Abstract:
Voltage source converters (VSCs) are widely used for AC-DC power conversion and their control performance is important for the stability and dynamic behavior of the syste...Show MoreMetadata
Abstract:
Voltage source converters (VSCs) are widely used for AC-DC power conversion and their control performance is important for the stability and dynamic behavior of the system. This paper investigates a multi-input-multi-output (MIMO) state feedback controller for AC-DC VSCs to regulate the DC-link voltage and AC side power factor in the presence of large disturbances. The MIMO state feedback controller is designed based on pole placement (SF-PP) and linear quadratic regulator (SF-LQR) methods. The goal of this paper is to design a simple and effective controller that alleviates the burden of tuning parameters. The time-domain performance of the proposed controller is compared to the conventional decoupled dq-vector PI based control with two nested-loops with three PI controllers tuned based on the first-order-time-delay (FOTD) approach. The small-signal DC impedance-based analysis is employed to demonstrate the dynamic behavior of different controllers in the frequency-domain. Simulation results demonstrate the superior performance of the SF-LQR in controlling DC-link voltage over PI controller and comparable performance of SF-PP to PI controller for regulating power factor.
Published in: 2022 International Conference on Electrical, Computer and Energy Technologies (ICECET)
Date of Conference: 20-22 July 2022
Date Added to IEEE Xplore: 09 September 2022
ISBN Information: