This study aims to propose a novel effective modular multilevel inverter (MMI) with improved performance parameters. The improved performance parameters are switch reduction, harmonic reduction, and grid synchronization. The reductive design of MMI includes three bidirectional switches and eight unilateral switches to generate a symmetrical nine‐level output, while the same configuration can create a 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, and 31‐level output with asymmetric DC sources. The developed structure requires H‐bride for the generation of positive and negative levels. Reduction in switch count reduces the losses of the MMI and increases the efficiency of the MMI. The selective harmonic elimination technique gives pulses to the proposed design and for the computation of switching angles, Harris hawk's optimization (HHO) is used. Moreover, as an application point of view, the proposed photovoltaic (PV) fed MMI is connected to the grid. A closed‐loop control system is implemented for the PV fed MMI in which the gains of the PI controllers are tuned using the particle swarm optimization, firefly, and HHO‐based controller. The proposed system is simulated and experimentally validated on a laboratory prototype of PV (1 kWp) grid‐connected MMI. The performance of the proposed structure under steady‐state and dynamic conditions are investigated using simulation and experimental setup.

中文翻译：

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具有改进性能参数的模块化多电平逆变器的电网集成

这项研究旨在提出一种具有改进性能参数的新型有效模块化多电平逆变器（MMI）。改进的性能参数是开关减少，谐波减少和电网同步。MMI的简化设计包括三个双向开关和八个单边开关，以产生对称的九电平输出，而相同的配置可以创建11、13、15、17、19、21、23、25、27、29和具有非对称直流电源的31电平输出。发达的结构需要氢溴酸产生正负水平。减少开关数量可减少MMI的损耗并提高MMI的效率。选择性谐波消除技术为提出的设计提供了脉冲，并且为了计算开关角度，使用了哈里斯·霍克最优化（HHO）。此外，从应用角度来看，建议的光伏（PV）馈电MMI连接到电网。为PV馈送的MMI实施了一个闭环控制系统，其中使用粒子群优化，萤火虫和基于HHO的控制器对PI控制器的增益进行了调整。拟议的系统在PV（1 kWp）并网MMI的实验室原型上进行了仿真和实验验证。使用仿真和实验装置研究了该结构在稳态和动态条件下的性能。拟议的系统在PV（1 kWp）并网MMI的实验室原型上进行了仿真和实验验证。使用仿真和实验装置研究了该结构在稳态和动态条件下的性能。拟议的系统在PV（1 kWp）并网MMI的实验室原型上进行了仿真和实验验证。使用仿真和实验装置研究了该结构在稳态和动态条件下的性能。