In this paper, a generalized algorithm is proposed to balance the DC-link (DCL) voltage across each power cell of n number of cascaded H-bridge multilevel inverter (CHBMLI), using dc-dc converter, fed from multi solar photovoltaic (SPV) array for standalone application under varying environmental conditions, i.e. variation in radiation and temperature. Due to variation in the environmental conditions, the power flow through each H-bridge modules changes and subsequently the DCL voltage might change. This leads to unequal DC levels in the pole voltage of the CHBMLI, which results in different switching stress of the power modules. Therefore, the life span of the switches will get reduced. To maintain equal switching stress on each H-bridge module, duty cycle of the boost DC to DC converters is varied according to the proposed algorithm. It maintains equal voltage at the output of the boost converter under uniform/non-uniform environmental conditions. To operate the CHBMLI, the triangular carrier phase-shifted modulation has been used. The proposed algorithm as well as performance of the multi-SPV fed CHBMLI is simulated using PSCAD/EMTDC software for three-bridge seven-level CHBMLI. The experimental results are obtained using E4360 Modular Solar Array Simulator and Spartan 3AN FPGA controller for two-bridge five-level CHBMLI.

在本文中，提出了一种通用算法来平衡n个级联 H 桥多电平逆变器 (CHBMLI) 的每个功率电池两端的直流链路 (DCL) 电压，使用 dc-dc 转换器，从多太阳能光伏 (SPV) 馈电) 阵列，用于在不同环境条件下独立应用，即辐射和温度的变化。由于环境条件的变化，流经每个 H 桥模块的功率会发生变化，随后 DCL 电压可能会发生变化。这导致 CHBMLI 的极电压中的直流电平不相等，从而导致电源模块的不同开关应力。因此，开关的寿命会缩短。为了在每个 H 桥模块上保持相等的开关应力，升压直流到直流转换器的占空比会根据所提出的算法而变化。它在均匀/不均匀的环境条件下保持升压转换器输出端的电压相等。为了操作 CHBMLI，使用了三角载波相移调制。使用 PSCAD/EMTDC 软件对三桥七级 CHBMLI 所提出的算法以及多 SPV 馈电 CHBMLI 的性能进行了仿真。实验结果是使用 E4360 模块化太阳能阵列模拟器和 Spartan 3AN FPGA 控制器获得的，用于双桥五级 CHBMLI。