ANALYSIS OF INFLUENCING FACTORS AND MECHANISM OF PHOTOVOLTAIC COLLECTION SYSTEM VOLTAGE IMBALANCE
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.
photovoltaic systemstabilityvoltage unbalancenegative order analysis modelinfluencing factors
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