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It has been known that the second-order conic programming (SOCP) relaxation of an alternating current optimal power flow (ac OPF) problem is a computationally friendly formulation, whereas the semidefinite programming (SDP) relaxation is a theoretically stronger one. This paper presents a method to strengthen the (SOCP) relaxation by generating new cutting planes, i.e., valid inequalities, using SDP...
As the end point of power delivery, a distribution system is directly connected with the consumers. It has complex structures and various operation modes which make the reliability even more important. However, the traditional FMEA cannot be applied to the complex distribution system which contains ring networks. Taking the capacity constraint of distribution system into consideration, this paper...
As the end point of the power system, a distribution system directly connects with the consumers. The reliability of power supply is directly related with consumers. However, uncertainty of the original parameters of components may be caused by lacking of statistical information and the statistic error. It will inevitably produce large errors if we directly use these parameters for evaluation. The...
Currently the development of large scale electric vehicles have become governments' focus of attention. Based on the research of charging and discharging power models, the paper puts forward the island formation strategy and establishes the distribution system reliability model with the electric vehicles. The Monte Carlo time sequential simulation is used to evaluate the effects of different vehicle...
The paper focuses on the study of environmental effects that electric vehicle might cause if they were connected to the distribution grid. A comprehensive evaluation index system is proposed in a quantitative way to describe the environmental effects, such as the pollutant reduction validity and greenhouse gas reduction validity. In order to ensure the economical efficiency of the system, the comprehensive...
Based on the in-depth analysis of urban network's characteristics, a comprehensive model composed of an evaluation index system and a novel evaluation methodology is described for studying environmental effects that planning schemes might cause if they were implemented. The novel model focuses on various typical perspectives, such as pollution emissions, carbon emissions and environmental coordination...
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