基于Z域D分割法的并网逆变器控制参数多约束可视化设计

研究基于D分割法的并网逆变器控制参数设计方法。考虑并网逆变器数字控制的离散特性,推导Z域D分割法的成立条件,并和S域D分割法进行比较。根据系统的性能要求,利用Z域D分割法得到指定的相位裕度和幅值裕度以及参数鲁棒性要求下调节器参数空间域。在此基础上,以逆变器带宽为目标函数在参数空间域内,通过可视化的方式对控制器参数进行优化设计,该可视化分析方法无需对参数反复试凑,整定目标直观明确。最后通过仿真和实验,证明了该方法的正确性和有效性。

MULTI-CONSTRAINT VISUALIZATION DESIGN OF GRID-CONNECTED INVERTER CONTROL PARAMETERS BASED ON Z-DOMAIN D-PARTITION METHOD

The optimal design method of grid-connected inverter controller parameters based on D-partition method is researched in this paper. Considering the discrete characteristic of digital control, this paper derives the establishment conditions employing D-partition method in Z-domain and compares them with the results derived by using D-partition method in S-domain. According to the performance requirements of the system. The z-domain D-partition method is used to obtain the regulator parameter space domain under the requirement of the expected phase margin and magnitude margin, and the robustness. On this basis, the inverter bandwidth is taken as the objective function to optimize the controller parameters in the parameter space domain. The visualization analysis method does not need repeated trial and error on parameters. Instead, its setting goals are visual and clear. Simulation and experiment prove the correctness and validity of this method.