A Method for Assessing Harmonic Emission Level of Photovoltaic Access Point Considering System-Side Harmonic Voltage Fluctuations

doi:10.11930/j.issn.1004-9649.202003086

Abstract

Abstract: With the extensive application of photovoltaic inverter, the harmonic generated during its operation overlaps with the background harmonic of the system at the access point, which causes harmonic amplification and even resonance problems. It is therefore of great significance for the prevention of harmonic problems to evaluate the harmonic voltage emission level of the access point. Different from the traditional non-linear load, the photovoltaic inverter is connected to the power grid after being filtered by filter, which may cause the PV-side harmonic impedance at the point of common coupling (PCC) not to meet the condition of the traditional power grid that requires the PV-side harmonic impedance to be much greater than the system-side harmonic impedance. At the same time, the continuous access of power electronic equipment leads to a large number of harmonics in the system, and the fluctuation of harmonic voltage increases gradually. Therefore, according to the parameters of photovoltaic inverters and filters and the harmonic impedances of the lines, the photovoltaic-side harmonic impedance is estimated firstly. Secondly, the harmonic voltage and harmonic current data of the PCC are classified according to the logistic regression, and the data sets with basically identical background harmonic voltages are selected. And then the system-side harmonic impedance is estimated using partial least square method, so as to reduce the influence of system-side harmonic voltage fluctuation. Lastly, based on the estimation of photovoltaic-side and system-side harmonic impedance, the harmonic voltage emission level is evaluated. Compared with other methods, the proposed method is proved to be superior and accurate.

Key words: photovoltaic, harmonic impedance, harmonic voltage, harmonic emission level, logistic regression

ZHANG Xu, XU Yonghai, LIU Ziteng, JIANG Haiwei, TAO Shun. A Method for Assessing Harmonic Emission Level of Photovoltaic Access Point Considering System-Side Harmonic Voltage Fluctuations[J]. Electric Power, 2021, 54(3): 109-116.

Add to citation manager EndNote|Ris|BibTeX

URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202003086

https://www.electricpower.com.cn/EN/Y2021/V54/I3/109

References

[1] JAIN S K, SINGH S N. Fast harmonic estimation of stationary and time-varying signals using EA-AWNN[J]. IEEE Transactions on Instrumentation and Measurement, 2013, 62(2): 335-343.
[2] MORADIFAR A, AKBARI FOROUD A, GORGANI FIROUZJAH K. Intelligent localisation of multiple non-linear loads considering impact of harmonic state estimation accuracy[J]. IET Generation, Transmission & Distribution, 2017, 11(8): 1943-1953.
[3] 席晓林, 吴杰, 王宁, 等. 交直流混合微电网中关于纹波的研究[J]. 电力科学与技术学报, 2020, 35(6): 76-82
XI Xiaolin, WU Jie, WANG Ning, et al. Research on ripple in AC/DC hybrid microgrid[J]. Journal of Electric Power Science and Technology, 2020, 35(6): 76-82
[4] 朱武, 刘雅娟. 大型光伏电站谐波谐振机理研究[J]. 中国电力, 2018, 51(3): 121-130
ZHU Wu, LIU Yajuan. Harmonic resonance mechanism study of large-scale photovoltaic power plants[J]. Electric Power, 2018, 51(3): 121-130
[5] 魏伟. 配电网中谐波源检测与谐波发射水平评估研究[D]. 合肥: 合肥工业大学, 2018.
WEI Wei. Detection of harmonic source and evaluation of harmonic emission level in distribution network[D]. Hefei: Hefei University of Technology, 2018.
[6] 邱思语, 杨洪耕. 基于泛正态阻抗云的谐波发射水平估计[J]. 电测与仪表, 2016, 53(15): 89-94,100
QIU Siyu, YANG Honggeng. Assessment method of harmonic emission level based on pan-normal harmonic impedance cloud[J]. Electrical Measurement & Instrumentation, 2016, 53(15): 89-94,100
[7] 张华赢, 朱明星, 时亨通, 等. 对称性和波动性约束的居民负荷谐波发射水平评估[J]. 中国电力, 2020, 53(11): 60-68
ZHANG Huaying, ZHU Mingxing, SHI Hengtong, et al. Assessment on harmonic emission level of residential loads with symmetry and volatility constraints[J]. Electric Power, 2020, 53(11): 60-68
[8] 王攸然, 张逸, 邵振国, 等. 谐波责任划分研究现状及在分布式电源并网条件下的展望[J]. 电工电能新技术, 2019, 38(1): 61-69
WANG Youran, ZHANG Yi, SHAO Zhenguo, et al. Current status of harmonic responsibility division and prospects under grid-connected distributed generations condition[J]. Advanced Technology of Electrical Engineering and Energy, 2019, 38(1): 61-69
[9] 郑涛, 黄予园, 宗伟, 等. 光伏并网系统故障二次谐波产生机理及其对变压器保护的影响[J]. 电力系统保护与控制, 2020, 48(12): 13-22
ZHENG Tao, HUANG Yuyuan, ZONG Wei,et al. Second harmonic generation mechanism of a photovoltaic grid-connected system fault and its influence on transformer protection[J]. Power System Protection and Control, 2020, 48(12): 13-22
[10] 严干贵, 常青云, 黄亚峰, 等. 弱电网接入下多光伏逆变器并联运行特性分析[J]. 电网技术, 2014, 38(4): 933-940
YAN Gangui, CHANG Qingyun, HUANG Yafeng, et al. Analysis on parallel operational characteristics of multi photovoltaic inverters connected to weak-structured power system[J]. Power System Technology, 2014, 38(4): 933-940
[11] 张巍, 杨洪耕. 基于二元线性回归的谐波发射水平估计方法[J]. 中国电机工程学报, 2004(6): 50-53
ZHANG Wei, YANG Honggeng. A method for assessing harmonic emission level based on binary linear regression[J]. Proceedings of the CSEE, 2004(6): 50-53
[12] 黄舜, 徐永海. 基于偏最小二乘回归的系统谐波阻抗与谐波发射水平的评估方法[J]. 中国电机工程学报, 2007(1): 93-97
HUANG Shun, XU Yonghai. Assessing harmonic impedance and the harmonic emission level based on partial least-squares regression method[J]. Proceedings of the CSEE, 2007(1): 93-97
[13] YANG H, PIROTTE P, ROBERT A. Harmonic emission levels of industrial loads statistical assessment[C]// CIGRE Proceedings. Paris: International Council on Large Electric Systems, 1996: 36-306.
[14] 王诗超, 沈沉, 李洋, 等. 基于波动量法的系统侧谐波阻抗幅值估计精度评价方法[J]. 电网技术, 2012, 36(5): 145-149
WANG Shichao, SHEN Chen, LI Yang, et al. A fluctuation quantity based method to evaluate estimation precision of harmonic impedance amplitude at system side[J]. Power System Technology, 2012, 36(5): 145-149
[15] 林顺富, 李扬, 汤波, 等. 基于改进FastICA及偏最小二乘法的系统谐波阻抗估计[J]. 电网技术, 2018, 42(1): 308-314
LIN Shunfu, LI Yang, TANG Bo, et al. System harmonic impedance estimation based on improved fast ICA and partial least squares[J]. Power System Technology, 2018, 42(1): 308-314
[16] 贾秀芳, 华回春, 曹东升, 等. 基于复线性最小二乘法的谐波责任定量划分[J]. 中国电机工程学报, 2013, 33(4): 149-155, 20
JIA Xiufang, HUA Huichun, CAO Dongsheng, et al. Determining harmonic contributions based on complex least squares method[J]. Proceedings of the CSEE, 2013, 33(4): 149-155, 20
[17] 谭鹏, 杨洪耕, 马晓阳, 等. 计及风电场侧谐波阻抗影响的谐波发射水平评估[J]. 电力自动化设备, 2019, 39(4): 167-173
TAN Peng, YANG Honggeng, MA Xiaoyang, et al. Assessment of harmonic emission level considering influence of harmonic impedance of wind farm[J]. Electric Power Automation Equipment, 2019, 39(4): 167-173
[18] 龚华麟, 肖先勇, 刘亚梅, 等. 基于主导波动量筛选原理的用户谐波发射水平估计方法[J]. 中国电机工程学报, 2010, 30(4): 22-27
GONG Hualin, XIAO Xianyong, LIU Yamei, et al. A method for assessing customer harmonic emission level based on the dominant fluctuation filtering principle[J]. Proceedings of the CSEE, 2010, 30(4): 22-27
[19] 汤波, 林顺富, 陈光, 等. 居民配电网负荷谐波电流发射水平评估方法[J]. 电工技术学报, 2018, 33(3): 533-542
TANG Bo, LIN Shunfu, CHEN Guang, et al. The harmonic current emission level of the residential loads in the distribution network[J]. Transactions of China Electrotechnical Society, 2018, 33(3): 533-542
[20] 陈静, 符玲, 臧天磊, 等. 考虑背景谐波波动的谐波责任划分方法[J]. 电力自动化设备, 2016, 36(5): 61-66
CHEN Jing, FU Ling, ZANG Tianlei, et al. Harmonic responsibility determination considering background harmonic fluctuation[J]. Electric Power Automation Equipment, 2016, 36(5): 61-66
[21] 曾雅文. 并网光伏电站仿真建模及逆变器群控方法研究[D]. 北京: 华北电力大学, 2013.
ZENG Yawen. Modeling of grid-connected photovoltaic power plant and research on cluster control of inverter[D]. Beijing: North China Electric Power University, 2013.