计及送端电网频率稳定的直流联络线极限承载能力评估  

Total transfer capability assessment of HVDC tie-lines based on frequency stability of the sending-end grid

作　　者：肖友强 邓步青 文云峰 XIAO Youqiang;DENG Buqing;WEN Yunfeng(Research Center of Power Grid Planning and Construction of Yunnan Power Grid Co., Ltd.,Kunming 650011, China;College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)

机构地区：[1]云南电网有限责任公司电网规划建设研究中心,云南昆明650011 [2]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电力科学与技术学报》2021年第2期3-12,共10页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51707017);云南电网有限责任公司科技项目(0500002019030201GHJ00041)。

摘　　要：异步互联电网的发展为清洁能源跨区消纳和资源优化配置提供了有利条件,而与之带来的频率稳定问题也日益凸显,成为送端电网安全运行的一大挑战。为此,提出一种计及送端电网频率稳定的直流联络线极限承载能力评估模型。模型中构建大容量直流闭锁下的送端电网惯性、备用与频率稳定相关约束,并计及事故后一次调频与直流紧急功率支援、稳控切机的协调配合,通过优化计算确定正常状态下直流联络线在未来多个运行时段的最大传输能力。最后,在改进的RTS-79系统上进行算例仿真分析,测试结果验证所提评估模型有效正确。The interconnection between asynchronous power systems can promote the consumption of clean energy and the optimization of resources by high voltage direct current(HVDC)transmission systems.However,the frequency stability problem becomes a potential threat to power systems,which can be considered as a major challenge of the sending power grid.A novel total transfer capability assessment model(FTTC)of HVDCs is proposed by taking into account the frequency stability of sending-end grid.Considering the inertia/reserve requirements and frequency stability constraints of the sending-end grid,the model can produce maximum acceptable TTC of HVDC tie-lines.Moreover,a optimization model of the HVDC tie-line operation is developed by considering the coordination of the HVDC corrective control and the generation trigger after contingency.Finally,a case study of the modified RTS-79 system is used to verify the effectiveness of the proposed method.

关 键 词：异步电网 极限承载能力 频率稳定 直流联络线 直流调制 低惯性 

分 类 号：TM711[电气工程—电力系统及自动化]