This paper built a combined heat and power（CHP） dispatch model for wind-CHP system with solid heat storage device（SHS） aiming at minimizing system coal consumption, and set system demand-supply balance and units＇...This paper built a combined heat and power（CHP） dispatch model for wind-CHP system with solid heat storage device（SHS） aiming at minimizing system coal consumption, and set system demand-supply balance and units＇ operation conditions as the operation constraints. Furthermore, robust stochastic optimization theory was used to describe wind power output uncertainty. The simulation result showed that SHS increased CHP peak-valley shifting capability and reduced abandoned wind rate from 12% to 6%, and reduced 5% coal consumption, compared with the original system operation by flexible charging electric power and heating. The payback period of employing SHS in wind-CHP system is far shorter than SHS expected service life.展开更多
A theoretical study was conducted on finding optimal paths in transportation networks where link travel times were stochastic and time-dependent(STD). The methodology of relative robust optimization was applied as mea...A theoretical study was conducted on finding optimal paths in transportation networks where link travel times were stochastic and time-dependent(STD). The methodology of relative robust optimization was applied as measures for comparing time-varying, random path travel times for a priori optimization. In accordance with the situation in real world, a stochastic consistent condition was provided for the STD networks and under this condition, a mathematical proof was given that the STD robust optimal path problem can be simplified into a minimum problem in specific time-dependent networks. A label setting algorithm was designed and tested to find travelers' robust optimal path in a sampled STD network with computation complexity of O(n2+n·m). The validity of the robust approach and the designed algorithm were confirmed in the computational tests. Compared with conventional probability approach, the proposed approach is simple and efficient, and also has a good application prospect in navigation system.展开更多
In response to the limitedworking capacity and poor energy interaction efficiency of microgrids,it is now common to use multiple microgrids to form microgrid clusters to enhance the reliability of power supply between...In response to the limitedworking capacity and poor energy interaction efficiency of microgrids,it is now common to use multiple microgrids to form microgrid clusters to enhance the reliability of power supply between each other and further improve the penetration rate of distributed power sources.This article focuses on the energy development method of microgrid groups and the problem of scheduling optimization of integrated energy system is discussed for hot and cold electricity within the microgrid group.Firstly,the basic composition ideas of the electric heating interconnection system,electrical interconnection system,and cold and hot electrical interconnection system within the microgrid group were designed layer by layer,and the functional characteristics of the energy equipment within the microgrid group were clarified.Then,in response to the impact of wind and solar uncertainty on system operation,the goal cascading method and robust stochastic optimization method are used to gradually construct a coupled scheduling model for electric heating,a multi-objective scheduling model for electrical interconnection,and a coordinated scheduling optimization model for cold and hot electrical interconnection.Finally,the effectiveness and applicability of the proposed model were verified through case analysis of the relevant models mentioned above,and key factors were selected for sensitivity analysis,providing reliable methodological support for optimizing the operation of an integrated energy system.展开更多
基金Supported by the Fundamental Research Funds for the National Science Foundation of China(71573084)
文摘This paper built a combined heat and power（CHP） dispatch model for wind-CHP system with solid heat storage device（SHS） aiming at minimizing system coal consumption, and set system demand-supply balance and units＇ operation conditions as the operation constraints. Furthermore, robust stochastic optimization theory was used to describe wind power output uncertainty. The simulation result showed that SHS increased CHP peak-valley shifting capability and reduced abandoned wind rate from 12% to 6%, and reduced 5% coal consumption, compared with the original system operation by flexible charging electric power and heating. The payback period of employing SHS in wind-CHP system is far shorter than SHS expected service life.
基金Project(71001079)supported by the National Natural Science Foundation of China
文摘A theoretical study was conducted on finding optimal paths in transportation networks where link travel times were stochastic and time-dependent(STD). The methodology of relative robust optimization was applied as measures for comparing time-varying, random path travel times for a priori optimization. In accordance with the situation in real world, a stochastic consistent condition was provided for the STD networks and under this condition, a mathematical proof was given that the STD robust optimal path problem can be simplified into a minimum problem in specific time-dependent networks. A label setting algorithm was designed and tested to find travelers' robust optimal path in a sampled STD network with computation complexity of O(n2+n·m). The validity of the robust approach and the designed algorithm were confirmed in the computational tests. Compared with conventional probability approach, the proposed approach is simple and efficient, and also has a good application prospect in navigation system.
文摘In response to the limitedworking capacity and poor energy interaction efficiency of microgrids,it is now common to use multiple microgrids to form microgrid clusters to enhance the reliability of power supply between each other and further improve the penetration rate of distributed power sources.This article focuses on the energy development method of microgrid groups and the problem of scheduling optimization of integrated energy system is discussed for hot and cold electricity within the microgrid group.Firstly,the basic composition ideas of the electric heating interconnection system,electrical interconnection system,and cold and hot electrical interconnection system within the microgrid group were designed layer by layer,and the functional characteristics of the energy equipment within the microgrid group were clarified.Then,in response to the impact of wind and solar uncertainty on system operation,the goal cascading method and robust stochastic optimization method are used to gradually construct a coupled scheduling model for electric heating,a multi-objective scheduling model for electrical interconnection,and a coordinated scheduling optimization model for cold and hot electrical interconnection.Finally,the effectiveness and applicability of the proposed model were verified through case analysis of the relevant models mentioned above,and key factors were selected for sensitivity analysis,providing reliable methodological support for optimizing the operation of an integrated energy system.
