Mechanism of Forced Subsynchronous Oscillation of Large-Scale Photovoltaic Power Generation Grid-Connected System with Series Compensation Tranmmission Lines

doi:10.16183/j.cnki.jsjtu.2021.415

Abstract

Abstract:

There exists the subsynchronous oscillation (SSO) instability risk in large-scale photovoltaic(PV) grid-connected systems with series compensation, which is generally explained by the negative damped oscillation theory. In this paper, the inter-photovoltaic harmonics due to maximum power point tracking (MPPT) control are used as the disturbance source and the large-scale PV grid-connected system with series compensation as the forced system. The forced oscillation theory is used to reveal the SSO mechanism of PV power generation based on the interaction between the perturbed MPPT and the series compensation grid-connected system, and verified in the PSCAD/EMTDC simulation platform. The results show that the perturbed MPPT-based PV inverter outputs interharmonic currents to the system due to the modulation coupling on the AC-DC side, which may lead to serious forced SSO problems when the interharmonic frequency is close to the frequency of inherent weakly damped mode of the system, causing a shock to the system stability. The simulation results verify the correctness of the proposed theory.

Key words: photovoltaic(PV), interharmonic, subsynchronous oscillation(SSO), forced oscillation

CLC Number:

TM721

LIN Yong, KANG Jiale, YU Hao, CHEN Honglin, YANG Yanji, CHEN Wuhui. Mechanism of Forced Subsynchronous Oscillation of Large-Scale Photovoltaic Power Generation Grid-Connected System with Series Compensation Tranmmission Lines[J]. Journal of Shanghai Jiao Tong University, 2022, 56(9): 1118-1127.

Figures/Tables 11

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References 25

[1]	OLIVA A R, BALDA J C. A PV dispersed generator: A power quality analysis within the IEEE 519[J]. IEEE Transactions on Power Delivery, 2003, 18(2): 525-530. doi: 10.1109/TPWRD.2003.809685 URL
[2]	HAKIMI S, HAJIZADEH A. Integration of photovoltaic power units to power distribution system through modular multilevel converter[J]. Energies, 2018, 11(10): 2753. doi: 10.3390/en11102753 URL
[3]	KATIRAEI F, AGÜERO J R. Solar PV integration challenges[J]. IEEE Power and Energy Magazine, 2011, 9(3): 62-71. doi: 10.1109/MPE.2011.940579 URL
[4]	ZHONG Q, FENG J J, LIN L X, et al. Graphical presentation of harmonic operating principles in voltage source converter with sparse vector methods[J]. IET Generation, Transmission & Distribution, 2017, 11(4): 1033-1038. doi: 10.1049/iet-gtd.2016.1307 URL
[5]	LI C. Unstable operation of photovoltaic inverter from field experiences[J]. IEEE Transactions on Power Delivery, 2018, 33(2): 1013-1015. doi: 10.1109/TPWRD.2017.2656020 URL
[6]	SOLANICS P, KOZMINSKI K, BAJPAI M, et al. The impact of large steel mill loads on power generating units[J]. IEEE Transactions on Power Delivery, 2000, 15(1): 24-30. doi: 10.1109/61.847224 URL
[7]	YACAMINI R. Power system harmonics. part 4: Interharmonics[J]. Power Engineering Journal, 1996, 10(4): 185-193. doi: 10.1049/pe:19960411 URL
[8]	CHEN W H, YU X, HAN X Q, et al. Analysis of forced SSOs excited by subsynchronous interharmonics from DPMSG-based wind farms[J]. IEEE Transactions on Sustainable Energy, 2021, 12(2): 978-989. doi: 10.1109/TSTE.2020.3028578 URL
[9]	DU Y, LU D D C, JAMES G, et al. Modeling and analysis of current harmonic distortion from grid connected PV inverters under different operating conditions[J]. Solar Energy, 2013, 94: 182-194. doi: 10.1016/j.solener.2013.05.010 URL
[10]	DU Y, LU D D C, CHU G M L, et al. Closed-form solution of time-varying model and its applications for output current harmonics in two-stage PV inverter[J]. IEEE Transactions on Sustainable Energy, 2015, 6(1): 142-150. doi: 10.1109/TSTE.2014.2360616 URL
[11]	SANGWONGWANICH A, YANG Y H, SERA D, et al. Analysis and modeling of interharmonics from grid-connected photovoltaic systems[J]. IEEE Transactions on Power Electronics, 2018, 33(10): 8353-8364. doi: 10.1109/TPEL.2017.2778025 URL
[12]	SANGWONGWANICH A, YANG Y H, SERA D, et al. Interharmonics from grid-connected PV systems: Mechanism and mitigation[C]// 2017 IEEE 3rd International Future Energy Electronics Conference and ECCE Asia. Taiwan, China: IEEE, 2017: 722-727.
[13]	LANGELLA R, TESTA A, DJOKIC S Z, et al. On the interharmonic emission of PV inverters under different operating conditions[C]// 2016 17th International Conference on Harmonics and Quality of Power. Belo Horizonte, Brazil: IEEE, 2016: 733-738.
[14]	LANGELLA R, TESTA A, MEYER J, et al. Experimental-based evaluation of PV inverter harmonic and interharmonic distortion due to different operating conditions[J]. IEEE Transactions on Instrumentation and Measurement, 2016, 65(10): 2221-2233. doi: 10.1109/TIM.2016.2554378 URL
[15]	PAKONEN P, HILDEN A, SUNTIO T, et al. Grid-connected PV power plant induced power quality problems—Experimental evidence[C]// 2016 18th European Conference on Power Electronics and Applications (EPE’16 ECCE Europe) Karlsruhe, Germany: IEEE, 2016: 1-10.
[16]	RAVINDRAN V, RÖNNBERG S K, BUSATTO T, et al. Inspection of interharmonic emissions from a grid-tied PV inverter in North Sweden[C]// 2018 18th International Conference on Harmonics and Quality of Power. Ljubljana, Slovenia: IEEE, 2018: 1-6.
[17]	赵书强, 李忍, 高本锋, 等. 光伏并入弱交流电网次同步振荡机理与特性分析[J]. 中国电机工程学报, 2018, 38(24): 7215-7225.
	ZHAO Shuqiang, LI Ren, GAO Benfeng, et al. Analysis of mechanism and characteristics in sub synchronous oscillation between PV and weak AC networks[J]. Proceedings of the CSEE, 2018, 38(24): 7215-7225.
[18]	姜齐荣, 王玉芝. 电力电子设备高占比电力系统电磁振荡分析与抑制综述[J]. 中国电机工程学报, 2020, 40(22): 7185-7201.
	JIANG Qirong, WANG Yuzhi. Overview of the analysis and mitigation methods of electromagnetic oscillations in power systems with high proportion of power electronic equipment[J]. Proceedings of the CSEE, 2020, 40(22): 7185-7201.
[19]	贾祺, 严干贵, 李泳霖, 等. 多光伏发电单元并联接入弱交流系统的稳定性分析[J]. 电力系统自动化, 2018, 42(3): 14-20.
	JIA Qi, YAN Gangui, LI Yonglin, et al. Stability analysis of multiple parallelled photovoltaic power generation units connected to weak AC system[J]. Automation of Electric Power Systems, 2018, 42(3): 14-20.
[20]	LU G F, MIAO M, YU X, et al. Impact of series compensation on operation performance of large-scale PV plants[J]. The Journal of Engineering, 2017(13): 2569-2573.
[21]	LI F, HUANG Y, WU F, et al. Research on clustering equivalent modeling of large-scale photovoltaic power plants[J]. Chinese Journal of Electrical Engineering, 2018, 4(4): 80-85.
[22]	ZHAO S Q, LI R, GAO B F, et al. Subsynchronous oscillation of PV plants integrated to weak AC networks[J]. IET Renewable Power Generation, 2019, 13(3): 409-417. doi: 10.1049/iet-rpg.2018.5659
[23]	YAN G G, CAI Y R, JIA Q, et al. Stability analysis and operation control of photovoltaic generation system connected to weak grid[C]// 2017 IEEE Conference on Energy Internet and Energy System Integration. Beijing, China: IEEE, 2017: 1-6.
[24]	HUANG H Q, MAO C X, LU J M, et al. Small-signal modeling and analysis of grid-connected photovoltaic generation systems[J]. Proceedings of the CSEE, 2012, 32(22): 7-14.
[25]	FEMIA N, PETRONE G, SPAGNUOLO G, et al. Optimization of perturb and observe maximum power point tracking method[J]. IEEE Transactions on Power Electronics, 2005, 20(4): 963-973. doi: 10.1109/TPEL.2005.850975 URL

设备数量	电压等级	变压器			输电线路
设备数量	电压等级	漏电抗(p.u.)	励磁电流/%	额定容量/(MV·A)	电压等级/kV	线路阻抗(p.u.)
i=4	0.48 kV/35 kV	0.065	0.65	1	330	Z₁=0.039+j0.297
m=3	35 kV/330 kV	0.140	0.44	240	750	Z₂=0.015+j0.196
n’=200	330 kV/750 kV	0.150	0.10	500

电流控制参数	直流电压控制参数	锁相环参数	交流侧滤波器
k_p1= k_p2=0.5	k_p3=3.5	k_p4=50	L_f=0.6 mH
k_i1= k_i2=12.5	k_i3=285	k_i4=10000	R_f=0.5 Ω C_f=35 μF

模式	特征值		f/Hz	ζ /%
λ_1,2	-389.420±	j6906.484	1099.200	5.630
λ_3,4	-391.137±	j6293.558	1001.651	6.203
λ_5,6	-0.898±	j313.284	49.861	0.287
λ_7,8	-6.670±	j61.992	9.866	10.698
λ_9,10	-0.079±	j3.272	0.521	2.438
λ₁₁	-807.660		-	-
λ₁₂	-792.464		-	-
λ₁₃	-25.803		-	-
λ₁₄	-25.758		-	-