Design and Analysis of a Power Quality Improvement System for Photovoltaic Generation Based on LCL-Type Grid Connected Inverter

Hosseinpour, M.; Dastgiri, A.; Shahparasti, M.

doi:10.5829/ije.2024.37.02b.04

Cited by 2 publications

(1 citation statement)

References 24 publications

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“…In general, resonance damping methods arising from LCL filters are divided into two categories: active damping methods 13,14 and passive damping methods 15 . Active damping methods are more favored due to their lower power losses, efficiency, and greater flexibility compared to passive damping methods.…”

Section: Introductionmentioning

confidence: 99%

Grid‐tied PEMFC power conditioning system based on capacitor voltage thorough feedback procedure in a weak and harmonics‐polluted network

Hosseinpour,

Sabetfar,

Shahparasti

2023

Energy Science & Engineering

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Proton exchange membrane fuel cells (PEMFC) have been noticed by researchers due to their high efficiency, low pollution, and high‐power density in distributed generation systems. In this paper, an LCL‐type grid‐tied PEMFC fuel cell power conditioning system is evaluated in a harmonics‐polluted low‐voltage grid. The LCL‐filters can lead to resonance and instability despite their capability to attenuate harmonics. In this research, a transformer has been used to connect the fuel cell inverter to the grid. The grid‐side inductor of LCL‐filter is realized by the leakage inductance of the transformer. In addition, for more effective resonance damping and attenuation of current ripples caused by the grid voltage harmonics, a capacitor voltage comprehensive feedback control has been designed and investigated. The comprehensive feedback control of the capacitor voltage contains proportional, first and second‐order derivative terms. In the proposed control scheme, the capacitor‐current‐feedback is opposed by the capacitor voltage derivative term due to reverse loop gain, which leads to deleting both of these loop gains. As a result, there is no need to utilize a current sensor in this control method. Consequently, the proportional and second‐order derivative terms of the capacitor voltage attenuate the LCL‐filter resonance. A low‐pass filter is also considered in the second‐order derivative loop in the controllable frequency range to ensure system stability. The simulation results of the PEMFC power conditioning system in different conditions confirm the proper attenuation of LCL resonance of grid‐tied inverter, high‐quality current injection to the harmonics polluted grid, the suitable stability, and the appropriate dynamic response for the proposed system. Under the proposed control scheme, the fuel cell power conditioning system demonstrates satisfactory stability. Even when reducing the LCL filter values by 5%–20%, the system maintains its stability effectively. Moreover, the THD of the injected current into the grid, employing the proposed control strategy, has been successfully reduced to an impressive value of 1.97% in a weak and harmonical grid.

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Section: Introductionmentioning

confidence: 99%

Grid‐tied PEMFC power conditioning system based on capacitor voltage thorough feedback procedure in a weak and harmonics‐polluted network

Hosseinpour,

Sabetfar,

Shahparasti

2023

Energy Science & Engineering

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Influence of Grid Integration of UPQC with Solar Power on Power Quality

Yasir Ghazi Rashid,

Raghad Ali Mejeed,

Ali Najim Abdullah

2024

Proc. eng. technol. innov.

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To satisfy the expanding usage of power electronics in grid-integrated applications, an unified power quality conditioner (UPQC) is regarded as an effective power tool contributing to power quality issues. Voltage interruption problems remain unresolved even if UPQC handles current harmonics and voltage sag/swell. This study proposes a solar energy-based UPQC to export active power to the grid. The suggested method utilizes photovoltaic (PV) power for power quality management and a boost converter to send the remaining active power back into the grid. The PV-UPQC configuration’s operation is simulated using MATLAB/Simulink. The PV-UPQC system can compensate for resultant harmonics, correct voltage sags, swells, and the maintenance of load voltage at its nominal value in addition to actively supplying the power grid. A considerable decline is observed in the THD of the load current from 104.66% to 2.56%. Conversely, a 97.55% decrease in load current THD is achieved.

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Design and Analysis of a Power Quality Improvement System for Photovoltaic Generation Based on LCL-Type Grid Connected Inverter

Abstract: Resonance frequency of the state in which the grid inductance is zero. (kHz) g v Grid RMS line voltage (V) swR f Actual value of switching frequency (kHz)

Cited by 2 publications

References 24 publications

Grid‐tied PEMFC power conditioning system based on capacitor voltage thorough feedback procedure in a weak and harmonics‐polluted network

Grid‐tied PEMFC power conditioning system based on capacitor voltage thorough feedback procedure in a weak and harmonics‐polluted network

Influence of Grid Integration of UPQC with Solar Power on Power Quality

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