摘要
大规模新能源基地经柔直送出系统作为我国未来“沙戈荒”地区新能源开发的重要方案,其在单极闭锁故障时存在交流电压序贯波动的风险。针对新能源柔直送出系统单极闭锁故障期间稳控切机、新能源降功率以及泄能电阻退出等系列扰动引起的交流系统电压序贯波动问题,研究了机理与抑制策略。首先,介绍了大规模新能源基地经柔性直流送出系统的拓扑结构,建立了适用于系统交流电压序贯波动问题分析的数学模型。然后,阐述了单极闭锁故障、泄能电阻投退、新能源切机或降功率等扰动与交流电压的时序耦合机理。在此基础上,提出了新能源降功率与泄能电阻退出相协调的交流电压序贯波动抑制策略。最后,通过PSCAD/EMTDC仿真,验证所提理论与方法的有效性。
The large-scale renewable energy base transmitted by voltage source converter based direct current(VSC-HVDC),as an important scheme for renewable energy development in the desert and Gobi areas of Chinain the future,which has the risk of AC voltage sequential fluctuation in case of mono-polar blocking failure.This paper investigates the mechanism and suppression strategy of the AC voltage sequential fluctuation caused by a series of disturbances,such as renewable energy cutting or power reduction and energy-consuming resistor casting back during the mono-polar blocking process of renewable energy bases transmitted by VSC-HVDC.Firstly,the topology of large-scale renewable energy base transmitted by the VSC-HVDC system is introduced,and the mathematical model,which applies to the analysis of the system AC voltage sequential fluctuation problem,is established.Then,the generalized disturbances such as mono-polar blocking fault,energy-consuming resistor casting off,renewable energy cutting or power reduction,and the time-sequence coupling mechanism of AC voltage are elaborated.The AC voltage sequential fluctuation suppression strategy is proposed on this basis,coordinated with renewable energy power reduction and energy-consuming resistor withdrawals.Finally,the effectiveness of the proposed theory and method is verified by PSCAD/EMTDC simulation.
作者
刘文韬
黄莹
王国腾
徐政
LIU Wentao;HUANG Ying;WANG Guoteng;XU Zheng(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China)
出处
《电网技术》
北大核心
2025年第3期934-944,I0020-I0024,共16页
Power System Technology
关键词
新能源基地
柔性直流输电系统
单极闭锁
交流电压序贯波动
抑制策略
renewable energy base
voltage source converter based direct current(VSC-HVDC)
mono-polar blocking
AC voltage sequential fluctuation
suppression strategy
