实现可靠自动转供的城市配电网改造规划
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摘要
分析了目前中压配电网环网线路转供率不高的成因,提出了在中区内通过支路联络开关优化部分负荷的接入点、降低主干馈线负载率,以最小的改造代价即可满足转供安全校验条件的规划策略。以此构建了基于Distflow潮流的辐射状配电网馈线负荷均衡优化模型,满足馈线对"N-1"负荷校验约束及网络拓扑约束。通过二阶锥松弛技术对该混合整数非凸非线性规划进行凸松弛,使原问题转化为可高效求解的混合整数二阶锥问题进行求解。为验证该模型的可行性与有效性,采用68节点和34节点配电系统对该模型进行了仿真测试,表明仅通过重构的手段即可使馈线满足联络开关自动转供的要求,并在一定程度上提高了配电网运行的经济性。
The causes of the low load transfer rate of the ring network in the medium voltage distribution network are analyzed.It is proposed to optimize the partial load access points by changing the state of branch contact switches and reduce the load factors of the main feeders in the mesh-networking.The planning strategy can satisfy the conditions for safety verification at the minimal transformation cost.A feeder load balancing optimization model for radial distribution network based on Distflow is proposed to meet the feeder constraint of"N-1"load and network topology constraints.The second-order cone relaxation technique is applied to convexly relax the mixed integer nonconvex nonlinear programming so that the former condition can be transformed into a mixed integer second-order cone problem that can be efficiently solved.In order to verify the feasibility and effectiveness of this model,the model is tested by 68-node and 34-node distribution networks.The results show that the feeder can satisfy the requirements of automatic supply transfer only by reconstruction,and to some extent,can improve the economics of the distribution network operation.
The causes of the low load transfer rate of the ring network in the medium voltage distribution network are analyzed.It is proposed to optimize the partial load access points by changing the state of branch contact switches and reduce the load factors of the main feeders in the mesh-networking.The planning strategy can satisfy the conditions for safety verification at the minimal transformation cost.A feeder load balancing optimization model for radial distribution network based on Distflow is proposed to meet the feeder constraint of"N-1"load and network topology constraints.The second-order cone relaxation technique is applied to convexly relax the mixed integer nonconvex nonlinear programming so that the former condition can be transformed into a mixed integer second-order cone problem that can be efficiently solved.In order to verify the feasibility and effectiveness of this model,the model is tested by 68-node and 34-node distribution networks.The results show that the feeder can satisfy the requirements of automatic supply transfer only by reconstruction,and to some extent,can improve the economics of the distribution network operation.
引文
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[15]田园,汪可友,李国杰,等.计及风电相关性的二阶锥动态随机最优潮流[J].电力系统自动化,2018,42(5):41-47.DOI:10.7500/AEPS20170605003.TIAN Yuan,WANG Keyou,LI Guojie,et al.Dynamic stochastic optimal power flow based on second-order cone programming considering wind power correlation[J].Automation of Electric Power Systems,2018,42(5):41-47.DOI:10.7500/AEPS20170605003.
[16]JEN C K,CHOU L F,LIN C Y,et al.Exact convex relaxation of OPF for radial networks using branch flow model[C]//IEEE Third International Conference on Smart Grid Communications,November 5-8,2012,Tainan,China:7-12.
[2]SALIS G J,SAFIGIANNI A S.Long-term optimization of radial primary distribution networks by conductor replacements[J].International Journal of Electrical Power&Energy Systems,1999,21(5):349-355.
[3]彭显刚,林利祥,翁奕珊,等.基于模糊综合评判和综合赋权的抗灾型配电网骨干网架规划[J].电力系统自动化,2015,39(12):172-178.PENG Xiangang,LIN Lixiang,WENG Yishan,et al.Decisionmaking method for anti-disaster distribution network backbone upgrade based on fuzzy comprehensive evaluation and comprehensive weights[J].Automation of Electric Power Systems,2015,39(12):172-178.
[4]吴涵,陈彬,管霖,等.供电可靠性提升措施优选的量化评价方法[J].电力自动化设备,2015,35(5):126-130.WU Han,CHEN Bin,GUAN Lin,et al.Quantitative evaluation and optimized selection of power supply reliability enhancement measures[J].Electric Power Automation Equipment,2015,35(5):126-130.
[5]肖峻,徐兵山,张跃,等.一种新的配电网联络线瓶颈分析与改造方法[J].电力系统保护与控制,2012,40(10):35-41.XIAO Jun,XU Bingshan,ZHANG Yue,et al.A new method of bottleneck tie lines analysis and reformation for distribution network[J].Power System Protection and Control,2012,40(10):35-41.
[6]苏韵掣,刘俊勇,刘友波,等.大规模中压配电网可靠性建设改造措施优选模型及求解方法[J].电网技术,2017,41(1):201-209.SU Yunche,LIU Junyong,LIU Youbo,et al.Optimization model of selecting power supply reliability reconstruction measures in large-scale MV distribution network and its solution method[J].Power System Technology,2017,41(1):201-209.
[7]涂春鸣,董泰青,姜飞,等.基于分层分区的配电网差异化节能规划方法研究[J].电力系统保护与控制,2015,43(14):148-154.TU Chunming,DONG Taiqing,JIANG Fei,et al.Research on differentiated energy saving method of partitioned distribution networks based on bi-level planning[J].Power System Protection and Control,2015,43(14):148-154.
[8]吕涛,唐巍,丛鹏伟,等.分布式电源与配电网架多目标协调规划[J].电力系统自动化,2013,37(21):139-145.LTao,TANG Wei,CONG Pengwei,et al.Multi-objective coordinated planning of distribution network incorporating distributed generators[J].Automation of Electric Power Systems,2013,37(21):139-145.
[9]刘佳,程浩忠,肖峻,等.计及N-1安全准则的智能配电网多目标重构策略[J].电力系统自动化,2016,40(7):9-15.LIU Jia,CHENG Haozhong,XIAO Jun,et al.A multiobjective reconfiguration strategy for smart distribution network considering N-1security criterion[J].Automation of Electric Power Systems,2016,40(7):9-15.
[10]肖峻,张婷,张跃,等.基于最大供电能力的配电网规划理念与方法[J].中国电机工程学报,2013,33(10):106-113.XIAO Jun,ZHANG Ting,ZHANG Yue,et al.TSC-based planning idea and method for distribution networks[J].Proceedings of the CSEE,2013,33(10):106-113.
[11]XIAO J,GU W,WANG C,et al.Distribution system security region:definition,model and security assessment[J].IETGeneration Transmission&Distribution,2012,6(10):1029-1035.
[12]潘晶.城市配电网规划自动N-1校验研究[D].天津:天津大学,2008.PAN Jing.Study on automatic N-1verification for urban distribution network planning[D].Tianjin:Tianjin University,2008.
[13]赖晓文,马晓伟,白杨,等.基于混合整数二阶锥规划的动态无功优化方法[J].电力系统自动化,2017,41(17):37-42.DOI:10.7500/AEPS20161101004.LAI Xiaowen,MA Xiaowei,BAI Yang,et al.Dynamic reactive power optimization method based on mixed integer second-order cone programming[J].Automation of Electric Power Systems,2017,41(17):37-42.DOI:10.7500/AEPS20161101004.
[14]刘一兵,吴文传,张伯明,等.基于混合整数二阶锥规划的主动配电网有功-无功协调多时段优化运行[J].中国电机工程学报,2014,34(16):2575-2583.LIU Yibing,WU Wenchuan,ZHANG Boming,et al.A mixed integer second-order cone programming based active and reactive power coordinated multi-period optimization for active distribution network[J].Proceedings of the CSEE,2014,34(16):2575-2583.
[15]田园,汪可友,李国杰,等.计及风电相关性的二阶锥动态随机最优潮流[J].电力系统自动化,2018,42(5):41-47.DOI:10.7500/AEPS20170605003.TIAN Yuan,WANG Keyou,LI Guojie,et al.Dynamic stochastic optimal power flow based on second-order cone programming considering wind power correlation[J].Automation of Electric Power Systems,2018,42(5):41-47.DOI:10.7500/AEPS20170605003.
[16]JEN C K,CHOU L F,LIN C Y,et al.Exact convex relaxation of OPF for radial networks using branch flow model[C]//IEEE Third International Conference on Smart Grid Communications,November 5-8,2012,Tainan,China:7-12.