考虑电网支撑能力约束的直流落点及定容优化规划

doi:10.11930/j.issn.1004-9649.202303052

摘要/Abstract

摘要： 特高压直流输电具备超远距离、大容量送电能力，有效缓解了中国负荷需求与清洁能源分布不匹配的问题。但随着直流馈入数量和容量的持续增加，受端电网支撑能力显著下降，安全稳定运行风险骤升。为此，提出了一种考虑电网支撑能力约束的受端电网直流落点及定容优化规划方法。首先，计及受端电网电压和频率支撑能力，构建包括直流落点、接入方式选择和近区网架优化在内的直流落点协调规划模型，将直流落点规划问题转化为数学优化问题。进而，将模型分解为上层规划层和下层运行校验层，基于Benders分解算法实现该复杂优化模型的迭代求解。最后，针对改进的IEEE-39节点系统和某省级电网开展了算例分析。由计算和仿真结果可知，所提模型确定的直流落点规划方案相较对比方案，能够在一定程度上提高受端电网应对交直流故障的电压和频率稳定性。

关键词: 特高压直流, 落点, 接入方式, 近区网架, 电压, 频率

Abstract: Ultra-high voltage direct current (UHVDC) transmission has the high capacity to transmit power over a long distance, which has effectively alleviated the problem of mismatch between the load's demand and the clean energy distribution in China. However, with the increasing number and capacity of UHVDC infeed in the receiving-end power grid, the supporting capacity of the receiving-end power grid decreases significantly, and the safety and stability risks of the power grid rise sharply. Therefore, this paper puts forward a optimal planning method for terminal locations and capacities of UHVDC considering the constraints of the grid support capacity. Firstly, considering the voltage and frequency support capability of the receiving-end power grid, a coordinated planning model of UHVDC terminal locations (including the DC terminal locations, access mode selection and near-region grid optimization) is constructed, which transforms the DC terminal location planning problem into a mathematical optimization problem. Furthermore, the model is decomposed into a upper layer for planning and a lower layer for operation checking, and the the Benders decomposition algorithm is used to realized the iterative solution of the complex optimization model. Finally, a case study is made on an improved IEEE-39 node system and a provincial power grid. The results of calculation and simulation show that compared with the comparison schemes, the planning scheme for DC terminal locations determined by the proposed model can improve the voltage and frequency stability against the AC and DC faults of the receiving-end power grid to a certain extent.

Key words: UHVDC, terminal locations, access mode, near-area grid, voltage, frequency

于琳琳, 严格, 晏昕童, 毛玉宾, 陈姝彧, 李甜甜, 文云峰. 考虑电网支撑能力约束的直流落点及定容优化规划[J]. 中国电力, 2023, 56(8): 175-185.

YU Linlin, YAN Ge, YAN Xintong, MAO Yubin, CHEN Shuyu, LI Tiantian, WEN Yunfeng. Optimal Planning of Terminal Locations and Capacity of UHVDC Considering Constraints of Receiving-End Power Grid Support Capability[J]. Electric Power, 2023, 56(8): 175-185.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.202303052

https://www.electricpower.com.cn/CN/Y2023/V56/I8/175

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