Influence of Plugging DC Offset Estimation Integrator in Single-Phase EPLL and Alternative Scheme to Eliminate Effect of Input DC Offset and Harmonics

Wu, Fengjiang; Sun, Dongyang; Zhang, Lujie; Duan, Jiandong

doi:10.1109/tie.2015.2405496

Cited by 50 publications

(20 citation statements)

References 21 publications

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“…For the purpose of comparison, the advanced PLLs, CDSC-EPLL [22] and MHDC-PLL [23], are tested as well. These three methods are tested under distorted voltages and under other grid disturbances such as phase jump, voltage sag and frequency variation.…”

Section: Simulation Resultsmentioning

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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Section: Simulation Resultsmentioning

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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“…Amount of change in velocity of particles (18) Notice that the direction of particles is typically decided by the second and third term in (18). In the absence of these two terms, particles tend to move in the same direction until boundary condition is fully satisfied.…”

Section: Methodology Employed For Determining the Optimal Pi-4vpi Curmentioning

confidence: 99%

“…The DSOGI-PLL employed in this paper has the capability to detect the positive sequence component and thereby grid synchronising angle (Φ) under input grid voltage distortion and unbalancing. In addition, it minimises the adverse effect of DC component and exhibits a unique ability to handle the voltage and frequency variations adequately [18]. Moreover, to analyse the influence of these measurement errors on the electric grid current performance, the SR frame in-phase and quadrature unit vector voltages can be represented as…”

Section: Impacts Of Dc-offset Measurement Error and Control Algorithmmentioning

confidence: 99%

Optimised PI‐4VPI current controller for three‐phase grid‐integrated photovoltaic inverter under grid voltage distortions

Patel

Kumar

Gupta

et al. 2020

IET Renewable Power Generation

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This study aims to propose optimised and robust current controller for the transformerless grid-integrated photovoltaic inverter. Challenge of ensuring improved power quality while minimising the DC-component under non-ideal grid condition is at the forefront in the photovoltaic system. In this context, an advanced current controller is designed and developed in the stationary reference frame with proportional-integral (PI) plus four-vector PI (4VPI) controllers. The PI-controller modulates the shape of fundamental current to follow its reference induced from outer DC-link loop. Meanwhile, 4VPI controllers are tuned at the multiple of grid frequencies including third-(3ω 0), fifth-(5ω 0), seventh-(7ω 0), and ninth-(9ω 0) to introduce infinite gain and thereby alleviating stationary errors in the current loop of the photovoltaic inverter. The most distinguishing feature of the proposed controller is its inherent control robustness, and therefore, it operates satisfactorily against control delay time and frequency excursion. Traditionally, cumbersome trial-and-error techniques have been largely employed to adjust the PI-VPI controller gains. Nonetheless, tuning of these parameters has made many practitioners switch-off from employing the proposed controller. Given this, the particle swarm optimisation algorithm is proposed. Finally, the practicality of the proposed controller is verified through comprehensive set of simulation and experimental tests conducted on a laboratory-developed prototype using dSPACE-1104.

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“…When (1) and (2) to switch to NPCI mode. The proportional-resonant control (PRC) [24] is used to control the grid current and the enhanced phase-locked loop (EPLL) [25] is used to detect the synchronous information of the grid.…”

Section: Overall Control Configuration Of the Mcnpc-gcimentioning

confidence: 99%

Principle and Control of Modified Cascaded NPC-GCI With Variable Topology Ability to Enhance European Efficiency

Gooi

2017

IEEE Trans. Ind. Electron.

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This paper proposes a modified cascaded neutral-point-clamped grid-connected inverter (MCNPC-GCI) to achieve a wide operational range and high European efficiency in the photovoltaic generation system. Two bidirectional thyristors are added into the standard single-phase cascaded NPC inverter to respectively connect the positive and negative poles of the two NPC inverters to achieve the transformation between the cascaded NPC inverter and the equivalent single NPC inverter. The losses and grid current total harmonics distortions of the two topology modes are derived to determine their optimal operational ranges and an approach of online smoothly switching the two topology modes is proposed. Detailed experimental results of the proposed MCNPC-GCI are shown to verify its accuracy and feasibility.

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Influence of Plugging DC Offset Estimation Integrator in Single-Phase EPLL and Alternative Scheme to Eliminate Effect of Input DC Offset and Harmonics

Cited by 50 publications

References 21 publications

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

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

Optimised PI‐4VPI current controller for three‐phase grid‐integrated photovoltaic inverter under grid voltage distortions

Principle and Control of Modified Cascaded NPC-GCI With Variable Topology Ability to Enhance European Efficiency

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