基于占空比预测与零极点结合的LCL型逆变器延时补偿方法

发布时间：2018-05-21 12:22

  本文选题：数字控制 + 数字延时　； 参考：《电力系统自动化》2017年18期

【摘要】：LCL型并网逆变器数字控制中延时环节对系统稳定性的影响不可忽略。分析发现,网侧电流数字单环鲁棒性不足,需要采用额外的有源阻尼方法增强阻尼,但传统的数字电容电流反馈有源阻尼方法带来了内环数字延时,使电容电流内环等效虚拟电阻不再保持纯电阻特性,增大了系统保持稳定的难度,因此提出一种预测占空比结合零极点补偿控制延时的方法。通过预测控制算法得到占空比和增加零极点,有效地补偿了系统数字延时,消除了采样计算等产生的一拍延时和零阶保持器产生的半拍延时,使系统在有源阻尼方法下能有效地起到增强阻尼的作用。算法设计简单,系统稳定性加强。仿真和实验验证了所提方法的有效性和可行性。
[Abstract]:The effect of delay on system stability in digital control of LCL grid-connected inverter can not be ignored. It is found that the robustness of the grid-side current digital single loop is insufficient, and the additional active damping method is needed to enhance the damping. However, the traditional digital capacitive current feedback active damping method brings the digital delay of the inner loop. The equivalent virtual resistance of the capacitor current inner loop is no longer pure resistance, which makes it more difficult to maintain the stability of the system. Therefore, a method of predictive duty cycle combined with zero pole compensation control delay is proposed. By using predictive control algorithm to obtain duty cycle and increase zero pole, the digital delay of the system is compensated effectively, and the beat delay caused by sampling calculation and the half-beat delay produced by zero order holdout are eliminated. The system can effectively enhance the damping under the active damping method. The algorithm is simple and the stability of the system is enhanced. The effectiveness and feasibility of the proposed method are verified by simulation and experiments.
【作者单位】： 湘潭大学信息工程学院;
【基金】：国家自然科学基金资助项目(51577162) 湖南省自然科学基金资助项目(14JJ5007) 湖南省教育厅重点科研项目(17A129)~~
【分类号】：TM464
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本文编号：1919166