电机与控制应用2024，Vol.51Issue(4)：20-28,9.DOI:10.12177/emca.2024.006
基于主动电压抬升的光伏全直流汇集与送出系统网侧故障穿越策略
Fault Ride-Through Strategy for PV Full DC Collection and Transmission System Based on Active Voltage Rising Method
摘要
Abstract
In the photovoltaic(PV)full DC collection and transmission system,a short circuit fault on the high voltage DC(HVDC)side will lead to a decrease in power absorption capacity of the high voltage side DC grid.PVs cannot detect the fault of the high voltage side DC grid in time,therefore its output power remains unchanged,which results in the system overvoltage and causes the system to shut down.To address this problem,a fault ride through strategy based on the active voltage rise is proposed.While the voltage of the high voltage side submodule of the high voltage DC transformer is risen to a certain level,the number of the medium voltage side submodules which output the high voltage level is increased to rise the voltage of the medium DC bus.And with the maximum power point tracking(MPPT)converters which have the function of fault state P-V droop,the MPPTs enter the power limiting mode in advance to achieve the power balance of the high voltage DC transformer,thus reduces the overvoltage of the submodule capacitor,and achieves the fault ride through function.The overvoltage of the HVDC transformer submodule under the proposed strategy is analyzed,and the effectiveness and necessity of the strategy are verified by simulation.关键词
光伏全直流汇集与送出/高压直流变压器/最大功率点跟踪装置/过电压/P-V下垂/故障穿越Key words
PV full DC collection and transmission/high voltage DC transformer/maximum power point tracking converter/overvoltage/P-V drop/fault ride through分类
信息技术与安全科学引用本文复制引用
史兴华,张雪垠,甘纯,马已青,闻旭东,段金沛,赵彪..基于主动电压抬升的光伏全直流汇集与送出系统网侧故障穿越策略[J].电机与控制应用,2024,51(4):20-28,9.基金项目
国网浙江省电力有限公司项目(5211DS230005)Project supported by the State Grid Zhe-Jiang Electric Power Co.,Ltd.(5211DS230005) （5211DS230005）
