计及光伏发电低电压穿越不确定性的主动配电网短路电流概率评估

doi:10.19595/j.cnki.1000-6753.tces.190049

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摘要光伏发电注入电网的短路电流由故障时并网点电压跌落和机组低电压穿越共同决定,而电网故障时光伏低电压穿越能力具有不确定性。该文分析光伏发电并网运行时,在不同端电压跌落下呈现的故障特性;考虑光伏低电压穿越能力的不确定性,用正态分布概率密度函数表征光伏发电脱网的随机特性,建立光伏发电低电压脱网的随机评估模型;进一步结合系统故障信息,基于蒙特卡洛模拟提出计及低电压穿越不确定性的主动配电网短路电流概率评估方法,通过光伏发电短路电流特性、低电压脱网评估模型与故障条件来确定系统短路电流概率分布。最后,通过13节点和50节点配电网算例对该文方法进行验证,该方法综合考虑配电网故障发生和光伏发电低电压脱网的随机因素,所得短路电流结果能准确反映系统的实际短路电流水平。

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	李宇泽
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关键词 ：光伏发电, 低电压穿越, 主动配电网, 短路电流, 概率评估

Abstract：The short-circuit current of photovoltaic power generations is determined by the sag of grid-connected voltage and low voltage ride-through during the fault, however both voltage and low voltage ride-through are uncertain. Short-circuit current characteristics of photovoltaic power generations, under different terminal voltage sags, is analyzed. Considering uncertainty of low voltage ride-through ability, the normal distribution probability density function is used to characterize the random characteristics of photovoltaic power generation, then a stochastic evaluation model of low-voltage off-grid is established. Moreover, based on Monte Carlo method, a probabilistic evaluation method of short-circuit currents in active distribution grids, considering low voltage ride-through uncertainty, is proposed. The probability distribution of short-circuit current in the system is determined by short-circuit current characteristics of photovoltaic generations, low-voltage off-grid model and fault conditions. Finally, the method is verified by calculation examples with 13-node and 50-node respectively. In addition, the proposed method comprehensively considers random factors of faults occurrence and low-voltage off-grid, therefore the obtained results can accurately reflect the actual short-circuit current level in power system.

Key words： Photovoltaic low voltage ride-through active distribution grid short-circuit current probabilistic evaluation

收稿日期: 2019-01-16 出版日期: 2020-02-12

PACS:

TM713

基金资助:国家自然科学基金（51577018）和重庆市基础与前沿研究计划（cstc2016jcyjA0402）资助项目

通讯作者: 周念成男,1969年生,博士,教授,研究方向为电力系统自动化和电能质量。E-mail：cee_nczhou@cqu.edu.cn

作者简介: 李宇泽男,1998年生,本科,研究方向为电力系统自动化和电能质量。E-mail：2711581249@qq.com

引用本文:

李宇泽, 周念成, 侯健生, 吴佳芳, 龚丽. 计及光伏发电低电压穿越不确定性的主动配电网短路电流概率评估[J]. 电工技术学报, 2020, 35(3): 564-576. Li Yuze, Zhou Niancheng, Hou Jiansheng, Wu Jiafang, Gong Li. Probabilistic Evaluation of Short-Circuit Currents in Active Distribution Grids Considering Low Voltage Ride-Through Uncertainty of Photovoltaic. Transactions of China Electrotechnical Society, 2020, 35(3): 564-576.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.190049 https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I3/564

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