determined by the voltage sag depth. The NNP is evaluated as in (100).…”

Section: ) Sinusoidal Current Injection Strategy (Scis) [115]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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“…Finally, the outer control takes advantage of combining inner levels of control to coordinate agents on the grid, such as tap changer and dump load, to support voltage stability. The authors in [25] utilized the margin on PV inverter to limit active power curtailment, which is eventually coordinated with reactive power to support voltage stability in islanded micro-grid. In [21], they conducted a comparison study of different voltage controls by conventional inverter.…”

Section: A Related Workmentioning

confidence: 99%

A Novel Cooperative Control Strategy to Mitigate PV Power Fluctuation and Increase its Penetration

Alsharif

2021

IEEE Access

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This paper proposes a novel optimization-based power sharing control strategy to moderate PV power intermittency and increase its penetration. Such a control strategy aims to minimize the total PV power sensitivity to the light change by re-distributing the demand power among available PV units such that the demanding power met with minimal variation. PV plant is coupled with the grid utility, and it should maintain a specific amount of power determined by the grid operator. However, due to the PV power sensitivity to the light, the delivered power at the coupling point fluctuates and leads to undesirable responses such as grid frequency excursion, stability problems, and unoptimized power generation. To address such issues, we formulate an optimization problem to reduce the total PV power sensitivity by selecting the optimal reference voltage for each PV panel. We define the power sensitivity as the rate of power change to light fluctuation to be the objective function of the proposed optimization problem, and the selected reference voltages for all PV panels are the decision variables. Compared to other conventional power-sharing techniques such as the same utilization level, droop control, and lookup table, MATLAB simulation results verify the contribution of the proposed algorithm's performance superiority in PV power sensitivity reduction, grid stability assurance, and power generation enhancement. Moreover, when there is insufficient PV power to meet the grid operator's demand, the proposed algorithm automatically sets the entire PV plant to work at its MPP without switching circuits.

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Voltage support strategy for PV inverter to enhance dynamic voltage stability of islanded microgrid

Cited by 13 publications

References 27 publications

Voltage Stability of Power Systems with Renewable-Energy Inverter-Based Generators: A Review

Voltage Stability of Power Systems with Renewable-Energy Inverter-Based Generators: A Review

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

A Novel Cooperative Control Strategy to Mitigate PV Power Fluctuation and Increase its Penetration

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