Professional paper
Interaction of DC-link Supply Unit and Supplied Inverters with Regenerative Load
Fetah Kolonić
Đino Kunjašić
Željko Jakopović
Abstract
A technical solution for the group of AC adjustable speed drives supplied from a common DC link has been described. Besides high control demands, the described drives have very fast speed and torque changes, resulting with significant required braking power due to high load inertia. The demands for progressive converter capacitor charging and braking energy recuperation are suggesting application of four-quadrant SCR (Silicon Controlled Rectifier) line converter for supplying common DC link. Basic system properties, problems, solutions and experience acquired during system commissioning have been analyzed, particularly the interaction of DC link supply converter and connected inverters during regenerative braking. The influence of the additional DC link voltage compensation on the system properties in recuperation mode, together with a comparison between the proposed pseudo-derivative feedback (PDF) voltage controller and the cascade PID controller, has been made. The experimental verification of the dynamic system performance during recuperation has been performed in wire rod rolling mill ø5, with high technological production line speed of 100 m/s.
Keywords
SCR line converter; common DC link; inverters; AC drives; regenerative braking
Hrčak ID:
6802
URI
Publication date:
18.11.2004.
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