摘要
远方清洁能源经直流大容量远距离送入负荷中心是电网的发展趋势。加强交流网架等传统措施已不能满足多直流馈入受端电网安全稳定运行需求,迫切需要研究柔性输电新技术的应用可行性。首先分析了多直流馈入受端电网安全稳定运行面临的风险与挑战。结合柔性直流输电技术优势,针对潮流分布不均导致的交流断面输电能力受限问题,提出了支撑断面输电能力最大化的柔性直流布局方法,并量化了柔性直流并网后断面输电能力提升效果。针对交流故障诱发多回直流同时换相失败问题,提出了降低两回直流同时换相失败风险的柔性直流配置方法,并量化了诱发两回直流同时换相失败的交流系统故障区域降低效果。以河南电网实际数据为例验证了所提方法的有效性。在关键输电断面配置柔性直流可充分挖掘现有输电设备潜力、提升断面输电能力,显著缩小引起两回直流同时换相失败的交流故障区域范围,提升电网安全稳定运行水平。
Long-distance transmission of large-capacity clean energy to load center via DC is the development trend of power grid.Traditional measures for example strengthening the AC grid can no longer meet the requirements of safe and stable operation of multi-DC feeding receiving power grids.It is urgent to study the application feasibility of new flexible transmission technologies.This paper first analyzes the risks and challenges faced by the safe and stable operation of multi-DC feeding receiving power grids.Combined with the advantages of VSC-HVDC and aiming at the problem of limited transmission capacity of AC section caused by uneven power flow distribution,a VSC-HVDC layout method to maximize the transmission capacity is proposed and the effect of improving the transmission capacity of the VSC-HVDC grid-connected section is quantified.Aiming at the problem of multi DC simultaneous commutation failure caused by AC fault,a VSC-HVDC configuration method for reducing the risk of two DC simultaneous commutation failures is proposed and the reduction effect is quantified.The effectiveness of the proposed method is verified by taking the actual data of Henan Power Grid as an example.The configuration of VSC-HVDC in the key transmission section can fully exploit the potential of existing transmission equipment and improve the transmission capacity of the section,significantly reduce the range ofAC fault areas that cause the two DC commutation failures,and improve the safe and stable operation level of the grid.
作者
唐晓骏
张正卫
韩民晓
谢岩
赵娟
霍启迪
TANG Xiaojun;ZHANG Zhengwei;HAN Minxiao;XIE Yan;ZHAO Juan;HUO Qidi(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Grid Security and Energy Conservation (China Electric Power Research Institute Co.,Ltd.),Beijing 100192,China;State Grid Henan Electric Power Company,Zhengzhou 450008,China)
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2019年第10期57-64,共8页
Power System Protection and Control
基金
国家自然科学基金项目(51777196)
国家电网公司科技项目(XTB11201703025)~~
关键词
多直流馈入
断面输电能力
换相失败
柔性直流配置方法
multi-infeed HVDC
section transmission capacity
commutation failure
VSC-HVDC configuration method
