300 Mvar调相机继电保护的分析与改进
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摘要
介绍了已投运300 Mvar调相机的启动特点、运行特点以及继电保护配置方案。分析了调相机启机时的谐波特性对调相机保护的影响,在此基础上对调相机保护在启机及并网运行过程中的状态闭锁逻辑进行了讨论,给出了调相机保护的状态闭锁配置。鉴于频率跟踪在调相机保护中的重要性,根据启机过程中的谐波特性、变频特性,在过零点测频算法中增加了低通滤波、过零点抖动甄别,并进行了仿真和实验验证,结果表明防干扰处理后的过零点测频在保证精度与响应速度的同时,抗干扰性能良好。
The start-up characteristics,operating characteristics and relay protection configuration scheme of 300 Mvar synchronous condenser that has been put into operation are introduced. The influence of the harmonic characteristics during the start-up process on the synchronous condenser protection is analyzed,based on which,the blocking logic of the synchronous condenser protection during the process of start-up and grid-connection operation is discussed,and the state blocking configuration of the synchronous condenser protection is proposed. In view of the importance of frequency tracking in the synchronous condenser protection,according to the harmonic characteristics and frequency conversion characteristics in the start-up process,the low-pass filtering and zero-crossing jitter discrimination are added in the frequency measurement methods. The simulation and experimental verification show that the zero-crossing frequency measurement after anti-interference processing can not only guarantee the accuracy and response speed,but also have good anti-interference performance.
The start-up characteristics,operating characteristics and relay protection configuration scheme of 300 Mvar synchronous condenser that has been put into operation are introduced. The influence of the harmonic characteristics during the start-up process on the synchronous condenser protection is analyzed,based on which,the blocking logic of the synchronous condenser protection during the process of start-up and grid-connection operation is discussed,and the state blocking configuration of the synchronous condenser protection is proposed. In view of the importance of frequency tracking in the synchronous condenser protection,according to the harmonic characteristics and frequency conversion characteristics in the start-up process,the low-pass filtering and zero-crossing jitter discrimination are added in the frequency measurement methods. The simulation and experimental verification show that the zero-crossing frequency measurement after anti-interference processing can not only guarantee the accuracy and response speed,but also have good anti-interference performance.
引文
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[11] 陈俊,司红建,周荣斌,等.抽水蓄能机组SFC 系统保护关键技术[J].电力自动化设备,2013,33(8):167-171.CHEN Jun,SI Hongjian,ZHOU Rongbin,et al.Key technologies of SFC system protection for pumped storage hydro unit[J].Electric Power Automation Equipment,2013,33(8):167-171.
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[13] 潘仁秋,何其伟,陈俊.大型调相机的保护配置及其实现[J].江苏电机工程,2011,30(6):45-47.PAN Renqiu,HE Qiwei,CHEN Jun.Implementation of protection configuration for large-scale synchronous compensator[J].Jiangsu Electrical Engineering,2011,30(6):45-47.
[2] 李新年,易俊,李柏青,等.直流输电系统换相失败仿真分析及运行情况统计[J].电网技术,2012,36(6):266-271.LI Xinnian,YI Jun,LI Baiqing,et al.Simulation analysis and operation statistics of commutation failure in HVDC transmission system[J].Power System Technology,2012,36(6):266-271.
[3] 屠竞哲,张健,王建明,等.大规模直流异步互联系统受端故障引发送端稳定破坏的机理分析[J].中国电机工程学报,2015,35(21):5492-5499.TU Jingzhe,ZHANG Jian,WANG Jianming,et al.Mechanism ana-lysis on the sending-side instability caused by the receiving-side contingencies of large-scale HVDC asynchronous interconnected power systems[J].Proceedings of the CSEE,2015,35(21):5492-5499.
[4] 张开宇,崔勇,庄侃沁,等.加装同步调相机对多直流馈入受端电网的影响分析[J].电力系统保护与控制,2017,45(22):139-143.ZHANG Kaiyu,CUI Yong,ZHUANG Kanqin,et al.Analysis of the influence of synchronous condensers on receiving-end grid with multi-infeed HVDC[J].Power System Protection and Control,2017,45(22):139-143.
[5] 王潇,周平,王洋,等.大容量调相机静止变频器起动方式研究[J].电气技术,2016,17(10):31-35.WANG Xiao,ZHOU Ping,WANG Yang,et al.Bushing PD analysis and electric field simulation large capacity synchronous compensator[J].Electrical Engineering,2016,17(10):31-35.
[6] 邹东霞,余锐,聂娟红,等.300 Mvar大型同步调相机的启动及继电保护[J].电力系统保护与控制,2016,44(20):160-164.ZOU Dongxia,YU Rui,NIE Juanhong,et al.SFC start and relay pro-tection of 300 Mvar large synchronous condenser[J].Power System Protection and Control,2016,44(20):160-164.
[7] 吴崇昊,陆于平,饶丹.用时域连续有限冲激响应滤波器进行过零测频的方法[J].电网技术,2007,31(7):18-21.WU Chonghao,LU Yuping,RAO Dan.An zero-crossing frequency measuring method using time-domain continuous finite impulse response filter[J].Power System Technology,2007,31(7):18-21.
[8] 李一泉,何奔腾.一种基于傅氏算法的高精度测频方法[J].中国电机工程学报,2006,26(2):78-81.LI Yiquan,HE Benteng.A high-accuracy algorithm for measuring fre-quency of power system based on Fourier filter[J].Proceedings of the CSEE,2006,26(2):78-81.
[9] 吴梓亮,李银红,李明.一种基于修正相角差的傅氏测频算法[J].电力系统保护与控制,2015,43(13):111-117.WU Ziliang,LI Yinhong,LI Ming.Fourier frequency measurement algorithm based on modified phasor angle difference[J].Power System Protection and Control,2015,43(13):111-117.
[10] 张义辉,尹项根,陈德树.基于富氏滤波测频算法的改进研究[J].电网技术,1998,22(3):65-67.ZHANG Yihui,YIN Xianggen,CHEN Deshu.Study on improved algorithm for frequency measurement based on Fourier filter[J].Power System Technology,1998,22(3):65-67.
[11] 陈俊,司红建,周荣斌,等.抽水蓄能机组SFC 系统保护关键技术[J].电力自动化设备,2013,33(8):167-171.CHEN Jun,SI Hongjian,ZHOU Rongbin,et al.Key technologies of SFC system protection for pumped storage hydro unit[J].Electric Power Automation Equipment,2013,33(8):167-171.
[12] 罗凌,李振文,宋兴荣.大容量调相机继电保护配置方案研究[J].湖南电力,2016,36(5):26-30.LUO Ling,LI Zhenwen,SONG Xingrong.Study on the relay protection scheme of high-capacity synchronous condenser[J].Hunan Electric Power,2016,36(5):26-30.
[13] 潘仁秋,何其伟,陈俊.大型调相机的保护配置及其实现[J].江苏电机工程,2011,30(6):45-47.PAN Renqiu,HE Qiwei,CHEN Jun.Implementation of protection configuration for large-scale synchronous compensator[J].Jiangsu Electrical Engineering,2011,30(6):45-47.