Online Wavelet Transform-Based Control Strategy for UPQC Control System

Forghani, Mohammad Ali; Afsharnia, Saeed

doi:10.1109/tpwrd.2006.883026

Cited by 104 publications

(51 citation statements)

References 21 publications

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“…If fu indicates the lowest frequency range which only contains the DC component of the original signal, and fs represents the signal sampling rate, then the needed lifting blocks to extract the DC signal are defined as follows [31]:…”

Section: Lowest Bandpass Frequencymentioning

confidence: 99%

Proposing Wavelet-Based Low-Pass Filter and Input Filter to Improve Transient Response of Grid-Connected Photovoltaic Systems

Rahmani

2016

Energies

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Available photovoltaic (PV) systems show a prolonged transient response, when integrated into the power grid via active filters. On one hand, the conventional low-pass filter, employed within the integrated PV system, works with a large delay, particularly in the presence of system's low-order harmonics. On the other hand, the switching of the DC (direct current)-DC converters within PV units also prolongs the transient response of an integrated system, injecting harmonics and distortion through the PV-end current. This paper initially develops a wavelet-based low-pass filter to improve the transient response of the interconnected PV systems to grid lines. Further, a damped input filter is proposed within the PV system to address the raised converter's switching issue. Finally, Matlab/Simulink simulations validate the effectiveness of the proposed wavelet-based low-pass filter and damped input filter within an integrated PV system.

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Section: Lowest Bandpass Frequencymentioning

confidence: 99%

Proposing Wavelet-Based Low-Pass Filter and Input Filter to Improve Transient Response of Grid-Connected Photovoltaic Systems

Rahmani

2016

Energies

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“…These functionalities can be carried out by applying diverse control strategies which can operate in the time domain, in the frequency domain or both [5]. Time domain methods, such as pq or dq based methods [6]- [8], allow the fast compensation of time-variant disturbances but make more complex their selective compensation.…”

Section: Introductionmentioning

confidence: 99%

Unified power quality conditioner (UPQC) with voltage dips and over-voltages compensation capability

Moreno¹,

Pigazo²,

Liserre³

et al. 2024

RE&PQJ

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Unified power quality conditioners (UPQCs) allow the mitigation of voltage and current disturbances that could affect sensitive electrical loads while compensating the load reactive power. Diverse control techniques have been proposed to evaluate the instantaneous output voltage of the series active power filter of the UPQC but, in most cases, these controllers only can compensate a kind of voltage disturbance. This paper proposes a new digital controller for UPQCs which allows the load current harmonics and reactive power to be compensated at the grid side while avoiding the effect of voltage dips, over-voltages and voltage harmonics on the local loads. The controller characteristics can be established on-line without changing its basic structure. The performance of the proposed controller has been evaluated through simulation tests.

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“…Usually, series and shunt inverter integrated device is called Unified Power Quality Conditioner (UPQC). An effective control strategy is presented to extract the compensating signals for the control of the proposed system [2]- [6]. The UPQC has the prominent capability of improving the quality of voltage and current at the point of installation on power distribution systems or industrial power systems.…”

Section: Introductionmentioning

confidence: 99%

Combined operation of UPQC and fuel cell with common DC bus

Ale-Emran¹,

Forghani²,

Abedi³

et al. 2024

RE&PQJ

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Abstract.In this paper analysis results of a cooperation of the unified power quality conditioner with the fuel cell units are presented. A comprehensive control strategy is introduced to extract the compensating signals for the control of the proposed system. The used control strategy can extract the reference currents and voltages of UPQC fast and accurately in the presence of harmonics and/or frequency oscillation. The proposed scheme can compensate voltage sag, voltage interruption and harmonics at the Point of Common Coupling (PCC) on power distribution system. The simulation results prove the efficiency of using the presented method on power quality improvement.

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Online Wavelet Transform-Based Control Strategy for UPQC Control System

Cited by 104 publications

References 21 publications

Proposing Wavelet-Based Low-Pass Filter and Input Filter to Improve Transient Response of Grid-Connected Photovoltaic Systems

Proposing Wavelet-Based Low-Pass Filter and Input Filter to Improve Transient Response of Grid-Connected Photovoltaic Systems

Unified power quality conditioner (UPQC) with voltage dips and over-voltages compensation capability

Combined operation of UPQC and fuel cell with common DC bus

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