Power System Frequency Estimation of Sine-Wave Corrupted With Noise by Windowed Three-Point Interpolated DFT

Wen, He; Li, Chengcheng; Yao, Wenxuan

doi:10.1109/tsg.2017.2682098

Cited by 60 publications

(23 citation statements)

References 28 publications

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“…Frequency-domain algorithms for harmonic component extraction include Discrete Fourier Transform (DFT) [42], Fast Fourier transform (FFT) [43][44][45][46], Recursive Discrete Fourier Transform (RDFT), Kalman filter, and others [47]. These algorithms are characterized by high computational complexity and, in transient processes, a method error occurs because the Fourier transform requires an entire period or an integral multiple for reference computation.…”

Section: Reference Current Estimation Methodsmentioning

confidence: 99%

Design of a Measuring System for Electricity Quality Monitoring within the SMART Street Lighting Test Polygon: Pilot Study on Adaptive Current Control Strategy for Three-Phase Shunt Active Power Filters

Martínek

Bilík

Baroš

et al. 2020

Sensors

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This study focuses on the design of a measuring system for monitoring the power quality within the SMART street lighting test polygon at university campuses with relation to testing an adaptive current control strategy for three-phase shunt active power filters. Unlike conventional street lighting, SMART elements are powered 24/7. Due to the electronic character of the power part of such mass appliances, there are increased problems with the power quality of the electric energy. Compared to the current concept of street lighting, there is a significant increase in the content of higher current harmonic components, which cause several problems in the distribution system. The test polygon contains 16 luminaires made by various manufacturers and mounted with various SMART components. Using the polygon control and monitoring system, dynamic load scenarios were selected. These scenarios tested the possibilities of different adaptive current control strategies for three-phase shunt active power filters to improve the power quality of electricity. This study focuses on three adaptive algorithms that respond to dynamic changes of current harmonics level in real-time. The possibility of active filter control was tested using FPGA, mainly due to the low latency of the filter control part.

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Section: Reference Current Estimation Methodsmentioning

confidence: 99%

Design of a Measuring System for Electricity Quality Monitoring within the SMART Street Lighting Test Polygon: Pilot Study on Adaptive Current Control Strategy for Three-Phase Shunt Active Power Filters

Martínek

Bilík

Baroš

et al. 2020

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is well known, DFT is accurate only when the sampling period is satisfied with the Nyquist sampling criterion and the sampling period is an integer number of the signal period [22], [23]. When the signal frequency is not integral multiples of the frequency resolution f sp /N , the signal frequency is located in the adjacent two peaks of the main lobe instead of in the center of the main lobe (see Fig.…”

Section: A Goertzel Algorithmmentioning

confidence: 99%

“…Thus, the error arises as the result of the leakage and picket fence effect. Regardless of using any type of window functions, leakage effect always more or less exists in the DFT, but the picket fence effects can be eliminated using an interpolation algorithm [23]. The Goertzel algorithm is employed to calculate the DFT values and the signal analysis frequency is kf sp /N .…”

Section: A Goertzel Algorithmmentioning

confidence: 99%

Sensorless Speed Estimation of an Inverter-Fed Induction Motor Using the Supply-Side Current

Song

Wang

et al. 2019

IEEE Trans. Energy Convers.

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“…Due to merits such as having no need for load reform, good compensation sampling rate is inconvenient for the control system in practical applications, for many discrete filtering and control parameters should vary with the sampling frequency change to ensure performance and stability. Secondly, in [33,41,42], the interpolating windowed DFT was used to eliminate the errors caused by the spectrum leakage and the picket fence effect. The interpolating algorithm can eliminate errors caused by the picket fence effect, and windowing the signals can reduce the errors produced by the leakage effect.…”

Section: Introductionmentioning

confidence: 99%

Applying Directly Modified RDFT Method in Active Power Filter for the Power Quality Improvement of the Weak Power Grid

Hou

Song

et al. 2020

Energies

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The recursive discrete Fourier transformation (RDFT) method can be used for grid voltage phase-locking and harmonic current detection in a shunt active power filter (SAPF). However, in weak power grids such as microgrids, significant errors might occur in the amplitude and phase detection due to grid frequency deviation. In this study, to resolve this problem, a directly modified RDFT (DMRDFT) method is proposed for SAPF weak grid application. Through theoretical analysis, the errors of phase and amplitude detection were found to consist of fixed error and fluctuating error. The fixed error is only determined by frequency deviation, whereas the fluctuating error is also related to the recursive pointer and the initial phase. The DMRDFT algorithm can obtain the real grid frequency through the calculation of the phase angle difference for two consecutive periods. Then it can employ the grid frequency deviation and the recursive pointer value to directly correct the detection results gathered by the conventional RDFT algorithm. As a result, DMRDFT can yield accurate amplitude and phase information of the grid voltage or current with a simple calculation. Simulation results verify the high precision of the proposed DMRDFT method in both steady and dynamic situations. Experimental results show that the DMRDFT method can significantly increase the SAPF compensation performance when grid frequency shifts.

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Power System Frequency Estimation of Sine-Wave Corrupted With Noise by Windowed Three-Point Interpolated DFT

Cited by 60 publications

References 28 publications

Design of a Measuring System for Electricity Quality Monitoring within the SMART Street Lighting Test Polygon: Pilot Study on Adaptive Current Control Strategy for Three-Phase Shunt Active Power Filters

Design of a Measuring System for Electricity Quality Monitoring within the SMART Street Lighting Test Polygon: Pilot Study on Adaptive Current Control Strategy for Three-Phase Shunt Active Power Filters

Sensorless Speed Estimation of an Inverter-Fed Induction Motor Using the Supply-Side Current

Applying Directly Modified RDFT Method in Active Power Filter for the Power Quality Improvement of the Weak Power Grid

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