基于基波阻抗辨识的短路比测量方法 *

doi:10.11985/2019.02.002

电气工程学报 ›› 2019, Vol. 14 ›› Issue (2): 7-11.doi: 10.11985/2019.02.002

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基于基波阻抗辨识的短路比测量方法 ^*

陈巧地,张兴,李明,刘晓玺,郭梓暄

合肥工业大学电气与自动化工程学院合肥 230009

收稿日期:2019-05-05 出版日期:2019-06-25 发布日期:2019-10-25
作者简介:陈巧地,男,1994年生,硕士研究生。主要研究方向为弱电网下并网逆变器的稳定性。E-mail：1845183643@qq.com;|张兴,男,1963年生,博士,教授。主要研究方向为新能源发电。E-mail：hongLf@ustc.edu.cn
基金资助:
* 国家重点研发计划资助项目(2016YFB0900300)

Short Circuit Ratio Measurement Method Based on Fundamental Impedance Detection

CHEN Qiaodi,ZHANG Xing,LI Ming,LIU Xiaoxi,GUO Zixuan

School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009 China

Received:2019-05-05 Online:2019-06-25 Published:2019-10-25

摘要/Abstract

摘要：

随着新能源、无功补偿等电力电子设备的大量接入,交流电网系统不断变弱,分析交流并网系统的稳定性、精确度量交流并网系统的强度十分重要。短路比(SCR)作为衡量并网系统强度的一个重要因素,提出了一种基于基波阻抗辨识的短路比测量方法。首先,针对传统阻抗辨识实时性差、精度低的问题,提出了一种基于递归离散傅里叶变换的谐波提取方法,进而计算基波阻抗。其次,以两台逆变器并网系统为例,提出短路比测量方案。最后通过仿真和试验验证了测量方法的合理性和有效性。

关键词: 基波阻抗, 递归离散傅里叶变换, 并网系统强度, 短路比

Abstract:

：More and more renewable energy generators and reactive power compensation devices are connected to AC power systems, which make AC grid systems weaker and weaker, so it is important to measure the strength of AC grid systems and analyze stability of the systems. Short circuit ratio (SCR) plays an important role in measuring the strength of systems. A method of short circuit ratio measurement based on fundamental impedance detection is established. Firstly, aiming at the problem of poor real-time performance and low accuracy of traditional impedance identification, a recursive discrete Fourier transform based harmonic extraction method is proposed to calculate fundamental impedance. Secondly, taking the grid-connected system of two inverters as an example, a short-circuit ratio measurement scheme is proposed. Finally, the rationality and validity of the measurement method are verified by simulation and experiment.

Key words: Fundamental impedance, recursive discrete Fourier transform, grid-connected system strength, short circuit ratio

中图分类号:

TM464

陈巧地,张兴,李明,刘晓玺,郭梓暄. 基于基波阻抗辨识的短路比测量方法 ^*[J]. 电气工程学报, 2019, 14(2): 7-11.

CHEN Qiaodi,ZHANG Xing,LI Ming,LIU Xiaoxi,GUO Zixuan. Short Circuit Ratio Measurement Method Based on Fundamental Impedance Detection[J]. Journal of Electrical Engineering, 2019, 14(2): 7-11.

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算法类型	RDFT	DFT
复乘次数	N	N 2
复加次数	2N	N(N-1)
响应速度	快	慢
单次谐波检测	能	能

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基于基波阻抗辨识的短路比测量方法 ^*

Short Circuit Ratio Measurement Method Based on Fundamental Impedance Detection

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