安全、健康和环境2025，Vol.25Issue(1)：16-23,8.DOI:10.3969/j.issn.1672-7932.2025.01.003
大规模分布式光伏接入石化企业对配电网安全影响研究
Research on the Influence of Large-scale Distributed Photovoltaic Access to Petrochemical Enterprises on Distribution Network Security
摘要
Abstract
The large-scale distributed photovoltaic access brings significant changes in power grid flow and power quality to petrochemical enterprises,which is an important factor affecting the safe and stable supply of e-lectricity for these enterprises.Based on a case study of a photovoltaic power station connected to an enterprise's distribution network,a safety impact analysis was conducted on voltage fluctuations,short-circuit currents,har-monics,low voltage ride through,and fault characteristics at the grid connection point before and after photovolta-ic grid connection.The results indicated that the closer the photovoltaic grid connection point was to the system head,i.e.at a higher voltage level,the smaller the system voltage fluctuation and harmonic distortion rate.Mo-reover,under a certain photovoltaic access capacity,there was a limit to the length of the photovoltaic transmis-sion line.On the same branch,the voltage fluctuations caused by being closer to the photovoltaic grid connection point were more pronounced,and had little effect on the voltage of adjacent branches.The short-circuit current of the photovoltaic grid connection point busbar was basically equal to the sum of the short-circuit currents provided by the grid side and the photovoltaic side.During the low voltage ride through phase,the reactive power output of the photovoltaic inverter increased,providing transient voltage support to the grid connection point.The support capacity was proportional to the capacity of the photovoltaic inverter.This example and conclusion can provide ref-erence and guidance for large-scale distributed photovoltaic access enterprise power grid planning and operation.关键词
分布式光伏/电压波动/谐波/短路电流/低电压穿越Key words
distributed photovoltaic/voltage fluctuation/harmonics/short-circuit current/low voltage crossing分类
安全科学引用本文复制引用
王美威,张洪阳,李君,陶丽楠,孙阳..大规模分布式光伏接入石化企业对配电网安全影响研究[J].安全、健康和环境,2025,25(1):16-23,8.基金项目
国家自然科学基金(52241702),可再生能源直流离网制氢系统电能传输变换与协同保护控制关键技术. （52241702）
