逆变器是强的非线性系统，它通常具有复杂动力学现象，例如跨临界分岔，倍周期分岔等，它会大大增加输出电流的谐波含量，降低变换器的效率，使其发生振荡乃至崩溃。目前大多数混沌控制存在建模困难，控制效果不明显，稳定性不强的缺点。针对此，提供了一种全新的混沌抑制方式，即改进余弦延时反馈控制（improved cosine delay feedback control ,ICDFC）。该方式先使用被控对象的输出量和自身延时一个周期的差值作为反馈量，该反馈量再经过余弦函数环节和反馈控制参数之后得到控制信号，并将该控制信息以反馈形式直接作用到被控对象中。同时构建系统频闪映射模型并寻求系统的Jacobian矩阵和平衡点，最后基于朱里判据给出了反馈控制参数的限定条件。为说明所提出混沌控制方法的优越性，开展了大量的仿真模拟实验，并与指数延时反馈控制进行比较，结果表明，ICDFC能更有效的抑制逆变器的混沌行为，且大大增加了系统运行的稳定域。
Abstract
Inverter is a strong nonlinear system, it generally has sophisticated nonlinear dynamical behaviors, for instance transcritical bifurcation, period doubling bifurcation, etc, it will greatly increased the harmonic component of the output current, decrease the efficiency rate of the convertor, make it oscillate and even collapse. At present, most of chaos control has the disadvantages of modeling difficulty, control effect is not obvious and stability is not strong. To solve this problem, a new chaos suppression method, namely improved cosine delay feedback control (ICDFC), is proposed. In this method, the difference value between the export variable of the controlled object and itself time delay of one period is first used as the feedback quantity, which then passes through the cosine function and feedback control parameters to obtain the controlling message, after that the controlling message is directly reaction on the controlled subject in feedback forms. In the meantime, establishing system’s stroboscopic mapping model, seeking the Jacobin matrices and balance points of the controlled object. At last, the restrictive conditions of the feedback controlling parameter is presented based on the July criterion. To illustrate the superiority of the suggested chaotic control method, a great deal of simulating experiments were unfolded, and compared with exponential delayed feedback control which proves that ICDFC can not only suppress the chaotic behavior of the inverter more effectively, but also largely increases system operational stable region.
关键词
单相H桥光伏逆变器 /
非线性动力学行为 /
混沌控制 /
改进余弦延时反馈控制
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Key words
Single-phase H-bridge pv inverter /
nonlinear dynamics behavior /
chaotic control /
improvement cosinoidal delayed feedback control
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