Electric power system is one of the most important and complex engineering in modern society, supplying main and general power for social production and social life. Meanwhile, since it is a productive system with bo...Electric power system is one of the most important and complex engineering in modern society, supplying main and general power for social production and social life. Meanwhile, since it is a productive system with both high input and output, it has an obvious economic significance to improve its operating efficiency. For an example, an unit is 10 GW scale, if its standard coal consumption can be decreased with 1 g/kW·h, it can save about 5 000 tons standard coal per year. It will be discussed mainly that how to establish optimization model and its numerical algorithm for operating management of the electric power system. The idea on establishing optimization model is how to dispatch work state of units or power plants, so that total cost of fuel consumption for generation is reduced to the minimum. Here the dispatch is to decide which unit or plant to operate, which unit or plant to stop running, how much power should be generated for those operating units or plants at each given time interval.展开更多
大规模风电并网导致电力系统惯量和一次调频响应资源减少,大扰动下系统频率安全问题突出。为应对风电不确定性和系统惯量降低的挑战,提出计及风电频率支撑能力和运行风险的鲁棒机组组合(unitcommitment,UC)模型。首先,通过系统发生有功...大规模风电并网导致电力系统惯量和一次调频响应资源减少,大扰动下系统频率安全问题突出。为应对风电不确定性和系统惯量降低的挑战,提出计及风电频率支撑能力和运行风险的鲁棒机组组合(unitcommitment,UC)模型。首先,通过系统发生有功扰动后频率偏差动力学摆动方程建立频率安全的运行约束模型,并嵌入到UC问题中。其次,考虑到风电出力不确定性,提出风电出力鲁棒可行域定义以表征系统接纳风电的安全运行范围,并基于此提出系统运行风险模型。最后,基于两阶段鲁棒优化理论提出计及风电频率支撑能力和运行风险的UC鲁棒优化模型,并采用列和约束生成(column and constraint generation,C&CG)算法求解该模型。在IEEE9和IEEE118节点测试系统进行仿真分析,结果验证了所提模型的有效性。展开更多
针对传统输电网和主动配电网(active distribution network,ADN)独立的调度方式致使“源-网-荷”各环节资源协同潜力挖掘不充分,难以实现输-配系统经济高效运行的问题,提出了市场环境下考虑配电网络重构和需求响应的输配优化调度方法。...针对传统输电网和主动配电网(active distribution network,ADN)独立的调度方式致使“源-网-荷”各环节资源协同潜力挖掘不充分,难以实现输-配系统经济高效运行的问题,提出了市场环境下考虑配电网络重构和需求响应的输配优化调度方法。首先,剖析电力市场机制下输-配电网间的耦合机理,构建考虑机组组合的输电网市场出清模型,以发挥“源侧”应对电力负荷波动的能力;以节点边际电价为引导信号,提出同时考虑ADN网络重构和需求侧响应的输配协同双层优化模型,旨在挖掘ADN在“网侧”和“荷侧”的双侧协同潜力,从而提高输-配电网中“源-网-荷”各环节资源间的协同能力。其次,针对输-配模型上、下层级的物理特点,采用随机规划L形算法,引入虚拟变量实现输配协同模型的解耦,基于对偶理论,获取反映资源利用情况的对偶乘子集合,进而计算次梯度参数并生成仿射割集,优化输-配耦合变量,加速模型收敛,实现对输-配协同模型的分布式高效求解。最后,以6节点输电网和7节点配电网构成的T6+D7系统和118节点输电网和8个20节点配电网构成的T118+8*D20系统为例,验证所提模型和方法的有效性,研究结果表明:输配系统的整体经济性提升了8.68%,所提模型和方法具有明显优势。展开更多
在故障发生后的瞬间,电网不同节点上的频率变化率(rate of change of frequency,RoCoF)不尽相同,其分布不仅取决于故障发生的位置,同时也与惯量在整个系统中的分布以及输电线路的拓扑和参数有关。因此,基于系统中心惯量的故障后RoCoF仍...在故障发生后的瞬间,电网不同节点上的频率变化率(rate of change of frequency,RoCoF)不尽相同,其分布不仅取决于故障发生的位置,同时也与惯量在整个系统中的分布以及输电线路的拓扑和参数有关。因此,基于系统中心惯量的故障后RoCoF仍有可能超出安全阈值。为应对这一挑战,提出了考虑惯量-RoCoF空间分布特性的最优机组组合方法。首先,建立惯量-RoCoF空间分布模型,分析故障后电网各节点注入功率与电压相角的变化。然后,构建电网节点RoCoF的安全约束,并将其嵌入到最优机组组合问题中。最后,通过WSCC9节点系统和东南澳电力系统的仿真分析,验证了所提机组组合方案相较于传统方法在维持电网节点RoCoF安全方面的优势。展开更多
文摘Electric power system is one of the most important and complex engineering in modern society, supplying main and general power for social production and social life. Meanwhile, since it is a productive system with both high input and output, it has an obvious economic significance to improve its operating efficiency. For an example, an unit is 10 GW scale, if its standard coal consumption can be decreased with 1 g/kW·h, it can save about 5 000 tons standard coal per year. It will be discussed mainly that how to establish optimization model and its numerical algorithm for operating management of the electric power system. The idea on establishing optimization model is how to dispatch work state of units or power plants, so that total cost of fuel consumption for generation is reduced to the minimum. Here the dispatch is to decide which unit or plant to operate, which unit or plant to stop running, how much power should be generated for those operating units or plants at each given time interval.
文摘大规模风电并网导致电力系统惯量和一次调频响应资源减少,大扰动下系统频率安全问题突出。为应对风电不确定性和系统惯量降低的挑战,提出计及风电频率支撑能力和运行风险的鲁棒机组组合(unitcommitment,UC)模型。首先,通过系统发生有功扰动后频率偏差动力学摆动方程建立频率安全的运行约束模型,并嵌入到UC问题中。其次,考虑到风电出力不确定性,提出风电出力鲁棒可行域定义以表征系统接纳风电的安全运行范围,并基于此提出系统运行风险模型。最后,基于两阶段鲁棒优化理论提出计及风电频率支撑能力和运行风险的UC鲁棒优化模型,并采用列和约束生成(column and constraint generation,C&CG)算法求解该模型。在IEEE9和IEEE118节点测试系统进行仿真分析,结果验证了所提模型的有效性。
文摘针对传统输电网和主动配电网(active distribution network,ADN)独立的调度方式致使“源-网-荷”各环节资源协同潜力挖掘不充分,难以实现输-配系统经济高效运行的问题,提出了市场环境下考虑配电网络重构和需求响应的输配优化调度方法。首先,剖析电力市场机制下输-配电网间的耦合机理,构建考虑机组组合的输电网市场出清模型,以发挥“源侧”应对电力负荷波动的能力;以节点边际电价为引导信号,提出同时考虑ADN网络重构和需求侧响应的输配协同双层优化模型,旨在挖掘ADN在“网侧”和“荷侧”的双侧协同潜力,从而提高输-配电网中“源-网-荷”各环节资源间的协同能力。其次,针对输-配模型上、下层级的物理特点,采用随机规划L形算法,引入虚拟变量实现输配协同模型的解耦,基于对偶理论,获取反映资源利用情况的对偶乘子集合,进而计算次梯度参数并生成仿射割集,优化输-配耦合变量,加速模型收敛,实现对输-配协同模型的分布式高效求解。最后,以6节点输电网和7节点配电网构成的T6+D7系统和118节点输电网和8个20节点配电网构成的T118+8*D20系统为例,验证所提模型和方法的有效性,研究结果表明:输配系统的整体经济性提升了8.68%,所提模型和方法具有明显优势。
文摘在故障发生后的瞬间,电网不同节点上的频率变化率(rate of change of frequency,RoCoF)不尽相同,其分布不仅取决于故障发生的位置,同时也与惯量在整个系统中的分布以及输电线路的拓扑和参数有关。因此,基于系统中心惯量的故障后RoCoF仍有可能超出安全阈值。为应对这一挑战,提出了考虑惯量-RoCoF空间分布特性的最优机组组合方法。首先,建立惯量-RoCoF空间分布模型,分析故障后电网各节点注入功率与电压相角的变化。然后,构建电网节点RoCoF的安全约束,并将其嵌入到最优机组组合问题中。最后,通过WSCC9节点系统和东南澳电力系统的仿真分析,验证了所提机组组合方案相较于传统方法在维持电网节点RoCoF安全方面的优势。
