该文以新能源送出线路为研究对象,通过研究新能源故障控制方法,提升距离保护在新能源电力系统中的适应性。首先,分析过渡电阻和逆变器控制对于距离保护的影响机理。然后,提出新能源故障控制策略,主动调整新能源输出特性,使故障附加阻抗呈纯阻性。接着通过利用有效故障阻抗、测量阻抗及故障附加阻抗在阻抗复平面中的关系,求解有效故障阻抗,以提升距离保护在新能源系统中的耐过渡电阻能力。最后,利用Matlab/Simulink仿真验证所提方法的有效性,为新能源送出线的保护与控制协调配合提供了理论基础。
Abstract
In this paper, the transmission line is taken as the research object, and the new energy fault control method is studied to improve the adaptability of distance protection in the new energy power system. Firstly, the influence mechanism of fault resistance and inverter control on distance protection is analyzed. Then, a new energy fault control strategy is proposed to adjust the output characteristics of new energy actively so that the fault supplementary impedance is converted to pure resistance. Then, the trigonometric relationship among measured impedance, effective fault impedance and fault supplementary impedance is derived from the impedance complex plane, and the effective fault impedance is obtained, so as to improve the fault resistance capability of distance protection in the new energy system. Finally, MATLAB/Simulink simulation is used to verify the effectiveness of the proposed method, which provides a theoretical basis for the coordination of the protection and control of the new energy transmission line.
关键词
新能源 /
送出线路 /
控制策略 /
距离保护 /
过渡电阻
Key words
new energy /
transmission line /
control theory /
distance protection /
transition resistance
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 李彦宾, 贾科, 毕天姝, 等. 逆变型电源对距离保护的影响机理分析[J]. 电力系统保护与控制, 2018, 46(16): 54-59.
LI Y B, JIA K, BI T S, et al.Impact inverter inter-faced renewable energy generators on distance protection[J]. Power system protection and control, 2018, 46(16): 54-59.
[2] BANAIEMOQADAM A, HOOSHYAR A, AZZOUZ M A.A control-based solution for distance protection of lines connected to converter-interfaced sources during asymmetrical faults[J]. IEEE transactions on power delivery, 2020, 35(3): 1455-1466.
[3] 黄少锋, 曹凯, 罗澜. 一种消除过渡电阻影响的阻抗测量方法[J]. 电力系统自动化, 2013, 37(23): 108-113.
HUANG S F, CAO K, LUO L.Integrated modeling and model maintenance of on-line monitoring system in substation[J]. Automation of electric power systems, 2013, 37(23): 108-113.
[4] 马伟, 黄晓波, 吴旻昊, 等. 一种抗过渡电阻的阻抗测量改进方案[J]. 电网技术, 2020, 44(3): 1134-1139.
MA W, HUANG X B, WU M H.An improved scheme of impedance measurement against transition resistance[J]. Power system technology, 2020, 44(3): 1134-1139.
[5] 苗常海, 杨东升, 寇健. 基于负序电压前馈的非对称故障下低电压穿越控制方法研究[J]. 太阳能学报, 2018, 39(4): 1149-1155.
MIAO C H, YANG D S, KOU J.Research of low voltage ride through control strategy based on negative sequence voltage feedforward under unsymmetrical fault[J]. Acta energiae solaris sinica, 2018, 39(4): 1149-1155.
[6] GUO W M, MU L H, ZHANG X.Fault models of inverter-interfaced distributed generators within a low-voltage microgrid[J]. IEEE transactions on power delivery, 2017, 32(1): 453-461.
[7] 潘国清, 曾德辉, 王钢, 等. 含PQ控制逆变型分布式电源的配电网故障分析方法[J]. 中国电机工程学报, 2014, 34(4): 555-561.
PAN G Q, ZENG D H, WANG G, et al.Fault analysis on distribution network with inverter interfaced distributed generations based on PQ control strategy[J]. Proceedings of the CSEE, 2014, 34(4): 555-561.
[8] GUO X Q, LIU W Z, LU Z G.Flexible power regulation and current-limited control of the grid-connected inverter under unbalanced grid voltage faults[J]. IEEE Transactions on industrial electronics, 2017, 64(9): 7425-7432.
[9] 施佳斌, 季亮, 常潇, 等. 不对称电压跌落下考虑场景区分的逆变型分布式电源控制策略研究[J]. 电力系统保护与控制, 2020, 48(20): 9-17.
SHI J B, JI L, CHANG X, et al.Control strategy for inverter-interfaced distributed generation during unbalanced voltage sag considering scenario classification[J]. Power system protection and control, 2020, 48(20): 9-17.
[10] KABIRI R, HOLMES D G, MCGRATH B P.Control of active and reactive power ripple to mitigate unbalanced grid voltages[J]. IEEE transactions on industry applications, 2016, 52(2): 1660-1668.
[11] 李彦宾, 贾科, 毕天姝, 等. 电流差动保护在逆变型新能源场站送出线路中的适应性分析[J]. 电力系统自动化, 2017, 41(12): 100-105.
LI Y B, JIA K, BI T S, et al.Adaptability analysis of current differential protection of outgoing transmission line emanating from inverter-interfaced renewable energy power plants[J]. Automation of electric power systems, 2017, 4(12): 100-105.
[12] VON MEIER A, STEWART E, MCEACHERN A, et al.Precision micro-synchrophasors for distribution systems:A summary of applications[J]. IEEE transactions on smart grid, 2017, 8(6): 2926-2936.
[13] 于淼, 汤亚芳, 黄亦欣, 等. 双馈风机控制方式对继电保护影响的研究[J]. 电力系统保护与控制, 2020, 48(2): 180-187.
YU M, TANG Y F, HUANG Y X, et al.Research on the influence of control mode of DFIG on relay protection[J]. Power system protection and control, 2020, 48(2): 180-187.
PDF(1988 KB)
