Coupling Relationship Between Wind Power Grid-connected Power and DC Transmission Power with DC Block Fault

doi:10.11930/j.issn.1004-9649.202001069

Abstract

Abstract: China's primary energy production bases and load centers are inversely distributed and the renewable energy of the production base cluster is delivered through UHVDC cluster, so the coupling characteristics of wind power and DC are complex in the power grid with high renewable energy penetration. Firstly, an analytical model is established to study the coupling relationship between wind power and DC in power grid frequency and voltage. Secondly, according to the maximum frequency-deviation tolerance of power grid, the frequency coupling characteristics of wind power and DC are calculated. Thirdly, according to the constraint of the total trip-off of wind power transient overvoltage under DC blocking fault, the wind power transient voltage rise at the grid-connected point is derived, and the relationship between the transient voltage rise and the trip-off quantity is calculated. The coupling relationship of transient overvoltage between DC and wind power is thus obtained. Theoretic analysis shows that wind power is negatively associated with DC, and simulation of the relationship between the transmission capacity of the Qinhai-Henan DC project and the grid-connected power of adjacent wind power based on the data of the Northwest China Power Grid in 2020 verifies the correctness of the theoretical derivation.

Key words: grid-connected power of wind power, DC transmission capacity, coupling, transient overvoltage, normal distribution

QIE Zhaohui, LI Zhaowei, WANG Weizhou, LI Wei, KE Xianbo. Coupling Relationship Between Wind Power Grid-connected Power and DC Transmission Power with DC Block Fault[J]. Electric Power, 2021, 54(6): 175-182.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202001069

https://www.electricpower.com.cn/EN/Y2021/V54/I6/175

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