大规模光伏发电并网概率潮流计算及对电网的影响
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国家自然科学基金项目(5157070585);国家重点研发计划智能电网技术与装备专项项目(2016YFB0900400,2016YFB0900403)


Probabilistic Load Flow Calculation and Influence Analysis for Power Grid Connected with Large Scale Photovoltaic Generation System
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    摘要:

    随着并网光伏发电容量的规模越来越大,光伏发电固有的波动性和不可控性导致其大规模并网时会使潮流分布发生变化甚至潮流反向,对电网的安全稳定运行造成影响。建立了光伏发电系统的潮流计算模型,以IEEE 14节点系统和西北某省级电网系统为研究算例,对含光伏的电力系统进行概率潮流计算,全面分析了不同光伏接入容量、不同光伏接入点及不同光伏出力相关性的情况下大规模光伏并网对系统潮流的影响。结果表明光伏接入容量越大,电压及支路潮流的波动和越限概率也越大,光伏接入点将影响系统网损及光伏极限接入容量,并发现光伏接入对系统潮流的影响具有方向性,且光伏电站出力相关性不可忽略。所得结论可为电力系统新能源规划与运行提供决策参考。

    Abstract:

    With the increase of grid-connected photovoltaic generation capacity,the inherent characteristics of fluctuation and intermittence of the photovoltaic generation lead to the result that large-scale PV integration will change the distribution of power flow and even reverse it,influencing the stability and security of power grid.A steady-state model of PV generation system is established in the paper.Based on the IEEE 14-bus system and power grid of a province in Northwest China,probabilistic load flow calculation of power grid connected with photovoltaic generation system has been carried out.The influence of large scale grid-connected PV generation on load flow of power system is fully analyzed under the circumstances of different grid-connected capacity,different grid-connected spots and different output correlations of the PV generation system.The results indicate that the fluctuations and limit violation probabilities of power system voltage and load flow increase with the addition of PV capacity.What's more,power loss as well as PV penetration level is influenced by grid-connected spots and the impact of PV on load flow is directional.Additionally,the correlations among PV power stations cannot be ignored.The research does provide reference for the planning and operation of power system with large integration of renewable energy.

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引用本文

金楚,黎嘉明,徐沈智,文劲宇.大规模光伏发电并网概率潮流计算及对电网的影响[J].电力工程技术,2017,36(1):1-8

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  • 收稿日期:2016-10-25
  • 最后修改日期:2016-11-22
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  • 在线发布日期: 2017-01-05
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