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电力大数据:2019,22(11):-
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交直流混合状态估计实用技术研究与实践
施雄华1, 顾全1, 周华锋2, 宋兴旺3, 范磊1, 徐晓亮1
(1.南京南瑞继保电气有限公司;2.中国南方电网电力调度控制中心;3.天津市电力公司城西供电分公司)
Research and practice on practical technology of AC/DC hybrid state estimation
SHI Xionghua1, GU Quan1, ZHOU Huafeng2, SONG Xingwang3, FAN Lei1, XU Xiaoliang1
(1.NR Electric Co Ltd;2.Power Dispatching and Control Center,China Southern Power Grid Company;3.Tianjin Chengxi District Power Supply Company)
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投稿时间:2018-09-19    修订日期:2019-02-26
中文摘要: 为适应高压直流输电的广泛应用,调度中心状态估计软件迫切需要进行相应修改。同时,特高压直流双阀组换流极的出现,也对状态估计直流建模提出了新的要求。针对±800kV特高压直流输电,提出了一套适应换流极双阀组特点的直流输电量测模型,该模型能同时兼容单阀组运行方式。为确保状态估计功能的平稳过渡,采用交替迭代方法,通过对现有成熟的状态估计软件进行较小修改,实现了交直流混合状态估计。指出工程实际应用中的若干技术问题,包括:软件总体流程的设计、换流损耗的考虑、直流运行方式的修正以及特殊量测的转换,并提出了相应的解决措施。开发的交直流混合状态估计软件已在南网总调投入正式运行,实际应用表明其精度、效率以及收敛性均满足实际工程现场要求。
Abstract:In order to adapt to the wide application of HVDC transmission, the state estimation software of dispatching center urgently needs to be modified accordingly. At the same time, the emergence of UHVDC double valve group converter Pole also puts forward new requirements for DC modeling of state estimation. Aiming at the ±800kV UHVDC transmission, a DC transmission measurement model is proposed to meet the characteristics of the converter pole that contains double valve group. The model can also be compatible with single valve group operation mode. In order to ensure the smooth transition of the state estimation function, the alternating iterative method is used to realize the AC/DC hybrid state estimation by making minor modifications to the existing mature state estimation software. Some technical problems in the practical application of engineering are pointed out, including the design of the overall software flow, the consideration of converter loss, the correction of DC operation mode and the conversion of special measurement, and the corresponding solutions are proposed. The developed AC/DC hybrid state estimation software has been put into operation in the dispatching center of China Southern Power Grid. The practical application shows that its accuracy, efficiency and convergence meet the requirements of the actual project site.
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