The growing installation of natural gas fired power plants has increased the integration of natural gas and electricity sectors. This has driven the need investigate the interactions among them and to optimize energy ...The growing installation of natural gas fired power plants has increased the integration of natural gas and electricity sectors. This has driven the need investigate the interactions among them and to optimize energy resources management from a centralized planning perspective. Thus, a combined modeling of the reservoirs involved in electric power and gas systems and their locations on both networks are essential features to be considered in the operational planning of energy resources.This paper presents a modeling and optimization approach to the operational planning of electric power and natural gas systems, taking into account different energy storage facilities, such as water reservoirs, natural gas storages and line packs of pipelines. The proposed model takes advantage of captures both energy systems synergy and their associated networks. This approach identifies the interactions between the energy storage facilities and their economic impact over their optimal scheduling. The results show the benefits of an integrated operational planning of electric power and natural gas systems, the close interdependency between the energy resources stored in both systems, and the effects of a combined scheduling.展开更多
针对多种能源间存在惯性影响差异导致的能源供给与负荷需求无法匹配等问题,从热力系统出发,提出一种考虑热惯性的综合能源系统(integrated energy system,IES)运行优化方法,用以降低系统运行成本及提高运行可靠性。该方法综合考虑供热...针对多种能源间存在惯性影响差异导致的能源供给与负荷需求无法匹配等问题,从热力系统出发,提出一种考虑热惯性的综合能源系统(integrated energy system,IES)运行优化方法,用以降低系统运行成本及提高运行可靠性。该方法综合考虑供热系统的热惯性,首先分析IES典型架构和系统能量转换模型,将IES的能源输送网络作为基础,研究热网管道输送能力的描述参数,建立供热管道的热惯性和蓄热模型;其次,以系统总运行成本最低为目标,结合功率平衡约束和设备运行安全约束等,考虑供热管网热惯性和储热特性,建立相应的IES运行优化模型,并基于遗传算法对模型进行求解;最后,基于优化模型进行算例仿真,仿真结果表明,所提运行优化方法能够在保障设备平稳安全运行的情况下,有效降低系统运行成本,提高系统灵活性。展开更多
Purpose–This study aims to improve the availability of regenerative braking for urban metro vehicles by introducing a sensorless operational temperature estimation method for the braking resistor(BR)onboard the vehic...Purpose–This study aims to improve the availability of regenerative braking for urban metro vehicles by introducing a sensorless operational temperature estimation method for the braking resistor(BR)onboard the vehicle,which overcomes the vulnerability of having conventional temperature sensor.Design/methodology/approach–In this study,the energy model based sensorless estimation method is developed.By analyzing the structure and the convection dissipation process of the BR onboard the vehicle,the energy-based operational temperature model of the BR and its cooling domain is established.By adopting Newton’s law of cooling and the law of conservation of energy,the energy and temperature dynamic of the BR can be stated.To minimize the use of all kinds of sensors(including both thermal and electrical),a novel regenerative braking power calculation method is proposed,which involves only the voltage of DC traction network and the duty cycle of the chopping circuit;both of them are available for the traction control unit(TCU)of the vehicle.By utilizing a real-time iterative calculation and updating the parameter of the energy model,the operational temperature of the BR can be obtained and monitored in a sensorless manner.Findings–In this study,a sensorless estimation/monitoring method of the operational temperature of BR is proposed.The results show that it is possible to utilize the existing electrical sensors that is mandatory for the traction unit’s operation to estimate the operational temperature of BR,instead of adding dedicated thermal sensors.The results also validate the effectiveness of the proposal is acceptable for the engineering practical.Originality/value–The proposal of this study provides novel concepts for the sensorless operational temperature monitoring of BR onboard rolling stocks.The proposed method only involves quasi-global electrical variable and the internal control signal within the TCU.展开更多
基金supported by the Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET)the Agencia Nacional de Promoción Científica y Tecnológica (ANPCYT)
文摘The growing installation of natural gas fired power plants has increased the integration of natural gas and electricity sectors. This has driven the need investigate the interactions among them and to optimize energy resources management from a centralized planning perspective. Thus, a combined modeling of the reservoirs involved in electric power and gas systems and their locations on both networks are essential features to be considered in the operational planning of energy resources.This paper presents a modeling and optimization approach to the operational planning of electric power and natural gas systems, taking into account different energy storage facilities, such as water reservoirs, natural gas storages and line packs of pipelines. The proposed model takes advantage of captures both energy systems synergy and their associated networks. This approach identifies the interactions between the energy storage facilities and their economic impact over their optimal scheduling. The results show the benefits of an integrated operational planning of electric power and natural gas systems, the close interdependency between the energy resources stored in both systems, and the effects of a combined scheduling.
文摘针对多种能源间存在惯性影响差异导致的能源供给与负荷需求无法匹配等问题,从热力系统出发,提出一种考虑热惯性的综合能源系统(integrated energy system,IES)运行优化方法,用以降低系统运行成本及提高运行可靠性。该方法综合考虑供热系统的热惯性,首先分析IES典型架构和系统能量转换模型,将IES的能源输送网络作为基础,研究热网管道输送能力的描述参数,建立供热管道的热惯性和蓄热模型;其次,以系统总运行成本最低为目标,结合功率平衡约束和设备运行安全约束等,考虑供热管网热惯性和储热特性,建立相应的IES运行优化模型,并基于遗传算法对模型进行求解;最后,基于优化模型进行算例仿真,仿真结果表明,所提运行优化方法能够在保障设备平稳安全运行的情况下,有效降低系统运行成本,提高系统灵活性。
基金supported by the Fund of China Academy of Railway Sciences Corporation Limited(2022YJ230)the Scientific Research Projects of China Association of Metros(CAMET-KY-2022039).
文摘Purpose–This study aims to improve the availability of regenerative braking for urban metro vehicles by introducing a sensorless operational temperature estimation method for the braking resistor(BR)onboard the vehicle,which overcomes the vulnerability of having conventional temperature sensor.Design/methodology/approach–In this study,the energy model based sensorless estimation method is developed.By analyzing the structure and the convection dissipation process of the BR onboard the vehicle,the energy-based operational temperature model of the BR and its cooling domain is established.By adopting Newton’s law of cooling and the law of conservation of energy,the energy and temperature dynamic of the BR can be stated.To minimize the use of all kinds of sensors(including both thermal and electrical),a novel regenerative braking power calculation method is proposed,which involves only the voltage of DC traction network and the duty cycle of the chopping circuit;both of them are available for the traction control unit(TCU)of the vehicle.By utilizing a real-time iterative calculation and updating the parameter of the energy model,the operational temperature of the BR can be obtained and monitored in a sensorless manner.Findings–In this study,a sensorless estimation/monitoring method of the operational temperature of BR is proposed.The results show that it is possible to utilize the existing electrical sensors that is mandatory for the traction unit’s operation to estimate the operational temperature of BR,instead of adding dedicated thermal sensors.The results also validate the effectiveness of the proposal is acceptable for the engineering practical.Originality/value–The proposal of this study provides novel concepts for the sensorless operational temperature monitoring of BR onboard rolling stocks.The proposed method only involves quasi-global electrical variable and the internal control signal within the TCU.
