含分布式电源的配电网电压越限薄弱环节识别方法
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摘要
提出一种含分布式电源(DG)的配电网电压越限薄弱环节的识别方法。对电压越限原因进行机理分析,确定导致电压越限可能的原因及其电压敏感度;定义压降比系数,提出计及网损的各节点DG/负荷最大准入容量的计算方法;研究将各节点实际接入DG容量归算至馈线末端的方法,并将其与馈线末端的最大准入容量进行比较,识别配电网中易发生电压越限的薄弱节点及越限原因;在MATLAB上搭建IEEE 33节点系统验证所提方法的有效性和正确性。
An identification method of voltage over-limit weak link in distribution network with DGs(Distributed Generations) is proposed. The mechanism of voltage over-limit is analyzed,and the possible causes of voltage over-limit and their voltage sensitivities are determined. The voltage drop ratio coefficient is defined,and the calculation method for the maximum penetration level of DG/load of each node is proposed considering the network loss. The reduction method of calculating the actual DG capacity of each node to the feeder terminal is studied,whose results are compared with the maximum penetration level of the end of the feeder to identify the vulnerable nodes whose voltages are easily out-of-limit and corresponding reasons. IEEE 33-bus system is built on MATLAB to verify the validity and correctness of the proposed method.
An identification method of voltage over-limit weak link in distribution network with DGs(Distributed Generations) is proposed. The mechanism of voltage over-limit is analyzed,and the possible causes of voltage over-limit and their voltage sensitivities are determined. The voltage drop ratio coefficient is defined,and the calculation method for the maximum penetration level of DG/load of each node is proposed considering the network loss. The reduction method of calculating the actual DG capacity of each node to the feeder terminal is studied,whose results are compared with the maximum penetration level of the end of the feeder to identify the vulnerable nodes whose voltages are easily out-of-limit and corresponding reasons. IEEE 33-bus system is built on MATLAB to verify the validity and correctness of the proposed method.
引文
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[9] 李鹏,廉超,李波涛. 分布式电源并网优化配置的图解方法[J]. 中国电机工程学报,2009,29(4):91-96.LI Peng,LIAN Chao,LI Botao. A graph-based optimal solution for siting and sizing of grid-connected distribution generation[J]. Proceedings of the CSEE,2009,29(4):91-96.
[10] 张沈习,李珂,程浩忠,等. 间歇性分布式电源在主动配电网中的优化配置[J]. 电力自动化设备,2015,35(11):45-51.ZHANG Shenxi,LI Ke,CHENG Haozhong,et al. Optimal allocation of intermittent distribution generator in active distribution network[J]. Electric Power Automation Equipment,2015,35(11):45-51.
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[12] 邹宏亮,韩翔宇,廖清芬,等. 考虑电压质量与短路容量约束的分布式电源准入容量分析[J]. 电网技术,2016,40(8):2273-2280.ZOU Hongliang,HAN Xiangyu,LIAO Qingfen,et al. Penetration capa-city calculation for distribution generation considering voltage qua-lity and short circuit capacity constraints[J]. Power System Technology,2016,40(8):2273-2280.
[13] 刘威,张东霞,丁玉成,等. 基于随机矩阵理论与熵理论的电网薄弱环节辨识方法[J]. 中国电机工程学报,2017,37(20):5893-5901.LIU Wei,ZHANG Dongxia,DING Yucheng,et al. Power grid vulnerability identification methods based on random matrix theory and entropy theory[J]. Proceedings of the CSEE,2017,37(20):5893-5901.
[14] 王璟,蒋小亮,杨卓,等. 光伏集中并网电压约束下的准入容量与电压波动的评估方法[J]. 电网技术,2015,39(9):2450-2457. WANG Jing,JIANG Xiaoliang,YANG Zhuo,et al. Penetration capacity under voltage constraint and evaluation methodology of voltage fluctuation caused by centralized grid connection of photovoltaic power[J]. Power System Technology,2015,39(9):2450-2457.
[15] 栗赛男,马建伟,孙芊,等. 考虑不确定出力的微网内分布式发电和储能的容量配置[J]. 电工电能新技术,2016,35(8):21-28.LI Sainan,MA Jianwei,SUN Qian,et al. Configuration optimization of capacity of distributed generation and energy storage in microgrid considering uncertain output[J]. Advanced Technology of Electrical Engineering and Energy,2016,35(8):21-28.
[16] 张忠,王建学,刘世民. 计及网络拓扑下微电网有功调节对电压控制的适应性分析[J]. 电力自动化设备,2017,37(4):22-29.ZHANG Zhong,WANG Jianxue,LIU Shimin. Adaptability of active-power adjustment to voltage control considering network topology of microgrid[J]. Electric Power Automation Equipment,2017,37(4):22-29.
[17] 金辉. 含分布式电源的配电网无功优化研究[D]. 北京:北京交通大学,2016.JIN Hui. Research on reactive power optimization of distribution network with distributed generation[D]. Beijing:Beijing Jiaotong University,2016.
[18] 颜伟,雷超,文旭,等. 无功优化不可行问题的薄弱节点辨识方法[J]. 中国电机工程学报,2015,35(18):4616-4624.YAN Wei,LEI Chao,WEN Xu,et al. A recognizing method for weak buses for the infeasibility of reactive optimization problem[J]. Proceeding of the CSEE,2015,35(18):4616-4624.
[2] 董朝阳,赵俊华,文福拴,等. 从智能电网到能源互联网:基本概念与研究框架[J]. 电力系统自动化,2014,38(15):1-11.DONG Zhaoyang,ZHAO Junhua,WEN Fushuan,et al. From smart grid to energy internet:basic concept and research framework[J]. Automation of Electric Power Systems,2014,38(15):1-11.
[3] 韦钢,吴伟力,胡丹云,等. 分布式电源及其并网时对电网的影响[J]. 高电压技术,2007,33(1):36-40.WEI Gang,WU Weili,HU Danyun,et al. Distribution generation and effect of its parallel operation on power system[J]. High Voltage Engineering,2007,33(1):36-40.
[4] 牟晓明,李卫星. 基于节点电压强弱性辨识的风电接纳能力评估[J]. 电力自动化设备,2015,35(9):130-135.MOU Xiaoming,LI Weixing. Wind power accommodation capability evaluation based on bus voltage strength index identification[J]. Electric Power Automation Equipment,2015,35(9):130-135.
[5] TONKOSKI R,LOPES L A C,EL-FOULY T H M. Coordinated active power curtailment of grid connected PV inverters for overvoltage prevention[J]. IEEE Transactions on Sustainable Energy,2011,2(2):139-147.
[6] 许晓艳,黄越辉,刘纯,等. 分布式光伏发电对配电网电压的影响及电压越限的解决方案[J]. 电网技术,2010,34(10):140-146.XU Xiaoyan,HUANG Yuehui,LIU Chun,et al. Influence of distribution photovoltaic generation on voltage in distribution network and solution of voltage beyond limits[J]. Power System Technology,2010,34(10):140-146.
[7] 李斌,刘天琪,李兴源. 分布式电源接入对系统电压稳定性的影响[J]. 电网技术,2009,33(3):84-88.LI Bin,LIU Tianqi,LI Xingyuan. Impact of distributed generation on power system voltage stability[J]. Power System Technology,2009,33(3):84-88.
[8] 文升,顾洁,程浩忠,等. 分布式电源的准入容量与优化布置的实用方法[J]. 电力自动化设备,2012,32(10):109-114.WEN Sheng,GU Jie,CHENG Haozhong,et al. Maximum penetra-tion level and optimal placement of distribution generation[J]. Elec-tric Power Automation Equipment,2012,32(10):109-114.
[9] 李鹏,廉超,李波涛. 分布式电源并网优化配置的图解方法[J]. 中国电机工程学报,2009,29(4):91-96.LI Peng,LIAN Chao,LI Botao. A graph-based optimal solution for siting and sizing of grid-connected distribution generation[J]. Proceedings of the CSEE,2009,29(4):91-96.
[10] 张沈习,李珂,程浩忠,等. 间歇性分布式电源在主动配电网中的优化配置[J]. 电力自动化设备,2015,35(11):45-51.ZHANG Shenxi,LI Ke,CHENG Haozhong,et al. Optimal allocation of intermittent distribution generator in active distribution network[J]. Electric Power Automation Equipment,2015,35(11):45-51.
[11] 刘健,黄炜. 分布式光伏电源与负荷分布接近条件下的可接入容量分析[J]. 电网技术,2015,39(2):299-306.LIU Jian,HUANG Wei. Analysis on grid-connectable capacity of distribution PV generation in case of PV generation distribution close to load distribution[J]. Power System Technology,2015,39(2):299-306.
[12] 邹宏亮,韩翔宇,廖清芬,等. 考虑电压质量与短路容量约束的分布式电源准入容量分析[J]. 电网技术,2016,40(8):2273-2280.ZOU Hongliang,HAN Xiangyu,LIAO Qingfen,et al. Penetration capa-city calculation for distribution generation considering voltage qua-lity and short circuit capacity constraints[J]. Power System Technology,2016,40(8):2273-2280.
[13] 刘威,张东霞,丁玉成,等. 基于随机矩阵理论与熵理论的电网薄弱环节辨识方法[J]. 中国电机工程学报,2017,37(20):5893-5901.LIU Wei,ZHANG Dongxia,DING Yucheng,et al. Power grid vulnerability identification methods based on random matrix theory and entropy theory[J]. Proceedings of the CSEE,2017,37(20):5893-5901.
[14] 王璟,蒋小亮,杨卓,等. 光伏集中并网电压约束下的准入容量与电压波动的评估方法[J]. 电网技术,2015,39(9):2450-2457. WANG Jing,JIANG Xiaoliang,YANG Zhuo,et al. Penetration capacity under voltage constraint and evaluation methodology of voltage fluctuation caused by centralized grid connection of photovoltaic power[J]. Power System Technology,2015,39(9):2450-2457.
[15] 栗赛男,马建伟,孙芊,等. 考虑不确定出力的微网内分布式发电和储能的容量配置[J]. 电工电能新技术,2016,35(8):21-28.LI Sainan,MA Jianwei,SUN Qian,et al. Configuration optimization of capacity of distributed generation and energy storage in microgrid considering uncertain output[J]. Advanced Technology of Electrical Engineering and Energy,2016,35(8):21-28.
[16] 张忠,王建学,刘世民. 计及网络拓扑下微电网有功调节对电压控制的适应性分析[J]. 电力自动化设备,2017,37(4):22-29.ZHANG Zhong,WANG Jianxue,LIU Shimin. Adaptability of active-power adjustment to voltage control considering network topology of microgrid[J]. Electric Power Automation Equipment,2017,37(4):22-29.
[17] 金辉. 含分布式电源的配电网无功优化研究[D]. 北京:北京交通大学,2016.JIN Hui. Research on reactive power optimization of distribution network with distributed generation[D]. Beijing:Beijing Jiaotong University,2016.
[18] 颜伟,雷超,文旭,等. 无功优化不可行问题的薄弱节点辨识方法[J]. 中国电机工程学报,2015,35(18):4616-4624.YAN Wei,LEI Chao,WEN Xu,et al. A recognizing method for weak buses for the infeasibility of reactive optimization problem[J]. Proceeding of the CSEE,2015,35(18):4616-4624.
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