Designing a Second Order Generalized Integrator Digital Phase Locked Loop based on a Frequency Response Approach

Busarello, Tiago Davi Curi; Zeb, Kamran; Péres, Adriano; Oruganti, Venkata Subrahmanya Raghavendra Varaprasad; Simões, Marcelo Godoy

doi:10.1109/isgt-la.2019.8895304

Cited by 10 publications

(8 citation statements)

References 27 publications

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“…Considering the system parameters, the gains for sFAO 0,1 are taken from [1] and the ones for sFAO ∅,n are copied from [18]. For the proposed mFAO 0,n , pole placement as in (9) is performed such that all poles and eigenvalues of J are shifted by −2 into the negative half plane which is a reasonable compromise between noise sensitivity, overshooting and estimation speed. All system parameters are listed in Tab.…”

Section: Implementation and Measurement Resultsmentioning

confidence: 99%

“…To take appropriate countermeasures, firstly these distortions must be identified as fast and precise as possible to protect users from malfunctioning equipment and to prevent destruction of electronic devices. Therefore, in the recent years, much effort has been put into this research question field which resulted in the development of Second-Order Generalized Integrators (SOGI)s [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12].…”

Section: Motivation and Literature Reviewmentioning

confidence: 99%

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A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

Hackl¹

2020

Preprint

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A unified method is presented which allows to estimate all harmonic components, DC-offset and fundamen- tal frequency in arbitrarily distorted single-phase grids us- ing a frequency-adaptive observer (FAO) consisting of modi- fied Second-Order Generalized Integrators (mSOGIs), a DC- Integrator (DCI) and a modified Frequency Locked Loop (mFLL). DCI and mSOGIs are tuned by pole placement which allows for an arbitrarily fast detection of DC-offset and harmonic components if the fundamental frequency is known. If the fundamental frequency must be estimated as well, a mFLL with Gain Normalization (GN), Rate Limitation (RL), Anti-Windup (AW) strategy and low-pass filters (LPF) must be employed. The effectiveness of the proposed FAO is validated by experimental results and its enhanced performance is shown by comparisons to existing estimation methods.

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Section: Implementation and Measurement Resultsmentioning

confidence: 99%

Section: Motivation and Literature Reviewmentioning

confidence: 99%

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

Hackl¹

2020

Preprint

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“…The DSC has an ADC with a sampler and zero-order holder (ZOH). The PCC voltage passes in a PLL [22,23] to generate a synchronized reference signal. The reference is compared to the inverter output current.…”

Section: Novelties and Goalsmentioning

confidence: 99%

Highly Accurate Digital Current Controllers for Single-Phase LCL-Filtered Grid-Connected Inverters

2020

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Photovoltaic (PV) systems are the most promising technology for residential installation as an alternative source of energy. To interface the primary source of PV to the electrical grid, an LCL-filtered inverter is being broadly adopted due to its low volume compared to the L-filtered one and the superior ability to filter high-frequency harmonics. In this context, this paper proposes highly accurate digital current controllers for single-phase LCL-filtered grid-connected inverters. The proposed controllers are: Integral-single-lead, integral double-lead, integral double-lead taking into account the effect of pulse width modulation (PWM) delay and the proportional-resonant (PR). These controllers are different from the traditional Proportional-Integral (PI), Proportional-Derivative (PD), and Proportional-Integral-Derivative (PID). One of the novelties of this paper is the detailed, step-by-step procedure for tuning each parameter of the proposed digital controllers considering the dynamic behavior of the LCL filter. The proposed PR has a different and more straightforward tuning methodology than those procedures commonly found in the literature. Therefore, this paper is an attractive tool for a fast, accurate, and reliable way to tune digital current controllers for a single-phase LCL-filtered grid-connected inverter. The controllers were verified in the digital signal controller (DSC) TMS320F28335 while the power structure runs in a hardware-in-loop (HIL device). Results show the efficacy of the proposed controllers.

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“…Observe the inverse weighting of y ν 1 by g ν 1 and q ν 1 by −k ν 1 . The adaption in (11) estimate ω for all positive gains γ(t) > 0. The initial value ω 0 helps to improve the transient behavior of the mFLL; e.g.…”

Section: E Frequency Adaption By Modified Fll (Mfll)mentioning

confidence: 99%

“…To take appropriate countermeasures, firstly these distortions must be identified as fast and precise as possible to protect users from malfunctioning equipment and to prevent destruction of electronic devices. Therefore, in the recent years, much effort has been put into this research question which resulted in the development of Second-Order Generalized Integrators (SOGIs) [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16].…”

mentioning

confidence: 99%

A Unified Method for Generic Signal Parameter Estimation of Arbitrarily Distorted Single-Phase Grids With DC-Offset

Hackl

Landerer

2020

IEEE Open J. Ind. Electron. Soc.

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A unified method is presented which allows to estimate dc-offset, all harmonic components and fundamental frequency in arbitrarily distorted single-phase grids using a Frequency Adaptive Observer (FAO) consisting of modified Second-Order Generalized Integrators (mSOGIs), an adaptive DC-Integrator (DCI) and a modified Frequency Locked Loop (mFLL). DCI and mSOGIs are tuned by pole placement which allows for an arbitrarily fast detection of dc-offset and harmonic components if the fundamental frequency is known. If the fundamental frequency must be estimated as well, an mFLL with Gain Normalization (GN), Rate Limitation (RL), Anti-Windup (AW) strategy and low-pass filters (LPF) must be employed. The effectiveness of the proposed FAO is validated by experimental results and its enhanced performance is shown and compared to existing estimation methods. INDEX TERMS dc-offset estimation, frequency adaptive observer; frequency estimation; frequency locked loop; harmonics estimation; second-order generalized integrator.

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Designing a Second Order Generalized Integrator Digital Phase Locked Loop based on a Frequency Response Approach

Cited by 10 publications

References 27 publications

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

A unified method for signal parameter estimation of arbitrarily distorted single-phase grids with DC-offset

Highly Accurate Digital Current Controllers for Single-Phase LCL-Filtered Grid-Connected Inverters

A Unified Method for Generic Signal Parameter Estimation of Arbitrarily Distorted Single-Phase Grids With DC-Offset

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