为避免科技成果数据外泄,设计一种基于Portal认证技术的科技成果数据跨平台访问控制方法.采用Portal认证技术构建请求访问平台和科技成果数据服务平台的访问控制模型,当这2个平台通过访客身份认证后,对其进行信任度评估和访问请求授权;服务提供平台利用策略实施点(PEP)完成访问请求用户属性信息的收集并传送至PEP,采用推荐算子计算存在访问请求的用户信任度,并通过合一运算获取用户在科技成果数据服务平台的信任度.将获取的信任度传送至策略决策点(PDP),通过PDP对信任度进行分析,以给出是否对该访问请求进行授权的判定,实现科技成果数据跨平台访问控制.实验结果表明,该方法访问控制的有效性与精准度较高,平台响应时间短,实用性好.

Coal-to-Electricity Projects are being carried on in North China in order to reduce air pollution. These projects have brought many challenges to present electric distribution networks. Therefore, this paper focuses on how the practical electric distribution systems act facing a large quantity of electric heating integration and how to improve the behaviours. Field researches are conducted covering all cities in North Hebei Province. The current problems in planning, operation and investment of the power distribution networks supporting Coal-to-Electricity Projects are founded, and the reasons are analysed. The suggestions on the above three aspects are put forward accordingly. Case study on the distribution system in Xianghe County is conducted, and the effectiveness of the proposed approaches are verified. This study may give reference on Coal-to-Electricity related electric distribution work for other places and for the future, and also guide practical planning, operation and investment of power distribution systems on special issues.

分布式电源合理接入配电网不仅可以充分发挥可再生能源的优势,也可以提高配电网运行的经济性与可靠性.从安全性和经济性的角度,提出一种考虑配电网最大消纳能力的集中型分布式电源并网点选择方法.首先,建立配电网最大消纳能力计算模型,然后,以分布式电源投资成本 、新建线路造价 、线路损耗费用以及停电损失费用的总和最小为目标,以节点电压 、线路载流 、功率平衡 、N-1校验为约束条件提出一种分布式电源并网点的选择方法.以冀北电网某一供电区域为算例,结果表明:在分布式电源规划并网容量确定的前提下,利用该文方案能得到较合理的分布式电源并网点,具有重要的实用价值.

国网冀北电力有限公司肩负着保障首都供电安全、服务冀北地区经济社会发展和服务国家新能源发展的特殊使命.在分析影响负荷变化的外部环境的前提下,使用支持向量机(support vector machine,SVM)和误差反向传播算法(back propaga-tion,BP)神经网络对冀北地区年最大负荷进行建模预测.误差对比分析表明支持向量机的预测精度更高;从预测结果看,冀北地区年最大负荷波动较小,年均增长率为0.78％.预测结果可为冀北地区电力发展提供参考.

This paper mainly studies the operation monitoring data mining technology of Power Grid Company.In order to meet the need of operation monitoring business in the era of big data, this paper deeply studies the data mining technology suitable for company operation monitoring, builds a database of data mining technology and forms a data mining technology subject database according to the different application of company operation monitoring data mining technology to solve the problem of data mining for the operation and monitoring business.The research on the company's operation monitoring data mining technology helps company analyze the laws and trends of operation monitoring business, promote the company's quantitative decision-making and enhance the company's decision-making efficiency.At the same time, this study can reduce duplication of resources, increase the value of data assets, and ultimately improve the lean operation and management of power grid.

随着能源危机与环境污染问题的日趋严重,全球能源互联网理念应运而生,新产生的清洁能源、特高压电网以及智能电网都为能源互联网的深入发展奠定了坚实基础.本文结合全球能源互联网趋势背景,对光伏接入电网的后续影响进行了探讨,并提出几点浅见,希望能够为相关电力企业和部门提供参考性意见.

唐山是典型工业城市,其用电量受大气污染防治政策冲击严重.文章以2014年APEC会议期间唐山用电量及空气质量相关数据为基础,采用数据挖掘方法,对唐山空气质量及其影响因素进行了聚类分析,并挖掘了用电量与空气质量之间的关联规则.研究结果表明,高耗能行业限产停产总体上有利于空气质量的改善,但限产停产措施效果还需取决于气象因素.研究成果可以为京津冀地区应对重污染天气及重大事件期间的空气质量保障计划提供参考依据.

提出了含分布式电源配电网的"源网荷"协调规划体系及其技术路线,从协调性、安全性、经济性三个角度建立了含分布式电源配电网的规划评价指标体系,并给出各个指标具体计算方法.建立的该"源网荷"协调规划体系能够指导未来含分布式电源的配电网规划建设,促进智能电网综合效能的提升.

随着主动式配电网的发展和分布式能源的大量接入,输电网与配电网间的联系日益复杂紧密,在对配电网进行可靠性评估时应充分考虑输电网可靠程度.提出了一种量化输电网可靠程度的输电网等值方法,用以提高配电网可靠性评估的实用性.首先,提出了节点最大负载能力的概念,用以表征输电网向下游配电网的最大供电能力,进而将输电网等值成配电网的电源节点.其次,采用蒙特卡洛模拟法和最优化技术相结合的方法,建立了输电网节点最大负载能力计算评估模型.最后,采用RBTS输电系统进行测试,验证了所提出的输电网可靠性量化等值方法的有效性.

The trend of distributed power application is more and more obvious Aiming at the problem of the lack of effective argument and the corresponding technical analysis in access system. Focus on all kinds of distributed power supply access after the results of the influence of the power grid operation. First of all, from the operation mode and the way of interface for distributed power supply is analyzed, so that the classification to study the effect of different results is easy. Then, analyse the connection way of the distributed power grid, build a typical distribution network model, as the basis of analysis of the distributed power access. Finally, by the theoretical calculation of the access model, analyse the effect on the steady state characteristics and power quality, thus providing theoretical basis for distribution network planning technology principle of modified.

This paper proposes a novel method for distributed generation utilization and Low Voltage (LV) network management with residential energy storage batteries in distribution systems. The batteries installed at end users are actually used for demand response, allowing customers and distributed network operators (DNOs) to reserve part of storage capacity in order to absorb energy from residential photo voltaic (PV) generation and relieve network congestion. The major difficulty in carrying out storage capacity reservations is the quantification of reserved capacity based on not only predicted PV outputs, but also identified network pressures. In order to overcome this difficulty, the algorithm of storage capacity reservation considers both energy and network sides. The reserved storage capacities are basically evaluated following two criteria: energy capacity reserved for cheap energy charging and capacity reservation according to customers' contribution to network pressures. A case study is carried out in a practical network in the UK to implement the proposed method, where the benefits are quantified in terms of energy consumption reduction from grid, energy cost reduction and network cost saving.

It is planned that several ultra-large-scale multi-infeed AC-DC hybrid power systems would be built in China by 2018. In multi-infeed AC-DC hybrid power systems, since AC-DC transmission lines are in parallel operation and the electrical distances between many DC converters are very short, there will be interactions between AC-DC hybrid power systems. And this will bring new challenges to the operating characteristics analysis and stability control strategy of multi-infeed AC-DC hybrid power systems. This paper begins with discussing complicated the interactions between AC-DC systems and the interactions between DC systems in the multi-infeed DC transmission system, and outlining the studies on researches of commutation failure of multi-infeed AC-DC hybrid power system, DC system failure recovery, the power angle / voltage stability problems, and etc. This paper sets up two indicators, namely Multi-infeed Short Circuit Ratio and Multi-infeed Interaction Factor, to measure the interaction extent between the AC power systems and its connected DC power systems. Then, the paper introduces the principle of emergency DC power support and the support strategy of DC power increase and fallback. Next, the paper takes the Jibei Power Grid, which is planned for 2018, as an example, using PSD simulation program to simulate and calculate the stability conditions of Jibei Multi-infeed AC-DC hybrid power system. In the end, the paper proposes the technical solutions for the structure enhancement of AC systems and the additional stability control strategy of DC systems, and etc., according to the simulation results.

The accession of diversification loads containing DG and electric vehicles charging stations into distribution network has an important impact on the distribution network planning and operation. This paper proposes a planning model of rural distribution network containing diversification loads, which can realize the integrated optimization planning including the location and sizing of DG, charging station location and capacity, distributed network frame construction and renovation. Taking the diversification loads into account, and selecting the minimum costs of investment, operation and environment as the objective, the paper establishes the planning model of rural distribution network containing diversification loads. The simulation results show the model can improve the economic and environmental benefits.

钢铁企业电力负荷作为电力负荷的重要组成部分,钢铁电力负荷的准确预测对于提高电力负荷预测精度具有重要意义.为了实现钢铁电力负荷的中长期预测,本文选取了经济因素和社会因素作为自变量,引入带有惯性权重的粒子群算法(WPSO)对传统的最小二乘支持向量机智能预测模型(LSSVM)参数进行优化,并利用某地区钢铁电力负荷样本数据进行验证,拟合结果显示,经过粒子群算法优化后的最小二乘智能向量机算法预测精度更高,收敛速度更快,具有良好的推广性和适应性.

本文通过对某地区单位产值耗电量（简称单耗）历史情况进行统计分析，并结合某地区产业结构调整，找出第一、二、三产业单耗变化的一定规律，预测规划期第一、二、三产业的综合单耗，然后根据国民经济和社会发展变化情况对某地区未来用电量进行预测。

Taking the scheme of reducing loss of Qinhuangdao 220kV long-distance interconnection line for example,the line loss rates of several types of interconnection lines were compared briefly.It was concluded that the operation mode of uncoupling the loop with Tangshan 220 kV electromagnetic loop network was the most advantageous to reducing the line loss rate,which was expected to provide references for the loss reduction scheme of similar long-distance interconnection lines.

Optimal scheduling of cascade hydropower station is a large-scale optimization problem with multi- variables and multi-constraints, so its solving process becomes complicated. In this paper, the authors attempt to solve long-term optimal scheduling of cascade hydropower station by successive linear programming (SLP). By use of first-order linear expansion of Taylor series, the linearization process of both nonlinear constraints and objective function of long-term optimal scheduling model are performed and an optimal scheduling model based on seccessive linear programming is built; an approach to solve Optimal scheduling of cascade hydropower station problem by seccessive linear programming is put forward, the scale-down factor of iteration step length is used to ensure that the algorithm can converge to the optimal solution of optimization problem quickly and accurately. The optimal scheduling program for cascade hydropower station is programmed by Matlab 7.0. Simulation results of two cascade hydropower station show that the proposed method can be applied to solve optimal scheduling of cascade hydropower station and the optimal solution of nonlinear problem can be obtained quickly.

This paper presents a modelling method for elctric energy production of hydroelectric plants and hydro-mechanical-electric coupling of large-scale reservoir. According to the law of conservation of energy, a hydro-mechanical-electric coupling model was constructed to formulate the electric energy converted from kinectic energy, potential energy, pressure energy and the reservoir energy. Reservoir energy is analyzed by such way, in which water body of reservoir is divided into multiple levels due to the shape of the bottom of the reservoir. By using the priciple of force analysis and energy conversion. The dynamic characteristics of instant power rate of hydropower-diven generator is studied for different factors, such as penstock angle, reservoir adjustment ability, reservoir water body, and maximal usage hours and so on. Some examples are employed to illustrate the feasiblility of the proposed method, and the simulation results shows that it could provide theory basis for the hydropower plant construction, economic operation and high effective utilization and transformation of hydro-energy.

The authors propose a hybrid power injection model of static synchronous series compensator(SSSC) for power flow and voltage stability analysis,and derive the power flow equation after the SSSC model is added to power system.On the basis of power flow calculation and singular value decomposition,the index to judge the nodes with weak voltage stability based on the hybrid SSSC model and singular value decomposition is constructed.By use of singular value analysis the impacts of SSSC on power system voltage stability under average growth of power load and load growth at the most sensitive nodes are analyzed in depth.The way to judge the weakest node in power system and the node with the fastest load growth is researched by use of the index to judge weak node and the index of most dangerous load growth mode.It is proved that adding SSSC to the weakest node and the node with the fastest load growth can enhance power system voltage stability.The feasibility,effectiveness and applicability of the constructed hybrid SSSC model and the two power source stability analysis indices are validated by simulative calculation results of IEEE 14-bus test system.