ANALYSIS OF INFLUENCING FACTORS AND MECHANISM OF PHOTOVOLTAIC COLLECTION SYSTEM VOLTAGE IMBALANCE

Zhang Jianpo; Chai Xinru; Gao Benfeng; Tian Xincheng; Cui Haojiang

doi:10.19912/j.0254-0096.tynxb.2023-1358

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (12) : 67-76. DOI: 10.19912/j.0254-0096.tynxb.2023-1358

ANALYSIS OF INFLUENCING FACTORS AND MECHANISM OF PHOTOVOLTAIC COLLECTION SYSTEM VOLTAGE IMBALANCE

Zhang Jianpo¹, Chai Xinru¹, Gao Benfeng¹, Tian Xincheng², Cui Haojiang¹

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Abstract

With the continuous increase in photovoltaic power generation, the photovoltaic concentrated grid-connected areas are prone to the problem of unbalanced three-phase voltage due to low local load and weak support ability, which has an impact on the stable operation of the power grid. In response to the above problems, this article firstly establishes a single-machine fundamental frequency negative order-order analysis impedance, considering the influenees of PV array, current inner loop, phase locked loop, LC filter and current loop dq decoupling based on the theory of harmonic linearization, and then establish a single-machine equivalent value model of the photovoltaic power station. Then, based on the negative sequence model of photovoltaic power station, the equivalent circuit model of photovoltaic power field cluster gathering area is constructed to analyze the mechanism and influencing factors of voltage unbalance in the gathering system. Finauy, the photovoltaic collection system electromagnetic temporary simulation model is established through the PSCAD/EMTDC simulation platform. The influencing factors of the time domain simulation analysis are used to verify the correctness of the theoretical analysis results.

Key words

photovoltaic system / stability / voltage unbalance / negative order analysis model / influencing factors

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Zhang Jianpo, Chai Xinru, Gao Benfeng, Tian Xincheng, Cui Haojiang. ANALYSIS OF INFLUENCING FACTORS AND MECHANISM OF PHOTOVOLTAIC COLLECTION SYSTEM VOLTAGE IMBALANCE[J]. Acta Energiae Solaris Sinica. 2024, 45(12): 67-76 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1358

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