含分频风电的电力系统机电暂态计算方法以及暂态特性分析
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摘要
对含分频风电的电力系统机电暂态计算方法以及暂态特性进行了分析。首先,建立了交交变频器的准稳态模型,该模型反映了暂态过程中变频器两侧的电压、功率关系。其次,提出了含分频风电的电力系统暂态稳定算法。该算法将交交变频器准稳态模型与低频、工频两侧的网络方程相连得到系统网络代数方程。同时,利用交替迭代法对系统微分—代数方程组进行求解。最后,对含分频风电的电力系统的暂态稳定特性进行了分析。分析结果表明,由于低频侧电抗仅为工频系统1/3左右,故障时低频风力发电机转速响应的阻尼高于同距离的工频系统。同时,当低频侧故障时交交变频器对工频侧发电机的振荡具有明显的抑制作用。
The electromechanical transient characteristics of a power system with fractional frequency wind power system(FFWPS)are analyzed.Firstly,a quasi-steady state model of the cycloconverter is established,which describes the relationship of voltages,active power and reactive power between the two sides of the cycloconverter during the transient process.Secondly,the calculation method is proposed to analyze the transient stability of the power system with FFWPS.This method combines the quasi-state equations of the cycloconverter and the network equations on both sides.Then these simultaneous equations are solved with the alternating iterative method.Thirdly,the transient stability of the power with FFWPS is analyzed,the results show that the damping of the rotating speed of a faulted wind generator in the fractional frequency system is bigger than that in the industrial frequency system.Moreover,when a fault occurs at the low frequency side,the cycloconverter can effectively restrain the oscillation of the generators at the industrial frequency system.This work is supported by National Natural Science Foundation of China(No.51307136).
The electromechanical transient characteristics of a power system with fractional frequency wind power system(FFWPS)are analyzed.Firstly,a quasi-steady state model of the cycloconverter is established,which describes the relationship of voltages,active power and reactive power between the two sides of the cycloconverter during the transient process.Secondly,the calculation method is proposed to analyze the transient stability of the power system with FFWPS.This method combines the quasi-state equations of the cycloconverter and the network equations on both sides.Then these simultaneous equations are solved with the alternating iterative method.Thirdly,the transient stability of the power with FFWPS is analyzed,the results show that the damping of the rotating speed of a faulted wind generator in the fractional frequency system is bigger than that in the industrial frequency system.Moreover,when a fault occurs at the low frequency side,the cycloconverter can effectively restrain the oscillation of the generators at the industrial frequency system.This work is supported by National Natural Science Foundation of China(No.51307136).
引文
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[4]朱卫平,王秀丽,王锡凡.变速变频风力发电系统最优风能捕获运行方式[J].电力系统自动化,2009,33(11):94-99.ZHU Weiping,WANG Xiuli,WANG Xifan.Optimal wind power capturing operational mode of a variable-speed variablefrequency wind power generation system[J].Automation of Electric Power Systems,2009,33(11):94-99.
[5]ZHU Weiping,WANG Xiuli,WANG Xifan.Optimal power control of fraction frequency wind-power generation system considering the transmission and transformation equipment[C]//Asia-Pacific Power and Energy Engineering Conference,March 28-31,2010,Chengdu,China:1-5.
[6]滕予非,王锡凡,邓敏.分频输电系统变频器桥臂不导通故障及相关问题[J].电力系统自动化,2008,32(7):69-72.TENG Yufei,WANG Xifan,DENG Min.Cycloconverter nonconduction fault and related problem in fractional frequency transmission systems[J].Automation of Electric Power Systems,2008,32(7):69-72.
[7]滕予非,王锡凡,宁联辉,等.分频输电系统交-交变频器触发脉冲实时生成方法[J].电力系统自动化,2010,34(23):76-81.TENG Yufei,WANG Xifan,NING Lianhui,et al.A real-time control pulse generating method for cycloconverter in fractional frequency transmission system[J].Automation of Electric Power Systems,2010,34(23):76-81.
[8]WANG Xifan,CAO Chengun,ZHOU Zhichao.Experiment on fractional frequency transmission system[J].IEEE Trans on Power Systems,2006,21(1):372-377.
[9]宁联辉,王锡凡,滕予非,等.风力发电经分频输电接入系统的实验[J].中国电机工程学报,2011,31(21):9-16.NING Lianhui,WANG Xifan,TENG Yufei,et al.Experiment on wind power grid integration via fractional frequency transmission system[J].Proceedings of the CSEE,2011,31(21):9-16.
[10]TENG Yufei,WANG Xifan.Three-phase short-circuit fault on the lower frequency bus of cycloconverter in FFTS[C]//2009IEEE/PES Power Systems Conference and Exposition,March 15-18,2009,Seattle,USA:1-5.
[11]王锡凡,方万良,杜正春.现代电力系统分析[M].北京:科学出版社,2006.
[12]PELLY B R.Thyristor phase-controlled converters and cycloconverters[M].New York,USA:Wiley,1971.
[13]宋卓彦,王锡凡,陶伟龙,等.基于永磁直驱同步风电机组的分频海上风电系统控制策略[J].电力系统自动化,2014,38(11):27-33.SONG Zhuoyan,WANG Xifan,TAO Weilong,et al.Control strategy for PMSG based wind turbines in fractional frequency offshore wind power system[J].Automation of Electric Power Systems,2014,38(11):27-33.
[14]曹娜,于群,戴慧珠.恒速风电机组极限切除时间的确定[J].电力自动化设备,2008,28(7):17-20.CAO Na,YU Qun,DAI Huizhu.Estimation of critical clearing time of constant speed wind turbines[J].Electric Power Automation Equipment,2008,28(7):17-20.