Mechanism Analysis of Low Frequency Oscillation on DC Voltage Control Time Scale in DC Distribution System

LI Hairong; PENG Ke; CHEN Yu; GUO Li; LI Pengfei; LI Xialin

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Mechanism Analysis of Low Frequency Oscillation on DC Voltage Control Time Scale in DC Distribution System

更新时间：2025-12-08

- Mechanism Analysis of Low Frequency Oscillation on DC Voltage Control Time Scale in DC Distribution System
- Vol. 47, Issue 6, Pages: 2232-2242(2021)
- 作者机构：
  
  1. 山东理工大学电气与电子工程学院
  2. 天津大学智能电网教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 June 2021，
  
  Published：2021
- 稿件说明：
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LI Hairong, PENG Ke, CHEN Yu, et al. Mechanism Analysis of Low Frequency Oscillation on DC Voltage Control Time Scale in DC Distribution System[J]. 2021, 47(6): 2232-2242.
DOI：

LI Hairong, PENG Ke, CHEN Yu, et al. Mechanism Analysis of Low Frequency Oscillation on DC Voltage Control Time Scale in DC Distribution System[J]. 2021, 47(6): 2232-2242. DOI：

摘要

柔性直流配电系统呈现低惯性弱阻尼特性

易产生低频振荡现象

目前振荡机理尚不明确。针对直流电压控制时间尺度的低频振荡振荡频率机理展开研究

提出了柔性直流配电系统在直流电压控制时间尺度(约100 ms)下的物理等效电路模型

推导了振荡频率的解析形式

通过对低频振荡影响因素的灵敏度分析

提出等效模型的降阶形式

获取了振荡频率与关键参数间的解析关系。基于PSCAD搭建了柔性直流配电系统仿真模型

仿真结果验证了理论分析的正确性与有效性。

Abstract

Flexible DC distribution system exhibits characteristics of low inertia and weak damping

which is easy to induce low-frequency oscillation. At present

the oscillation mechanism is not clear. This paper studies the mechanism of oscillation frequency of low-frequency oscillations on time scale of DC voltage control

and a physical equivalent circuit model of flexible DC distribution system under DC voltage timescale（about 100 ms） is proposed. The analytical form of oscillation frequency is derived

and the influencing factors of low-frequency oscillation are analyzed. Furthermore

the sensitivity of the influencing factors of low-frequency oscillation is analyzed

and a reduced order model is derived

which clarifies the relationship between the oscillation frequency and the key parameters. A simulation model of flexible DC distribution system is built by the PSCAD

and the simulation results verify the correctness and effectiveness of the theoretical analysis.

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