共查询到18条相似文献,搜索用时 93 毫秒
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黄容生 《电网与水力发电进展》2020,36(9):63-67
针对传统主动配电网LTE通信安全研究方法忽略了统计通信信号频率,导致研究结果存在精准度较低,配电网通信安全度不够理想的问题,提出基于同步相量测量装置的主动配电网LTE通信安全研究。利用GPS系统秒脉冲作为同步时钟测量单元,以同步相量测量为基本原理,标记测量的CPU,并统计当前交流信号频率。在PMU电源管理单元中,采用128位的加密算法,通过加解密流程,实现主动配电网LTE安全通信研究。实验结果表明,所提方法的精准度更高、安全性更好,能够为保障通信安全提供可靠依据。 相似文献
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目的 中压配电网线损是衡量电网企业经济效益的一项重要指标。目前,由于部分地区,数据采集无法实现同步,线路拓扑关系无法实时更新等原因。导致电网企业在计算线损时存在较大的管理线损。利用配电网同步相量测量终端搭配配电网线损实时分析平台进行线损管理,是解决线损异常问题的有效途径。 方法 首先分析了中压配电网线路线损问题的异常要因,提出了提高线损精准度的思路。然后介绍了同步相量测量技术,提出同步相量测量架构,最后提出了线损实时同步分析平台的功能需求。 结果 基于广州某地区示范工程电网作为研究基础,根据该电网的实际情况和需求,提出基于同步相量测量的中压配电网线损实时同步分析设计方案。 结论 研究方案为配电网线损管理和治理提供了有效方向和工程经验。 相似文献
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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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针对光伏、风电与负荷的协同运行问题,文章提出了自适应扩散算法的分布式协同优化运行策略,该策略通过在自适应扩散算法中构造自适应邻接矩阵和融合矩阵,作为加权因子对节点状态值进行迭代更新,获得全网用户一致检测信息,实现分布式电源功率等边际成本控制。文章采用所提出的策略进行主动配电网有功功率的优化调度,实现源荷间的协调运行。仿真分析表明,自适应扩散算法能够有效解决分布式网络节点信息的实时检测问题,并具有快速学习和适应环境变化的能力。最后以IEEE-14节点配电系统为例进行仿真分析,验证了算法的有效性和可行性。 相似文献
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Dong Liu Jianhua Yan Kefa Cen 《International Journal of Heat and Mass Transfer》2012,55(5-6):1553-1560
The choice of the regularization parameter plays a very important role in the inverse radiation problem of temperature distribution in participating medium and in practice the regularization parameter is not easy to determine accurately, which can directly affect the reconstruction accuracy and introduce errors into reconstruction results. This paper presents the alleviation of non-optimal regularization parameter influence on the temperature distribution reconstruction accuracy in participating medium using coupled methods, i.e., two kinds of regularization method (least square QR decomposition (LSQR) method and truncated singular value decomposition (TSVD) method) coupled with genetic algorithm (GA). The radiative heat transfer was described by the backward Monte Carlo method for its efficiency. Two kinds of temperature distributions with one peak and two peaks are considered. The results show that GA can still improve the accuracy of solutions even though the optimal regularization parameters are used in the coupled methods (LSQR-GA and TSVD-GA). GA can also reduce the temperature reconstruction errors due to the non-optimal choice of the regularization parameter and improve the accuracy of the reconstruction results in the coupled methods. Moreover, the coupled methods can even reach the same or better solutions accuracy for some samples with non-optimal regularization parameter, compared with the accuracy of solutions obtained by the single LSQR method or TSVD method with the optimal regularization parameter. This study demonstrates that the coupled method can alleviate non-optimal regularization parameter influence and obtain more accurate results for the inverse radiation problem of temperature distribution in participating medium. 相似文献
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Protective systems in electricity delivery networks have a major role to play in the increasing of renewable energy systems, and a broad understanding of their current a future application can aid into better taking them into account for achieving future energy networks that adapt for the incorporation of renewable energy generation sources. This paper provides a survey in the state of the art of protective relaying technology and its associated communications technology used in today's power transmission systems. The paper also provides the fundamental knowledge concerned with power system relaying communications. The unifying theme of this paper is to highlight that the future potential of these devices lies in realizing the possibility of going beyond their traditional application as stand-alone equipments with the single role of acting “the last line of defense” so that they can be handled with the increment of renewable energy power delivery systems in near future. 相似文献
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供配电系统通常接有并联补偿电容器,配电网中的高次谐波对电容的影响很大。本文从理论上分析了串联谐振和并联谐振引起的电容器过电流,阐述了无论哪类谐波源,只要参数配合适当,都可能出现电流放大现象或谐波谐振,使电容器过负荷,甚至损坏。并由此找出相应的抑制措施。 相似文献
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张周柱 《电网与水力发电进展》2001,17(3):45-48
介绍了洛河渡槽安全监测基准网和变形点测量的精度设计分析、布设和建造、观测方法及数据处理分析,对观测的结果进行精度分析,所选定的观测方案论证其可行性及经济性,并提出了个人的一些体会. 相似文献
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Xiao-Dong Wang Hong-Jian Lei Jing-Liang Dong Ji-yuan Tu 《International Journal of Heat and Mass Transfer》2012,55(17-18):4682-4687
A wet steam model for transonic flow was proposed to investigate the flow behaviours in a steam-jet pump. Contrary to the general ideal gas assumption adopted by the most of the researches focusing on steam-jet pump investigation, the numerical simulation using this wet steam model that was implemented based on a commercial computational fluid dynamics code, and the simulation results demonstrated the existence of the spontaneous condensation as the supersonic flow passing through the nozzle. Our results also gave good agreement with the referenced experimental data, and with higher accuracy when comparing with the results generated from ideal gas modelling. The present study confirms that the simulation accuracy can be improved by the wet steam modelling, and gives a proper prediction of pump operating status. 相似文献