基于输电线路最大输电能力的输电网合理利用率评估  

Rational Utilization Rate Evaluation of the Transmission Network Based on the Transmission Line Total Transfer Capability

作　　者：杨钤 王建学 林帆 张耀 YANG Qian;WANG Jianxue;LIN Fan;ZHANG Yao(School of Electrical Engineering,Xi’an Jiaotong University,Shaanxi Key Laboratory of Smart Grid,Xi’an 710049,Shaanxi Province,China)

机构地区：[1]西安交通大学电气工程学院(陕西省智能电网重点实验室),陕西省西安市710049

出　　处：《全球能源互联网》2021年第4期334-343,共10页Journal of Global Energy Interconnection

基　　金：国家重点研发计划(2017YFB0902200)。

摘　　要：能源转型背景下新能源的迅猛发展给电力系统带来更多不确定性,如何评估在此形势下电网规划方案的合理性是一项重大挑战。输电线路利用率是评价输电资源利用的关键指标,但传统利用率指标通常以热稳定极限功率为参照,忽略了电网运行状态对线路输电能力的影响,无法从指标本身分析输电资源利用水平受限的原因。在系统安全约束限制下,输电线路最大输电能力(total transfer capability,TTC)一般小于热稳定极限功率。对输电线路TTC的计算方法进行了研究,以最优潮流模型为基础,从单时段和多时段两方面分别计算输电线路在系统安全约束下的TTC,同时设计线性化方法降低模型求解难度。然后基于输电线路TTC,提出能够有效表征输电线路资源利用水平的改进利用率计算方法。最后,算例分析对输电线路TTC进行了讨论,对输电线路合理利用率做出评估分析,得出输电资源利用水平受限原因,验证了所提模型和方法的合理性与有效性。In the context of energy transition,the rapid development of renewable energy brings more uncertainty to the operation of power systems.Evaluating the rationality of the power grid planning scheme under this situation is a major challenge.The transmission line utilization rate is the key index for evaluating the utilization of transmission resources,but the traditional calculation method of transmission line utilization rate usually takes the limit transmission power of the line thermal stability as a reference,neglecting the influence of the grid operation state on transmission capacity.Therefore,it is impossible to analyze the reasons for the limited utilization of transmission resources from the index itself.The total transfer capability(TTC)of the transmission line is generally less than the thermal stability limit power under the system safety constraints.This study researches the calculation method of the transmission line TTC.Specifically,based on the optimal power flow model,the transmission line TTC under the system safety constraints from a single period and multiple periods will be calculated.Simultaneously,the corresponding linearization method was designed to reduce the difficulty of solving the model.Then,based on the transmission line TTC,an improved utilization rate index calculation method that can effectively represent the utilization level of transmission lines is proposed.Finally,transmission line TTC is discussed in the case study,and the rational utilization rate index of the transmission line is evaluated to determine the reasons for the limited utilization of transmission resources,which can verify the rationality and effectiveness of the model and method proposed in this paper.

关 键 词：新能源 输电线路 最大输电能力 合理利用率 系统评估 

分 类 号：TM715[电气工程—电力系统及自动化]