Small-Signal Model-Based Control Strategy for Balancing Individual DC Capacitor Voltages in Cascade Multilevel Inverter-Based STATCOM
Yu Liu
Huang, A.Q.
Wenchao Song
Bhattacharya, S.
Guojun Tan
Dept. of Electr. Eng., North Carolina State Univ., Raleigh, NC;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: June 2009
Volume: 56,
Issue: 6
On page(s): 2259-2269
ISSN: 0278-0046
INSPEC Accession Number: 10713209
Digital Object Identifier: 10.1109/TIE.2009.2017101
First Published: 2009-03-16
Current Version Published: 2009-06-02
Abstract
This paper presents a new feedback control strategy for balancing individual DC capacitor voltages in a three-phase cascade multilevel inverter-based static synchronous compensator. The design of the control strategy is based on the detailed small-signal model. The key part of the proposed controller is a compensator to cancel the variation parts in the model. The controller can balance individual DC capacitor voltages when H-bridges run with different switching patterns and have parameter variations. It has two advantages: 1) the controller can work well in all operation modes (the capacitive mode, the inductive mode, and the standby mode) and 2) the impact of the individual DC voltage controller on the voltage quality is small. Simulation results and experimental results verify the performance of the controller.
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