ABSTRACT

Multilevel inverters are currently the subject of extensive investigation and are used primarily for medium and high voltage distribution systems. The work presented in this paper provides a cost-effective and realistic solution to mitigate power quality (PQ) problems. A Cascaded H-Bridge multilevel inverter (CHB-MLI) has been configured as a shunt active power filter (SAPF). It is well reported that large-scale use of power electronics-based devices leads to several PQ problems such as poor power factor, unregulated dc voltage, harmonics, voltage regulation etc. In this paper, an improved immune feedback control algorithm is proposed and developed to mitigate PQ issues by predicting the weighted active component of load current and to generate reference current for the grid. Extensive MATLAB simulation and experimental work have been reported for validation on a single-phase system. A low prototype model is developed in the laboratory to study and compare the steady-state and dynamic results of the proposed controller with conventional Least Mean Square (LMS) and Immune algorithm.

摘要

多电平逆变器目前是广泛研究的主题，主要用于中高压配电系统。本文中提出的工作提供了一种经济高效且现实的解决方案来缓解电能质量 (PQ) 问题。级联 H 桥多电平逆变器 (CHB-MLI) 已配置为并联有源电力滤波器 (SAPF)。据报道，大规模使用基于电力电子的设备会导致一些 PQ 问题，例如功率因数差、直流电压未调节、谐波、电压调节等。 本文提出并开发了一种改进的免疫反馈控制算法通过预测负载电流的加权有功分量来缓解 PQ 问题，并为电网生成参考电流。广泛的 MATLAB 仿真和实验工作已报告用于单相系统的验证。在实验室中开发了一个低原型模型来研究和比较所提出的控制器与传统最小均方 (LMS) 和免疫算法的稳态和动态结果。