电源学报

PQ扰动型电网阻抗估计方法的误差分析与改进策略

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凌子涵中国电源学会学生会员 , 许津铭中国电源学会高级会员 , 宗林中国电源学会学生会员 , 刁韩旭中国电源学会学生会员 , 谢少军中国电源学会高级会员

电源学报 | 新能源系统 2025,23(4): 163-172

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电源学报 |新能源系统 2025 , 23 (4) : 163 -172

PQ扰动型电网阻抗估计方法的误差分析与改进策略

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凌子涵（2000—　），男，中国电源学会学生会员，硕士研究生。研究方向：新能源并网逆变器稳定性分析及控制。E-mail：zhling@nuaa.edu.cn。

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宗林（2000—　），男，中国电源学会学生会员，硕士研究生。研究方向：新能源并网逆变器稳定性分析及控制。E-mail：17312418298@163.com。

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宗林（2000—　），男，中国电源学会学生会员，硕士研究生。研究方向：新能源并网逆变器稳定性分析及控制。E-mail：17312418298@163.com。

刁韩旭（2001—　），男，中国电源学会学生会员，硕士研究生。研究方向：构网型变流器建模及稳定性分析。E-mail：diaohanxu@nuaa.edu.cn。

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刁韩旭（2001—　），男，中国电源学会学生会员，硕士研究生。研究方向：构网型变流器建模及稳定性分析。E-mail：diaohanxu@nuaa.edu.cn。

谢少军（1969—　），男，中国电源学会高级会员，博士，教授。研究方向：功率电子变换技术和航空电源系统。E-mail：eeac@nuaa.edu.cn。

"}, bioImg=null, bioContent=

谢少军（1969—　），男，中国电源学会高级会员，博士，教授。研究方向：功率电子变换技术和航空电源系统。E-mail：eeac@nuaa.edu.cn。

凌子涵中国电源学会学生会员, 许津铭中国电源学会高级会员, 宗林中国电源学会学生会员, 刁韩旭中国电源学会学生会员, 谢少军中国电源学会高级会员

作者信息

南京航空航天大学自动化学院，南京　211106

通讯作者:

许津铭（1987—　），男，中国电源学会高级会员，通信作者，博士，副教授。研究方向：新能源并网发电技术及电力电子化电力系统。E-mail：xjinming01@163.com。

作者简介:

凌子涵（2000—　），男，中国电源学会学生会员，硕士研究生。研究方向：新能源并网逆变器稳定性分析及控制。E-mail：zhling@nuaa.edu.cn。

宗林（2000—　），男，中国电源学会学生会员，硕士研究生。研究方向：新能源并网逆变器稳定性分析及控制。E-mail：17312418298@163.com。

刁韩旭（2001—　），男，中国电源学会学生会员，硕士研究生。研究方向：构网型变流器建模及稳定性分析。E-mail：diaohanxu@nuaa.edu.cn。

谢少军（1969—　），男，中国电源学会高级会员，博士，教授。研究方向：功率电子变换技术和航空电源系统。E-mail：eeac@nuaa.edu.cn。

Error Analysis and Improvement Strategy for Grid Impedance Estimation Method Based on PQ Variation

Zihan LING Student Member, CPSS, Jinming XU Senior Member, CPSS, Lin ZONG Student Member, CPSS, Hanxu DIAO Student Member, CPSS, Shaojun XIE Senior Member, CPSS

Affiliations

College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

出版时间: 2025-07-30 doi: 10.13234/j.issn.2095-2805.2025.4.163

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摘要

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电网阻抗对并网逆变器稳定性存在严重影响，准确的电网阻抗估计有助于实现弱电网下并网逆变器高性能自适应控制。PQ扰动法是1种典型电网阻抗在线估计方法，但是，研究表明，电网阻抗真实值与估计值之间存在非线性函数关系，影响电网阻抗估计结果。传统PQ扰动法由于忽略了扰动前后稳态工作点变化的影响，在电网阻抗估计准确度方面存在不足。因此，从固定相角差的误差补偿和基于离线查表的估计值修正2个角度出发，分别提出2种计及工作点变化的改进方案，实现弱电网下电网阻抗的准确估计。详细理论分析和测试结果表明，所提电网阻抗估计方法较传统PQ扰动法在电网阻抗估计准确度方面有较大提升。

关键词

并网逆变器 / 弱电网 / 电网阻抗估计 / 锁相环

Abstract

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The grid impedance exerts a serious impact on the stability of grid-tied inverters, and its accurate estimation is conducive to realizing the high-performance adaptive control of grid-tied inverters in weak grid conditions. The PQ variation method is a typical method of online grid impedance estimation. However, research shows that there exists a relationship of nonlinear function between real grid impedances and their estimation results, which may affect the estimation results. The traditional PQ variation method has shortcomings in the grid impedance estimation accuracy due to ignoring the influence of steady-state operating point fluctuations before and after the variation. Therefore, from the two aspects of error compensation with fixed phase-angle difference and estimation value correction with offline look-up table, two improved estimation schemes considering the operating point fluctuations are proposed respectively to achieve an accurate grid impedance estimation under weak grid conditions. The detailed theoretical analysis and test results show that compared with the traditional PQ variation method, the proposed grid impedance estimation method can achieve a higher degree of accuracy.

Key words

Grid-tied inverter / weak grid / grid impedance estimation / phase-locked loop

引用本文

凌子涵中国电源学会学生会员, 许津铭中国电源学会高级会员, 宗林中国电源学会学生会员, 刁韩旭中国电源学会学生会员, 谢少军中国电源学会高级会员. PQ扰动型电网阻抗估计方法的误差分析与改进策略. 电源学报, 2025 , 23 (4) : 163 -172 . DOI: 10.13234/j.issn.2095-2805.2025.4.163

Zihan LING, Jinming XU, Lin ZONG, Hanxu DIAO, Shaojun XIE. Error Analysis and Improvement Strategy for Grid Impedance Estimation Method Based on PQ Variation[J]. Journal of Power Supply, 2025 , 23 (4) : 163 -172 . DOI: 10.13234/j.issn.2095-2805.2025.4.163

基金

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国家自然科学基金资助项目(52277184)

参考文献

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2025年第23卷第4期

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文章信息

doi: 10.13234/j.issn.2095-2805.2025.4.163

接收时间：2024-03-22
首发时间：2026-10-26
出版时间：2025-07-30

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收稿日期：2024-03-22
修回日期：2024-06-07
录用日期：2024-06-18

基金

National Natural Science Foundation of China(52277184)

国家自然科学基金资助项目(52277184)

作者信息

南京航空航天大学自动化学院，南京　211106

通讯作者:

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https://castjournals.cast.org.cn/joweb/dyxb/CN/10.13234/j.issn.2095-2805.2025.4.163

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2种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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