Fault Voltage Fluctuation Suppression Method for AC/DC Hybrid Distribution Network Considering Output Fluctuation of Distribution Generation

LI Meng; SUN YiHao; FAN Jiangchuan; ZHAO Yan

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Fault Voltage Fluctuation Suppression Method for AC/DC Hybrid Distribution Network Considering Output Fluctuation of Distribution Generation

更新时间：2025-06-18

- Fault Voltage Fluctuation Suppression Method for AC/DC Hybrid Distribution Network Considering Output Fluctuation of Distribution Generation
- High Voltage Apparatus Pages: 1-8(2025)
- 作者机构：
  
  1.国网河南省电力公司经济技术研究院，郑州　 450000
  2.国网河南省电力公司营销服务中心，郑州　 456000
- 作者简介：
- 基金信息：
  
  Science and Technology Project of State Grid Henan Electric Power Company(5217L0220013)
- DOI：
  CLC：
- Published：
- 稿件说明：
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LI Meng, SUN YiHao, FAN Jiangchuan, et al. Fault Voltage Fluctuation Suppression Method for AC/DC Hybrid Distribution Network Considering Output Fluctuation of Distribution Generation[J/OL]. High voltage apparatus, 2025, 1-8.
DOI：

LI Meng, SUN YiHao, FAN Jiangchuan, et al. Fault Voltage Fluctuation Suppression Method for AC/DC Hybrid Distribution Network Considering Output Fluctuation of Distribution Generation[J/OL]. High voltage apparatus, 2025, 1-8. DOI：

摘要

交直流混联配电网线损小、供电容量高、电能质量优，是现代配电网的发展趋势。同时，交直流混联配电网故障后，分布式电源的不确定性会引起配电网故障切除后的电压波动。为解决此问题，提出基于储能控制的交直流混联配电网故障电压波动平抑方法，分析了交直流混合配电网故障特征，建立了配电网储能逆变器控制器模型，提出了基于变步长扰动控制的改进V/f控制策略，减小了光伏出力波动对故障配电网电压及频率安全的影响。仿真结果表明：通过对储能系统的控制，系统发生三相故障、两相短路故障和单相接地故障时，电压和频率波动都有一定的抑制作用，在单相接地短路时抑制作用尤为突出，仿真结果显示采用文中所提的方法电压有效值电压有效值偏移约在2.5%。而采用传统的V/f控制电压有效值的偏移约在44%，电能质量得到大大提升，频率偏移也稍有下降，验证了文中所提方法对于平抑交直流混联配电网故障电压波动的有效性。

Abstract

AC-DC hybrid distribution network with low line loss

high power supply capacity and excellent power quality is the development trend of modern distribution network. Meanwhile

after the fault of AC-DC hybrid distribution network

the uncertainty of distributed power supply will cause the voltage fluctuation after fault removal of distribution network. In order to solve this problem

a fault voltage fluctuation smoothing method based on energy storage control is proposed for AC/DC hybrid distribution networks

the fault characteristics of AC/DC hybrid distribution networks are analyzed

the distribution network storage inverter controller model is established

and an improved V/f control measurement strategy based on Variable Step Perturbation Control is proposed to reduce the impact of PV output fluctuations on faulty distribution network voltage and frequency security. The simulation results show that through the control of energy storage

the voltage and frequency fluctuations are suppressed when three-phase faults and single-phase ground faults occur in the system

and the power quality is improved

which verifies the effectiveness of the method proposed in this paper for smoothing the fault voltage fluctuations in AC-DC hybrid distribution networks.

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references

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