电力系统自动化2026，Vol.50Issue(12)：192-200,9.DOI:10.7500/AEPS20250503003
大规模光伏外送系统光伏逆变器直流侧电压跌落抑制策略
Mitigation Strategy for DC-side Voltage Sag of Photovoltaic Inverters in Large-scale Photovoltaic Power Transmission System
摘要
Abstract
In the large-scale photovoltaic(PV)power transmission system,the control response of PV inverters after the clearance of AC system faults may lead to DC-side voltage sags,representing a new type of power quality issue induced by control response.To address this issue,this paper first investigates the internal power characteristics of PV generation units and the impact of inverter control states on the DC-side voltage.Based on the mechanistic analysis,the evolution process of the DC-side voltage sag is analyzed.Aiming to prevent the operational state evolution during this process,a fault detection method based on DC-side voltage and a mitigation strategy for the DC-side voltage sag based on active power output limitation are proposed.After detecting a fault,the constant active current control is used to limit the active power output of the inverter,thereby achieving the effect of mitigating the DC-side voltage sag.Finally,the optimal parameters of the mitigation strategy are obtained based on PSCAD/EMTDC simulation,and the effectiveness of the proposed mitigation strategy is verified by comparing the fault simulation of the system before and after the application of the strategy.关键词
新型电力系统/电能质量/控制响应/光伏逆变器/电压跌落/故障检测/抑制策略Key words
new power system/power quality/control response/photovoltaic inverter/voltage sag/fault detection/mitigation strategy引用本文复制引用
李天宇,钟庆,冯俊杰,沈枢昊,李海锋,王钢..大规模光伏外送系统光伏逆变器直流侧电压跌落抑制策略[J].电力系统自动化,2026,50(12):192-200,9.基金项目
国家自然科学基金资助项目(52077082) （52077082）
中国南方电网有限责任公司科技项目(YNKJXM20222288). This work is supported by National Natural Science Foundation of China(No.52077082)and China Southern Power Grid Company Limited(No.YNKJXM20222288). （YNKJXM20222288）
