为研究新型电力系统下的次同步振荡稳定性受参数影响的敏感性问题,针对LCL型滤波器的光伏并网系统,考虑静止无功发生器（SVG）的影响,基于阻抗分析法,建立弱电网下含SVG的光伏并网系统的阻抗模型,分析在弱电网下SVG装置对系统次同步振荡影响,研究系统稳定性受参数影响的敏感性问题。由理论分析与仿真结果表明,在一定参数范围内,SVG对系统的次同步振荡具有抑制作用,且SVG电抗器参数的数值减小时会增强抑制效果;减小SVG电流环比例系数会导致SVG抑制振荡的效果变差,甚至可能引起更严重的振荡;而增大积分系数可增强SVG的抑制效果,但调整范围不宜过大;随着电网强度增大,SVG仍能产生良好的抑制次同步振荡效果,电网强度减弱时,SVG抑制振荡的效果也会减弱,但仍具有抑制能力。
Abstract
In order to study the sensitivity of sub-synchronous oscillation stability affected by parameters for the new power system, the influence of static var generator （SVG） is considered for the photovoltaic grid-connected system with LCL filter. Based on the impedance analysis method, the impedance model of photovoltaic grid-connected system with SVG under weak grid is established. The influence of SVG device on sub-synchronous oscillation of system under weak grid is analyzed, and the sensitivity of system stability to parameters is studied. The theoretical analysis and simulation results show that SVG can suppress the sub-synchronous oscillation of the system within a certain parameter range, and the suppression effect will be enhanced when the parameter value of SVG reactor is reduced. In addition,reducing the proportion coefficient of SVG current loop will lead to the worse effect of SVG on suppressing oscillation, and may even cause more serious oscillation. Increasing the integral coefficient can enhance the suppression effect of SVG, but the adjustment range should not be too large. Furthermore, with the increase of power grid strength, SVG can still produce a good effect of suppressing sub-synchronous oscillation. When the power grid strength is weakened, the effect of SVG on suppressing oscillation will also be weakened, but it still has the ability to suppress.
关键词
光伏并网 /
弱电网 /
次同步振荡 /
LCL型滤波器 /
静止无功发生器 /
阻抗分析法
Key words
photovoltaic grid-connected /
weak grid /
sub-synchronous oscillation /
LCL filter /
static var generator /
impedance analysis method
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参考文献
[1] WANG L, XIE X R, JIANG Q R, et al.Investigation of SSR in practical DFIG-based wind farms connected to a series-compensated power system[J]. IEEE transactions on power systems, 2015, 30(5): 2772-2779.
[2] 李明节, 于钊, 许涛, 等. 新能源并网系统引发的复杂振荡问题及其对策研究[J]. 电网技术, 2017, 41(4): 1035-1042.
LI M J, YU Z, XU T, et al.Study of complex oscillation caused by renewable energy integration and its solution[J]. Power system technology, 2017, 41(4): 1035-1042.
[3] 刘其辉, 高瑜, 郭天飞, 等. 风电并网系统阻抗稳定性分析及次同步振荡因素研究[J]. 太阳能学报, 2022, 43(1): 89-100.
LIU Q H, GAO Y, GUO T F, et al.Research on impedance stability analysis and subsynchronous oscillation factors of wind power grid-connected system[J]. Acta energiae solaris sinica, 2022, 43(1): 89-100.
[4] 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 S Q, LI R, GAO B F, 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.
[5] 周林, 任伟, 廖波, 等. 并网型光伏电站无功电压控制[J]. 电工技术学报, 2015, 30(20): 168-175.
ZHOU L, REN W, LIAO B, et al.Reactive power and voltage control for grid-connected PV power plants[J]. Transactions of China Electrotechnical Society, 2015, 30(20): 168-175.
[6] 张前进, 周林, 李海啸, 等. 考虑SVG补偿装置的大型光伏并网系统振荡分析与抑制[J]. 中国电机工程学报, 2019, 39(9): 2636-2644.
ZHANG Q J, ZHOU L, LI H X, et al.Oscillation analysis and suppression of large-scale grid-connected photovoltaic system considering SVG equipment[J]. Proceedings of the CSEE, 2019, 39(9): 2636-2644.
[7] 张前进. 无功补偿下大型光伏并网系统不稳定机理及抑制策略研究[D]. 重庆: 重庆大学, 2020.
ZHANG Q J.Research on instability mechanism and suppression of large scale grid connected photovoltaic (PV) system under reactive power compensation[D]. Chongqing: Chongqing University, 2020.
[8] 丁明, 王伟胜, 王秀丽, 等. 大规模光伏发电对电力系统影响综述[J]. 中国电机工程学报, 2014, 34(1): 1-14.
DING M, WANG W S, WANG X L, et al.A review on the effect of large-scale PV generation on power systems[J]. Proceedings of the CSEE, 2014, 34(1): 1-14.
[9] 张艺. 考虑静止无功发生器的光伏电站的次同步振荡问题研究[D]. 武汉: 华中科技大学, 2020.
ZHANG Y.Study on subsynchronous oscillation of photovoltaic power station equipped with SVG[D]. Wuhan: Huazhong University of Science and Technology, 2020.
[10] 于永军, 张艺, 黄碧月, 等. 考虑SVG的光伏电站次同步振荡问题[J]. 高电压技术, 2021, 47(8): 2720-2730.
YU Y J, ZHANG Y, HUANG B Y, et al.Research on subsynchronous oscillation of photovoltaic power station equipped with SVG[J]. High voltage engineering, 2021, 47(8): 2720-2730.
[11] 宋宣锋. 逆变器并网系统振荡稳定性研究[D]. 徐州: 中国矿业大学, 2020.
SONG X F.Study on the oscillation stability of grid-connected inverter system[D]. Xuzhou: China University of Mining and Technology, 2020.
[12] YAN G G, WAN Q, JIA Q, et al.Analysis of SSO characteristics of D-PMSGs based wind farm under weak AC system[C]//2018 2nd IEEE Conference on Energy Internet and Energy System Integration (EI2). Beijing, China, 2018: 1-6.
[13] 胡鹏, 艾欣, 肖仕武, 等. 静止无功发生器序阻抗建模及对次同步振荡影响因素的分析[J]. 电工技术学报, 2020, 35(17): 3703-3713.
HU P, AI X, XIAO S W, et al.Sequence impedance of static var generator and analysis of influencing factors on subsynchronous oscillation[J]. Transactions of China Electrotechnical Society, 2020, 35(17): 3703-3713.
[14] SUN J.Small-signal methods for AC distributed power systems-a review[J]. IEEE transactions on power electronics, 2009, 24(11): 2545-2554.
[15] 付子义, 张字远, 董彦杰. 弱电网条件下LCL型三相光伏并网逆变器研究[J]. 太阳能学报, 2021, 42(4): 193-199.
FU Z Y, ZHANG Z Y, DONG Y J.LCL type three-phase photovoltaic grid-connected inverter under week grid conditions[J]. Acta energiae solaris sinica, 2021, 42(4): 193-199.
[16] VIETO I, SUN J.Impedance modeling of doubly-fed induction generators[C]//2015 17th European Conference on Power Electronics and Applications (EPE’15 ECCE-Europe). Geneva, Switzerland, 2015: 1-10.
[17] CESPEDES M, SUN J.Impedance modeling and analysis of grid-connected voltage-source converters[J]. IEEE transactions on power electronics, 2014, 29(3): 1254-1261.
[18] 刘宇明, 黄碧月, 孙海顺, 等. SVG与直驱风机间的次同步相互作用特性分析[J]. 电网技术, 2019, 43(6): 2072-2079.
LIU Y M, HUANG B Y, SUN H S, et al.Study on subsynchronous interaction between D-PMSG-based wind turbines and SVG[J]. Power system technology, 2019, 43(6): 2072-2079.
[19] 杨思为, 张兴, 毛旺, 等. 弱电网下级联H桥光伏并网逆变器稳定性分析[J]. 太阳能学报, 2022, 43(1): 398-405.
YANG S W, ZHANG X, MAO W, et al.Stability analysis of CHB photovoltaic grid-connected inverter in weak grid[J]. Acta energiae solaris sinica, 2022, 43(1): 398-405.
[20] CHEN X, SUN J.Characterization of inverter-grid interactions using a hardware-in-the-loop system test-bed[C]//8th International Conference on Power Electronics-ECCE Asia. Jeju, Korea (South), 2011: 2180-2187.
[21] 王赟程, 陈新, 陈杰, 等. 基于谐波线性化的三相LCL型并网逆变器正负序阻抗建模分析[J]. 中国电机工程学报, 2016, 36(21): 5890-5898.
WANG Y C, CHEN X, CHEN J, et al.Analysis of positive-sequence and negative-sequence impedance modeling of three-phase LCL-type grid-connected inverters based on harmonic linearization[J]. Proceedings of the CSEE, 2016, 36(21): 5890-5898.
基金
国家电网公司总部科技项目（5100-202136562A-0-5-SF）
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