ABSTRACT

Due to a phenomenal increase in non-linear/linear loads in the last two decades, power quality (PQ) has been a major concern nowadays. PQ issues and solutions for problems such as injection of harmonics by non-linear loads, voltage regulation, power factor correction etc. are current topics of research. So, harmonic mitigation using a Cascaded-H Bridge Multilevel Inverter (CHB-MLI) is the focus of this paper. In this paper, photovoltaic Static compensator (PV-STATCOM) is designed and simulated; its working is checked in two modes. In mode-I, both active and reactive power are supplied to the grid, which is performed during day time only. In mode-II, only reactive power is supplied to the grid, and this mode works during night time. Therefore, the proposed PV-STATCOM can be utilised to its full potential throughout the day. A new proposed adaptive control technique-Sigmoid Least mean square (SLMS) and PV feed-forward term are combined to generate reference currents. Phase shift pulse width modulation (PS-PWM) technique is implemented to generate the pulses. The complete system is simulated in both the modes under various load conditions. Hardware results for the developed five-level MLI prototype are also illustrated.

摘要

由于过去二十年非线性/线性负载的显着增加，电能质量 (PQ) 已成为当今的主要问题。非线性负载注入谐波、电压调节、功率因数校正等问题的 PQ 问题和解决方案是当前的研究课题。因此，使用级联 H 桥多电平逆变器 (CHB-MLI) 的谐波抑制是本文的重点。本文设计并仿真了光伏静态补偿器（PV-STATCOM）；它的工作在两种模式下检查。在模式 I 中，有功功率和无功功率都提供给电网，这仅在白天执行。在模式II中，仅向电网提供无功功率，并且该模式在夜间工作。因此，提议的 PV-STATCOM 可以全天发挥其全部潜力。一种新提出的自适应控制技术——Sigmoid 最小均方 (SLMS) 和 PV 前馈项相结合以生成参考电流。实施相移脉宽调制 (PS-PWM) 技术来生成脉冲。整个系统在两种模式下在各种负载条件下进行仿真。还说明了开发的五级 MLI 原型的硬件结果。