Denmark’ goal of being independent of fossil energy sources in 2050 puts forward great demands on all energy subsystems (electricity, heat, gas and transport, etc.) to be operated in a holistic manner. The Danish exp...Denmark’ goal of being independent of fossil energy sources in 2050 puts forward great demands on all energy subsystems (electricity, heat, gas and transport, etc.) to be operated in a holistic manner. The Danish experience and challenges of wind power integration and the development of district heating systems are summarized in this paper. How to optimally use the cross-sectoral flexibility by intelligent control (model predictive control-based) of the key coupling components in an integrated heat and power system including electrical heat pumps in the demand side, and thermal storage applications in buildings is investigated.展开更多
As more and more distributed renewable energy resources connected to electric power grids,the conventional power system evolves into an integrated energy grid(IEG)in order to satisfy various types of energy demands.Th...As more and more distributed renewable energy resources connected to electric power grids,the conventional power system evolves into an integrated energy grid(IEG)in order to satisfy various types of energy demands.This paper proposes a model of the coordinated scheduling of energy resources(CSoERs)for distributed district heating and cooling systems(DHCs)in an IEG.The model takes into consideration both the dispatchable grid-connected generators and distributed renewable energy resources,such as wind energy,solar energy and natural gas.The objective is to minimize the operation costs in the IEG in order to satisfy not only the electrical loads but also the heating loads and cooling loads.Furthermore,an energy storage system for heating loads and cooling loads is also developed in the DHCs to improve the operation reliability in the distributed DHCs.Detailed simulation studies are carried out to verify the effectiveness of the CSoERs under two different operation scenarios:grid-connected scenario and stand-alone scenario.Simulation results demonstrate that the performance of the CSoERs contributes to significant energy saving and reliability operation in both grid-connected scenario and standalone scenario in the IEG.展开更多
The University of Northern British Columbia(UNBC)has implemented two bioenergy heating projects to demonstrate renewable energy and carry out research on sustainable resource usage.These projects are of particular int...The University of Northern British Columbia(UNBC)has implemented two bioenergy heating projects to demonstrate renewable energy and carry out research on sustainable resource usage.These projects are of particular interest to remote communities and further the institution’s aim to be Canada’s Green University™.The wood pellet system is a template for a community building heating system,while the gasification system is sufficient to supply a community scale district energy system.Both projects demonstrate that bioenergy can be implemented at an institutional level,low levels of particulate emissions are achievable,and that integrating campus operations with research provides relevant demonstration of leading-edge technology.展开更多
面向基于冷热电联供系统和热网构建的多区域综合能源系统(integrated energy system,IES),该文提出计及热网蓄热特性的多区域IES多元储能规划方法。首先,基于能量守恒方程推导热网蓄热模型,以量化热网的缓冲能力;在此基础上,以年综合成...面向基于冷热电联供系统和热网构建的多区域综合能源系统(integrated energy system,IES),该文提出计及热网蓄热特性的多区域IES多元储能规划方法。首先,基于能量守恒方程推导热网蓄热模型,以量化热网的缓冲能力;在此基础上,以年综合成本最小为目标,建立计及热网蓄热特性的多区域IES多元储能规划模型;然后,针对区域互联热网管道流量变化导致模型非凸的问题,利用凸包方法将模型转凸,并设计自适应求解策略,提出凸包自适应优化算法以实现模型的有效求解。最后,天津某实际多区域IES的规划仿真和分析验证了该文所提模型和算法的有效性。展开更多
含多能源站的区域综合能源系统(district integrated energy system,DIES)具有多层级、多运营主体的特征,难以采用传统的集中式方法优化调度。为保证不同运营主体的利益与隐私,该文提出了一种考虑阶梯型碳交易机制的区域电-热综合能源...含多能源站的区域综合能源系统(district integrated energy system,DIES)具有多层级、多运营主体的特征,难以采用传统的集中式方法优化调度。为保证不同运营主体的利益与隐私,该文提出了一种考虑阶梯型碳交易机制的区域电-热综合能源系统分布协同调度方法。首先分析运营主体特性,构建计及热网动态特性和站间互济的综合能源系统模型。在此基础上,构建综合能源系统双层优化调度模型:在系统调度层中,以运营商的经济性和低碳性为目标;在站间调度层中,能源站根据系统调度层的优化结果,调整自身调度策略以实现利益最大化。最后,采用目标级联分析算法(analysis target cascade,ATC)实现交互变量的解耦,并提出了层内迭代、层间互联的求解方法。仿真结果表明,所提调度方法可提高系统运行的低碳经济水平,并通过分布优化兼顾各主体的利益诉求,更满足实际调度需求。展开更多
This paper proposes a neural network based feasible region approximation model of a district heating system(DHS),and it is intended to be used for optimal operation of integrated electricity and heating system(IEHS)co...This paper proposes a neural network based feasible region approximation model of a district heating system(DHS),and it is intended to be used for optimal operation of integrated electricity and heating system(IEHS)considering privacy protection.In this model,a neural network is trained to approximate the feasible region of the DHS operation and then is reformulated as a set of mixed-integer linear constraints.Based on the received approximation models of DHSs and detailed electricity system model,the electricity operator conducts centralized optimization,and then sends specific heating generation plans back to corresponding heating operators.Furthermore,subsequent optimization is formulated for each DHS to obtain detailed operation strategy based on received heating generation plan.In this scheme,optimization of the IEHS could be achieved and privacy protection requirement is satisfied since the feasible region approximation model does not contain detailed system parameters.Case studies conducted on a small-scale system demonstrate accuracy of the proposed strategy and a large-scale system verify its application possibility.展开更多
综合能源系统(integrated energy system,IES)是未来能源消费方式的重要发展方向,实现多区域IES的协同规划与调度对进一步提高其经济效益和环境效益至关重要,为此首要的问题是区域冷、热网的建模。文中基于传热学的基本原理建立了区域...综合能源系统(integrated energy system,IES)是未来能源消费方式的重要发展方向,实现多区域IES的协同规划与调度对进一步提高其经济效益和环境效益至关重要,为此首要的问题是区域冷、热网的建模。文中基于传热学的基本原理建立了区域热网能量传输通用模型,推导出热网热损方程,对其线性化得到热网能量流模型,同时推导了用于求解热网潮流(热媒流量、温度)的网络流量–温度基本方程。在冷热电联供系统运行优化模型基础上建立了含有热网的多区域IES优化混合整数线性规划模型。通过算例验证了模型的有效性。展开更多
以互联互动为特征的区域综合能源系统(district-level integrated energy system,DIES)对建设清洁低碳、安全高效的现代能源体系至关重要。首先,从互联和互动两个维度,分别分析多能流耦合、多系统融合、多区域联合的互联形态和多环节、...以互联互动为特征的区域综合能源系统(district-level integrated energy system,DIES)对建设清洁低碳、安全高效的现代能源体系至关重要。首先,从互联和互动两个维度,分别分析多能流耦合、多系统融合、多区域联合的互联形态和多环节、多主体、多时间尺度的互动机制对DIES的影响;然后,梳理DIES能源站和能源网络建模方法,抽象出能量转换与流动的本质特征;在此基础上,建立考虑互联互动的DIES规划基础模型,对比分析不同场景下能源站规划、能源网络规划和站网联合规划的目标函数与约束条件、不确定性因素处理方式和模型求解方法;最后,对考虑互联互动的DIES规划未来可能的发展方向进行展望。展开更多
基金Danish Agency for Science, Technology and Innovation (No. 6144-00037)Danish InnovationFunding (No. 5185-00005A)
文摘Denmark’ goal of being independent of fossil energy sources in 2050 puts forward great demands on all energy subsystems (electricity, heat, gas and transport, etc.) to be operated in a holistic manner. The Danish experience and challenges of wind power integration and the development of district heating systems are summarized in this paper. How to optimally use the cross-sectoral flexibility by intelligent control (model predictive control-based) of the key coupling components in an integrated heat and power system including electrical heat pumps in the demand side, and thermal storage applications in buildings is investigated.
基金supported by the State Key Program of National Natural Science of China(Grant No.51437006)Guangdong Innovative Research Team Program(No.201001 NO 104744201).
文摘As more and more distributed renewable energy resources connected to electric power grids,the conventional power system evolves into an integrated energy grid(IEG)in order to satisfy various types of energy demands.This paper proposes a model of the coordinated scheduling of energy resources(CSoERs)for distributed district heating and cooling systems(DHCs)in an IEG.The model takes into consideration both the dispatchable grid-connected generators and distributed renewable energy resources,such as wind energy,solar energy and natural gas.The objective is to minimize the operation costs in the IEG in order to satisfy not only the electrical loads but also the heating loads and cooling loads.Furthermore,an energy storage system for heating loads and cooling loads is also developed in the DHCs to improve the operation reliability in the distributed DHCs.Detailed simulation studies are carried out to verify the effectiveness of the CSoERs under two different operation scenarios:grid-connected scenario and stand-alone scenario.Simulation results demonstrate that the performance of the CSoERs contributes to significant energy saving and reliability operation in both grid-connected scenario and standalone scenario in the IEG.
文摘The University of Northern British Columbia(UNBC)has implemented two bioenergy heating projects to demonstrate renewable energy and carry out research on sustainable resource usage.These projects are of particular interest to remote communities and further the institution’s aim to be Canada’s Green University™.The wood pellet system is a template for a community building heating system,while the gasification system is sufficient to supply a community scale district energy system.Both projects demonstrate that bioenergy can be implemented at an institutional level,low levels of particulate emissions are achievable,and that integrating campus operations with research provides relevant demonstration of leading-edge technology.
文摘面向基于冷热电联供系统和热网构建的多区域综合能源系统(integrated energy system,IES),该文提出计及热网蓄热特性的多区域IES多元储能规划方法。首先,基于能量守恒方程推导热网蓄热模型,以量化热网的缓冲能力;在此基础上,以年综合成本最小为目标,建立计及热网蓄热特性的多区域IES多元储能规划模型;然后,针对区域互联热网管道流量变化导致模型非凸的问题,利用凸包方法将模型转凸,并设计自适应求解策略,提出凸包自适应优化算法以实现模型的有效求解。最后,天津某实际多区域IES的规划仿真和分析验证了该文所提模型和算法的有效性。
基金financially supported by China Scholarship Council(CSC)(No.201804910516 and No.202106070041)。
文摘This paper proposes a neural network based feasible region approximation model of a district heating system(DHS),and it is intended to be used for optimal operation of integrated electricity and heating system(IEHS)considering privacy protection.In this model,a neural network is trained to approximate the feasible region of the DHS operation and then is reformulated as a set of mixed-integer linear constraints.Based on the received approximation models of DHSs and detailed electricity system model,the electricity operator conducts centralized optimization,and then sends specific heating generation plans back to corresponding heating operators.Furthermore,subsequent optimization is formulated for each DHS to obtain detailed operation strategy based on received heating generation plan.In this scheme,optimization of the IEHS could be achieved and privacy protection requirement is satisfied since the feasible region approximation model does not contain detailed system parameters.Case studies conducted on a small-scale system demonstrate accuracy of the proposed strategy and a large-scale system verify its application possibility.
文摘综合能源系统(integrated energy system,IES)是未来能源消费方式的重要发展方向,实现多区域IES的协同规划与调度对进一步提高其经济效益和环境效益至关重要,为此首要的问题是区域冷、热网的建模。文中基于传热学的基本原理建立了区域热网能量传输通用模型,推导出热网热损方程,对其线性化得到热网能量流模型,同时推导了用于求解热网潮流(热媒流量、温度)的网络流量–温度基本方程。在冷热电联供系统运行优化模型基础上建立了含有热网的多区域IES优化混合整数线性规划模型。通过算例验证了模型的有效性。
文摘以互联互动为特征的区域综合能源系统(district-level integrated energy system,DIES)对建设清洁低碳、安全高效的现代能源体系至关重要。首先,从互联和互动两个维度,分别分析多能流耦合、多系统融合、多区域联合的互联形态和多环节、多主体、多时间尺度的互动机制对DIES的影响;然后,梳理DIES能源站和能源网络建模方法,抽象出能量转换与流动的本质特征;在此基础上,建立考虑互联互动的DIES规划基础模型,对比分析不同场景下能源站规划、能源网络规划和站网联合规划的目标函数与约束条件、不确定性因素处理方式和模型求解方法;最后,对考虑互联互动的DIES规划未来可能的发展方向进行展望。