基于间接延时法的单相并网逆变器矢量控制策略

由于单相并网逆变器系统缺少一个自由度,无法直接将静止同步坐标系中的交流量转换为基于dq坐标系下的直流量。采用直接将实际物理量延时1量,严重影响了系统动态响应特性和增加了系统复杂性。针对该问题提出了一种基于间接延时构建正交虚拟量的方法,首先将真实物物理量延时一个很小的时间度,再将所得到的延时量与真实物理量作为输入量推导出所需要的正交虚拟量。该方法采用一个很小的延时替代1统的动态响应特性。最后,通过Matlab仿真验证了该方法的有效性和正确性。

Vector Control for Single-phase Grid-connected Inverter Based on Indirect Time-Delay Method

Since the single-phase grid-connected inverter system lacks a degree of freedom,it is impossible to directly convert the amount of AC in the static synchronous coordinate system to the amount of DC based on the dq coordinate system.The virtual orthogonal variable obtained by directly transforming the actual physical quantity by 1 cycle and the introduction of complex algorithm,which seriously affects the dynamic response characteristics of the system and increases the system complexity.In this paper,a method based on indirect delay to construct orthogonal virtual quantity is proposed.Firstly,the real physical quantity is delayed by a small time,and then,the obtained delay quantity and real physical quantity are used as input quantity to deduce the required orthogonal virtual quantity.The method uses a small delay to replace 1 which greatly improves the dynamic response characteristics of the system.Finally,the effectiveness and correctness of the proposed method are verified by Matlab simulation.