文章摘要
应对UHVDC送端电网新能源大规模脱网的频率紧急控制
Emergency frequency control for large-scale disconnection of renewable energy in the UHVDC sending grid
投稿时间:2019-12-16  修订日期:2020-03-20
DOI:
中文关键词: 新能源脱网  特高压直流  低电压穿越  紧急控制
英文关键词: renewable energy off-grid  ultra-high voltage direct current  low voltage ride through  emergency control
基金项目:国家重点研发计划
作者单位E-mail
霍超 国家电网公司西北分部 victorlee_nari@126.com 
李兆伟 国电南瑞科技股份有限公司 lizhaowei1@sgepri.sgcc.com.cn 
柯贤波 国家电网公司西北分部  
郄朝辉 南瑞集团  
王超 国电南瑞科技股份有限公司  
屠竞哲 中国电力科学研究院有限公司  
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中文摘要:
      随着特高压直流的推广应用及新能源发电占比的不断提高,有力支撑了国家的能源转型战略。但由于新能源机组的涉网保护性能较差,在新能源集中接入的直流送端电网,发生交直流故障后容易导致新能源大规模脱网,给电网的暂态频率安全保障技术带来极大挑战。论文首先分析了特高压直流送端电网新能源大规模脱网的故障过程,分析了现有应对新能源脱网措施的不足,根据故障过程特征设计利用直流换相失败等信息作为触发条件的频率紧急控制技术方案,提出了频率紧急控制的实现方法,结合西北电网开展了仿真验证,对新能源低电压穿越的影响进行了深入分析,验证了所提技术方案和策略的有效性。
英文摘要:
      With the promotion and application of UHVDC and the continuous increase of the proportion of renewable energy power generation, it has strongly supported the country"s energy transformation strategy. However, due to the poor network-related protection performance of renewable energy units, in the DC sending power grid where renewable energy is centrally connected, AC and DC faults can easily cause large-scale disconnection of renewable energy, which brings to a great challenge for the grid"s transient frequency security technology. In this paper the failure process of large-scale disconnection of renewable energy from the UHVDC receiving grid is first analyzed. Then the existing measures to deal with the disconnection of renewable energy are discussed. Finally the emergency control technical scheme using the information of DC commutation failure is designed according to the characteristics of the fault process. The simulation in conjunction with the Northwest Power Grid is carried out, conducting an in-depth analysis of the impact of new energy low voltage ride-through, and the effectiveness of the proposed technical scheme and strategy is verified.
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