共查询到19条相似文献,搜索用时 86 毫秒
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分布式电源的接入会对主动配电网系统网损以及其运行经济性造成一定的影响。文章在传统最优潮流(Optimal Power Flow,OPF)模型的基础上,提出了基于敏感性分析(Sensitivity Analysis,SA)算法的主动配电网系统网损优化模型及其求解流程,并在华北地区某34节点配电网系统中对上述模型进行了仿真验证。算例结果表明,在一定的优化误差内,SA算法较传统OPF优化过程具有更高的计算效率,风电出力的不确定性会对系统网损及其最佳接入位置的选择产生较大的影响。 相似文献
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针对主动配电网新能源接入时对故障自愈稳定性和节能优化运行的多重要求,文章提出一种粒子群"破环"的优化算法,以实现故障自愈过程中新能源接入承载力与线损协同的优化方案.首先给出配电网自愈重构的约束条件和优化目标函数,采用FIoyd算法搜寻配电网的最小环结构,并采用一种改进的"破环"粒子群优化算法对故障自愈重构进行优化.最后... 相似文献
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针对当前集中控制方法不能适应配电网不同应用配置工况、就地控制难以协调发挥设备及光伏无功电压调节性能的问题,提出一种主动配电网集中/就地自适应无功电压协调控制方法,根据配网控制条件将设备及光伏的控制模式划分为就地趋优控制和集中优化控制两部分。在就地趋优控制方面,建立协同功率因数和动态趋优因子指标,兼顾全局需求调节光伏与设备无功出力;在集中优化控制方面,根据无功充裕程度选择电压越限风险或网损最小为目标,进行无功优化:通过实际配电网算例仿真验证所提策略的有效性。结果表明该方法可以主动适应配电网控制条件不健全的情况,在优化无功出力、改善线损和电压水平等方面具有优越性。 相似文献
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随着我国城市配电网智能化建设的逐步推进,分布式电源、柔性负荷、储能装置等新能源大规模接入城市配电网,导致城市配电网结构复杂程度加深、调度难度加大,因此十分有必要对主动配电网的调度策略进行优化,降低主动配电网的运行成本,提高分布式能源的消纳能力,降低主动配电网的运行损耗,提高运行效率。本文提出的控制策略以主动配电网的运行成本最小为目的,构建主动配电网调度优化模型,通过动态群搜索算法实现最优解的寻取。以IEEE33节点系统作为研究对象进行仿真分析,结果表明,本文所提出的调度优化策略完全能够提高新能源的本地消纳能力,实现主动配电网的高效运行。 相似文献
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配电网状态估计的目的是根据获取的配电网的各种量测信息,估计配电网系统的运行状态,是配电管理系统(DMS)的重要核心功能之一。根据配电网特点,以电压幅值和相角为状态变量,以量测值和估计值误差最小为目标函数,以潮流方程和估计值的上、下限为约束条件,构建配电网状态估计的优化模型,采用果蝇优化算法对该模型进行求解。算例表明,基于视觉和嗅觉的觅食行为启发的果蝇优化算法可有效求解该优化模型,具有易于实现、控制参数少和计算精度高的特点,为配电网状态估计提供了新的途径。 相似文献
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随着智能电网的不断发展,分布式电源逐步接入主动配电网运行,十分有必要对分布式电源进行合理规划,以保证主动配电网的运行安全性和经济性。本文基于全局优化控制策略和主动配电网独立运行多电源协调控制策略的角度,提出分布式电源双层优化模型。上层模型以主动配电网独立运行安全性指标为约束条件,以运营成本净值最小为规划目标;下层模型根据上层模型的规划结果,基于全局优化控制策略对发电单元的输出进行科学控制,来模拟主动配电网的经济运行工况;并对模型进行最优解寻取运算。通过算例分析验证本文所提出双层优化模型的有效性和科学性。 相似文献
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多微电网互联结构可实现多个微电网间的能量协调,并形成能源互补优势。文章针对多微电网中各分布式电源在天气变化影响下产生的出力不确定性问题,以提高微电网互联系统电压稳定性为目标,研究基于微电网互联结构的微电网间功率协调控制方法。研究单个微电网内分布式电源出力波动特性及其与微电网互联系统、配电网系统之间的能量协调与功率支撑需求特性,建立基于功率平衡控制的微电网间互联控制策略;研究微电网互联系统内各微电网控制系统平衡计算,建立微电网互联系统与配电网间能量交换的控制模型与控制策略。以三机九节点拓扑模型建立微电网互联系统及接入网协调控制模型和算法进行验证,仿真结果表明,文章所提出的微电网协调优化控制方法能够有效减小微电网波动以及对配电网的影响。 相似文献
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分布式控制以其鲁棒性强、可扩展性强等突出优势,已逐渐取代集中式控制,成为高渗透率配电网优化控制的一种有效途径。文章研究了一种基于无功补偿设备和分布式电源分组协作机制的配电网分布式优化控制策略,将多个无功补偿设备或分布式电源聚合在一起,以基于领导者的一致性协议控制节点电压和交换功率。文章给出了分布式协同控制框架,各分组控制目标及一致性变量的选取,并证明了各控制组分布式控制算法的收敛性。通过IEEE14节点系统的仿真算例验证了所提出方法的正确性和有效性。 相似文献
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《International Journal of Hydrogen Energy》2023,48(35):13294-13307
Proton exchange membrane fuel cell (PEMFC) is one of the most promising power energy sources in the world, and its mechanism research has become the main starting point to improve the comprehensive performance of fuel cells. The gas diffusion layer (GDL) of a proton exchange membrane fuel cell has a significant impact on the overall performance of the cell as an important component in supporting the catalytic layer, collecting the current, conducting the gas and discharging the reaction product water. In this paper, a three-dimensional two-phase isothermal fuel cell model is established based on COMSOL, the gradient porosity of the GDL, thickness of the GDL, operating voltage and working pressure of proton exchange membrane fuel cell are analyzed, the consistency problem of fuel cell performance improvement and life extension that is easily overlooked in numerous studies is found. On this basis, a neural network proxy model is constructed through a large amount of data, and a multi-objective genetic optimization algorithm based on the compromise strategy of recombination optimization is proposed to optimize the uniformity of fuel cell power and oxygen molar concentration distribution, which improves the performance of the fuel cell by 1.45% compared with the power increase when it is not optimized. At the same time, the uniformity of oxygen distribution is improved 10.28%, which makes the oxygen distribution more uniform, prolongs the life of the fuel cell, and fills the gap in the optimization direction of the comprehensive performance of the fuel cell. 相似文献
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Donghyeon Lee Yujin Cheon Jun-Hyung Ryu In-Beum Lee 《International Journal of Hydrogen Energy》2017,42(40):25518-25530
Molten Carbonate Fuel Cell (MCFC) has been emerging as a promising renewable power system. It is still challenging to operate the MCFC to meet its varying demands because of its nonlinearity and complex dynamics. This paper proposes a novel MCFC operation framework based on PID auto-tuning control. A case study is presented to illustrate the applicability of the strategy with some comments. 相似文献
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《可再生能源》2017,(1)
分布式可再生能源在主动配电网中的渗透率逐年增加,主动配电网的分布式特性日益凸显;传统的集中能量调度难以解决分布式能源出力随机性的协调以及大量分布式数据的通讯压力。文章以分层多代理模型为控制结构,提出一种基于价格引导的分布式可再生能源协调策略。详细介绍了各Agent的协调模型,区域目标、价格的协调响应策略及区域安全约束条件,利用Agent的分布自治、全局协作实现主动配电网的能量平衡同时促进分布式可再生能源的消纳;协调策略关注电价调整对储能、柔性负荷响应能力的影响,以提高分布式可再生能源消纳。最后,通过指标量化分析策略的综合性能,对比传统时序模拟方法的评估结果,验证了所提方法的合理性、有效性。 相似文献
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Xiaoou Liu 《国际能源研究杂志》2020,44(6):4888-4909
In the energy station and distribution network collaborative planning of integrated energy system (IES), it is difficult to consider station and network interaction in IES operation at the same time. For resolving this problem, the model and solution of planning and operation alternative optimization are proposed considering multiagent interest balance. First, the three-stage optimization framework and model of station and network planning of IES are proposed based on the operation scheduling of IES and the response of energy station and users as different subjects, aiming at optimization of station and network cost-effectiveness, respectively. Second, the distribution network simplification method is proposed based on topological equivalence principle. The topological structure characteristics of distribution network is analyzed, the rapid generation strategy of single tie line network based on broken circle method is proposed, and then an encoding/decoding scheme is proposed based on particle swarm optimization algorithm. Third, considering the load characteristics and energy station demand response based on flexible comfort level of users, a dynamic spot price optimization method and operation strategy of IES are proposed. And then the station and network collaborative planning solution is presented based on the operation optimization of IES. Finally, an example is given to verify the practicability and effectiveness of the proposed method in this paper. 相似文献