| 引用本文: | 胡文曦,肖先勇.电网结构对电压暂降传播的影响及其量化分析方法[J].电力自动化设备,2020,40(7): |
| HU Wenxi,XIAO Xianyong.Influence of grid structure on voltage sag propagation and its quantitative analysis method[J].Electric Power Automation Equipment,2020,40(7): |
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| 摘要: |
| 有效的电压暂降治理方法对减少用户经济损失起着重要的作用。现有电压暂降治理方法基于随机预估等方式获取电网各节点的电压暂降水平，从而针对暂降严重的节点进行治理，但这些方法仅能量化暂降水平的大小，难以分析造成暂降严重的根本原因，治理效果亟待提高。其本质原因在于忽视了电压暂降在电网中的传播规律和电网结构对电压暂降的影响机制。为此，对电压暂降受电网结构属性的影响进行分析并对其量化方法开展研究。首先，基于电网故障模型分析电压暂降幅值与电网结构的关系，并将监测周期内多次故障下电网所有节点电压平均幅值构成的序列定义为电压暂降模式，以挖掘电压暂降受电网结构属性的影响；然后，通过分析电压暂降的传播特性，从电网拓扑属性和物理属性出发提出电压暂降结构性指标，从电网节点规模程度、聚集程度、传播效率和支撑能力等不同的方面量化电网结构对电压暂降的影响；最后，提出电压暂降受电网结构影响程度的综合评估方法，为电网侧电压暂降治理提供决策支持。基于IEEE 30节点系统的仿真结果验证了所提方法能够反映电网结构对电压暂降的影响规律，以敏感用户接入电网的规划为例，验证了所提结构指标有助于从电网侧治理电压暂降问题，并能够对优质供电园区的电网规划与重构、电网运行方式反演、电压暂降传播途径抑制等措施提供决策支持。 |
| 关键词: 电压暂降 传播规律 电网结构属性 结构指标 暂降治理 |
| DOI：10.16081/j.epae.202006009 |
| 分类号:TM761 |
| 基金项目: |
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| Influence of grid structure on voltage sag propagation and its quantitative analysis method |
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HU Wenxi, XIAO Xianyong
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College of Electrical Engineering, Sichuan University, Chengdu 610065, China
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| Abstract: |
| The effective voltage sag management methods play an important role in reducing the economic loss of users. Existing voltage sag management methods obtain the voltage sag level of each node in the grid based on random estimation and other methods, so as to control the nodes with serious sag. However, these methods can only quantify the magnitude of voltage sag level but not analyze the fundamental cause of the serious sag, and the management effect needs to be improved urgently. The essential reason is that the propagation rule of voltage sag in power grid and the influence mechanism of power grid structure on voltage sag are neglected. For this reason, the influence of grid structure attribute on voltage sag is analyzed and its quantitative method is studied. Firstly, based on the grid fault model, the relationship between the voltage sag magnitude and the grid structure is analyzed, and the sequence of the average voltage amplitude of all nodes in the grid under multiple faults during the monitoring period is defined as the voltage sag pattern, so as to explore the influence of grid structure attributes on voltage sag. Then, by analyzing the propagation characteristics of voltage sag, the structural indicators of voltage sag are proposed based on the topological and physical properties of power grid, and the influence of power grid structure on voltage sag is quantified from different aspects, such as node size degree, aggregation degree, propagation efficiency and supporting capacity. Finally, a comprehensive evaluation method of influence degree is proposed to provide decision support for grid side voltage sag management. Simulative results based on IEEE 30-bus system verify that the proposed method can reflect the influence of grid structure on voltage sag. Taking the planning of power grid with sensitive users as an example, it is verified that the proposed structural indicators are helpful to control the voltage sag problem from the power grid side, and can provide decision-making support for power grid planning and reconstruction, inversion of power grid operation mode and suppression of voltage sag propagation path in the high quality power supply park. |
| Key words: voltage sag propagation rule structure attribute of power grid structural indicators sag management |
