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计及电网结构参数变化的有功静态安全域快速构建方法
作者:
作者单位:

1.武汉大学电气与自动化学院,湖北省 武汉市 430072;2.国网湖北省电力有限公司电力科学研究院,湖北省 武汉市 430077;3.国家电网公司华中分部,湖北省 武汉市 430077

作者简介:

通讯作者:

基金项目:

国家重点研发计划资助项目(2017YFB0902600);国家电网公司科技项目(SGJS0000DKJS1700840)。


A Fast Construction Method of Active Power Static Security Region Considering Variation of Structural Parameters in Power Gird
Author:
Affiliation:

1.School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China;2.Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China;3.Central China Branch of State Grid Cooperation, Wuhan 430077, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2017YFB0902600) and State Grid Corporation of China(No. SGJS0000DKJS1700840).

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    摘要:

    注入功率空间有功静态安全域(APSSR)表征了在给定网络结构下电力系统安全稳定运行的注入功率可行域,有助于电网在线安全评估和预防控制。随着以可控串联补偿器(TCSC)、统一潮流控制器(UPFC)为代表的柔性交流输电装置的接入,电网结构参数连续可调。传统的APSSR构建方法基于固定结构参数得到,电网结构参数频繁调整时计算速度受限于高维导纳矩阵的求逆运算,难以满足在线应用的需要。为此,以TCSC为例进行研究,将电网结构参数变化对潮流分布的影响转化为修正节点注入功率,构建了计及电网结构参数的APSSR超平面边界系数矩阵的显示表达式,为APSSR的快速构建和在线应用提供了一种可行思路。进一步,针对APSSR安全裕度评估对电力系统预防控制和结构参数优化两方面的指导作用进行了分析。最后,基于多个不同规模、不同数量TCSC的IEEE算例,验证了所提方法的正确性和在计算效率方面的优越性,并通过某省级电网500 kV输电线路为例进一步对所提方法的应用价值进行说明。

    Abstract:

    Active power steady-state security region (APSSR) represents feasible region of injection power for safe and stable operation under given power grid structure, which is conducive to online security assessment and preventive control. With connecting flexible alternative current transmission devices such as thyristor controlled series compensations (TCSCs) and unified power flow controllers (UPFCs), structural parameters in power grid is becoming continuously adjustable. The construction method of traditional APSSR is obtained based on the fixed structural parameters. Calculation speed is limited by inversion of high-dimensional parametric matrix when the structural parameters are frequently adjusted and hard to satisfy demand of online applications. So, the research is carried out which takes TSCS as an example, influence of variation for structural parameters in the power grid on power flow distribution is transferred into modifying the injected power of nodes, and explicit expression of hyperplane boundary coefficient matrix for APSSR is constructed considering structural parameters in the power grid, which provides an available way for fast construction of APSSR and online application. Furthermore, the instructional role of safety margin assessment in two aspects such as preventive control of power system and structural parameter optimization is analyzed. Finally, based on different grid scales and quantities of TCSCs in IEEE cases, the effectiveness of proposed method and superiority in computational efficiency are verified, the application value is further illustrated by an example of 500 kV transmission line in provincial grid.

    表 2 不同规模算例计算时间对比Table 2 Comparison of computation time with different scale cases
    表 1 XTCSCi=-0.004(i=1,2,3)时支路14-4超平面系数Table 1 Hyper plane coefficients of branch 14-4 when XTCSCi=-0.004 (i=1, 2, 3)
    图1 含TCSC网络示意图Fig.1 Schematic diagram of grid with TCSC
    图2 IEEE 10机39节点标准系统Fig.2 Standard system of IEEE 10-machine 39-node
    图3 支路2-9串接TCSC后支路7-8的潮流约束Fig.3 Power flow constrains of branch 8-7 when branch 2-9 with TCSC
    图4 基于APSSR快速构建方法进行稳定预判Fig.4 Stability pre-judgment process according to APSSR fast construction method
    表 3 不同TCSC个数计算时间对比Table 3 Comparison of computation time with different numbers of TCSCs
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引用本文

杜蕙,林涛,陈汝斯,等.计及电网结构参数变化的有功静态安全域快速构建方法[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190709007.
DU Hui,LIN Tao,CHEN Rusi,et al.A Fast Construction Method of Active Power Static Security Region Considering Variation of Structural Parameters in Power Gird[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190709007.

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  • 收稿日期:2019-07-09
  • 最后修改日期:2020-02-27
  • 录用日期:2019-09-29
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