Fuzzy logic controller based DC-Link Voltage Self-Balance Method for Multilevel Converter with less Number of Voltage Sensors
Journal Title: International Journal of Science Engineering and Advance Technology - Year 2015, Vol 3, Issue 11
Abstract
In many inverters, Voltage balance of dclink capacitors is very important for applications of a cascade multilevel converter or a modular multilevel converter. In this paper, a novel diode-clamped modular multilevel converter (DCM2 C) topology is proposed and a power feedback control method is developed with fuzzy logic controller. With the developed control strategy, the proposed diode-clamped circuit becomes controllable closed loop which enables the capacitor voltages to be clamped by low power rating clamping diodes. The proposed topology and control strategy has quicker response with transient state error reduction and requires much fewer voltage sensors than the normally used traditional method of multilevel inverters as diode clamped inverters; therefore, the system performance improvement and cost reduction are expected. Based on the proposed DCM2 C, a novel N +1-level cascade multilevel topology is proposed for a cascade active power filter (CS-APF). The Proposed fuzzy logic controller is implemented to get study state response at dc voltage capacitors, therefore to get balanced load outputs. The simulation results from the CS-APF have demonstrated and verified the effectiveness of the proposed novel topology and control method.
Authors and Affiliations
M. Siva Reddy| M.Tech, Scholar, Dept of EEE, Prakasam Engineering College, Kandukur, V. Haribabu| Associate Professor, Dept of EEE, Prakasam Engineering College, Kandukur, M. Bala Subba Reddy| Associate Professor Dept of EEE, Prakasam Engineering College, Kandukur
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