基于灵敏度分析的交直流配电网无功补偿策略
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作者单位:

1.国网河南省电力公司经济技术研究院;2.长沙理工大学电气与信息工程学院

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中图分类号:

TM761

基金项目:

湖南省自然科技基金项目(2020JJ5574)、湖南省教育厅优秀青年项目(19B003)


Reactive Power Compensation Strategy for AC/DC Hybrid Distribution Network Based on Sensitivity Analysis
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1.State Grid Henan Electric Power Company Economic and Technical Research Institute;2.School of Electrical Information Engineering,Changsha University of Science and Technology

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    摘要:

    通过无功补偿可以优化交直流混联配电网的电压分布,减少网络损耗,增大电网安全裕度,提高供电可靠性。为了实现交直流混联配电网无功功率的定向补偿,直观地刻画系统的电压薄弱点,提出了基于灵敏度分析的交直流混联配电网无功补偿方法。基于交替迭代法进行交直流混联配电网潮流计算,以获取潮流收敛后的雅克比矩阵,据此计算节点电压变化关于无功注入的灵敏度,选择灵敏度最大的点作为无功补偿接入点;并以满足系统功率因数要求为目标,确定接入点的无功补偿容量。对某11节点系统进行算例分析,计算结果与和声算法相比,本文方法计算耗时更短,补偿效果更优。结果表明本文方法能以最小的补偿容量最大程度地提升系统电压水平,有效降低系统网损。

    Abstract:

    By means of reactive power compensation, the voltage distribution in AC-DC hybrid distribution network can be op-timized, the network loss can be reduced, the safety margin of the network can be increased, and the power supply reliability can be improved. In order to realize the directional compensation of the reactive power in AC-DC hybrid distribution network and describe the weak point of the voltage in the system directly, a reactive power compensation method based on sensitivity analysis is proposed. Based on alternating iteration method, the power flow of AC-DC hybrid distribution network is calculated to obtain the Jacobian matrix in which the power flow has converged, there-by calculating the sensitivity of node voltage change on reactive power injection, and selecting the point with the maximum sensitivity as the reactive power compensation access point. In addition, to meet the requirement of system power factor, the reactive power compensation capacity of access point is determined. An example analysis conducted on 11-node system shows that this method takes less time to calculate and has better compensation effect compared with the harmony algorithm. The results show that the proposed method can raise the system voltage level with the minimum compensation capacity at the greatest extent and effectively reduce the system network loss.

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  • 收稿日期:2020-12-16
  • 最后修改日期:2020-12-25
  • 录用日期:2021-01-07
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