电网中的不同电力公司所管辖子系统具有相互独立且互联的特点,各子系统之间的互联给电网的分布式计算带来一定挑战,如何实现大系统的分布式计算备受关注。提出基于交替方向乘子法(alternating directionmethod of multipliers,ADMM)的...电网中的不同电力公司所管辖子系统具有相互独立且互联的特点,各子系统之间的互联给电网的分布式计算带来一定挑战,如何实现大系统的分布式计算备受关注。提出基于交替方向乘子法(alternating directionmethod of multipliers,ADMM)的含风电场系统分布式直流最优潮流(direct current optimal power flow,DC-OPF)计算模型,该模型考虑风电并网对系统分布式DC-OPF的影响,采用分解协调法实现系统的分区过程,通过引入全局变量处理边界节点问题,在信息传递过程中无需中心处理系统,只在相邻子区域之间进行复制边界节点的信息传递以减少信息通信量,实现系统的全分布式DC-OPF计算。以6节点系统、IEEE-39节点系统分析全局变量的个数对迭代收敛的影响,并讨论风电并网对优化收敛的影响,最后通过仿真验证该文所提模型的准确性和有效性。展开更多
A unified power flow controller(UPFC)combines the advantages of various flexible alternating current transmission system(FACTS)devices into a powerful format.Using a 500 kV power grid,this study evaluates the selectio...A unified power flow controller(UPFC)combines the advantages of various flexible alternating current transmission system(FACTS)devices into a powerful format.Using a 500 kV power grid,this study evaluates the selection and use of a UPFC to improve transmission capacity.The"UPFC unit capacity control proportionality coefficient"is introduced to quantify the control effect of the UPFC,and an optimal calculation method for the UPFC capacity is presented.Following the proposal of a UPFC site selection process,the data of an existing power grid is used to conduct simulations.The simulation results show that the UPFC has a strong ability to improve transmission capacity,and its use is greatly advantageous.Additionally,by applying the proposed selection method,the control effect and economic benefits of the UPFC can be comprehensively considered during project site selection.These findings have a guiding significance for UPFC site selection in ultra-high voltage power grids.展开更多
基于交替方向乘子法(ADMM)在分布式形式下解决主动配电系统最优潮流问题(OPF),针对分布式算法性能受到配电系统区域划分影响的问题,提出了一种基于量测数据驱动的电网分区方法,以加速优化算法的收敛速度。与传统的ADMM算法依赖于全局信...基于交替方向乘子法(ADMM)在分布式形式下解决主动配电系统最优潮流问题(OPF),针对分布式算法性能受到配电系统区域划分影响的问题,提出了一种基于量测数据驱动的电网分区方法,以加速优化算法的收敛速度。与传统的ADMM算法依赖于全局信息不同,本文引入了一致性方法来协调区域交界的平衡问题,从而实现最优潮流问题的完全分布式求解。此外,本文采用LinDistFlow(Linearized Distribution Flow)交流近似模型来应对配电网最优潮流问题的非凸性挑战。通过在不同规模的IEEE配电网案例上进行测试,验证了所提方法的有效性,且其在优化算法的迭代次数、计算时间和误差精度等性能上均优于其他分区方法。展开更多
文摘电网中的不同电力公司所管辖子系统具有相互独立且互联的特点,各子系统之间的互联给电网的分布式计算带来一定挑战,如何实现大系统的分布式计算备受关注。提出基于交替方向乘子法(alternating directionmethod of multipliers,ADMM)的含风电场系统分布式直流最优潮流(direct current optimal power flow,DC-OPF)计算模型,该模型考虑风电并网对系统分布式DC-OPF的影响,采用分解协调法实现系统的分区过程,通过引入全局变量处理边界节点问题,在信息传递过程中无需中心处理系统,只在相邻子区域之间进行复制边界节点的信息传递以减少信息通信量,实现系统的全分布式DC-OPF计算。以6节点系统、IEEE-39节点系统分析全局变量的个数对迭代收敛的影响,并讨论风电并网对优化收敛的影响,最后通过仿真验证该文所提模型的准确性和有效性。
基金supported by State Grid Corporation’s Science and Technology Project“Research and Demonstration of Technical Measures for Improving Voltage Supporting Capacity of Large-scale Urban Power Grid”(52094016000Y)
文摘A unified power flow controller(UPFC)combines the advantages of various flexible alternating current transmission system(FACTS)devices into a powerful format.Using a 500 kV power grid,this study evaluates the selection and use of a UPFC to improve transmission capacity.The"UPFC unit capacity control proportionality coefficient"is introduced to quantify the control effect of the UPFC,and an optimal calculation method for the UPFC capacity is presented.Following the proposal of a UPFC site selection process,the data of an existing power grid is used to conduct simulations.The simulation results show that the UPFC has a strong ability to improve transmission capacity,and its use is greatly advantageous.Additionally,by applying the proposed selection method,the control effect and economic benefits of the UPFC can be comprehensively considered during project site selection.These findings have a guiding significance for UPFC site selection in ultra-high voltage power grids.
文摘基于交替方向乘子法(ADMM)在分布式形式下解决主动配电系统最优潮流问题(OPF),针对分布式算法性能受到配电系统区域划分影响的问题,提出了一种基于量测数据驱动的电网分区方法,以加速优化算法的收敛速度。与传统的ADMM算法依赖于全局信息不同,本文引入了一致性方法来协调区域交界的平衡问题,从而实现最优潮流问题的完全分布式求解。此外,本文采用LinDistFlow(Linearized Distribution Flow)交流近似模型来应对配电网最优潮流问题的非凸性挑战。通过在不同规模的IEEE配电网案例上进行测试,验证了所提方法的有效性,且其在优化算法的迭代次数、计算时间和误差精度等性能上均优于其他分区方法。
