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Control of three-level VSIs with a LQR-based gain-scheduling technique applied to DC-link neutral voltage and power regulation

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5 Author(s)

A simple and effective method to design a regulator for the complete large-signal control of the three-level neutral-point-clamped (NPC) VSI is presented. For the regulator calculation, a comprehensive multivariable model of the NPC-VSI converter is used. The control strategy is based on linear quadratic regulator (LQR) and gain-scheduling control techniques. Any state variable can be regulated using the proposed method, either in small and large-signal operation, including state variables related to DC-link voltages. With the model and regulator presented, DC-link unbalance regulation is also achieved by means of the controller action instead of the switching strategy. A controller is designed to keep DC-link neutral point voltage balanced and to regulate the power delivered to the load. Simulation results confirm the validity of the proposed controller design. Steady-state and transient operation experimental results are obtained using a NPC-VSI prototype and a PC-embedded DSP board for control implementation.

Published in:

IECON 02 [Industrial Electronics Society, IEEE 2002 28th Annual Conference of the]  (Volume:2 )

Date of Conference:

5-8 Nov. 2002