Implementation of MLI and THD analysis for grid connected PV system and simulation study of voltage stability with change in grid impedance

Poovarasan, P.; Saraswathi, Pandian

doi:10.1109/iccpct.2015.7159400

Cited by 1 publication

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References 9 publications

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“…The output harmonic currents are significantly affected by the light and temperature conditions. The simulation results in [10] show that the total harmonic distortion (THD) decreases significantly when the level number of the modular multi-level converter (MMC) in the PVGS increases. A state-space model is established in [11] to analyze the harmonic interactions between the AC and DC sides as well as the harmonic inability of the PVGS.…”

Section: Introductionmentioning

confidence: 99%

Interharmonic Analysis Model of Photovoltaic Grid-connected System with Extended Dynamic Phasors

Zhong

Qiu

Zhao

et al. 2021

Journal of Modern Power Systems and Clean Energy

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The interactions between randomly fluctuating power outputs from photovoltaic (PV) at the DC side and background voltage distortions at the AC side could generate interharmonics in the PV grid-connected system (PVGS). There is no universal method that can reveal the transmission mechanism of interharmonics and realize accurate calculation in different scenarios where interharmonics exist in the PVGS. Therefore, extended dynamic phasors (EDPs) and EDP sequence components (EDPSCs) are employed in the interharmonic analysis of the PVGS. First, the dynamic phasors (DPs) and dynamic phasor sequence components (DPSCs) are extended into EDPs and EDPSCs by selecting a suitable fundamental frequency other than the power frequency. Second, an interharmonic analysis model of the PVGS is formulated as a set of state space equations. Third, with the decoupling characteristics of EDPSCs, generation principles and interactions among the interharmonics in the PVGS are presented by the sequence components, and its correctness is verified by simulation and experiment. The presented model can be used to accurately calculate the interharmonics generated in the PVGS both at the AC and DC sides. Because of the decoupling among the EDPSCs, the set of state space equations can effectively describe the principle.

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Section: Introductionmentioning

confidence: 99%