摘要
在并网逆变器的传统控制方式下,占空比通常在下一个载波的波谷处装载,这样带来的滞后一拍的控制延时会严重影响到并网系统的稳定性和动态性。对此,提出了一种快速鲁棒脉宽调制方法,能够有效消除占空比滞后一拍装载带来的控制延时问题。分析了所提方法能够有效降低系统闭环特征方程的阶次,增大系统稳定范围,减少超调量,从而提高了系统的临界稳定性,改善了负荷突变时系统达到稳定状态时的动态性能。最后通过实验验证了所提方法的有效性,实现高质量的并网电流馈入电网。
In the conventional grid-connected inverter control,the duty cycle is only loaded once at the valley of the next carrier,the control system will generate a carrier cycle delay,which will seriously affect the stability and dynamics of the grid-connected system.Aiming at this problem,a fast and robust pulse width modulation method is proposed for this problem,which can completely eliminate the control delay problem caused by the duty cycle lag one-shot loading.It is concluded that the proposed method can effectively reduce the order of the closed-loop characteristic equation of the system,increase the stability range of the system,and reduce the overshoot.Thus,the critical stability of the system is improved,the dynamic performance of the system when the load reaches a sudden state is improved.Finally,the effectiveness of the proposed method is verified through experiments,and high-quality grid-connected current is fed into the grid.
作者
曹志
夏家辉
刘傲洋
张闯
CAO Zhi;XIA Jia-hui;LIU Ao-yang;ZHANG Chuang(College of Electrical Engineering and New Energy,China Three Gorges University,Yichang443002,China;Xiangyang Power Supply Company,State Grid Hubei Electric Power Company Limited,Xiangyang441000,China;Jinmen Power Supply Company,State Grid Hubei Electric Power Company Limited,Jinmen448000,China)
出处
《电力学报》
2020年第3期209-215,260,共8页
Journal of Electric Power
基金
湖北省自然科学基金项目(Z2019240/2019CFB331)
