Active Protection Method for Microgrids Based on Harmonic Current Injection

ZHANG Erjia; YU Moduo; HUANG Wentao; TAI Nengling; RUAN Wenjun; QI Lu

doi:10.7500/AEPS20220303002

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Active Protection Method for Microgrids Based on Harmonic Current Injection

Application Research | 更新时间：2025-06-16

- Active Protection Method for Microgrids Based on Harmonic Current Injection
- Automation of Electric Power Systems Vol. 47, Issue 23, Pages: 172-179(2023)
- 作者机构：
  
  1.电力传输与功率变换控制教育部重点实验室（上海交通大学），上海市 200240
  2.国网江苏省电力有限公司，江苏省南京市 210000
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(52177100);State Grid Corporation of China(5400-202140167A-0-0-00)
- DOI：10.7500/AEPS20220303002
  CLC：
- Received：03 March 2022，
  
  Revised：2022-10-01，
  
  Published Online：30 October 2023，
  
  Published：10 December 2023
- 稿件说明：
移动端阅览
张尔佳,余墨多,黄文焘等.谐波电流注入式微电网主动保护方法[J].电力系统自动化,2023,47(23):172-179.

ZHANG Erjia,YU Moduo,HUANG Wentao,et al.Active Protection Method for Microgrids Based on Harmonic Current Injection[J].Automation of Electric Power Systems,2023,47(23):172-179.
张尔佳,余墨多,黄文焘等.谐波电流注入式微电网主动保护方法[J].电力系统自动化,2023,47(23):172-179. DOI： 10.7500/AEPS20220303002.

ZHANG Erjia,YU Moduo,HUANG Wentao,et al.Active Protection Method for Microgrids Based on Harmonic Current Injection[J].Automation of Electric Power Systems,2023,47(23):172-179. DOI： 10.7500/AEPS20220303002.

摘要

微电网内逆变型分布式电源（IIDG）渗透率不断提高，导致微电网故障特征不明显、功率流向复杂，保护整定困难，传统保护方案需要借助高速通信系统分析不同节点电气量提取故障信息。文中提出了一种谐波电流注入式的微电网主动保护方案，在故障时利用IIDG主动注入谐波，实现了无通信条件下的故障检测信息的传递，解决了双向潮流、过渡电阻、运行方式变化带来的保护整定困难问题。通过电流内环谐波叠加控制实现IIDG向微电网主动注入谐波电流，基于IIDG端口等效阻抗变化计算结果调制注入谐波幅值，通过调整谐波幅值和频率实现不同节点故障信息传递。基于区域内、外不同频率谐波分量差异明显的特征，构建了基于IIDG的谐波电流量比值的保护判据，根据谐波潮流方向提出开闭锁逻辑。在PSCAD/EMTDC中建立了实际工程微电网模型，仿真验证了该方案在不同故障情况下的有效性、选择性与速动性。

Abstract

The increasing penetration rate of inverter interfaced distributed generator (IIDG) in microgrids has led to unclear fault characteristics

complex power flow

and difficulty in protection setting. Traditional protection schemes require the use of high-speed communication systems to analyze the electrical quantities of different nodes and extract fault information. A harmonic current injection based active protection scheme for microgrids is proposed

which utilizes IIDG to actively inject harmonics during faults

achieving the transmission of fault detection information without communication

and solving the difficulty in protection setting caused by bidirectional power flow

transition resistance and changes in operating mode. By controlling the superposition of harmonics in the current inner loop

IIDG actively injects harmonic current into the microgrid. Based on the calculation results of the equivalent impedance change of the IIDG port

the amplitude of the injected harmonics is modulated. By adjusting the amplitude and frequency of harmonics

the fault information transmission at different nodes is achieved. Based on the characteristics of significant differences in harmonic components at different frequencies within and outside the region

a protection criterion based on the ratio of harmonic current of IIDG is constructed

and an open/close logic is proposed based on the direction of harmonic flow. A practical engineering microgrid model is established in PSCAD/EMTDC

and the effectiveness

selectivity

and rapidity of the scheme under different fault conditions are verified through simulation.

关键词

Keywords

references

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