A Controlled Filtering Method for Estimating Harmonics of Off-Nominal Frequencies

Marques, Charles Henrique Dias; Ribeiro, Moisés V.; Duque, Carlos A.; Ribeiro, Paulo F.; Silva, Eduardo A. B. da

doi:10.1109/tsg.2011.2174259

Cited by 35 publications

(20 citation statements)

References 26 publications

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“…Low-order infinite-impulse-response (IIR) or high-order FIR LPFs can be used for rejecting high frequency oscillations, as represented by D and Q, generated by the quadrature demodulations [32,33,35,36]. The IIR LPF is computationally efficient and also offers good attenuation at stop-band.…”

Section: B Design Of Lpfsmentioning

confidence: 99%

“…However, it shows slower dynamic response and has difficulties for hardware implementation due to stability issue [32,33,35]. To overcome these shortcomings of the IIR LPF, the FIR LPF can be used at the cost of a higher computational burden for real-time implementation [33,36].…”

Section: B Design Of Lpfsmentioning

confidence: 99%

“…Moreover, they contain interdependent loop, thus tuning is sensitive and reduces the stability margin. On the other side, low-pass filter (LPF) used in a demodulation method tuned at a fixed frequency may attenuate amplitude and introduce phase error during off-nominal frequency condition [32][33][34][35][36]. These errors can be avoided by using a frequency adaptive demodulation method [35,36].…”

Section: Introductionmentioning

confidence: 99%

“…On the other side, low-pass filter (LPF) used in a demodulation method tuned at a fixed frequency may attenuate amplitude and introduce phase error during off-nominal frequency condition [32][33][34][35][36]. These errors can be avoided by using a frequency adaptive demodulation method [35,36]. In this case, a separate frequency estimation algorithm can be used, but it increases the computational burden of the technique [35,36].…”

Section: Introductionmentioning

confidence: 99%

“…These errors can be avoided by using a frequency adaptive demodulation method [35,36]. In this case, a separate frequency estimation algorithm can be used, but it increases the computational burden of the technique [35,36]. To avoid the separate frequency estimation algorithm, an interdependent loop can be included in the demodulation method for feeding back the estimated frequency [37].…”

Section: Introductionmentioning

confidence: 99%

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A Demodulation-Based Technique for Robust Estimation of Single-Phase Grid Voltage Fundamental Parameters

Reza

Agelidis

2017

IEEE Trans. Ind. Inf.

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This paper proposes a robust technique for the single-phase grid voltage fundamental amplitude, frequency and phase angle estimation under distorted grid conditions. It is based on a demodulation method tuned at a fixed frequency. It does not have stability issue due to an open loop structure, does not require real-time evaluation of trigonometric and inverse trigonometric functions, and also avoids the use of look-up table. It can provide accurate estimation of the singlephase grid voltage fundamental parameters under DC offset and harmonics. When compared with a frequency adaptive demodulation technique, the proposed one is less affected by DC offset, can provide faster frequency estimation and also avoids interdependent loop, trigonometric and inverse trigonometric functions operation. Simulation and experimental results are presented to verify the performance of the proposed technique.

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Section: B Design Of Lpfsmentioning

confidence: 99%

Section: B Design Of Lpfsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Demodulation-Based Technique for Robust Estimation of Single-Phase Grid Voltage Fundamental Parameters

Reza

Agelidis

2017

IEEE Trans. Ind. Inf.

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Estimation of Electrical Parameters

2013

Power Systems Signal Processing for Smart Grids

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A novel islanding fault detection for distributed generation systems

Yang

Han

2013

Intl J Robust & Nonlinear

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SUMMARY This paper proposes a novel islanding fault detection method for distributed generation systems. Islanding fault detection of distributed generation systems in microgrids and smart grids is an essential security technology. The existing methods for islanding fault detection can be classified as passive methods (such as under/over voltage detection, under/over frequency detection, and voltage phase jump detection, based on natural effects of islanding) and active methods (impedance measurement, slip mode frequency shift, Sandia frequency shift and so on). Once the power consumed by a local load matches the power generated by a local inverter, the islanding phenomenon will be not obvious, and traditional passive methods may fail. In contrast, the active methods can overcome this disadvantage. However, active methods create extra disturbances that may degrade the quality of power generated by the inverter. By reducing the harmonics of the inverter output, coupled with the use of a novel filtering method, the proposed approach can be achieved without additional disturbance and does no nondetection zone islanding detection. In this paper, current harmonic compensation is applied to inverter control to minimize the inverter output harmonics, highlighting on the grid harmonics. Set‐membership filter is developed to estimate the voltage harmonics. Islanding condition is detected by the changes of the specific order harmonics. The effectiveness of the proposed method is demonstrated by simulations. A Kalman filter contrast experiment is presented to confirm that the set‐membership filter can more effectively detect islanding. Copyright © 2013 John Wiley & Sons, Ltd.

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A Controlled Filtering Method for Estimating Harmonics of Off-Nominal Frequencies

Cited by 35 publications

References 26 publications

A Demodulation-Based Technique for Robust Estimation of Single-Phase Grid Voltage Fundamental Parameters

A Demodulation-Based Technique for Robust Estimation of Single-Phase Grid Voltage Fundamental Parameters

Estimation of Electrical Parameters

A novel islanding fault detection for distributed generation systems

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