Optimal Planning of Terminal Locations and Capacity of UHVDC Considering Constraints of Receiving-End Power Grid Support Capability

doi:10.11930/j.issn.1004-9649.202303052

Abstract

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

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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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202303052

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

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