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考虑新能源波动区间的交直流配电网下垂斜率鲁棒优化方法
作者:
作者单位:

1.浙江大学电气工程学院,浙江省杭州市 310027;2.中国电力科学研究院有限公司,北京市 100192;3.国网江苏省电力有限公司,江苏省南京市 210024

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基金项目:

国家重点研发计划资助项目(2018YFB0904700);国家电网有限公司科技项目资助(SGDK0000PDJS1806935)。


Robust Optimization Method for Droop Slopes in AC-DC Distribution Network Considering Fluctuation Interval of Renewable Energy Sources
Author:
Affiliation:

1.College of Electrical Engineering, Zhejiang University,Hangzhou 310027, China;2.China Electric Power Research Institute,Beijing 200192, China;3.State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210024, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2018YFB0904700) and State Grid Corporation of China (No. SGDK0000PDJS1806935).

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    摘要:

    为应对交直流配电网中新能源出力的不确定性,以交直流混合配电网电压源型变流器(VSC)为研究对象,提出了考虑新能源波动区间的交直流配电网VSC下垂斜率鲁棒优化方法。该方法在保证系统鲁棒安全的前提下最小化期望场景的网损,并采用列和约束生成算法进行求解。在下垂控制中,提出-P-双下垂控制,在保证线性反馈下垂特性的前提下,将模型的子问题转化为混合整数二阶锥规划问题。此外,为提高子问题二阶锥松弛的精确性,提出了支路损耗限值策略,通过求解支路损耗最优潮流模型,确定每次迭代过程中给定斜率下各支路可能的最大损耗,并在子问题中以此为约束对支路电流进行限值。数值实验结果表明,提出的优化方法可以以微小的经济代价显著提高系统的鲁棒安全性。支路损耗限值策略能有效提高二阶锥松弛的精确性,从而增强子问题对于极端场景的寻优能力。

    Abstract:

    In order to deal with the uncertainty of the output power of renewable energy sources (RESs), this paper proposes a robust optimization method for voltage source converter (VSC) droop slopes in AC-DC distribution networks considering fluctuation interval of RESs. The proposed method aims to minimize the network loss under expect scenarios while ensuring the system robust security. The optimization model is solved by the column-and-constraint generation (CCG) algorithm. Besides, -P and -Q control are proposed in the droop control schemes to guarantee the linear feedback characteristic, therefore the sub-problem could be transformed into a mixed integer second-order cone programming (MI-SOCP) problem. Furthermore, to increase the accuracy of second-order cone relaxation in the sub-problem, a branch loss limit strategy is designed. By solving the maximum branch loss optimal power flow problem, the maximum possible branch loss is pre-identified, and a series of branch current limit constraints are added to the sub-problem to restrain the feasible range of the branch current. Numerical simulations suggest that the proposed optimization method can improve the system security with little extra economic cost, and the proposed branch loss limit strategy can improve the searching ability of the sub-problem for the extreme scenarios. Therefore, the reliability of the optimization results can be enhanced.

    表 3 VSC的有功功率Table 3 Active power of VSCs
    表 4 预测误差敏感性分析Table 4 Sensibility analysis of prediction errors
    表 8 Table 8
    表 2 不同方法下系统安全性比较Table 2 Comparison of security performance with different methods
    表 6 Table 6
    图1 交直流配电网示意图Fig.1 Diagram of AC-DC distribution network
    图3 鲁棒优化模型求解流程Fig.3 Solving process of robust optimization model
    图4 交直流配电网拓扑结构Fig.4 Topology structure of AC-DC distribution network
    图5 直流子网电压分布Fig.5 Voltage distribution of DC subnet
    图6 直流子网电流分布Fig.6 Current distribution of DC subnet
    图7 新能源波动区间分析Fig.7 Fluctuation interval analysis of renewable energy resources
    表 7 Table 7
    表 1 长期源荷出力预测数据Table 1 Forecast data of long-term source load output
    表 5 支路损耗限值分析Table 5 Analysis of branch loss limit
    表 9 Table 9
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引用本文

孙峰洲,刘海涛,陈庆,等.考虑新能源波动区间的交直流配电网下垂斜率鲁棒优化方法[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20190903004.
SUN Fengzhou,LIU Haitao,CHEN Qing,et al.Robust Optimization Method for Droop Slopes in AC-DC Distribution Network Considering Fluctuation Interval of Renewable Energy Sources[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190903004.

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  • 收稿日期:2019-09-03
  • 最后修改日期:2020-04-09
  • 录用日期:2019-12-02
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