一种工程化检测次同步和超同步相量的方法
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摘要
针对工程现场检测次(超)同步分量频谱分辨率稀疏的现状,文中总结现有算法工程应用的不适应性,提出快速傅里叶算法(fast fourier transformation,FFT)计算的工程化方法。首先结合低通滤波及FFT数据窗长度来消除频谱混叠的影响,再通过FFT计算结果的递减特性来消除基波频谱泄露对谐波计算的干扰,最后运用FFT修正算法消除栅栏效应的影响以准确计算次(超)同步振荡谐波的频率与幅值,同时根据FFT频谱幅值的极值出现次数来区分幅值突变的运行工况。以此为基础开发的监控装置能够满足电网次(超)同步振荡准确监控的功能要求。
In view of the fact that the spectral resolution of the sub( super) synchronous component of the engineering site is sparse,this paper summarizes the inadaptability of the existing algorithm engineering application and proposes an engineering method of FFT calculation. The effect of spectral aliasing is first eliminated by combining the low-pass filter and the FFT data window length,and then eliminating the interference of fundamental frequency spectrum leakage to harmonic calculation through the decreasing characteristic of FFT calculation results. Finally,using the FFT correction algorithm to eliminate the influence of the fence effect to accurately calculate the frequency and amplitude of sub( super) synchronous oscillation harmonics. Meanwhile,according to the FFT spectrum amplitude of the number of extreme occurrences to distinguish between the sudden changes in the operating conditions of the amplitude,as a basis for the development of monitoring devices to meet the grid sub( super) synchronous oscillation of the precise monitoring of functional requirements.
In view of the fact that the spectral resolution of the sub( super) synchronous component of the engineering site is sparse,this paper summarizes the inadaptability of the existing algorithm engineering application and proposes an engineering method of FFT calculation. The effect of spectral aliasing is first eliminated by combining the low-pass filter and the FFT data window length,and then eliminating the interference of fundamental frequency spectrum leakage to harmonic calculation through the decreasing characteristic of FFT calculation results. Finally,using the FFT correction algorithm to eliminate the influence of the fence effect to accurately calculate the frequency and amplitude of sub( super) synchronous oscillation harmonics. Meanwhile,according to the FFT spectrum amplitude of the number of extreme occurrences to distinguish between the sudden changes in the operating conditions of the amplitude,as a basis for the development of monitoring devices to meet the grid sub( super) synchronous oscillation of the precise monitoring of functional requirements.
引文
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[14]王茂海,孙元章.基于DFT的电力系统相量及功率测量新算法[J].电力系统自动化,2005,29(2):20-24.WANG Maohai,SUN Yuanzhang.A DFT-based for phasor and power measurement in power systems[J].Automation of Electric Power Systems,2005,29(2):20-24.
[15]王茂海,齐霞.电力系统次同步振荡分量的快速在线检测算法[J].电力系统自动化,2016,40(18):149-154.WANG Maohai,QI Xia.Fast online detection method for power system sub-synchronous oscillation component[J].Automation of Electric Power Systems,2016,40(18):149-154.
[16]谢小荣,王银,刘华坤,等.电力系统次同步和超同步谐波相量的检测方法[J].电力系统自动化,2016,40(21):199-194.XIE Xiaorong,WANG Yin,LIU Huakun,et al.Detection method for sub-synchronous harmonic phasors in power pystem[J].Automation of Electric Power Systems,2016,40(18):199-194.
[17]黄迪山.FFT相位误差分析及实用修正方法[J].振动工程学报,1994,7(2):185-189.HUANG Dishan.Analysis on phase error in FFT and a pratical approach method[J].Journal of Vibration Engineering,1994,7(2):185-189.
[18]杨煜,黎小林,邓晶,等.贵广Ⅱ回直流次同步振荡抑制措施的录波数据分析[J].南方电网技术,2013,7(3):21-24.YANG Yu,LI Xiaolin,DENG Jing,et al.Analysis on the recording data of countermeasures for subsynchornous oscillation of Guizhou-GuangdongⅡHVDC System[J].Southern Power System Technology,2013,7(3):21-24.
[2]赖联有,许伟坚.基于零相位误差滤波的局部放电故障识别[J].电力工程技术,2018,37(3):67-71.LAI Lianyou,XU Weijian.Recognition of partial discharge faults using zero phase error filtering[J].Electric Power Engineering Teachnology,2018,37(3):67-71.
[3]MOHAMMAD A,MARTA M.Understanding the origin of oscillatory phenomena observed between wind farms and HVDC systems[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2017,5(1):378-392.
[4]张东辉,谢小荣,刘世宇,等.串补输电系统中次同步谐振的模态阻尼推导[J].电力系统自动化,2008,32(6):5-8.ZHANG Donghui,XIE Xiaorong,LIU Shiyu,et al.Modal damping of subsynchronous oscillation on compensated transmission systems[J].Automation of Electric Power Systems,2008,32(6):5-8.
[5]徐梅梅,徐玉韬,白加林,等.串补电容引起的次同步谐振对距离保护的影响[J].南方电网技术,2015,9(2):84-90.XU Meimei,XU Yutao,BAI Jialin,et al.Influence of series compensation capacitor cause subsynchronous resonance on distance protection[J].Southern Power System Technology,2015,9(2):84-90.
[6]周前,张潮,张宁宇,等.2018年多直流馈入江苏规划电网连锁换相失败分析[J].电力工程技术,2018,37(1):51-57.ZHOU Qian,ZHANG Chao,ZHANG Ningyu,et al.Analysis on commutation failures in multi-infeed HVDC system in planning power grid of Jiangsu in 2018[J].Electric Power Engineering Teachnology,2018,37(1):51-57.
[7]王亮,谢小荣,姜齐荣,等.大规模双馈风电场次同步谐振的分析与抑制[J].电力系统自动化,2014,38(22):26-31.WANG Liang,XIE Xiaorong,JIANG Qirong,et al.Analysis and mitigation of SSR problems in large-scale wind farms with doubly-fed wind turbines[J].Automation of Electric Power Systems,2014,38(22):26-31.
[8]KHALED M A,YASSER A I M,WILSUN X.Modeling,analysis,and suppression of the impact of full-scale wind-power converters on subsynchronous damping[J].IEEE Systems Journal,2013,7(4):700-712.
[9]朱旭凯,周孝信,田芳,等.基于本地测量信号的TCSC抑制次同步振荡附加控制[J].电力系统自动化,2011,35(23):22-25.ZHU Xukai,ZHOU Xiaoxin,TIAN Fang,et al.Supplementary damping control of TCSC for subsynchronous oscillation based on local measured signal[J].Automation of Electric Power Systems,2011,35(23):22-25.
[10]鹿建成,李啸骢,黄维,等.基于SSSC和励磁协调抑制次同步振荡的线性最优控制器设计[J].电力系统保护与控制,2015,43(1):21-27.LU Jiancheng,LI Xiaocong,HUANG Wei,et al.Linear optimal controller of static series synchronous compensator and excitation to suppress sub-synchronous oscillation[J].Power System Protection and Control,2015,43(1):21-27.
[11]刘超,蒋东翔,谢小荣,等.次同步振荡引发的发电机组轴系疲劳损伤[J].电力系统自动化,2010,34(15):19-22.LIU Chao,JIANG Dongxiang,XIE Xiaorong,et al.Fatigue damage of turbine generator shafting caused by subsynchornous oscillations[J].Automation of Electric Power Systems,2010,34(15):19-22.
[12]李安娜,吴熙,蒋平,等.基于形态滤波和Prony算法的低频振荡模式辨识的研究[J].电力系统保护与控制,2015,43(3):137-142.LI Anna,WU Xi,JIANG Ping,et al.Research on identifying low frequency oscillation modes based on morphological filtering theory and Prony algorithm[J].Power System Protection and Control,2015,43(3):137-142.
[13]马仁政,陈明凯.减少频谱泄露的一种自适应采样算法[J].电力系统自动化,2002,26(7):55-58.MA Renzheng,CHEN Mingkai.An adaptive sampling algorithm for reducing spectrum leakage[J].Automation of Electric Power Systems,2002,26(7):55-58.
[14]王茂海,孙元章.基于DFT的电力系统相量及功率测量新算法[J].电力系统自动化,2005,29(2):20-24.WANG Maohai,SUN Yuanzhang.A DFT-based for phasor and power measurement in power systems[J].Automation of Electric Power Systems,2005,29(2):20-24.
[15]王茂海,齐霞.电力系统次同步振荡分量的快速在线检测算法[J].电力系统自动化,2016,40(18):149-154.WANG Maohai,QI Xia.Fast online detection method for power system sub-synchronous oscillation component[J].Automation of Electric Power Systems,2016,40(18):149-154.
[16]谢小荣,王银,刘华坤,等.电力系统次同步和超同步谐波相量的检测方法[J].电力系统自动化,2016,40(21):199-194.XIE Xiaorong,WANG Yin,LIU Huakun,et al.Detection method for sub-synchronous harmonic phasors in power pystem[J].Automation of Electric Power Systems,2016,40(18):199-194.
[17]黄迪山.FFT相位误差分析及实用修正方法[J].振动工程学报,1994,7(2):185-189.HUANG Dishan.Analysis on phase error in FFT and a pratical approach method[J].Journal of Vibration Engineering,1994,7(2):185-189.
[18]杨煜,黎小林,邓晶,等.贵广Ⅱ回直流次同步振荡抑制措施的录波数据分析[J].南方电网技术,2013,7(3):21-24.YANG Yu,LI Xiaolin,DENG Jing,et al.Analysis on the recording data of countermeasures for subsynchornous oscillation of Guizhou-GuangdongⅡHVDC System[J].Southern Power System Technology,2013,7(3):21-24.