January 15-17,2018,Shanghai,China Big data and smart computing are emerging research fields that have recently drawn much attention from computer science and information technology as well as from social sciences and ...January 15-17,2018,Shanghai,China Big data and smart computing are emerging research fields that have recently drawn much attention from computer science and information technology as well as from social sciences and other disciplines.The goal of the IEEE International Conference on Big Data and Smart Computing(BigC omp),initiated by KIISE(Korean Institute of Information展开更多
In the present scenario,many solar photovoltaic(SPV)systems have been installed in the distribution network,most of them are operating at the unity power factor,which does not provide any reactive power support.In fut...In the present scenario,many solar photovoltaic(SPV)systems have been installed in the distribution network,most of them are operating at the unity power factor,which does not provide any reactive power support.In future distribution grids,there will be significant advances in operating strategies of SPV systems with the introduction of smart inverter functions.The new IEEE Std.1547-2018 incorporates dynamic Volt/VAr control(VVC)for smart inverters.These smart inverters can inject or absorb reactive power and maintain voltages at points of common coupling(PCCs)based on local voltage measurements.With multiple inverter-interfaced SPV systems connected to the grid,it becomes a necessary task to develop local,distributed or hybrid VVC algorithms for maximization of energy savings.This paper aims to estimate substation energy savings through centralized and decentralized control of inverters of SPV system alongside various VVC devices.Control strategies of each SPV inverter have been accomplished in compliance with IEEE Std.1547-2018.Time-series simulations are carried out on the modified IEEE-123 node test system.By utilizing smart inverters in traditional SPV systems,considerable energy savings can be obtained.These savings can be further increased by incorporating optimal intelligent VVC characteristics(IVVCC).Results show that just by allowing smart inverters on a predefined IVVCC(as per IEEE Std.1547-2018),a reduction of 11.69%in reactive demand and 5.63%in active demand have been acquired when compared with a conventional SPV system.Reactive energy demand is additionally reduced to 48.42%by considering centralized control of VVC devices alongside optimal IVVCC.展开更多
POE(Power over Ethernet)技术是一种能在以太网上同时传输数据信号和直流电源的方法,其可为百米之内接入交换机的AP(Access Point)设备提供电源,促进了AP设备在智慧城市建设中应用。本文针对复杂的电磁环境,大功率受电设备应用场景,根...POE(Power over Ethernet)技术是一种能在以太网上同时传输数据信号和直流电源的方法,其可为百米之内接入交换机的AP(Access Point)设备提供电源,促进了AP设备在智慧城市建设中应用。本文针对复杂的电磁环境,大功率受电设备应用场景,根据IEEE802.3bt-2018标准探讨大功率POE以太网交换机的应用及设计,此设计主要针对高功率AP设备进行供电,可有效简化大功率AP设备时的布线与安装难度,增加高功率AP设备部署的灵活性。展开更多
文摘January 15-17,2018,Shanghai,China Big data and smart computing are emerging research fields that have recently drawn much attention from computer science and information technology as well as from social sciences and other disciplines.The goal of the IEEE International Conference on Big Data and Smart Computing(BigC omp),initiated by KIISE(Korean Institute of Information
文摘In the present scenario,many solar photovoltaic(SPV)systems have been installed in the distribution network,most of them are operating at the unity power factor,which does not provide any reactive power support.In future distribution grids,there will be significant advances in operating strategies of SPV systems with the introduction of smart inverter functions.The new IEEE Std.1547-2018 incorporates dynamic Volt/VAr control(VVC)for smart inverters.These smart inverters can inject or absorb reactive power and maintain voltages at points of common coupling(PCCs)based on local voltage measurements.With multiple inverter-interfaced SPV systems connected to the grid,it becomes a necessary task to develop local,distributed or hybrid VVC algorithms for maximization of energy savings.This paper aims to estimate substation energy savings through centralized and decentralized control of inverters of SPV system alongside various VVC devices.Control strategies of each SPV inverter have been accomplished in compliance with IEEE Std.1547-2018.Time-series simulations are carried out on the modified IEEE-123 node test system.By utilizing smart inverters in traditional SPV systems,considerable energy savings can be obtained.These savings can be further increased by incorporating optimal intelligent VVC characteristics(IVVCC).Results show that just by allowing smart inverters on a predefined IVVCC(as per IEEE Std.1547-2018),a reduction of 11.69%in reactive demand and 5.63%in active demand have been acquired when compared with a conventional SPV system.Reactive energy demand is additionally reduced to 48.42%by considering centralized control of VVC devices alongside optimal IVVCC.
文摘POE(Power over Ethernet)技术是一种能在以太网上同时传输数据信号和直流电源的方法,其可为百米之内接入交换机的AP(Access Point)设备提供电源,促进了AP设备在智慧城市建设中应用。本文针对复杂的电磁环境,大功率受电设备应用场景,根据IEEE802.3bt-2018标准探讨大功率POE以太网交换机的应用及设计,此设计主要针对高功率AP设备进行供电,可有效简化大功率AP设备时的布线与安装难度,增加高功率AP设备部署的灵活性。
