Abstract
Motor drive systems based on diode-rectifier are utilised in many industrial and commercial applications due to their cost-effectiveness and simple topology. However, these diode rectifier-based systems can be affected by power quality and harmonics in distribution networks. Thus, this paper investigates the impact of grid voltage harmonics on the operation of power converters with three-phase diode rectifier using mathematical formulation of the drive voltage and current harmonics based on grid voltage harmonics. Simulation analysis and practical tests have been then carried out to validate the mathematical equations and the impact of grid voltage harmonics on the power converter harmonics. The results illustrate that even a small amount of grid voltage harmonics (around 4%) could significantly impact the input current harmonic contents of the three-phase diode rectifier. It is also shown that the phase-angle of grid voltage harmonics plays a crucial role to improve or deteriorate the input current harmonics of the power converters. In the next step, the optimum condition of grid voltage harmonics to minimise the input current harmonics has been evaluated and verified based on different grid codes. Finally, a harmonic mitigation technique in multi-drive systems using Electronic Inductor is proposed to mitigate the current harmonics at the PCC.
Highlights
In recent years, a higher installation level of nonlinear power electronics-based devices, such as Adjustable Speed Drives (ASDs), computers, and LED lighting, has become noticeable in residential, commercial, and industrial distribution networks [1]
The results show that a small amount of grid voltage harmonics could have a high impact on the generated current harmonics at the drive rectifier input
As for the results of IEC 61000-3-12 standard limits shown in Fig. 15 (b), the impact of the voltage harmonics phase-angle on the Total Harmonic Distortion (THDi) is still significant, where it can be reduced by 30% or increased by 20% compared to case 1
Summary
A higher installation level of nonlinear power electronics-based devices, such as Adjustable Speed Drives (ASDs), computers, and LED lighting, has become noticeable in residential, commercial, and industrial distribution networks [1]. Researchers have investigated the impact of the increased utilisation of nonlinear loads on the distribution networks It has been shown in [68] that the installation of low quality Compact Fluorescent Lamps (CFLs) could increase the voltage distortion at the medium voltage level and lead to more harmonics-related power loss [8]. The reviewed literature indicates that there is a research gap in analysis of the impact of grid voltage harmonics on the input current of ASDs with three-phase diode rectifier. The results show that a small amount of grid voltage harmonics could have a high impact on the generated current harmonics at the drive rectifier input.
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