双馈风力发电系统DC-link电压振荡抑制策略
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摘要
针对网侧变流器双闭环控制中电压外环对DC-link电压振荡抑制响应慢及电流内环对前馈补偿延时的问题,提出了一种直接控制DC-link电容器充电功率的网侧变流器单闭环控制策略。本策略中引入的前馈补偿直接施加在控制电压的节点上,以及一个跟踪-微分器用于外界扰动动态前馈补偿的获取。在Matlab/Simulink平台中通过两种典型情况研究了所提出的网侧变流器控制策略对DC-link电压振荡抑制的有效性。结果表明,所提出的网侧变流器控制策略能有效抑制DC-link电压的冲击幅值及振荡,提出的前馈补偿方案及跟踪-微分器解决了电流内环对前馈补偿的延时以及经典微分器的噪声放大效应。
Aiming at the problems existing in the double closed-loop control of grid-side converter(GSC),such as slow response of voltage outer loop to the DC-link voltage oscillation suppression and the time delay in feedforward compensation by current inner loop,a GSC single closed-loop control strategy,which directly controls the charging power of DC-link capacitor,is proposed in this paper. Under this strategy,the introduced feedforward compensation is directly applied to the control voltage node;in addition,a tracking-differentiator is used to obtain the dynamic feedforward compensation for external disturbance. On a Matlab/Simulink platform,the effectiveness of the proposed GSC control strategy for the DC-link voltage oscillation suppression is studied in two typical cases. Simulation results show that the novel strategy can effectively suppress the impact amplitude and oscillation of DC-link voltage;moreover,the proposed feedforward compensation scheme and the tracking-differentiator can solve problems including the time delay in feedforward compensation by current inner loop and the noise amplification effect resulting from the classical differentiator.
Aiming at the problems existing in the double closed-loop control of grid-side converter(GSC),such as slow response of voltage outer loop to the DC-link voltage oscillation suppression and the time delay in feedforward compensation by current inner loop,a GSC single closed-loop control strategy,which directly controls the charging power of DC-link capacitor,is proposed in this paper. Under this strategy,the introduced feedforward compensation is directly applied to the control voltage node;in addition,a tracking-differentiator is used to obtain the dynamic feedforward compensation for external disturbance. On a Matlab/Simulink platform,the effectiveness of the proposed GSC control strategy for the DC-link voltage oscillation suppression is studied in two typical cases. Simulation results show that the novel strategy can effectively suppress the impact amplitude and oscillation of DC-link voltage;moreover,the proposed feedforward compensation scheme and the tracking-differentiator can solve problems including the time delay in feedforward compensation by current inner loop and the noise amplification effect resulting from the classical differentiator.
引文
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[9]Hur N,Jung J,Nam K.A fast dynamic DC-link power-balancing scheme for a PWM converter-inverter system[J].IEEE Trans on Industrial Electronics,2001,48(4):794-803.
[10] Yao Jun,Li Hui,Liao Yong,et al. An improved control strategy of limiting the DC-link voltage fluctuation for a doubly fed induction wind generator[J]. IEEE Trans on Power Electronics,2008,23(3):1205-1213.
[11] Guo Baozhu,Han Jingqing,Xi Fubao. Linear tracking-differentiator and application to online estimation of the frequency of a sinusoidal signal with random noise perturbation[J]. International Journal of Systems Science,2002,33(5):351-358.
[12]韩京清,王伟(Han Jingqing,Wang Wei).非线性跟踪-微分器(Nonlinear tracking-differentiator)[J].系统科学与数学(Journal of Systems Science and Mathmatical Sciences),1994,14(2):177-183.
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[3]Morren J,De haan S W H.Ridethrough of wind turbines with doubly-fed induction generator during a voltage dip[J].IEEE Trans on Energy Conversion,2005,20(2):435-441.
[4]Lima F K A,Luna A,Rodriguez P,et al.Rotor voltage dynamics in the doubly fed induction generator during grid faults[J].IEEE Trans on Power Electronics,2010,25(1):118-130.
[5]李培强,邱时严,李欣然,等(Li Peiqiang,Qiu Shiyan,Li Xinran,et al).双馈风力发电系统的滑模变结构控制技术(Sliding mode variable structure control technology used in doubly-fed induction generation system)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(8):29-35.
[6]胡家兵,孙丹,贺益康,等(Hu Jiabing,Sun Dan,He Yikang,et al).电网电压骤降故障下双馈风力发电机建模与控制(Modeling and control of DFIG wind energy generation system under grid voltage dip)[J].电力系统自动化(Automation of Electric Power Systems),2006,30(8):21-26.
[7]Xiang Dawei,Li Ran,Tavner P J,et al.Control of a doubly fed induction generator in a wind turbine during grid fault ride-through[J].IEEE Trans on Energy Conversion,2006,21(3):652-662.
[8]徐海亮,章玮,贺益康,等(Xu Hailiang,Zhang Wei,He Yikang,et al).双馈型风电机组低电压穿越技术要点及展望(A review on low voltage ride-through technologies and prospect for DFIG wind turbines)[J].电力系统自动化(Automation of Electric Power Systems),2013,37(20):8-15.
[9]Hur N,Jung J,Nam K.A fast dynamic DC-link power-balancing scheme for a PWM converter-inverter system[J].IEEE Trans on Industrial Electronics,2001,48(4):794-803.
[10] Yao Jun,Li Hui,Liao Yong,et al. An improved control strategy of limiting the DC-link voltage fluctuation for a doubly fed induction wind generator[J]. IEEE Trans on Power Electronics,2008,23(3):1205-1213.
[11] Guo Baozhu,Han Jingqing,Xi Fubao. Linear tracking-differentiator and application to online estimation of the frequency of a sinusoidal signal with random noise perturbation[J]. International Journal of Systems Science,2002,33(5):351-358.
[12]韩京清,王伟(Han Jingqing,Wang Wei).非线性跟踪-微分器(Nonlinear tracking-differentiator)[J].系统科学与数学(Journal of Systems Science and Mathmatical Sciences),1994,14(2):177-183.