To ensure the stable operation of power systems with large proportions of wind power,China has published a series of national,industry,and enterprise standards for wind power.The increase in the number of standards an...To ensure the stable operation of power systems with large proportions of wind power,China has published a series of national,industry,and enterprise standards for wind power.The increase in the number of standards and the expansion of their application scope have given rise to a situation where multiple standards overlap and conflict with regard to the establishment of models and their applicability,resulting in unclear standard application scenarios.Therefore,it is imperative to analyze the development of wind-turbine and wind-farm modeling,along with the relevant standards.This paper presents the methods for wind-turbine modeling,the equivalent model of wind farms based on the general model of wind turbines,and the technical provisions and application scenarios involved in the relevant domestic and international standards.The adaptability of the relevant standards is examined.The results of this study are helpful for advancing wind power generation in China and ensuring the safe and stable operation of large-scale wind power systems.展开更多
Using wind-availability forecasts in day-ahead unit commitment can require expensive real-time operational adjustments.We examine the benefit of conducting interim recommitment between day-ahead unit commitment and re...Using wind-availability forecasts in day-ahead unit commitment can require expensive real-time operational adjustments.We examine the benefit of conducting interim recommitment between day-ahead unit commitment and real-time dispatch.Using a simple stylized example and a case study that is based on ISO New England,we compare system-operation costs with and without interim recommitment.We find an important tradeoff—later recommitment provides better wind-availability forecasts,but the system has less flexibility due to operating constraints.Of the time windows that we examine,hour-20 recommitment provides the greatest operational-cost reduction.展开更多
Power systems are responding to climate change both through efforts to reduce greenhouse-gas emissions and through adaptive responses to the effects of climate change,such as changes in hydroelectric generation.These ...Power systems are responding to climate change both through efforts to reduce greenhouse-gas emissions and through adaptive responses to the effects of climate change,such as changes in hydroelectric generation.These changes,experienced together,may cause new patterns in plant operations or pollutant emissions.Various scenarios representing future climate change mitigation and adaptation in the power sector were explored using the PLEXOS production-cost model,with a focus on plant utilization and behaviour,total system-operating costs and total CO_(2) emissions.Further,the effect of introducing widespread utility-scale energy storage into these scenarios was quantified in terms of these same parameters.Large increases in variable renewable penetration combined with extreme reduction of hydroelectric generation in the American Southwest(based on climate modelling in the Colorado River basin and actual drought experience in California)caused significant increases in thermal plant start-up/shutdown cycling.The introduction of storage significantly reduced this cycling,without a material increase in CO_(2) emissions.Storage introduced on even a modest scale can provide considerable flexibility under a range of future power-system circumstances that might be experienced due to climate change.展开更多
随着分布式发电装置和电力电子设备在低压配电系统的广泛应用,采用直流供电方式的低压系统又显现出优越性,并引起学者的关注。迄今为止,学者们对低压直流系统的系统结构、负荷的兼容性、负荷模型、电能质量与可靠性、保护和控制、节能...随着分布式发电装置和电力电子设备在低压配电系统的广泛应用,采用直流供电方式的低压系统又显现出优越性,并引起学者的关注。迄今为止,学者们对低压直流系统的系统结构、负荷的兼容性、负荷模型、电能质量与可靠性、保护和控制、节能型评估等方面进行的初步研究表明:低压直流供电系统可以兼容目前大部分的低压负荷,可以对暂态过程进行有效的控制,并提高供电的连续性;特别是在具有分布式发电装置(如太阳能电池、风力发电、燃料电池)的低压系统中,低压直流(low voltage direct current,LVDC)供电系统在降低系统电能损耗、增强供电连续性和可靠性、提高电能质量方面,与交流系统相比,具有优越性,并且系统结构得以简化。同时,该文提出并讨论了低压直流系统需要进一步研究的问题。展开更多
基金supported in part by the Joint Research Fund in Smart Grid (U1966208) under a cooperative agreement between the National Natural Science Foundation of China (NSFC) and State Grid Corporation of China (SGCC)
文摘To ensure the stable operation of power systems with large proportions of wind power,China has published a series of national,industry,and enterprise standards for wind power.The increase in the number of standards and the expansion of their application scope have given rise to a situation where multiple standards overlap and conflict with regard to the establishment of models and their applicability,resulting in unclear standard application scenarios.Therefore,it is imperative to analyze the development of wind-turbine and wind-farm modeling,along with the relevant standards.This paper presents the methods for wind-turbine modeling,the equivalent model of wind farms based on the general model of wind turbines,and the technical provisions and application scenarios involved in the relevant domestic and international standards.The adaptability of the relevant standards is examined.The results of this study are helpful for advancing wind power generation in China and ensuring the safe and stable operation of large-scale wind power systems.
基金This work was supported by National Science Foundation(No.1808169)。
文摘Using wind-availability forecasts in day-ahead unit commitment can require expensive real-time operational adjustments.We examine the benefit of conducting interim recommitment between day-ahead unit commitment and real-time dispatch.Using a simple stylized example and a case study that is based on ISO New England,we compare system-operation costs with and without interim recommitment.We find an important tradeoff—later recommitment provides better wind-availability forecasts,but the system has less flexibility due to operating constraints.Of the time windows that we examine,hour-20 recommitment provides the greatest operational-cost reduction.
文摘Power systems are responding to climate change both through efforts to reduce greenhouse-gas emissions and through adaptive responses to the effects of climate change,such as changes in hydroelectric generation.These changes,experienced together,may cause new patterns in plant operations or pollutant emissions.Various scenarios representing future climate change mitigation and adaptation in the power sector were explored using the PLEXOS production-cost model,with a focus on plant utilization and behaviour,total system-operating costs and total CO_(2) emissions.Further,the effect of introducing widespread utility-scale energy storage into these scenarios was quantified in terms of these same parameters.Large increases in variable renewable penetration combined with extreme reduction of hydroelectric generation in the American Southwest(based on climate modelling in the Colorado River basin and actual drought experience in California)caused significant increases in thermal plant start-up/shutdown cycling.The introduction of storage significantly reduced this cycling,without a material increase in CO_(2) emissions.Storage introduced on even a modest scale can provide considerable flexibility under a range of future power-system circumstances that might be experienced due to climate change.
文摘随着分布式发电装置和电力电子设备在低压配电系统的广泛应用,采用直流供电方式的低压系统又显现出优越性,并引起学者的关注。迄今为止,学者们对低压直流系统的系统结构、负荷的兼容性、负荷模型、电能质量与可靠性、保护和控制、节能型评估等方面进行的初步研究表明:低压直流供电系统可以兼容目前大部分的低压负荷,可以对暂态过程进行有效的控制,并提高供电的连续性;特别是在具有分布式发电装置(如太阳能电池、风力发电、燃料电池)的低压系统中,低压直流(low voltage direct current,LVDC)供电系统在降低系统电能损耗、增强供电连续性和可靠性、提高电能质量方面,与交流系统相比,具有优越性,并且系统结构得以简化。同时,该文提出并讨论了低压直流系统需要进一步研究的问题。
