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考虑UPFC控制模式的N-1安全约束最优潮流及应用
作者:
作者单位:

1.东南大学电气工程学院,江苏省 南京市 210096;2.国网江苏省电力有限公司科信部,江苏省 南京市 211103;3.国网江苏省电力有限公司检修分公司,江苏省 南京市 211102

作者简介:

通讯作者:

基金项目:

国家电网公司科技项目(SGJSJX00YJJS1800739)。


N-1 Security Constrained Optimal Power Flow Considering Control Modes of Unified Power Flow Controller and Its Application
Author:
Affiliation:

1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.Science and Information Department, State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China;3.Maintenance Branch of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211102, China

Fund Project:

This work is supported by State Grid Corporation of China (No. SGJSJX00YJJS1800739).

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    摘要:

    统一潮流控制器(UPFC)能有效解决电网潮流分布不均引起的一系列问题,近年来受到广泛关注。为进一步挖掘UPFC控制潜力、提高电网运行的安全性,提出了一种考虑UPFC控制模式的N-1安全约束最优潮流模型。首先,建立了考虑UPFC双回线结构的等效功率注入模型;其次,结合苏州南部500 kV实际电网算例,分析了UPFC控制模式对静态安全性的影响,指出了在潮流优化过程中考虑UPFC控制模式的必要性;最终,构建以静态安全裕度为目标的优化模型,并在优化的过程中充分计及UPFC控制模式对系统N-1故障后潮流分布的影响,实现系统运行参数与UPFC控制模式的共同择优。基于苏州南部电网的仿真算例表明,所提的潮流优化方法能够充分挖掘UPFC的静态控制潜力,显著提高系统的静态安全水平。

    Abstract:

    The unified power flow controller (UPFC) can effectively solve a series of problems caused by unbalanced power flow distribution, which has received extensive attention in recent years. In order to further explore the control potential of UPFC and enhance the safety of power grids, this paper proposes an N-1 security constrained optimal power flow model considering control modes of UPFC. Firstly, the equivalent power injection model considering the double-circuit structure of UPFC is established. Secondly, combined with the actual example of 500 kV power grid in southern Suzhou of China, the effect of UPFC control mode on static security is analyzed. The necessity of considering UPFC control mode in the process of power flow optimization is also indicated. Finally, the optimization model of the system aiming at minimizing static security margin is constructed. In the optimization process, the effect of UPFC control modes on the power flow distribution after the N-1 fault is fully taken into account to make the optimal selection of both system operation parameters and control modes of UPFC. The results of the simulation case of the power grid in southern Suzhou of China show that the proposed power flow optimization method can fully exploit the static control potential of UPFC and significantly improve the static security of the system.

    表 4 Table 4
    表 2 算例2中优化前后线路均匀度对比Table 2 Comparison of homogeneity before and after optimization in case 2
    图1 基于功率注入法的双回线UPFC等效模型Fig.1 Equivalent model of UPFC in double circuit lines based on power injection method
    图2 考虑UPFC控制模式的N-1安全约束最优潮流控制算法Fig.2 Control algorithm of N-1 security constrained optimal power flow considering control modes of UPFC
    图3 算例1中2种运行状态下优化前后部分线路负荷率对比Fig.3 Comparison of load rates of partial lines before and after optimization under two operation conditions in case 1
    图4 算例1中线路“木渎—梅里”断路时3种控制模式下的部分线路负荷率对比Fig.4 Comparison of load rates of partial lines in three control modes with the open circuit fault of line “Mudu-Meili” in case 1
    图5 算例2中2种运行状态下优化前后部分线路负荷率对比Fig.5 Comparison of load rates of partial lines before and after optimization under two operation conditions in case 2
    图 苏州南部500 kV UPFC工程接线示意图Fig. Connection diagram of the 500 kV UPFC project in the southern Suzhou
    图 苏州南部UPFC环网及附近线路拓扑结构Fig. The topology diagram of UPFC loop network and nearby lines in Southern Suzhou
    图 工况1不同控制模式下部分线路负荷率对比Fig. Comparison of load rates under different modes
    图 工况2不同控制模式下部分线路负荷率对比Fig. Comparison of load rates under different modes
    图 江苏省2020年500 kV规划网架(2020年夏季高峰潮流)Fig. The 500 kV planning grid of Jiangsu Province in 2020
    表 3 Table 3
    表 1 3种控制模式的控制目标Table 1 Control targets of three control modes
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引用本文

吴熙,王梦婷,王亮,等.考虑UPFC控制模式的N-1安全约束最优潮流及应用[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190416005.
WU Xi,WANG Mengting,WANG Liang,et al.N-1 Security Constrained Optimal Power Flow Considering Control Modes of Unified Power Flow Controller and Its Application[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190416005.

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  • 收稿日期:2019-04-16
  • 最后修改日期:2020-03-11
  • 录用日期:2019-11-22
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