%0 Journal Article
%T 数字控制对并网逆变器的影响及抑制方法<br>Effects of Digital Control on Grid-Connected Inverter and Its Suppression Method
%A 王
%A 萍
%A 王
%A 尉
%A 贝太周
%A 李
%A 楠
%J 天津大学学报（自然科学与工程技术版）
%D 2016
%R 10.11784/tdxbz201406090
%X 从并网逆变器控制性能的比较可知，常规的数字控制不如模拟控制．为此，以常用的准比例谐振电流控制 器为例，采用传统模型、1 阶惯性模型、离散化模型，分析了数字控制采样、零阶保持和滞后一拍对逆变器稳态和 动态性能的影响．得出结论：数字控制使控制器和控制对象特性发生变化，系统阶数由 3 阶升高为 4 阶，相位滞后 增大，开关频率及其整数倍频率出现谐振，并伴随有相位的跳变，控制参数的稳定域缩小；受稳定性的制约，稳态 精度和动态性能也下降，采样频率越低时上述影响越突出．一种基于误差电流衰减的预测控制被提出用于抑制数字 控制的影响．仿真和实验结果表明预测控制能减小稳态误差，动态调节时间由 10 , ms 减少到小于 5 , ms，电感估计标 幺值在 0～1.53 内变化，系统具有良好的鲁棒性．<br>： When the control performance of grid-connected inverter is considered, conventional digital control is not as good as analog control. To explain this phenomenon, the commonly-used quasi proportional resonant current con- troller was discussed as an example. The traditional model, one order inertia model and discrete model were employed to analyze the effects of sampling, zero order holder and one-beat delay control on the steady and dynamic perform- ance of the inverter. Conclusions are as follows: digital control changes characteristics of the controller and the plant; the order of system characteristic equation increases from 3 order to 4 order and the phase lag increases; the amplitude resonance and phase jump arise at the switching frequency and its multiple frequency; the stable region of control pa- rameters reduces; steady-state error becomes larger and dynamic performance declines because of system stability. The above effect becomes more serious when sampling frequency gets lower. A predictive control strategy based on cur- rent-error-attenuation was proposed for suppressing effects of digital control. The simulation and experimental results show the predictive control strategy reduces the steady-state error, dynamic adjustment time decreases from 10 , ms to less than 5 , ms. The system is rather robust when the inductance per-unit changes from 0 to 1.53
%K 数字控制
%K 准比例谐振
%K 并网逆变器
%K 稳定域
%K 预测控制&lt
%K br&gt
%K digital control
%K quasi-proportion resonant
%K grid-connected inverter
%K stable region
%K predictive control
%U http://journals.tju.edu.cn/zrb/oa/darticle.aspx?type=view&id=2016050005