A programmable cascaded LPF based PLL scheme for single-phase grid-connected inverters

Mnider, Abdalbaset M.; Atkinson, David; Dahidah, Mohamed; Zbede, Yaman B.; Armstrong, Matthew

doi:10.1109/irec.2016.7478935

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…However, the conventional PLL method is difficult to use in single-phase systems. In addition, if the cut-off frequency of the low pass filter is decreased to reduce the low frequency harmonics of the input power source, the total control bandwidth of the PLL will be reduced, which is disadvantageous to the sudden change of phase angle [17].…”

Section: Proposed Control Scheme Of 3-phase Ac/dc Pwm Converter Usingmentioning

confidence: 99%

A Study on Stability Control of Grid Connected DC Distribution System Based on Second Order Generalized Integrator-Frequency Locked Loop (SOGI-FLL)

Kang

Shin²,

Lee

et al. 2018

Applied Sciences

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This paper studies a second order generalized integrator-frequency locked loop (SOGI-FLL) control scheme applicable for 3-phase alternating current/direct current (AC/DC) pulse width modulation (PWM) converters used in DC distribution systems. The 3-phase AC/DC PWM converter is the most important power conversion system of DC distribution, since it can boost 380 Vrms 3-phase line-to-line AC voltage to 700 Vdc DC output with various DC load devices and grid voltages. The direct-quadrature (d-q) transformation, positive sequence voltage extraction, proportional integral (PI) voltage/current control, and phase locked loop (PLL) are necessary to control the 3-phase AC/DC PWM converter. Besides, a digital filter, such as low pass filter and all pass filter, are essential in the conventional synchronous reference frame-phase locked loop (SRF-PLL) method to eliminate the low order harmonics of input. However, they limit the bandwidth of the controller, which directly affects the output voltage and load of 3-phase AC/DC PWM converter when sever voltage fluctuation, such as sag, swell, etc. occurred in the grid. On the other hand, the proposed control method using SOGI-FLL is able to do phase angle detection, positive sequence voltage extraction, and harmonic filtering without additional digital filters, so that more stable and fast transient control is achieved in the DC distribution system. To verify the improvement of the characteristics in the unbalanced voltage and frequency fluctuation of the grid, a simulation and experiment are implemented with 50 kW 3-phase AC/DC PWM converter used in DC distribution.

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Section: Proposed Control Scheme Of 3-phase Ac/dc Pwm Converter Usingmentioning

confidence: 99%

A Study on Stability Control of Grid Connected DC Distribution System Based on Second Order Generalized Integrator-Frequency Locked Loop (SOGI-FLL)

Kang

Shin²,

Lee

et al. 2018

Applied Sciences

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“…However, this method causes double-frequency oscillatory errors. To solve this problem, notch filter-based PLL (NF-PLL) [4] and programmable cascaded low-pass filter-based PLL (PCLPF-PLL) [5] are proposed. But the dynamic response speed of the system is sacrificed due to the introduction of filters.…”

Section: Introductionmentioning

confidence: 99%

Development of Frequency Fixed Sliding Discrete Fourier Transform Filter Based Single-Phase Phase-Locked Loop

et al. 2021

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The single-phase phase-locked loop (PLL) is essential for the stable operation and control of single-phase grid-connected converters. However, in practical applications, the grid voltage is usually affected by harmonics and dc offset, which will cause errors in the output of the PLL. Therefore, using sliding discrete Fourier transform filter (SDFT) as a prefilter, this paper proposes an improved single-phase synchronous reference frame PLL with a fixed sampling frequency, which can accurately and quickly obtain the grid parameters under distorted grid conditions. Most importantly, the paper theoretically analyzes phase and amplitude errors generated by SDFT for the first time and a quantitative compensation method is proposed, which is straightforward to be used by a reader. Finally, the proposed PLL is compared with other PLLs through simulation and experiments. The experimental results show the effectiveness and practicability of the proposed method.INDEX TERMS Sliding discrete Fourier transform filter (SDFT), phase-locked loop (PLL), dc offset, harmonic.

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Implementation Oriented Two-Sample Phase Locked Loop for Single-Phase PFCs

Lamo

Ruiz

Azcondo

et al. 2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

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A low-resource-consuming digital implementation of the Two-Sample (2S) Phase Locked Loop (PLL) for low cost single-phase Power Factor Correction (PFC) converters is proposed. The design replaces trigonometric functions with an oscillator and divisions with approximations, without reducing the 2S-PLL synchronization capability. The proposal is evaluated and validated by simulation and experimentally.

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A programmable cascaded LPF based PLL scheme for single-phase grid-connected inverters

Cited by 6 publications

References 21 publications

A Study on Stability Control of Grid Connected DC Distribution System Based on Second Order Generalized Integrator-Frequency Locked Loop (SOGI-FLL)

A Study on Stability Control of Grid Connected DC Distribution System Based on Second Order Generalized Integrator-Frequency Locked Loop (SOGI-FLL)

Development of Frequency Fixed Sliding Discrete Fourier Transform Filter Based Single-Phase Phase-Locked Loop

Implementation Oriented Two-Sample Phase Locked Loop for Single-Phase PFCs

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