电气负荷需求日益增长使传输网络所需传输容量增大,网络的固有拓扑结构未能灵活适应负荷变化,易造成传输网络投资成本的浪费,其规划的经济性尚有提升的空间。为了解决上述问题,可通过配电网重构改变网络的功率分布,并计及碳排放成本,对...电气负荷需求日益增长使传输网络所需传输容量增大,网络的固有拓扑结构未能灵活适应负荷变化,易造成传输网络投资成本的浪费,其规划的经济性尚有提升的空间。为了解决上述问题,可通过配电网重构改变网络的功率分布,并计及碳排放成本,对电-气综合能源系统(integrated electricity-gas energy system, IEGES)传输网络进行优化规划。建立考虑配电网重构的IEGES规划模型,使用虚拟功率法约束电网的连通性,通过支路数量约束保证电网的辐射状,并采用增量分段线性法处理气网的非线性约束。模型优化了网络的拓扑结构,改变了配电网络的功率分布,使靠近电源端线路所需传输容量降低,从而减少对新建线路的需求。仿真结果表明,考虑配电网重构的IEGES规划模型可在保证安全性的前提下降低规划的总成本。展开更多
In the traditional power transmission network planning,deterministic analysis methods are widely used.In such methods,all contingencies are deemed to have the same occurrence probability,which is not reasonable.In thi...In the traditional power transmission network planning,deterministic analysis methods are widely used.In such methods,all contingencies are deemed to have the same occurrence probability,which is not reasonable.In this paper,risk assessment is introduced to the process of transmission network planning considering the probabilistic characteristics of contingencies.Risk indices are given to determine the weak points of the transmission network based on local information,such as bus risk,line overload risk,contingency severity.The indices are calculated by the optimal cost control method based on risk theory,which can help planners to quickly determine weak points in the planning and find solution to them.For simplification,only line overload violation is considered.Finally,the proposed method is validated by an IEEE-RTS test system and a real power system in China from two aspects.In the first case,the original system is evaluated by the proposed method to find the weak points,and then four planning schemes are established,among which the best scheme is selected.In the second case,four initial planning schemes are established by combining the experiences of planners,and after the evaluation by using the proposed method,the best planning scheme is improved based on the information of weak points in the initial schemes,and the risk of improved scheme is reduced from 42 531.86 MW·h per year to 4 431.26 MW·h per year.展开更多
文摘电气负荷需求日益增长使传输网络所需传输容量增大,网络的固有拓扑结构未能灵活适应负荷变化,易造成传输网络投资成本的浪费,其规划的经济性尚有提升的空间。为了解决上述问题,可通过配电网重构改变网络的功率分布,并计及碳排放成本,对电-气综合能源系统(integrated electricity-gas energy system, IEGES)传输网络进行优化规划。建立考虑配电网重构的IEGES规划模型,使用虚拟功率法约束电网的连通性,通过支路数量约束保证电网的辐射状,并采用增量分段线性法处理气网的非线性约束。模型优化了网络的拓扑结构,改变了配电网络的功率分布,使靠近电源端线路所需传输容量降低,从而减少对新建线路的需求。仿真结果表明,考虑配电网重构的IEGES规划模型可在保证安全性的前提下降低规划的总成本。
基金Supported by Major State Basic Research Program of China ("973" Program,No. 2009CB219700 and No. 2010CB23460)Tianjin Municipal Science and Technology Development Program (No. 09JCZDJC25000)Specialized Research Fund for the Doctoral Program of Higher Education of China (No.20090032110064)
文摘In the traditional power transmission network planning,deterministic analysis methods are widely used.In such methods,all contingencies are deemed to have the same occurrence probability,which is not reasonable.In this paper,risk assessment is introduced to the process of transmission network planning considering the probabilistic characteristics of contingencies.Risk indices are given to determine the weak points of the transmission network based on local information,such as bus risk,line overload risk,contingency severity.The indices are calculated by the optimal cost control method based on risk theory,which can help planners to quickly determine weak points in the planning and find solution to them.For simplification,only line overload violation is considered.Finally,the proposed method is validated by an IEEE-RTS test system and a real power system in China from two aspects.In the first case,the original system is evaluated by the proposed method to find the weak points,and then four planning schemes are established,among which the best scheme is selected.In the second case,four initial planning schemes are established by combining the experiences of planners,and after the evaluation by using the proposed method,the best planning scheme is improved based on the information of weak points in the initial schemes,and the risk of improved scheme is reduced from 42 531.86 MW·h per year to 4 431.26 MW·h per year.
