Current Control of a Three-Phase, Grid-Connected Inverter in the Presence of Unknown Grid Parameters Without a Phase-Locked Loop

Alqatamin, Moath; Latham, Joseph; Smith, Zachary T.; Grainger, Brandon M.; McIntyre, Michael L.

doi:10.1109/jestpe.2020.3001153

Cited by 19 publications

(8 citation statements)

References 37 publications

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“…Moreover, ω ∈ L ∞ and from Assumption 3, ω ∈ L ∞ and therefore ω ∈ L ∞ . Since d i and d v are bounded by assumption, then from(24) and(30) one can conclude that di , dv ∈ L ∞ . Since Ĩγ , Ĩδ , θ, ω ∈ L ∞ , from definition of .…”

mentioning

confidence: 90%

“…For instance, the authors in [23] proposed a direct power controller for a single-phase grid-connected inverter without a PLL scheme. Moreover, we proposed in our work in [24] a method for a PLL-less current control scheme for three-phase, grid-connected inverters. Although these methods do not need a PLL scheme, they do not consider a grid-connected PV system or the additional dynamics this would entail.…”

Section: Introductionmentioning

confidence: 99%

“…Although these methods do not need a PLL scheme, they do not consider a grid-connected PV system or the additional dynamics this would entail. Previous studies [19][20][21][22][23][24] have considered a fixed dc voltage as an input. Hence, the dynamic of the PV panels, dc voltage regulator, and maximum power point tracking algorithm are not included in their control schemes.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Self-Synchronizing Current Control for Grid-Connected Photovoltaic Inverters

Alqatamin

McIntyre

2022

Energies

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Three-phase inverters for photovoltaic grid-connected applications typically require some form of grid voltage phase-angle detection in order to properly synchronize to the grid and control real and reactive power generation. Typically, a phase-locked loop scheme is used to determine this real-time phase angle information. However, in the present work, a novel method is proposed whereby the phase angle of the grid can be accurately identified solely via the grid current feedback. This phase-angle observer is incorporated into a current controller which can manage the real and reactive power of the grid-connected PV inverter system. Moreover, the maximum power point of the photovoltaic arrays is achieved without using a DC–DC converter. The proposed method achieves the grid current and DC-link voltage control objectives without the knowledge of the grid information and without the need for a cascaded control scheme. The design of this combined observer/controller scheme is motivated and validated via a Lyapunov stability analysis. The experimental setup is prototyped utilizing a real-time Typhoon HIL 603 and National Instrument cRIO embedded controller in order to validate the proposed observer/controller scheme under different operation scenarios such as irradiation changes, frequency changes, reactive power injection, and operation with a distorted grid. The results show that the DC-link voltage and the active and reactive powers are well regulated from the proposed control scheme without the measurement of the grid phase and frequency.

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confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonlinear Self-Synchronizing Current Control for Grid-Connected Photovoltaic Inverters

Alqatamin

McIntyre

2022

Energies

Self Cite

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“…A control strategy without PLL in αβ stationary coordinate system using improved multiple complex coefficient filters and a frequency self‐adaptation tracking algorithm has been implemented in Li et al, 18 but the control structure requires more complex coefficient filters and the coordinate transformation of the voltage and current is required. In Alqatamin et al, 19 a current control scheme without PLL is proposed to achieve the current tracking target and estimate the unknown grid parameters without grid voltage feedback, but coordinate transformation of the current is required. Bahrani 20 developed a control method without a PLL based on power synchronization for regulating its power exchange with the grid without detecting or adjusting the junction voltage but still requires coordinate transformation.…”

Section: Introductionmentioning

confidence: 99%

“…To solve the PLL problem, some methods have been developed in previous works. [16][17][18][19][20] In Guo et al, 16 the intrinsic causes of inverter current harmonics and power oscillations are quantitatively analyzed, and a control strategy is proposed that requires neither PLL nor voltage or current for positive or negative sequence extraction, but the method is only verified under the grid unbalance condition and coordinate transformation is necessary. A direct power control method without a PLL has been presented in Ma et al, 17 but the phase compensation requires additional coordinate transformation.…”

Section: Introductionmentioning

confidence: 99%

Control strategy without phase‐locked loop based on power estimation and natural frame for single‐phase cascaded H‐bridge converter

Zhang

Chen

Yang

et al. 2022

Circuit Theory & Apps

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Based on a single-phase cascaded H-bridge (CHB) multilevel converter, this paper investigates a control strategy combining power estimation and natural frame control (NFC) with the omission of grid voltage sensors. Besides, this control method, without phase-locked loop (PLL), can meet the continuous operation of the system and also eliminates grid voltage feedforward. First, natural frame control is introduced to derive the implementation process of control strategy without PLL, and the calculation formula of AC reference currents is given. Furthermore, the separate control of active and reactive currents is achieved. Second, the principle of proposed control algorithm is presented, and the sinusoidal voltage unit vector for synchronization can be accurately estimated. Next, considering the errors, the article corrects the method through parameter compensation. In addition, the balanced control method stabilized the DC side voltage of the converter. Finally, the effectiveness of this method is verified by computer simulation and experimental prototype.cascaded H-bridge (CHB), natural frame control (NFC), grid voltage sensors, phase-locked loop (PLL), power estimation

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Reduction in switching losses/DC bus requirement for a grid-connected inverter with minimal sensors using PMR-OCC

Satpathy,

2023

Electr Eng

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Current Control of a Three-Phase, Grid-Connected Inverter in the Presence of Unknown Grid Parameters Without a Phase-Locked Loop

Cited by 19 publications

References 37 publications

Nonlinear Self-Synchronizing Current Control for Grid-Connected Photovoltaic Inverters

Nonlinear Self-Synchronizing Current Control for Grid-Connected Photovoltaic Inverters

Control strategy without phase‐locked loop based on power estimation and natural frame for single‐phase cascaded H‐bridge converter

Reduction in switching losses/DC bus requirement for a grid-connected inverter with minimal sensors using PMR-OCC

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