The security constrained distributed optimal power flow (DOPF) of interconnected power systems is presented. The centralized OPF problem of the multi-area power systems is decom-posed into independent DOPF subproblems...The security constrained distributed optimal power flow (DOPF) of interconnected power systems is presented. The centralized OPF problem of the multi-area power systems is decom-posed into independent DOPF subproblems, one for each area. The dynamic security region (DSR) to guarantee the transient stability constraints and static voltage stability region (SVSR) constraints, and line current limits are included as constraints. The solutions to the DOPF subproblems of the different areas are coordinated through a pricing mechanism until they converge to the centralized OPF solution. The nonlinear DOPF subproblem is solved by predictor-corrector interior point method (PCIPM). The IEEE three-area RTS-96 system is worked out in order to demonstrate the effectiveness of the proposed method.展开更多
This paper proposes a distributed robust optimal dispatch model to enhance information security and interaction among the operators in the regional integrated energy system(RIES).Our model regards the distribution net...This paper proposes a distributed robust optimal dispatch model to enhance information security and interaction among the operators in the regional integrated energy system(RIES).Our model regards the distribution network and each energy hub(EH)as independent operators and employs robust optimization to improve operational security caused by wind and photovoltaic(PV)power output uncertainties,with only deterministic information exchanged across boundaries.This paper also adopts the alternating direction method of multipliers(ADMM)algorithm to facilitate secure information interaction among multiple RIES operators,maximizing the benefit for each subject.Furthermore,the traditional ADMM algorithm with fixed step size is modified to be adaptive,addressing issues of redundant interactions caused by suboptimal initial step size settings.A case study validates the effectiveness of the proposed model,demonstrating the superiority of the ADMM algorithm with adaptive step size and the economic benefits of the distributed robust optimal dispatch model over the distributed stochastic optimal dispatch model.展开更多
In this paper,a new Distribution Management System(DMS)framework based on security region is proposed.First,the concept of Distribution System Security Region(DSSR)is introduced.DSSR is capable to describe the N-1 sec...In this paper,a new Distribution Management System(DMS)framework based on security region is proposed.First,the concept of Distribution System Security Region(DSSR)is introduced.DSSR is capable to describe the N-1 security boundary of the whole distribution network,including the secure output range of DGs.This new theoretic tool provides a chance for the implementation of real-time security analysis and active controls in DMS.Second,this paper proposes and describes five security states for distribution system.Third,an upgraded DMS enhanced with DSSR is proposed,which consists of advanced security functions such as preventive and predictive control of the trajectory of operating points.Finally,a practical case is presented to simulate the proposed DSSR-enhanced DMS,in which both the security region of network and the output range of DGs are calculated.Typical security functions are also demonstrated.In conclusion,the new DMS framework aims to help operate the system closed to its security boundary in order to improve the efficiency significantly within same security standard.This work is beneficial for future low carbon distribution systems with high penetration rate of DGs.展开更多
安全域体积描述了配电网安全运行范围大小,是配电网安全域(distribution system security region,DSSR)的一个重要指标。该文提出了有源配电网N-0(DSSR0)和N-1下安全域体积的定义和新算法。首先,将有源网安全域体积定义为状态空间中的n...安全域体积描述了配电网安全运行范围大小,是配电网安全域(distribution system security region,DSSR)的一个重要指标。该文提出了有源配电网N-0(DSSR0)和N-1下安全域体积的定义和新算法。首先,将有源网安全域体积定义为状态空间中的n重积分,与现有无源网安全域体积定义的区别有:1)积分变量不同。无源网采用馈线负荷,有源网采用节点净功率。2)状态空间所在象限不同。无源网安全域位于第一象限,有源网安全域位于全象限。其次,提出了基于拟蒙特卡罗的新算法,适用于有源网和无源网安全域体积计算。相比于现有算法,有更好的精度和速度,且适用于直流潮流和交流潮流的安全域模型。最后,采用算例验证了该文定义和算法。深入分析得到了分布式电源接入位置与渗透率对N-0和N-1下安全域体积的影响规律和原因。展开更多
The region-based method has been applied in transmission systems and traditional passive distribution systems without power sources. This paper proposes the model of total quadrant security region(TQSR) for active dis...The region-based method has been applied in transmission systems and traditional passive distribution systems without power sources. This paper proposes the model of total quadrant security region(TQSR) for active distribution networks(ADN) with high penetration of distributed generation(DG). Firstly, TQSR is defined as a closed set of all the N-1 secure operation points in the state space of ADN. Then, the TQSR is modeled considering the constraints of state space,normal operation and N-1 security criterion. Then, the characteristics of TQSR are observed and analyzed on the test systems with different DG penetrations. TQSR can be located in any quadrant of the state space. For different DG penetrations,the shape and security features of TQSR are also different. Finally, the region map is discovered, which summarizes the features of different types of distribution networks.展开更多
该文从数学上描述了配电系统的N-1安全性,给出了安全域(distribution system security region,DSSR)的严格数学定义,并首次证明DSSR的存在性。首先,从数学上描述了配电系统运行的状态空间与正常运行方式下的约束条件。其次,为描述N-1安...该文从数学上描述了配电系统的N-1安全性,给出了安全域(distribution system security region,DSSR)的严格数学定义,并首次证明DSSR的存在性。首先,从数学上描述了配电系统运行的状态空间与正常运行方式下的约束条件。其次,为描述N-1安全性及安全程度,提出了安全函数的概念,并给出一个具体的安全函数,并证明其具有连续和单调减的重要性质。再从数学上将N-1安全性描述为安全函数满足某个预定临界值的问题。然后,给出了更严格的DSSR数学定义:DSSR是所有安全工作点的集合,该集合具有封闭的边界,边界内部均为安全工作点,外部均为不安全工作点。最后,从数学上证明了对于任意给定配电网,其DSSR一定存在。文中工作对揭示配电网安全域的数学本质具有重要意义,为未来智能配电系统安全高效的运行及规划技术奠定理论基础。展开更多
该文提出了配电系统安全域(distribution system security region,DSSR)体积的概念与算法,分析了DSSR体积对电网的意义。首先,对DSSR体积进行了定义,DSSR描述了配电系统满足N-1安全的运行范围,体积是DSSR大小的度量。其次,提出了DSSR高...该文提出了配电系统安全域(distribution system security region,DSSR)体积的概念与算法,分析了DSSR体积对电网的意义。首先,对DSSR体积进行了定义,DSSR描述了配电系统满足N-1安全的运行范围,体积是DSSR大小的度量。其次,提出了DSSR高效运行区的体积定义。再次,提出了基于蒙特卡罗仿真的DSSR体积算法。最后,通过算例验证了体积算法,并进一步研究了体积的用途。DSSR体积能提供一些最大供电能力(total supply capacity,TSC)无法给出的重要信息,选取TSC相同但DSSR体积不同的电网比较,发现体积大的电网具有更好的安全性能,在各个负荷增长方向上的安全裕量更均衡。该文提出的DSSR体积是反映配电网安全性能的新指标,对未来配电网的规划和运行具有重要的应用价值。展开更多
主动配电网以其较强的控制能力可以接纳大量分布式电源(DG),文章在配电系统安全域(distribution system security region,DSSR)的基础上提出了DG及微网的运行域。首先,考虑DG及微网的接入位置、出力大小以及渗透率等因素对配电网的影响...主动配电网以其较强的控制能力可以接纳大量分布式电源(DG),文章在配电系统安全域(distribution system security region,DSSR)的基础上提出了DG及微网的运行域。首先,考虑DG及微网的接入位置、出力大小以及渗透率等因素对配电网的影响,提出了DG及微网运行域的概念:运行域描述了保证配电网安全前提下的DG及微网出力范围,能方便地用于对DG及微网的主动调度。其次,提出了DG及微网运行域的数学模型及计算方法,能计算得到满足电压、潮流等约束下不同类型DG及微网的运行域。最后,利用IEEE 33节点算例,计算得出PQ型和PV型的DG及微网运行域,并与不含DG和微网的负荷运行域进行对比分析,验证了所提方法的有效性。DG或微网的加入导致运行域面积增大,拓扑结构更加复杂;相同条件下,PV型微网比PQ型微网运行域面积更大。展开更多
提出了一种基于配电系统安全域(DSSR)的网络重构新方法。首先,介绍了DSSR的安全裕度指标——安全距离,其含义为配电网满足N?1安全准则的馈线负荷最大可增功率。其次,建立了在优先满足安全约束的条件下以网损最小为目标的网络重构模型,...提出了一种基于配电系统安全域(DSSR)的网络重构新方法。首先,介绍了DSSR的安全裕度指标——安全距离,其含义为配电网满足N?1安全准则的馈线负荷最大可增功率。其次,建立了在优先满足安全约束的条件下以网损最小为目标的网络重构模型,并利用改进的遗传算法进行求解。最后,采用扩展的IEEE RBTS Bus 4算例验证模型的有效性。与经典网损最小模型对比表明,文中重构结果的网损与其接近,但安全裕度明显增加。与负载均衡模型对比,文中的安全裕度和网损均更优,这是由于模型能有效计及电网结构和负载分布不均的自然特性。此外,文中模型还能针对不同馈线设置个性化的安全约束,区别用户对安全性的不同需求。展开更多
基金National Natural Science Foundation of China(No.50595413)National Key Basic Research Program ("973" Program) (No.2004CB217904)
文摘The security constrained distributed optimal power flow (DOPF) of interconnected power systems is presented. The centralized OPF problem of the multi-area power systems is decom-posed into independent DOPF subproblems, one for each area. The dynamic security region (DSR) to guarantee the transient stability constraints and static voltage stability region (SVSR) constraints, and line current limits are included as constraints. The solutions to the DOPF subproblems of the different areas are coordinated through a pricing mechanism until they converge to the centralized OPF solution. The nonlinear DOPF subproblem is solved by predictor-corrector interior point method (PCIPM). The IEEE three-area RTS-96 system is worked out in order to demonstrate the effectiveness of the proposed method.
基金supported in part by the National Natural Science Foundation of China(No.52107085)the Natural Science Foundation of Jiangsu Province(No.BK20210367)。
文摘This paper proposes a distributed robust optimal dispatch model to enhance information security and interaction among the operators in the regional integrated energy system(RIES).Our model regards the distribution network and each energy hub(EH)as independent operators and employs robust optimization to improve operational security caused by wind and photovoltaic(PV)power output uncertainties,with only deterministic information exchanged across boundaries.This paper also adopts the alternating direction method of multipliers(ADMM)algorithm to facilitate secure information interaction among multiple RIES operators,maximizing the benefit for each subject.Furthermore,the traditional ADMM algorithm with fixed step size is modified to be adaptive,addressing issues of redundant interactions caused by suboptimal initial step size settings.A case study validates the effectiveness of the proposed model,demonstrating the superiority of the ADMM algorithm with adaptive step size and the economic benefits of the distributed robust optimal dispatch model over the distributed stochastic optimal dispatch model.
基金This work was supported by the National Natural Science Foundation of China(51477112)National Natural Science Foundation of China(51277129).
文摘In this paper,a new Distribution Management System(DMS)framework based on security region is proposed.First,the concept of Distribution System Security Region(DSSR)is introduced.DSSR is capable to describe the N-1 security boundary of the whole distribution network,including the secure output range of DGs.This new theoretic tool provides a chance for the implementation of real-time security analysis and active controls in DMS.Second,this paper proposes and describes five security states for distribution system.Third,an upgraded DMS enhanced with DSSR is proposed,which consists of advanced security functions such as preventive and predictive control of the trajectory of operating points.Finally,a practical case is presented to simulate the proposed DSSR-enhanced DMS,in which both the security region of network and the output range of DGs are calculated.Typical security functions are also demonstrated.In conclusion,the new DMS framework aims to help operate the system closed to its security boundary in order to improve the efficiency significantly within same security standard.This work is beneficial for future low carbon distribution systems with high penetration rate of DGs.
文摘安全域体积描述了配电网安全运行范围大小,是配电网安全域(distribution system security region,DSSR)的一个重要指标。该文提出了有源配电网N-0(DSSR0)和N-1下安全域体积的定义和新算法。首先,将有源网安全域体积定义为状态空间中的n重积分,与现有无源网安全域体积定义的区别有:1)积分变量不同。无源网采用馈线负荷,有源网采用节点净功率。2)状态空间所在象限不同。无源网安全域位于第一象限,有源网安全域位于全象限。其次,提出了基于拟蒙特卡罗的新算法,适用于有源网和无源网安全域体积计算。相比于现有算法,有更好的精度和速度,且适用于直流潮流和交流潮流的安全域模型。最后,采用算例验证了该文定义和算法。深入分析得到了分布式电源接入位置与渗透率对N-0和N-1下安全域体积的影响规律和原因。
基金supported in part by National Key Research and Development Program of China (No. 2016YFB0900100)National Natural Science Foundation of China (No. 51877144)China Postdoctoral Science Foundation (No.2020M670668)。
文摘The region-based method has been applied in transmission systems and traditional passive distribution systems without power sources. This paper proposes the model of total quadrant security region(TQSR) for active distribution networks(ADN) with high penetration of distributed generation(DG). Firstly, TQSR is defined as a closed set of all the N-1 secure operation points in the state space of ADN. Then, the TQSR is modeled considering the constraints of state space,normal operation and N-1 security criterion. Then, the characteristics of TQSR are observed and analyzed on the test systems with different DG penetrations. TQSR can be located in any quadrant of the state space. For different DG penetrations,the shape and security features of TQSR are also different. Finally, the region map is discovered, which summarizes the features of different types of distribution networks.
文摘该文从数学上描述了配电系统的N-1安全性,给出了安全域(distribution system security region,DSSR)的严格数学定义,并首次证明DSSR的存在性。首先,从数学上描述了配电系统运行的状态空间与正常运行方式下的约束条件。其次,为描述N-1安全性及安全程度,提出了安全函数的概念,并给出一个具体的安全函数,并证明其具有连续和单调减的重要性质。再从数学上将N-1安全性描述为安全函数满足某个预定临界值的问题。然后,给出了更严格的DSSR数学定义:DSSR是所有安全工作点的集合,该集合具有封闭的边界,边界内部均为安全工作点,外部均为不安全工作点。最后,从数学上证明了对于任意给定配电网,其DSSR一定存在。文中工作对揭示配电网安全域的数学本质具有重要意义,为未来智能配电系统安全高效的运行及规划技术奠定理论基础。
文摘主动配电网以其较强的控制能力可以接纳大量分布式电源(DG),文章在配电系统安全域(distribution system security region,DSSR)的基础上提出了DG及微网的运行域。首先,考虑DG及微网的接入位置、出力大小以及渗透率等因素对配电网的影响,提出了DG及微网运行域的概念:运行域描述了保证配电网安全前提下的DG及微网出力范围,能方便地用于对DG及微网的主动调度。其次,提出了DG及微网运行域的数学模型及计算方法,能计算得到满足电压、潮流等约束下不同类型DG及微网的运行域。最后,利用IEEE 33节点算例,计算得出PQ型和PV型的DG及微网运行域,并与不含DG和微网的负荷运行域进行对比分析,验证了所提方法的有效性。DG或微网的加入导致运行域面积增大,拓扑结构更加复杂;相同条件下,PV型微网比PQ型微网运行域面积更大。
文摘提出了一种基于配电系统安全域(DSSR)的网络重构新方法。首先,介绍了DSSR的安全裕度指标——安全距离,其含义为配电网满足N?1安全准则的馈线负荷最大可增功率。其次,建立了在优先满足安全约束的条件下以网损最小为目标的网络重构模型,并利用改进的遗传算法进行求解。最后,采用扩展的IEEE RBTS Bus 4算例验证模型的有效性。与经典网损最小模型对比表明,文中重构结果的网损与其接近,但安全裕度明显增加。与负载均衡模型对比,文中的安全裕度和网损均更优,这是由于模型能有效计及电网结构和负载分布不均的自然特性。此外,文中模型还能针对不同馈线设置个性化的安全约束,区别用户对安全性的不同需求。