This article presents a cascaded packed U cell (CPUC) converter tied to solar photovoltaic (PV) system. Here, a set of 25 levels in output voltage provides excellent harmonic performance and give a new approach for the solar-grid tied system. The nearest level modulation strategy (NLMS) is considered for fundamental switching at 50 Hz. One solar PV source is used at the high side directly connected to the capacitor. Here rest three sources are self-supported with DC link capacitors. A simple PI controller approach is presented for the voltage balancing of the floating capacitors. The closed-loop control is used to perform the whole operation and to feed power from the PV array to the grid end. Simulated results are observed through MATLAB/Simulink and further results are validated in real-time. Recorded results show the viability for power quality improvement. The major objective of work is to analyze performance of CPUC converter efficiency and power quality for PV grid-tied applications.

中文翻译：

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采用 NLMS 并网应用的基于 CPUC 的太阳能光伏系统的电能质量评估


本文介绍了一种与太阳能光伏 (PV) 系统相连的级联封装 U 电池 (CPUC) 转换器。这里，一组 25 个级别的输出电压提供了出色的谐波性能，并为太阳能并网系统提供了一种新方法。最近电平调制策略 (NLMS) 被考虑用于 50 Hz 的基本切换。高压侧使用一个太阳能光伏电源，直接连接到电容器。这里剩下的三个电源是由直流母线电容器自支撑的。提出了一种简单的 PI 控制器方法来平衡浮动电容器的电压。整个操作采用闭环控制来执行，并将光伏阵列的电力馈送到电网端。通过 MATLAB/Simulink 观察模拟结果，并实时验证进一步的结果。记录的结果显示了改善电能质量的可行性。工作的主要目标是分析光伏并网应用的 CPUC 转换器效率和电能质量的性能。