In this paper, we study the output regulation problem of discrete linear time-delay systems by output feedback control. We have established some results parallel to those for the output regulation problem of continuou...In this paper, we study the output regulation problem of discrete linear time-delay systems by output feedback control. We have established some results parallel to those for the output regulation problem of continuous linear time-delay systems.展开更多
通过耦合城市时变增益非线性模型(time variant gain model-urban,TVGM-urban)和暴雨洪水管理模型(storm water management model,SWMM),模拟并分析了不同类型的城市下垫面产流非线性变化过程。以深圳市光明新区海绵城市建设示范区为研...通过耦合城市时变增益非线性模型(time variant gain model-urban,TVGM-urban)和暴雨洪水管理模型(storm water management model,SWMM),模拟并分析了不同类型的城市下垫面产流非线性变化过程。以深圳市光明新区海绵城市建设示范区为研究对象,基于耦合的TVGM-SWMM模型,模拟了该地区的降雨-径流响应过程,并进一步分析了不同低影响开发(low impact development,LID)模式布设面积对径流调蓄的影响。结果表明:1)在大多数情况下,TVGM-SWMM模型的模拟效果优于SWMM模型,其原因在于前者考虑了城市地区降雨径流的非线性响应关系,并且强调了降雨强度对产流的影响;同时,TVGM-SWMM模型需要的产流参数较少,减少了对城市地区基础数据资料的需求;2)在不同设计暴雨重现期下,TVGM-SWMM模型模拟的径流过程更加符合降雨变化情况,对应的洪峰流量与最大雨强相关性更高;3)研究区LID设施的径流调蓄能力与其布设面积成正相关,其效果随暴雨重现期的增长相对减弱;相同布设面积情景下,下沉式绿地的调蓄效果优于绿色屋顶。展开更多
Territory risk analysis has played an important role in the decision-making of auto insurance rate regulation.Due to the optimality of insurance loss data groupings,clustering methods become the natural choice for suc...Territory risk analysis has played an important role in the decision-making of auto insurance rate regulation.Due to the optimality of insurance loss data groupings,clustering methods become the natural choice for such territory risk classification.In this work,spatially constrained clustering is first applied to insurance loss data to form rating territories.The generalized linear model(GLM)and generalized linear mixed model(GLMM)are then proposed to derive the risk relativities of obtained clusters.Each basic rating unit within the same cluster,namely Forward Sortation Area(FSA),takes the same risk relativity value as its cluster.The obtained risk relativities from GLM or GLMM are used to calculate the performance metrics,including RMSE,MAD,and Gini coefficients.The spatially constrained clustering and the risk relativity estimate help obtain a set of territory risk benchmarks used in rate filings to guide the rate regulation process.展开更多
A novel non-linear stochastic method based on a Mixed-Integer Linear Programming(MILP)optimization model is proposed to optimally manage a high number of photovoltaic(PV)-battery systems for the provision of up and do...A novel non-linear stochastic method based on a Mixed-Integer Linear Programming(MILP)optimization model is proposed to optimally manage a high number of photovoltaic(PV)-battery systems for the provision of up and down regulation in the ancillary services market.This method,considers both the technical constraints of the power system,and those of the equipment used by all the prosumers.This allows an aggregator of many residential prosumers endowed with photovoltaic(PV)-battery systems to evaluate the baseline of the aggregate by minimizing the costs related to the electrical energy absorbed from the grid and then to assess the up and down flexibility curves with relative offer prices.As confirmed by simulation results carried out considering different realistic case studies,the method can effectively be used by an aggregator to evaluate the economic impact of its participation in the ancillary services market,both for the aggregator and for its prosumers.展开更多
An automatic control technique for the flow regulation in pipeline systems is developed in the paper. The improvement for the previous work is the use of an optimal observer that reduces greatly the time of changing n...An automatic control technique for the flow regulation in pipeline systems is developed in the paper. The improvement for the previous work is the use of an optimal observer that reduces greatly the time of changing now states and the adaptability for the regulation of frictioness now. By first order Taylor-expanding the frictioness flow equations of motion and continuity at equilibrium states, a set of linear equations are obtained then, the linear quadratic design technique in automatic control theory is used to control the now states. In order to avoid measuring all states, an optimal state estimator is constructed. A pipeline system is taken as example. The regulation results are satisfactory. If the changes of discharges are within 20%, the method developed in this paper is effective for valve-motion synthesis in real pipeline systems.展开更多
基金This work was supported in part by the Research Grants Council of the Hong Kong Special Administration Region （No. 412813） and in part by the National Natural Science Foundation of China （No. 611 74049）.
文摘In this paper, we study the output regulation problem of discrete linear time-delay systems by output feedback control. We have established some results parallel to those for the output regulation problem of continuous linear time-delay systems.
文摘通过耦合城市时变增益非线性模型(time variant gain model-urban,TVGM-urban)和暴雨洪水管理模型(storm water management model,SWMM),模拟并分析了不同类型的城市下垫面产流非线性变化过程。以深圳市光明新区海绵城市建设示范区为研究对象,基于耦合的TVGM-SWMM模型,模拟了该地区的降雨-径流响应过程,并进一步分析了不同低影响开发(low impact development,LID)模式布设面积对径流调蓄的影响。结果表明:1)在大多数情况下,TVGM-SWMM模型的模拟效果优于SWMM模型,其原因在于前者考虑了城市地区降雨径流的非线性响应关系,并且强调了降雨强度对产流的影响;同时,TVGM-SWMM模型需要的产流参数较少,减少了对城市地区基础数据资料的需求;2)在不同设计暴雨重现期下,TVGM-SWMM模型模拟的径流过程更加符合降雨变化情况,对应的洪峰流量与最大雨强相关性更高;3)研究区LID设施的径流调蓄能力与其布设面积成正相关,其效果随暴雨重现期的增长相对减弱;相同布设面积情景下,下沉式绿地的调蓄效果优于绿色屋顶。
文摘Territory risk analysis has played an important role in the decision-making of auto insurance rate regulation.Due to the optimality of insurance loss data groupings,clustering methods become the natural choice for such territory risk classification.In this work,spatially constrained clustering is first applied to insurance loss data to form rating territories.The generalized linear model(GLM)and generalized linear mixed model(GLMM)are then proposed to derive the risk relativities of obtained clusters.Each basic rating unit within the same cluster,namely Forward Sortation Area(FSA),takes the same risk relativity value as its cluster.The obtained risk relativities from GLM or GLMM are used to calculate the performance metrics,including RMSE,MAD,and Gini coefficients.The spatially constrained clustering and the risk relativity estimate help obtain a set of territory risk benchmarks used in rate filings to guide the rate regulation process.
文摘A novel non-linear stochastic method based on a Mixed-Integer Linear Programming(MILP)optimization model is proposed to optimally manage a high number of photovoltaic(PV)-battery systems for the provision of up and down regulation in the ancillary services market.This method,considers both the technical constraints of the power system,and those of the equipment used by all the prosumers.This allows an aggregator of many residential prosumers endowed with photovoltaic(PV)-battery systems to evaluate the baseline of the aggregate by minimizing the costs related to the electrical energy absorbed from the grid and then to assess the up and down flexibility curves with relative offer prices.As confirmed by simulation results carried out considering different realistic case studies,the method can effectively be used by an aggregator to evaluate the economic impact of its participation in the ancillary services market,both for the aggregator and for its prosumers.
文摘An automatic control technique for the flow regulation in pipeline systems is developed in the paper. The improvement for the previous work is the use of an optimal observer that reduces greatly the time of changing now states and the adaptability for the regulation of frictioness now. By first order Taylor-expanding the frictioness flow equations of motion and continuity at equilibrium states, a set of linear equations are obtained then, the linear quadratic design technique in automatic control theory is used to control the now states. In order to avoid measuring all states, an optimal state estimator is constructed. A pipeline system is taken as example. The regulation results are satisfactory. If the changes of discharges are within 20%, the method developed in this paper is effective for valve-motion synthesis in real pipeline systems.
