考虑分布式电源灵活接入下的配电网风险评估
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摘要
随着大量分布电源接入配电网,其出力的随机性和波动性给配电网稳定运行带来不可避免的影响。基于风电、光伏等分布式电源出力的概率分布模型和半不变量法概率潮流算法,考虑分布式电源间出力的相关性,进行分布式电源灵活接入下的配电网节点电压和线路潮流分布特性分析,并提出系统综合越限风险指标,实现了配电网运行风险评估。应用IEEE 34节点系统,考虑风电、光伏2种分布式电源的接入位置、容量和安装比例等灵活性,验证了所提方法的有效性。
With the development of new energy power technology,a large number of distributed generations(DG) are connected to the distribution network,and the randomness and volatility of their power output have an inevitable impact on the stability of the distribution network.In this paper,the system comprehensive over-limit risk index was proposed.The distribution network risk assessment is achieved based on the probabilistic model of DG and the semi-invariant probabilistic power flow calculation method.The correlation of different DG power output is considered.The probability distribution characteristics of distribution network bus voltage and line power flow under the flexible access of DG is analyzed.The effectiveness of the proposed method is verified by the simulation result of IEEE34-bus system considering the flexibility of the access location,capacity and installation ratio of the DG.
With the development of new energy power technology,a large number of distributed generations(DG) are connected to the distribution network,and the randomness and volatility of their power output have an inevitable impact on the stability of the distribution network.In this paper,the system comprehensive over-limit risk index was proposed.The distribution network risk assessment is achieved based on the probabilistic model of DG and the semi-invariant probabilistic power flow calculation method.The correlation of different DG power output is considered.The probability distribution characteristics of distribution network bus voltage and line power flow under the flexible access of DG is analyzed.The effectiveness of the proposed method is verified by the simulation result of IEEE34-bus system considering the flexibility of the access location,capacity and installation ratio of the DG.
引文
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[19]黄煜,徐青山,卞海红,等.基于拉丁超立方采样技术的半不变量法随机潮流计算[J].电力自动化设备,2016,36(11):112-119.HUANG Yu,XU Qingshan,BIAN Haihong,et al.Cumulant method based on latin hypercube sampling for calculating probabilistic power flow[J].Electric Power Automation Equipment,2016,36(11):112-119.
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[2]朱永强,齐琳,叶青,等.分布式电源并网电能质量问题综述[J].供用电,2014,31(2):31-34.
[3]赵贺,李明忆,井天军,等.光伏分布式发电接入方式分析及其对配电网运行的影响[J].供用电,2013,30(3):17-20.ZHAO He,LI Mingyi,JING Tianjun,et al.Analysis on integrate mode of photovoltaic dispersed generation into distribution network and influence on the operation[J].Distribution&Utilization,2013,30(3):17-20.
[4]高元海,王淳.基于全概率公式的含风电配电系统概率潮流计算[J].中国电机工程学报,2015,35(2):327-334.GAO Yuanhai,WANG Chun.Probabilistic load flow calculation of distribution system including wind farms based on total probability formula[J].Proceedings of the CSEE,2015,35(2):327-334.
[5]叶学顺,刘科研,孟晓丽.含分布式电源的交直流混合配电网潮流计算[J].供用电,2016,33(8):23-26,49.YE Xueshun,LIU Keyan,MENG Xiaoli,et al.Power flow calculation of AC/DC hybrid distribution network with distributed generations[J].Distribution&Utilization,2016,33(8):23-26,49.
[6]吴巍,汪可友,李国杰,等.计及光伏发电相关性的多重积分法概率潮流计算[J].中国电机工程学报,2015,35(3):568-575.WU Wei,WANG Keyou,LI Guojie,et al.Probabilistic load flow calculation method based on multiple integral method considering correlation of photovoltaic generation[J].Proceedings of the CSEE,2015,35(3):568-575.
[7]PRUSTY B R,JENA D.Combined cumulant and Gaussian mixture approximation for correlated probabilistic load flow studies:a new approach[J].CSEE Journal of Power and Energy Systems,2016,2(2):71-78.
[8]AIEN M,FOTUHI-FIRUZABAD M,AMINIFAR F.Probabilistic load flow in correlated uncertain environment using unscented transformation[J].IEEE Transactions on Power Systems,2012,27(4):2233-2241.
[9]WIDEN J,SHEPERO M,MUNKHAMMAR J.Probabilistic load flow for power grids with high pv penetrations using copula-based modeling of spatially correlated solar irradiance[J].IEEE Journal of Photovoltaics,2017,7(6):1740-1745.
[10]芦晶晶,杜松怀,韦永忠,等.基于三点估计法的新能源电网快速风险评估[J].高电压技术,2017,43(1):172-180.LU Jingjing,DU Songhuai,WEI Yongzhong,et al.Three point estimation method for rapid risk evaluation of transmission system with new energy[J].High Voltage Engineering,2017,43(1):172-180.
[11]蒋程,刘文霞,张建华,等.含风电接入的发输电系统风险评估[J].电工技术学报,2014,29(2):260-270.JIANG Cheng,LIU Wenxia,ZHANG Jianhua,et al.Risk assessment of generation and transmission systems considering wind power penetration[J].Transactions of China Electrotechnical Society,2014,29(2):260-270.
[12]陈麒宇,LITTLER T,韩树山,等.风电机组脱网的风险评估[J].中国电机工程学报,2015,35(3):576-582.CHEN Qiyu,LITTLER T,HAN Shushan,et al.Risk assessment model for wind generator tripping off[J].Proceedings of the CSEE,2015,35(3):576-582.
[13]DE JONG M,PAPAEFTHYMIOU G,PALENSKY P.A framework for incorporation of infeed uncertainty in power system risk-based security assessment[J].IEEETransactions on Power Systems,2018,33(1):613-621.
[14]PRUSTY B R,JENA D.An over-limit risk assessment of PV integrated power system using probabilistic load flow based on multi-time instant uncertainty modeling[J].Renewable Energy,2018(116):367-383.
[15]陈伟,郭秋池,裴喜平.基于2n+1点估计法的含分布式电源配电网的电压质量概率评估[J].电网与清洁能源,2016,32(7):23-29.CHEN Wei,GUO Qiuchi,PEI Xiping.Probabilistic evaluation of voltage quality on 2n+1 point estimate method for the distribution system containing distributed generation[J].Power System and Clean Energy,2016,32(7):23-29.
[16]吴雅琪.含分布式电源的配电网风险评估研究[D].北京:北京交通大学,2017.
[17]石东源,蔡德福,陈金富,等.计及输入变量相关性的半不变量法概率潮流计算[J].中国电机工程学报,2012,32(28):104-113,12.SHI Dongyuan,CAI Defu,CHEN Jinfu,et al.Probabilistic load flow calculation based on cumulant method considering correlation between input variables[J].Proceedings of the CSEE,2012,32(28):104-113,12.
[18]张家安,李轩,高艳红,等.基于风力相关性的区域电网风电分布式接入容量优化配置[J].供用电,2016,33(4):23-27,22.ZHANG Jiaan,LI Xuan,GAO Yanhong,et al.Optimization of distributed wind power capacity allocation base on wind correlation for local grid[J].Distribution&Utilization,2016,33(4):23-27,22.
[19]黄煜,徐青山,卞海红,等.基于拉丁超立方采样技术的半不变量法随机潮流计算[J].电力自动化设备,2016,36(11):112-119.HUANG Yu,XU Qingshan,BIAN Haihong,et al.Cumulant method based on latin hypercube sampling for calculating probabilistic power flow[J].Electric Power Automation Equipment,2016,36(11):112-119.
[20]高立志.考虑风电场间歇性的电力系统风险评估[D].北京:北京交通大学,2012.