This paper proposes a hybrid multi-objective optimization and game-theoretic approach(HMOGTA)to achieve the optimal operation of integrated energy systems(IESs)consisting of electricity and natural gas(E&G)utility...This paper proposes a hybrid multi-objective optimization and game-theoretic approach(HMOGTA)to achieve the optimal operation of integrated energy systems(IESs)consisting of electricity and natural gas(E&G)utility networks,multiple distributed energy stations(DESs),and multiple energy users(EUs).The HMOGTA aims to solve the coordinated operation strategy of the electricity and natural gas networks considering the demand characteristics of DESs and EUs.In the HMOGTA,a hierarchical Stackelberg game model is developed for generating equilibrium strategies of DESs and EUs in each district energy network(DEN).Based on the game results,we obtain the coupling demand constraints of electricity and natural gas(CDCENs)which reflect the relationship between the amounts and prices of electricity and cooling(E&C)that DESs purchase from utility networks.Furthermore,the minimization of conflicting costs of E&G networks considering the CDCENs are solved by a multi-objective optimization method.A case study is conducted on a test IES composed of a 20-node natural gas network,a modified IEEE 30-bus system,and 3 DENs,which verifies the effectiveness of the proposed HMOGTA to realize fair treatment for all participants in the IES.展开更多
电网和天然气网通过双向耦合可实现高可靠性运行。为解决电-气耦合的能源互联网故障自愈问题,提出了一种能源互联网自愈及优化运行方法。首先,该方法基于电-气耦合特性,充分利用天然气网对电网的能量补充,在考虑天然气网经济性和新能源...电网和天然气网通过双向耦合可实现高可靠性运行。为解决电-气耦合的能源互联网故障自愈问题,提出了一种能源互联网自愈及优化运行方法。首先,该方法基于电-气耦合特性,充分利用天然气网对电网的能量补充,在考虑天然气网经济性和新能源出力不确定性的基础上,建立双层优化模型,实现综合能源系统的故障快速自愈及优化运行。上层模型利用基于广度优先搜索法的改进蚁群算法,优化供电恢复路径,得到系统开关状态。下层模型基于电-气耦合特性分析,以天然气网经济性为主要目标,采用条件风险价值理论(conditional value at risk,CVaR),同时考虑新能源出力不确定性带来的运行风险,构建电-气耦合的能源互联网优化重构模型。然后,对双层优化模型进行求解并进行全局优化,得到电-气互联型能量调度最优的故障恢复和优化运行方案。最后,通过IEEE33节点配电网和7节点天然气网耦合的能源互联网仿真模型,验证了所提方法的有效性。展开更多
In view of the disadvantages of the traditional energy supply systems,such as separate planning,separate design,independent operating mode,and the increasingly prominent nonlinear coupling between various subsystems,t...In view of the disadvantages of the traditional energy supply systems,such as separate planning,separate design,independent operating mode,and the increasingly prominent nonlinear coupling between various subsystems,the production,transmission,storage and corn sumption of multiple energy sources are coordinated and optimized by the integrated energy system,which improves energy and infrastructure utilization,promotes renewable energy consumption,and ensures reliability of energy supply.In this paper,the mathematical model of the electricity-gas interconnected integrated energy system and its state estimation method are studied.First,considering the nonlinearity between measurement equations and state variables,a performance simulation model is proposed.Then,the state consistency equations and constraints of the coupling nodes for multiple energy sub-systems are established,and constraints are relaxed into the objective function to decouple the integrated energy system.Finally,a distributed state estimation framework is formed by combining the synchronous alternating direction multiplier method to achieve an efficient estimation of the state of the integrated energy system.A simulation model of an electricity-gas interconnected integrated energy system verifies the efficiency and accuracy of the state estimation method proposed in this pape.The results show that the average relative errors of voltage amplitude and node pressure estimated by the proposed distributed state estimation method are only 0.0132%and 0.0864%,much lower than the estimation error by using the Lagrangian relaxation method.Besides,compared with the centralized estimation method,the proposed distributed method saves 5.42 s of computation time.The proposed method is more accurate and efficient in energy allocation and utilization.展开更多
“双碳”背景下,随着碳捕集与封存技术逐步被应用于燃煤机组中,碳捕集-电转气(carbon capture-power to gas,CC-P2G)的耦合特性对电-气互联系统(integrated electricity and gas system,IEGS)安全可靠性的影响不可忽视。为评估该影响,...“双碳”背景下,随着碳捕集与封存技术逐步被应用于燃煤机组中,碳捕集-电转气(carbon capture-power to gas,CC-P2G)的耦合特性对电-气互联系统(integrated electricity and gas system,IEGS)安全可靠性的影响不可忽视。为评估该影响,基于耦合设备变工况精细化模型,提出了考虑CC-P2G耦合特性的IEGS连锁故障评估方法。首先,将电转气过程划分为电解水和甲烷化,并将碳捕集系统中的二氧化碳参与甲烷化,建立CC-P2G变工况精细化模型;同时,考虑详细的气转电过程建立燃气轮机变工况精细化模型。然后,根据电能和天然气流动惯性差异,分别建立基于直流潮流的电力系统连锁故障模型和基于动态潮流的天然气系统连锁故障模型,协同模拟IEGS连锁故障。最后,从拓扑完整性与物理运行特性角度建立评估指标,分别对电力系统与天然气系统受到的连锁故障影响进行量化评估。利用IEEE 39节点系统和29节点天然气系统构建电-气互联测试系统,验证所提方法的有效性。展开更多
基金This work was supported by the State Key Program of National Natural Science Foundation of China(Grant No.51437006)the Natural Science Foundation of Guangdong Province,China(2018A030313799).
文摘This paper proposes a hybrid multi-objective optimization and game-theoretic approach(HMOGTA)to achieve the optimal operation of integrated energy systems(IESs)consisting of electricity and natural gas(E&G)utility networks,multiple distributed energy stations(DESs),and multiple energy users(EUs).The HMOGTA aims to solve the coordinated operation strategy of the electricity and natural gas networks considering the demand characteristics of DESs and EUs.In the HMOGTA,a hierarchical Stackelberg game model is developed for generating equilibrium strategies of DESs and EUs in each district energy network(DEN).Based on the game results,we obtain the coupling demand constraints of electricity and natural gas(CDCENs)which reflect the relationship between the amounts and prices of electricity and cooling(E&C)that DESs purchase from utility networks.Furthermore,the minimization of conflicting costs of E&G networks considering the CDCENs are solved by a multi-objective optimization method.A case study is conducted on a test IES composed of a 20-node natural gas network,a modified IEEE 30-bus system,and 3 DENs,which verifies the effectiveness of the proposed HMOGTA to realize fair treatment for all participants in the IES.
文摘电网和天然气网通过双向耦合可实现高可靠性运行。为解决电-气耦合的能源互联网故障自愈问题,提出了一种能源互联网自愈及优化运行方法。首先,该方法基于电-气耦合特性,充分利用天然气网对电网的能量补充,在考虑天然气网经济性和新能源出力不确定性的基础上,建立双层优化模型,实现综合能源系统的故障快速自愈及优化运行。上层模型利用基于广度优先搜索法的改进蚁群算法,优化供电恢复路径,得到系统开关状态。下层模型基于电-气耦合特性分析,以天然气网经济性为主要目标,采用条件风险价值理论(conditional value at risk,CVaR),同时考虑新能源出力不确定性带来的运行风险,构建电-气耦合的能源互联网优化重构模型。然后,对双层优化模型进行求解并进行全局优化,得到电-气互联型能量调度最优的故障恢复和优化运行方案。最后,通过IEEE33节点配电网和7节点天然气网耦合的能源互联网仿真模型,验证了所提方法的有效性。
基金the National NaturalScience Foundation of China (Grant Nos. 51706132 and 51876116)National Science and Technology Major Project (Nos. 2017-1-0002-0002,and 2017-1-0011-0012).
文摘In view of the disadvantages of the traditional energy supply systems,such as separate planning,separate design,independent operating mode,and the increasingly prominent nonlinear coupling between various subsystems,the production,transmission,storage and corn sumption of multiple energy sources are coordinated and optimized by the integrated energy system,which improves energy and infrastructure utilization,promotes renewable energy consumption,and ensures reliability of energy supply.In this paper,the mathematical model of the electricity-gas interconnected integrated energy system and its state estimation method are studied.First,considering the nonlinearity between measurement equations and state variables,a performance simulation model is proposed.Then,the state consistency equations and constraints of the coupling nodes for multiple energy sub-systems are established,and constraints are relaxed into the objective function to decouple the integrated energy system.Finally,a distributed state estimation framework is formed by combining the synchronous alternating direction multiplier method to achieve an efficient estimation of the state of the integrated energy system.A simulation model of an electricity-gas interconnected integrated energy system verifies the efficiency and accuracy of the state estimation method proposed in this pape.The results show that the average relative errors of voltage amplitude and node pressure estimated by the proposed distributed state estimation method are only 0.0132%and 0.0864%,much lower than the estimation error by using the Lagrangian relaxation method.Besides,compared with the centralized estimation method,the proposed distributed method saves 5.42 s of computation time.The proposed method is more accurate and efficient in energy allocation and utilization.
文摘“双碳”背景下,随着碳捕集与封存技术逐步被应用于燃煤机组中,碳捕集-电转气(carbon capture-power to gas,CC-P2G)的耦合特性对电-气互联系统(integrated electricity and gas system,IEGS)安全可靠性的影响不可忽视。为评估该影响,基于耦合设备变工况精细化模型,提出了考虑CC-P2G耦合特性的IEGS连锁故障评估方法。首先,将电转气过程划分为电解水和甲烷化,并将碳捕集系统中的二氧化碳参与甲烷化,建立CC-P2G变工况精细化模型;同时,考虑详细的气转电过程建立燃气轮机变工况精细化模型。然后,根据电能和天然气流动惯性差异,分别建立基于直流潮流的电力系统连锁故障模型和基于动态潮流的天然气系统连锁故障模型,协同模拟IEGS连锁故障。最后,从拓扑完整性与物理运行特性角度建立评估指标,分别对电力系统与天然气系统受到的连锁故障影响进行量化评估。利用IEEE 39节点系统和29节点天然气系统构建电-气互联测试系统,验证所提方法的有效性。
