Abstract
This research introduces a filtering circuit design integrated with the DC-link of a medium power variable speed drive (VSD) system. The designed filtering circuit employs modern power electronic circuits to improve time response characteristics in both grid and dc-link sides. Depending on the widely used multi-level converters, a conventional three-level H-bridge four-quadrant chopper scheme was developed into a cascade five-level H-bridge four-quadrant chopper scheme. The time response of the proposed system was performed with both choppers, and results showed that voltage drop on cascade chopper transistors was reduced to half in comparison with voltage drop on conventional four-quadrant chopper transistors. Moreover, the sharp fluctuations in system's waves were mitigated; consequently, time response characteristics in both steady and transient states were remarkably improved. The total harmonic distortion factor THD% of the input current and voltage was reduced to 26.2% and 2.43% respectively and the ripple factor RF for DC-link current was reduced to 0.196.
Highlights
The electrical drive is one of the mainstays of the international economy; it provides comfort and prosperity in modern daily life and improve living standards
When AC motors are used in variable speed drive (VSD) systems, voltage is firstly rectified to produce DC voltage, the rectified DC voltage is converted into AC voltage with the required modulations, which is achieved using power electronics such as the different topologies of converters
The studied system is a medium power variable speed drive system composed of an electrical network, six pulses full bridge diode rectifier, and DC-link with five level cascade four-quadrant chopper integrated with this system to enhance the power quality of the system
Summary
The electrical drive is one of the mainstays of the international economy; it provides comfort and prosperity in modern daily life and improve living standards. One type is Boost chopper proposed to adjust the fundamental portion of the current and eliminate harmonics The importance of this method stems from the fact that it maintains a constant fundamental component value during different operation conditions, which is appropriate for motor drive applications [9]. Another type is the buck-boost chopper that has been used in DC-link and has many advantages. A configuration of Modular Multilevel Converter (MMC) using Dual Active Bridge (DAB) for medium voltage drive applications is proposed to overcome some issues that are familiar in MMC at low frequency operation mode These problems are the circular current and the capacitor ripples. The conclusions and recommendations drawn from this work, in addition to references are shown in sections 6, 7 respectively
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