光伏参与抑制电力系统区间振荡的无功控制策略研究
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摘要
针对大规模光伏并网对系统区间低频振荡可能产生的负面影响,研究了基于无功控制的光伏抑制系统区间振荡的控制策略。建立光伏并网模型,采用向控制输入点注入高斯伪随机信号的方式辨识出系统的降阶传递函数,根据留数指标对反馈信号进行选择,选择留数幅值最大的信号作为阻尼控制器的输入信号,参考电力系统稳定器的超前-滞后结构,采用留数法对阻尼控制器的各参数进行整定。以四机两区域系统为算例,搭建相应的光伏并网模型,通过时域仿真表明:所提出的基于无功控制的光伏附加阻尼控制器对于系统区间振荡具有较好的抑制效果。
Aiming at possible negative impact of large-scale grid connected photovoltaic system on the low frequency oscillation of the system, this paper researched the control strategy of interval oscillation based on reactive power control for photovoltaic suppression system interval oscillation. The photovoltaic grid connected model was established, and the reduced order transfer function of the system was identified by injecting Gauss pseudo-random signal into the control input point. According to the residue index, the feedback signal was selected,and the residual signal of the maximum amplitude was chosen as the input signal of the damping controller. Referring to the lead lag structure of the power system stabilizer, the residue method was used to adjust the parameters of the damping controller. With the four machine two area system as an example, the corresponding photovoltaic grid connected model was built. The time domain simulation shows that the proposed photovoltaic additional damping controller based on reactive power control has a better suppression effect on the system interval oscillation.
Aiming at possible negative impact of large-scale grid connected photovoltaic system on the low frequency oscillation of the system, this paper researched the control strategy of interval oscillation based on reactive power control for photovoltaic suppression system interval oscillation. The photovoltaic grid connected model was established, and the reduced order transfer function of the system was identified by injecting Gauss pseudo-random signal into the control input point. According to the residue index, the feedback signal was selected,and the residual signal of the maximum amplitude was chosen as the input signal of the damping controller. Referring to the lead lag structure of the power system stabilizer, the residue method was used to adjust the parameters of the damping controller. With the four machine two area system as an example, the corresponding photovoltaic grid connected model was built. The time domain simulation shows that the proposed photovoltaic additional damping controller based on reactive power control has a better suppression effect on the system interval oscillation.
引文
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[14]KUNDUR P.Power system stability and control[M].New York:McGraw-Hill Inc,1994.
[2]姚强.电力系统低频振荡及其抑制方式的研究与仿真[J].电工电气,2010(12):1-6.
[3]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.
[4]杨为,高研,徐宁舟,等.新能源发电技术的分析[J].电工电气,2009(4):1-5.
[5]钱金法,王雅萍,钱惠祥.光伏产业的发展与分析[J].电工电气,2009(1):1-4.
[6]龙源,李国杰,程林,等.利用光伏发电系统抑制电网功率振荡的研究[J].电网技术,2006,30(24):44-49.
[7]周林,任伟,余希瑞.大型光伏电站抑制低频振荡的有功阻尼控制策略[J].中国电机工程学报,2016,36(11):2987-2995.
[8]SHAH R,MITHULANANTHAN N,LEE K Y,et al.Widearea measurement signal-based stabiliser for large-scale photovoltaic plants with high variability and uncertainty[J].IET Renewable Power Generation,2013,7(6):614-622.
[9]SHAH R,MITHULANANTHAN N,LEE K Y.Largescale PV plant with a robust controller considering power oscillation damping[J].IEEE Transactions on Energy Conversion,2013,28(1):106-116.
[10]DASH P P,KAZERANI M.Dynamic modeling and performance analysis of a grid-connected current-source inverter-based photovoltaic system[J].IEEE Transactions on Sustainable Energy,2011,2(4):443-450.
[11]苏建徽,余世杰,赵为,等.硅太阳电池工程用数学模型[J].太阳能学报,2001,22(4):409-412.
[12]王越,王念春,时斌.太阳能光伏电池阵列仿真模型的研究[J].电工电气,2009(10):20-22.
[13]李啸骢,陈葆超,徐俊华,等.加速功率型电力系统稳定器整定方法研究[J].电力系统保护与控制,2015,43(17):63-68.
[14]KUNDUR P.Power system stability and control[M].New York:McGraw-Hill Inc,1994.