基于路径描述的馈线分区N-1可装容量计算方法

评估馈线供电能力是保障馈线可靠运行的重要手段。文中提出了一种基于路径描述的馈线分区N-1可装容量计算方法。首先,将同一电压等级配电网以自动/手动开关装置为边界划分馈线分区,视为负荷节点;采用所有负荷节点及其所有可能供电路径的集合描述配电网拓扑结构。随后,以路径状态为变量,建立了馈线N-1安全校验的0-1线性规划模型。针对电网营销部门的实际数据需求,以路径状态和馈线分区可装容量为变量,进一步建立了用于馈线分区N-1可装容量计算的混合整数线性规划模型。最后,以某省会城市实际运行的某一10 k V馈线组为例,验证了所提算法的实用性和有效性。

一种基于数据挖掘的馈线可装容量模型分析方法

馈线作为配网运行最关键的设备之一,评估馈线供电能力是保障配网运行的重要手段。本文通过引入馈线组负荷同时系数和需要系数两个参数,构建计算模型,求解馈线可装容量以评估馈线供电能力。首先,通过聚类分析和神经网络预测等方法预测馈线组负荷同时系数。然后,将馈线各负荷根据其实际接入容量情况分为饱和负荷和未饱和负荷,采用灰色预测和神经网络相结合的组合预测方法计算未饱和负荷的需要系数。最后,将预测得到的两个系数代入馈线可装容量计算模型进行求解。实际算例分析表明:所提方法的计算结果具有一定的预测趋势,充分利用了馈线载流量,并兼顾了配电网运行的可靠性,对于指导电网营销部门业扩报装工作具有重要意义。

Electricity Generation in Turkey by Geothermal Energy Resources

Electricity generation generally is made in thermal, hydro, geothermal power plants and windfarms/windparks. Because of some advantages such as renewability, low-cost, clean, safe and naturality geothermal and wind energy will have been electricity generation source in the near future. Turkey has hot water springs suitable for electricity generation between 130-242 ~C with natural vapor and hydrothermal alterations in connection with grabens limited to active faults and diffuse young volcanism in Western Anatolia Region. Other renewable energy and electricity generation resource is wind energy. In Turkey electricity generation is made by windfarms/windparks. These parks/farms are generated 1,414.55 MW electricity. The year 2010 electricity general total installed capacity in Turkey is about 49,524.1 MW. According to the total installed capacity, thermal power plants have 65.18%, hydro power plants have 31.97%, geothermal power plants and wind farms have 2.85%. Electricity generation generally was obtained from 15 thermal power plants. In this study high temperature geothermal fields and windparks/windfarms in Turkey which are suitable for electricity generation potential were investigated.

Economic Assessment for Optimum Wind Farm Investment Connected to a Distribution System

Decarbonization of electricity industry for the goal of sustainability success has resulted in large investment in alternative energy sources such as wind, solar, biomass. Although these energy resources are sustainable and have the potential of reducing the world carbon foot print, there are costs associated with its utilization. In recent time, electricity from alternative energy sources like wind and solar are not cost competitive with electricity from the conventional power plant. This paper is aimed at investigating the optimum investment in a typical wind farm project using a TSA （time series analysis） alongside simple economic tool, AAP （annual annuity payment） model. This study involves a year round analysis of （8,760h） at different wind farm capacity connected to a 132/33kV DS （distribution system）. It also focused on digressing from the technical and environmental benefits to financial assessment of increasing wind generation capacity in the DS. Indeed, this development presents a risk of investment to the stakeholders which necessitates proper scrutiny and to ensure profitability of the venture. The level of capital cost along with operation and maintenance （OM） costs are either financed by private or public sectors on wind farm with the sole aim of achieving the ROI （return-on-investment）. The results obtained from this study shows the possible ROI is not proportional to the wind capacity invested. Also, a sensitivity analysis conducted revealed the profit derived from wind farm is more responsive to the investment/capital cost and the price at which the electricity is being sold.

基于馈线组主备供电关系及终端用户分析的异常运行方式评估应用

为准确评估馈线组供电终端内的用户异常运行行为,从而对配电网环境进行合理的保护,针对基于馈线组主备供电关系及终端用户分析的异常运行方式评估应用展开研究。建立完善的配电系统供电架构,通过供电线连接的方式,计算主要设备元件的实际供电量水平,完成馈线组的主备供电关系分析。在此基础上,确定终端节点的供电能力与可装容量,再联合必要的异常负荷系数,实现对终端用户的异常运行方式评估。对比实验结果表明,与路径描述型评估手段相比,异常运行评估方法支持下,终端主机对于馈线组供电用户异常运行行为的评估准确性达到94%,可在维护常规供电关系的同时,实现对配电网环境的合理保护。

基于路径描述技术的配电能力研究

针对配电网中网络连接、馈线分段等因素与供电能力的不匹配问题,提出了一种使用路径描述技术的配电能力的分析算法。为了准确地分析配电网的供电能力,首先构建了0-1线性规划的计算模型,对配电网进行安全校验;其次,使用动作开关的数量作为目标函数,设定路径状态和负荷增量为具体变量,利用混合整数线性规划问题的求解方法,对配电网的供电能力和可装容量进行具体的分析;最终,形成基于路径描述技术的配电能力分析算法。此外,还使用具体的算例对该算法进行了测试。测试结果表明,本算法充分的考虑了配电网中馈线分段和网络连接情况等因素,具有广泛的适用性、较高的计算精确度和较强的实际推广价值。