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计及线路电热耦合的新能源接入通道全寿命经济性评估
作者:
作者单位:

电网智能化调度与控制教育部重点实验室(山东大学),山东省 济南市 250061

作者简介:

张睿祺(1995—),男,硕士研究生,主要研究方向:电力系统评估、电力系统运行。E-mail:zhang_ruiqi@foxmail.com
董晓明(1980—),男,通信作者,副研究员,硕士生导师,主要研究方向:电力系统运行、电力系统控制、电力系统稳定性。E-mail:dongxiaoming@sdu.edu.cn
王孟夏(1983—),男,讲师,硕士生导师,主要研究方向:电力系统分析与控制。Email:wangmx@sdu.edu.cn

通讯作者:

基金项目:

山东省重点研发计划资助项目(2019GGX103044)。


Life-cycle Economic Evaluation of Renewable Energy Access Considering Line Electro-Thermal Coupling
Author:
Affiliation:

Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University), Jinan 250061, China

Fund Project:

This work is supported by Shandong Provincial Key R&D Program of China (No. 2019GGX103044).

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    摘要:

    以大规模风电远距离传输并网为研究背景,考虑环境因素对新能源传输通道载流规律及其机械性能劣化影响的同步作用,将电热协调理论与线路老化失效模型有机结合。首先,提出了基于电热耦合和全寿命周期成本的新能源承载线路最大允许温度评估模型,为电网的新能源消纳能力及其运行绩效提供评价依据。模型依据多种最大允许温度设定方案,连续化处理环境变量值,基于架空导线热惯性方程模拟线路全年电气和物理状态参量的变化。然后,统计各温度区间的持续时间并依据输电线路老化失效模型预估线路全寿命周期性能演化。基于故障率模型计算线路全寿命周期成本,在单位风电接入收益固定的前提条件下建立输电线路投资年平均利润与线路最大允许温度的函数解析表达,从而实现年平均利润最大化目标。最后,通过实际场景算例分析验证所提模型的有效性,及其对提高系统运行经济性和安全性的作用。

    Abstract:

    Taking long-distance large-scale wind farms connected to the grid as the research background, and considering the synchronization effect of environmental factors on the current-carrying law of the transmission line and its mechanical performance degradation, electro-thermal coordination theory and line aging failure model are organically combined. Based on the electro-thermal coupling and life-cycle cost, the maximum allowable temperature assessment model for renewable transmission lines is proposed, which provides an evaluation basis for the renewable energy consumption capacity and operation performance of the grid. The model continuously processes the environmental variable values according to various setting schemes of maximum allowable temperature, and simulates annual variations of electrical and physical state parameters of the line based on the thermal inertia equation of the overhead conductor.Then, the duration of each temperature interval is calculated and the life-cycle performance of line is predicted based on the aging failure model of transmission line. The life-cycle cost of the line can be obtained according to the failure rate model, the annual average profit of investment for transmission line and analytic function expression of the maximum allowable temperature for transmission line on the premise that the access income of unit wind power is fixed, thereby achieving the goal of maximizing the annual average profit. Finally, effectiveness of the proposed model and its effect on improving the economic and safety of the system operation are verified by the actual case study.

    图1 两节点等值系统Fig.1 Two-node equivalent system
    图2 方法流程图Fig.2 Flow chart of the method
    图3 单位小时平均接受功率和线路服役寿命变化曲线Fig.3 Variation curves of average received power per hour and service life of lines
    图4 年平均利润和最大允许温度的关系曲线Fig.4 Curves of relationship between annual average profit and maximum allowable temperature
    图1 两节点等值系统Fig.1 Two-node equivalent system
    图2 方法流程图Fig.2 Flow chart of the method
    图3 单位小时平均接受功率和线路服役寿命变化曲线Fig.3 Variation curves of average received power per hour and service life of lines
    图4 年平均利润和最大允许温度的关系曲线Fig.4 Curves of relationship between annual average profit and maximum allowable temperature
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引用本文

张睿祺,董晓明,王孟夏,等.计及线路电热耦合的新能源接入通道全寿命经济性评估[J].电力系统自动化,2020,44(3):83-88. DOI:10.7500/AEPS20190619007.
ZHANG Ruiqi,DONG Xiaoming,WANG Mengxia,et al.Life-cycle Economic Evaluation of Renewable Energy Access Considering Line Electro-Thermal Coupling[J].Automation of Electric Power Systems,2020,44(3):83-88. DOI:10.7500/AEPS20190619007.

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  • 收稿日期:2019-06-19
  • 最后修改日期:2019-09-10
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  • 在线发布日期: 2020-02-14
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