A Nonlinear Adaptive Synchronization Techniquefor Grid-Connected Distributed Energy Sources

Yazdani, D.; Bakhshai, Alireza; Joós, G.; Mojiri, M.

doi:10.1109/tpel.2008.926045

Cited by 165 publications

(59 citation statements)

References 29 publications

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“…The output of the dc voltage and current controller clamped is represented by the relations (16) and (17):…”

Section: K T K T K T = (16)mentioning

confidence: 99%

“…The controls of distributed generation systems have to meet the requirements for grid interconnection, for example UL1741, VDE0126, RD1663, DK5940 standards for antiislanding, voltage and frequency disconnect, current distortion, dc injection, synchronization, EMC immunity on protection functions [15]. At the ac port connection the DPGs have to monitor and qualify the available ac source (utility grid or genset) by synchronizing its phase and frequency prior to the transfer event [3], [16].…”

Section: Introductionmentioning

confidence: 99%

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A Control Strategy for a Distributed Power Generation Microgrid Application With Voltage- and Current-Controlled Source Converter

Serban

2010

IEEE Trans. Power Electron.

176

100

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Abstract-This paper presents a pseudo-droop control structure integrated within a microgrid system through Distributed Power Generation modules capable to function in off-grid islanded, gensetconnected and grid-connected modes of operation. System efficiency has an important role in order to harvest the maximum available renewable energy from DC or AC sources whilst providing power backup capability. A control strategy is proposed in off grid islanded mode method based on the microgrid line frequency control as agent of communication for energy control between the DPG modules. A critical case is where the AC load demand could be lower than the available power from the photovoltaic solar array where the battery bank can be overcharged with unrecoverable damage consequences. The DPG voltage forming module controls the battery charge algorithm with a frequency generator function and the DPG current source module controls its output current through a frequency detection function. The physical installation between DPG modules is independent since no additional communication wiring is needed between power modules which represent another integration advantage within the microgrid type application.

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“…The output of the dc voltage and current controller clamped is represented by the relations (16) and (17):…”

Section: K T K T K T = (16)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Control Strategy for a Distributed Power Generation Microgrid Application With Voltage- and Current-Controlled Source Converter

Serban

2010

IEEE Trans. Power Electron.

176

100

View full text Add to dashboard Cite

show abstract

“…In the literature, a large number of single-phase grid synchronization techniques have been proposed. Discrete Fourier transform [6], zero-crossing detection [7], Kalman filtering [8], least-squares estimation algorithm [9], artificial neural network [10], adaptive notch filter [11], complex-vector filter [12], and phase-locked loop (PLL) [13]- [25] are some of them. Among these reported grid synchronization approaches, PLLs have become the most widely used solutions.…”

Section: Introductionmentioning

confidence: 99%

A Novel Open-Loop Frequency Estimation Method for Single-Phase Grid Synchronization Under Distorted Conditions

Fang

Dong

et al. 2017

IEEE J. Emerg. Sel. Topics Power Electron.

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Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.2168-6777 (c) 2016 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Abstract-In this paper, a new open-loop architecture with good dynamic performance and strong harmonic rejection capability is proposed for single-phase grid synchronization under distorted conditions. Different from previous single-phase grid synchronization algorithms based on the phase locked loop (PLL) technique, the proposed method is to estimate the frequency and phase angle of the grid voltage in an open-loop manner so that fast dynamic response and enhanced system stability can be achieved. Firstly, an open-loop frequency estimation algorithm is introduced under ideal grid condition. Then, it is extended to distorted grid voltages through the combination of the developed frequency estimation unit and a pre-filtering stage consisting of a second-order lowpass filter and a cascaded delayed signal cancellation (DSC) module. In addition, a transient process smoothing (TPS) unit is designed to achieve smooth frequency transients in cases where the grid voltage experiences fast and large changes. The working principle of the new frequency estimation algorithm and the developed single-phase grid synchronization approach is given in detail, together with some simulation and experiment results for verifying their performance.

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“…In recent years, various estimation methods of grid voltage parameters have been proposed, such as discrete Fourier transform [1], [2], fast Fourier transform [3], Kalman filtering [4], zero-crossing detection [5], [6], least squares estimation [7], adaptive estimation [8], artificial neural networks [9], adaptive notch filter [10]- [13], complex vector filter [14], and phase-locked loop (PLL) [15], [16].…”

Section: Introductionmentioning

confidence: 99%

Accurate Voltage Parameter Estimation for Grid Synchronization in Single-Phase Power Systems

Dai¹,

Lin²,

Tian³

et al. 2016

Journal of Power Electronics

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This paper presents an adaptive observer-based approach to estimate voltage parameters, including frequency, amplitude, and phase angle, for single-phase power systems. In contrast to most existing estimation methods of grid voltage parameters, in this study, grid voltage is treated as a dynamic system related to an unknown grid frequency. Based on adaptive observer theory, a full-order adaptive observer is proposed to estimate voltage parameters. A Lyapunov function-based argument is employed to ensure that the proposed estimation method of voltage parameters has zero steady-state error, even when frequency varies or phase angle jumps significantly. Meanwhile, a reduced-order adaptive observer is designed as the simplified version of the proposed full-order observer. Compared with the frequency-adaptive virtual flux estimation, the proposed adaptive observers exhibit better dynamic response to track the actual grid voltage frequency, amplitude, and phase angle. Simulations and experiments have been conducted to validate the effectiveness of the proposed observers.

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A Nonlinear Adaptive Synchronization Techniquefor Grid-Connected Distributed Energy Sources

Cited by 165 publications

References 29 publications

A Control Strategy for a Distributed Power Generation Microgrid Application With Voltage- and Current-Controlled Source Converter

A Control Strategy for a Distributed Power Generation Microgrid Application With Voltage- and Current-Controlled Source Converter

A Novel Open-Loop Frequency Estimation Method for Single-Phase Grid Synchronization Under Distorted Conditions

Accurate Voltage Parameter Estimation for Grid Synchronization in Single-Phase Power Systems

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