Comparative analysis of techniques for the limitation of compensation currents in multifunctional grid-tied inverters

Bonaldo, Jakson Paulo; Tofoli, Fernando Lessa; Monteiro, Raul Vitor Arantes; Paredes, Helmo Kelis Morales

doi:10.1016/j.ijepes.2020.106574

Cited by 11 publications

(5 citation statements)

References 36 publications

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“…Regardless of the method used to limit the current, all of them aim to limit the total current, without discriminating between the different current components of this current. With this regard, the limitation of the AHF capability in case of VSC overload has been previously explored in current controllers for active power filters: saturation approaches [37], [38], virtual impedance techniques [39] and optimization algorithms [40]. However, the limitation of the AHF capability in case of VSC overcurrent with direct harmonic voltage tracking remains unexplored.…”

Section: Introductionmentioning

confidence: 99%

Active Harmonic Filtering With Selective Overcurrent Limitation for Grid-Forming VSCs: Stability Analysis and Experimental Validation

Matas-Díaz,

Barragán-Villarejo,

Maza-Ortega

et al. 2024

IEEE Trans. on Ind. Applicat.

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The high penetration of renewable energy sources (RES) interfaced with power electronics together with new nonlinear loads pose new challenges in the grid operation. In fact, power systems with reduced inertia and high harmonic distortion will be common in a near future. Recently, the grid-forming operation of voltage source converters (VSCs) has emerged to address these challenges, mimicking the contribution of synchronous generators to the system inertia. In addition, these grid-connected VSCs can be used at the same time for reducing the harmonic distortion by applying active filtering techniques. However, these harmonic compensation algorithms can generate VSC overloading. This paper proposes a method for dynamically adjusting the individual virtual impedance of the filtered harmonics to prevent the power converter overcurrent. For this purpose, the value of each harmonic virtual impedance is modified according to a priority which can be set by the final user according to the established power quality standard. The paper includes a theoretical stability analysis of the controller and experimental results to validate the proposed algorithm.

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Section: Introductionmentioning

confidence: 99%

Active Harmonic Filtering With Selective Overcurrent Limitation for Grid-Forming VSCs: Stability Analysis and Experimental Validation

Matas-Díaz,

Barragán-Villarejo,

Maza-Ortega

et al. 2024

IEEE Trans. on Ind. Applicat.

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“…They are particularly beneficial in medium-voltage high-power motor drives only [1,3]. The multifunctional grid-tied inverters (MFGTIs) are developed to interface sustainable energy resources with the utility grid and to deliver supplementary services including compensation of harmonic and reactive current in microgrids [4,5]. However, the capacity of MFGTIs for power quality compensation is limited, and optimising their deployment to enhance grid power quality is a technical challenge [4,5].…”

Section: Introductionmentioning

confidence: 99%

A single-phase grid-tied extendable-level inverter for renewable energy applications

Aishwarya

2024

Eng. Res. Express

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The extraction of power from green energy sources (GES) has rapidly popularized owing to increasing energy demands, depletion of fossil fuels and growing concerns about climatic changes. Grid-tied multilevel inverters are critical components in the integration of green energy sources into the power grid and offer numerous benefits over standard two-level inverters. These benefits include superior power quality, diminished harmonic distortion, and the potential to utilize high power levels efficiently. A single-phase Grid-Tied Extendable-Level Inverter (GTELI) for green energy applications is demonstrated in this paper. The GTELI offers superior power quality and distortion-free output relative to existing grid-tied multilevel inverters and hence is an excellent choice for extracting power from sustainable energy sources. To ensure efficient utilization, the extracted power from GTELI is to be integrated into the supply grid. A new current control algorithm for the GTELI is also proposed in this paper. Using this current control technique a grid control technique is established to modulate the power flow to the grid. The proposed GTELI achieved sinusoidal grid voltage and injected current with minimised harmonic distortions of 1.6% and 2.7% respectively, which comply well with the tolerable range of the IEEE 519 standard.

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“…In [25], this work analyzed four control strategies for the limitation of currents in MFGTIs, considering key aspects such as performance and power quality indices at the point of common coupling (PCC). The literature [26] studied an algorithm that operated the inverter in maximum power generation and total harmonic distortion improvement modes to utilize the remaining capacity of the inverter for compensation of nonactive currents drawn by the dedicated loads.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System

Zhang,

Wang,

Zhang

et al. 2023

Electronics

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The harmonic and resonant characteristics of a multi-inverter grid-connected system can negatively affect power quality when weak grid conditions are present. In this paper, firstly, harmonic currents are modeled for the inverter, the correctness of low-frequency harmonics and high-frequency harmonics are verified in closed loop, and the characteristics of harmonic currents are analyzed when the parameters are varied. Secondly, the resonant characteristics of the inverter with feed-forward link are analyzed, and a multi-inverter grid-connected equivalent model based on the triple-decomposition conductance is developed and analyzed in conjunction with the resonant modal analysis method. Then, a harmonic resonance impedance reshaping method is proposed to suppress the background harmonics using improved weighted average current control (WACC), suppress the system resonance based on the point of common coupling (PCC) paralleling virtual conductance method, and improve the stability margin of the system combined with impedance reshaping resonance suppression method. Finally, simulations and comparison of results with different suppression methods verify the superiority and effectiveness of the proposed method.

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Comparative analysis of techniques for the limitation of compensation currents in multifunctional grid-tied inverters

Cited by 11 publications

References 36 publications

Active Harmonic Filtering With Selective Overcurrent Limitation for Grid-Forming VSCs: Stability Analysis and Experimental Validation

Active Harmonic Filtering With Selective Overcurrent Limitation for Grid-Forming VSCs: Stability Analysis and Experimental Validation

A single-phase grid-tied extendable-level inverter for renewable energy applications

Harmonic Resonance Analysis and Impedance Remodeling Method of Multi-Inverter Grid-Connected System

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