Symmetric-component decoupled control of grid-connected inverters for voltage unbalance correction and harmonic compensation

Zhang, Ya; Roes, M. G. L.; Hendrix, M.A.M.; Duarte, J.L.

doi:10.1016/j.ijepes.2019.105490

Cited by 19 publications

(9 citation statements)

References 23 publications

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“…Considering the nextgeneration grid code requirements, Taul et al [334] proposed a general current reference strategy for asymmetrical fault control through a direct explicit method to calculate power references and controller gains taking into account the power limits of the converter. The strategy discussed in [335] decouples unbalance and harmonic compensation in the phase sequences and the frequency domain for a grid-connected inverter and is designed to be sequence asymmetric to achieve compensation. A new topology and LVRT strategy for CSI-based DGs is discussed in [336], which analyses quantitatively the relationship between steady-state DClink current and grid voltage and shows that LVRT cannot be realised in a conventional CSI.…”

Section: Unbalance Mitigation In the Grid-connected Modementioning

confidence: 99%

“…5 shows a typical control scheme for the grid‐connected mode involving a secondary communication‐based layer. This section summarises the available literature [14, 15, 16, 17, 20, 24, 26, 162, 219, 226–366] on unbalance mitigation in the grid‐connected scenario of both single and multiple inverters.…”

Section: Unbalance Mitigation In the Grid‐connected Modementioning

confidence: 99%

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Unbalance mitigation strategies in microgrids

Vijay

Doolla

Chandorkar

2020

IET Power Electronics

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Unbalance or asymmetry in the distribution network is a well-known power quality issue. In the modern active distribution system, with the increasing penetration of renewables, this phenomenon becomes more pronounced. In the context of microgrids (MGs), several works have been proposed for the management and mitigation of the unbalance, for both the sharing of unbalanced load and maintaining the voltage quality in the islanded mode and for the control of distributed generators in the grid-connected mode during unbalanced conditions. This study comprehensively reviews, summarises, and classifies the various strategies of the unbalance mitigation techniques for the islanded and grid-connected modes of operation for threephase MGs and presents the possible challenges and avenues for future investigations on the topic.

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Section: Unbalance Mitigation In the Grid-connected Modementioning

confidence: 99%

Section: Unbalance Mitigation In the Grid‐connected Modementioning

confidence: 99%

Unbalance mitigation strategies in microgrids

Vijay

Doolla

Chandorkar

2020

IET Power Electronics

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“…Considering (12) to provide oscillation-free of active power, p 2ω, 1 + p 2ω, 2 + p 2ω, 3 + ⋯ + p 2ω, m = 0 (see (13)) . Expression of (13) is rearranged as (see (14)) .…”

Section: Elimination Of the Collective Apos For Parallel Invertersmentioning

confidence: 99%

“…Hence, the MGs should be properly controlled to overcome voltage unbalances resulting in excessive heat in motor windings, reducing motor life and motor efficiency, deteriorating the operation of electrical equipment, threats to the DC bus capacitor, reducing inverter efficiency, increasing more harmonic injection currents and oscillations [8,9]. In the literature, various methods of symmetrical components have been investigated to simplify the analysis of unbalanced threephase power systems under both balanced and unbalanced conditions [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Multi‐objective control scheme for operation of parallel inverter‐based microgrids during asymmetrical grid faults

Çelík¹,

Meral²

2020

IET Renewable Power Generation

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The growing interest in connecting more distributed generation (DG) units to the utility grid, microgrids deal with the various challenges to satisfy a sufficient level of ancillary services such as active power oscillations (APOs), reactive power oscillations (RPOs), fault ride-through (FRT) capability, and overcurrent problem. Hence, for parallel operated grid-connected inverters (GCIs) based MG, this study presents a multi-objective control scheme that simultaneously ensures elimination of the collective APOs/RPOs at point of common coupling (PCC), overcurrent protection and reactive power injection. One of the significant parts of this study compared with similar existing studies is that provides reactive power support capability to fulfil the FRT requirements of the grid-connected multi-DG units and to remain grid-connected during asymmetrical grid faults. A current restraining control is also presented to ensure the safe operation of the MG system and to avoid overcurrent. The cancellation of the collective APOs and RPOs at the PCC for parallel operation of the GCIs has been achieved by using adjustable control coefficients and demonstrated with theoretical analyses in detail. Extensive case studies are presented and discussed to demonstrate the performance of the proposed ideas and to meet the shortcomings of the previous studies.

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“…In case of large nonlinear loads, harmonic content should be decreased using passive or active power filters which are an expensive solution, so ILCs can be effectively used to suppress harmonic currents imposed by nonlinear loads. The ILCs can contribute to voltage stability improvement [3,4], voltage unbalance compensation [5,6], flicker mitigation [7], harmonic compensation [8][9][10] and reactive power compensation [11] in MGs and distribution networks. As the number of nonlinear loads is growing rapidly in distribution systems, ILC harmonics compensation plays an interesting and important role.…”

Section: Introductionmentioning

confidence: 99%

Hybrid energy storage system control analogous to power quality enhancement operation of interlinking converters

Hajiaghasi

Salemnia

Hamzeh³

2021

IJECE

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Increasing nonlinear loads and power electronic converters lead to various power quality issues in microgrids (MGs). The interlinking converters (ILCs) can participate in these systems to harmonic control and power quality enhancement. However, ILC participation deteriorates the dc link voltage, system stability, and storage lifetime due to oscillatory current phenomena. To address these problems, a new control strategy for a hybrid energy storage system (HESS) is proposed to eliminate the adverse effects of the harmonic control operation of ILC. Specifically, battery and super-capacitor (SC) are used as HESSs that provide low and high power frequency load, respectively. The proposed strategy tries to compensate the current oscillation imposed by ILC with fuzzy control of HESS. In this method, a proportional-resonant (PR) controller integrated with harmonic compensator (HC) is employed to control the ILC for power quality enhancement and oscillatory current elimination. The main advantages of the proposed strategy are to reduce DGs power ﬂuctuations, precise DC bus voltage regulation for generation and load disturbances, improved grid power quality under nonlinear load and transition conditions. The performance of the proposed method for isolated and grid-connected modes is verified using simulation studies in the MATLAB software environment.

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Symmetric-component decoupled control of grid-connected inverters for voltage unbalance correction and harmonic compensation

Cited by 19 publications

References 23 publications

Unbalance mitigation strategies in microgrids

Unbalance mitigation strategies in microgrids

Multi‐objective control scheme for operation of parallel inverter‐based microgrids during asymmetrical grid faults

Hybrid energy storage system control analogous to power quality enhancement operation of interlinking converters

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