The optimization process of embedded, or DG （distributed generation） is a very complex task, and it should be evaluated and compared by means of multi-criteria methods of analysis. The classical method for selection...The optimization process of embedded, or DG （distributed generation） is a very complex task, and it should be evaluated and compared by means of multi-criteria methods of analysis. The classical method for selection is usually based only on a single criterion analysis, and it is defined by thermal or economic aspects. The problem of optimal dispatch of DG is typical example of optimization, because it differs from the classical problem of generation dispatch in the power system, due to the specific criteria related to the DG interconnection. The most important goals are to maximize the renewable production and to minimize the total cost, while satisfying additional constraints related to the operation of a distribution network. As there are many DGs in a distribution network, it is very complicated to decide the optimal DG outputs to satisfy all the criteria and constraints imposed by the distribution network. Another problem is the lack of the dispatcher control over DGs, and very often, the only available action is to switch on or off the generator. Finally, network operator and DG owner perspective are often opposed regarding appropriate control action in the network. In this paper, a multicriteria decision support based on AHP （analytical hierarchical processes） method is proposed for the choice of the dispatching action. The method is illustrated on the choice of the DG to be switched off in the case or reverse power flow.展开更多
In this paper,5 investigations on the current states of power distribution grids in China have been introduced that cover the surveys of the practical distribution asset utilization,the simultaneity factor of feeder l...In this paper,5 investigations on the current states of power distribution grids in China have been introduced that cover the surveys of the practical distribution asset utilization,the simultaneity factor of feeder loading,the load compositions and characteristics,the urban reliability and the integration of distributed generations of renewable resources.Based on the survey results in the investigations,12 Facts are clearly presented.It shows that the challenges to modernize the distribution grids in China are to improve the asset utilization rates,the electricity efficiencies and the reliability of distribution systems,as well as to integrate increasing amount of variable distributed renewable resources.Furthermore based on the challenges,8 R&D opportunities have been identified.展开更多
文摘The optimization process of embedded, or DG （distributed generation） is a very complex task, and it should be evaluated and compared by means of multi-criteria methods of analysis. The classical method for selection is usually based only on a single criterion analysis, and it is defined by thermal or economic aspects. The problem of optimal dispatch of DG is typical example of optimization, because it differs from the classical problem of generation dispatch in the power system, due to the specific criteria related to the DG interconnection. The most important goals are to maximize the renewable production and to minimize the total cost, while satisfying additional constraints related to the operation of a distribution network. As there are many DGs in a distribution network, it is very complicated to decide the optimal DG outputs to satisfy all the criteria and constraints imposed by the distribution network. Another problem is the lack of the dispatcher control over DGs, and very often, the only available action is to switch on or off the generator. Finally, network operator and DG owner perspective are often opposed regarding appropriate control action in the network. In this paper, a multicriteria decision support based on AHP （analytical hierarchical processes） method is proposed for the choice of the dispatching action. The method is illustrated on the choice of the DG to be switched off in the case or reverse power flow.
基金supported by the Key Project of National Social Science Foundation of China(Grant No.12&ZD208)
文摘In this paper,5 investigations on the current states of power distribution grids in China have been introduced that cover the surveys of the practical distribution asset utilization,the simultaneity factor of feeder loading,the load compositions and characteristics,the urban reliability and the integration of distributed generations of renewable resources.Based on the survey results in the investigations,12 Facts are clearly presented.It shows that the challenges to modernize the distribution grids in China are to improve the asset utilization rates,the electricity efficiencies and the reliability of distribution systems,as well as to integrate increasing amount of variable distributed renewable resources.Furthermore based on the challenges,8 R&D opportunities have been identified.
