光伏汇集系统电压不平衡影响因素及机理分析  

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

作　　者：张建坡 柴欣茹 高本锋 田新成 崔浩江 Zhang Jianpo;Chai Xinru;Gao Benfeng;Tian Xincheng;Cui Haojiang(Hebei Key Laboratory of Distributed Energy Storage and Micro-grid(North China Electric Power University),Baoding 071003,China;State Grid Hebei Tangshan Power Supply Company,Tangshan 063000,China)

机构地区：[1]河北省分布式储能与微网重点实验室(华北电力大学),保定071003 [2]国网冀北电力有限公司唐山供电公司,唐山063000

出　　处：《太阳能学报》2024年第12期67-76,共10页Acta Energiae Solaris Sinica

基　　金：国家重点研发计划(2021YFB2400800)。

摘　　要：伴随光伏发电规模不断增加,光伏集中并网地区由于本地负荷少,无功支撑能力弱,易出现三相电压不平衡问题,将对电网稳定运行产生影响。针对上述问题,首先基于谐波线性化理论,考虑光伏阵列、电流内环、锁相环、LC滤波器及电流环dq解耦环节影响,推导光伏并网系统单机基频负序解析阻抗,进而建立光伏电站单机等值模型;然后以光伏电站负序模型为基础,构建光伏电场集群汇集地区等效电路模型,分析汇集系统电压不平衡产生机理及其影响因素;最后,利用PSCAD/EMTDC仿真平台建立光伏汇集系统电磁暂态仿真模型,通过时域仿真验证理论分析结果正确性。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.

关 键 词：光伏系统 稳定性 电压不平衡 负序解析模型 影响因素 

分 类 号：TM712[电气工程—电力系统及自动化]