输电线路热载荷能力与风力发电的整合研究

发布时间：2018-03-19 06:36

本文选题：输电线路　切入点：热载荷能力　出处：《山东大学》2017年硕士论文　论文类型：学位论文

【摘要】：电网的输电能力制约着发电与负荷的发展,作为电力输送的载体,输电线路在电网的建设中扮演着关键的角色。输电线路动态热定值(dynamic thermal rating,DTR)以温度作为限制输电线路热载荷能力的本质因素,基于实际气象环境并结合温度变化的热惯性热点,得到最高允许温度限制下的输电线路最大允许载流。风能作为清洁能源和可再生能源越来越多地并入电网,风电出力及线路热载荷能力均受到气象环境参数的影响,尤其是风速,对线路热载荷能力及风电出力进行整合研究,更有效地利用DTR提高输电线路热载荷能力,提高风电消纳能力,成为亟待研究的课题。此外,DTR描述输电元件个体定值与电网的运行调度脱离,因此,将DTR与电网的运行调度及控制决策相结合对提高电网系统运行的安全性和稳定性具有重要意义。首先,基于IEEE标准下的DTR评估模型,分析导体吸散热机理。分析雨雪天气条件下导体表面雨水积雪蒸发融化对导体温度的影响,对IEEE标准模型下的导体吸散热因子进行扩展,构建包含蒸发散热项的IEEE标准下的扩展因子估计模型。通过算例分析IEEE标准模型及其扩展因子模型下输电线路热载荷能力的差异性以及导体各项散热量间的关系,分析蒸发散热对导体热平衡状态以及对提高导线利用率的影响。其次,根据风电场一机一变集送电接线方式,综合风机功率特性曲线和不同风速风向下输电线路载流特性曲线,分析风电场送出线路载流量增容原理,并通过算例分析DTR对增加风电场风机投运数量以及提高电网风电消纳能力的影响。分析影响输电线路暂态过载能力的各项因素,通过算例分析暂态热定值对缓解电力系统阻塞、减少系统切负荷以及降低系统切风率的作用。最后,结合导体温度、导体允许载流越限时间和电力系统潮流规律,从系统运行、调度及决策的角度,实现DTR的超前应用。通过算例分析超前热定值在处理电网预想事故中的作用与优势,并结合风功率预测,分析在含有风电场的电力系统中,风功率的变化对超前热定值作用下的超前调度决策制定的影响。综上,对输电线路热载荷能力与风力发电进行整合研究,并与电力系统的运行调度相结合,对提高电网的风电消纳能力,保证系统的安全稳定运行具有重要的意义。
[Abstract]:The power grid transmission capacity restricts the development of the electric power and load, as the carrier of power transmission, transmission line plays a key role in the construction of power grids. The dynamic thermal rating of transmission line (dynamic thermal, rating, DTR) with temperature as the essential factors limiting the heat capacity of transmission lines, the actual meteorological environment and hot thermal inertia with the change of temperature based on the transmission line, get the maximum allowable temperature limits the maximum allowable load flow. The wind energy is clean and renewable energy sources are increasingly incorporated into the grid, the impact of wind power output and line heat capacity are the meteorological environment parameters, especially the wind speed, on line heat capacity and wind power output integration, more effective use of DTR to improve the heat capacity of transmission lines, improve the absorptive capacity of wind power, becomes an urgent issue. In addition, DTR describes a transmission component Body fixed value from, and scheduling the operation of power grids will therefore, dispatching and control decision DTR and power combination is of great significance to improve the power system's safety and stability. Firstly, the DTR evaluation model of IEEE standard based on the analysis of absorption and dissipation mechanism. Influence on conductor conductor temperature of rain and snow under the condition of rain snow melting on the conductor surface evaporation, conductor IEEE standard model of the absorption and dissipation factor of expansion, construction of the evaporative heat dissipation factor contains extended IEEE standard estimation model. Through the example analysis of the relationship between the differences in transmission line heat capacity IEEE standard model and its extended model of the factor and the heat dissipation between the conductor the analysis of evaporation heat conductor of heat balance and to improve the effect of wire utilization. Secondly, according to the wind machine change in electric connection mode, comprehensive wind Transmission line machine power curve and wind load under different flow characteristic curve, flow capacity of wind load analysis principle of transmission lines, and through the example analysis of DTR to increase the number of wind field operation and improve the effect of wind power consumptive ability. The analysis of the factors influencing the transmission line transient overload capacity, through an example set the value of blocking to ease the analysis of power system transient heat, reduce system load shedding and reduce wind shear rate. Finally, combined with the current carrying conductor conductor temperature, allowing more limited time and tide law of power system, from the system, scheduling and decision-making point of view, application of advanced DTR. Through the example analysis in advance the heat setting function and advantages in the treatment of contingency in power grid, combined with wind power prediction, analysis in power system with wind farm, wind power changes of advanced thermal rating for With the influence of advanced scheduling decisions. Therefore, the integral research on transmission line thermal load capacity and wind power, and combined with the scheduling of power system, to improve the ability of accommodating wind power grid, which has important significance for the safe and stable operation of the system.

【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM614

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