A general closed-loop power-decoupling control for reduced-switch converter-fed IM drives
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ORIGINAL PAPER
A general closed‑loop power‑decoupling control for reduced‑switch converter‑fed IM drives Shuqi Shi1,2,3 · Yao Sun1,3 · Hanbing Dan1,3 · Dongran Song1,3 · Mei Su1,3 · Bin Guo1,3 · Hongwei Tang2 Received: 25 January 2020 / Accepted: 21 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Twice ripple power exists in single-phase to three-phase reduced-switch induction motor drives, which degrades the performance of the drive system, such as larger total harmonic distortion of the grid current, the larger ripple voltage in the dc link and the larger torque ripple. Most existing power decoupling schemes are open-loop decoupling methods. However, the open-loop decoupling method has the disadvantages of heavy computation and strong dependency of parameters. This paper analyzes all steady state solutions of the decoupling capacitor voltage from the point of view of solving differential equations and presents a unified multi-proportional-resonant closed-loop decoupling method to suppress the ripple voltage on the dc bus. The whole drive system adopts a hybrid predictive control strategy with dual loops to coordinate the operation of each part. Comprehensive experimental results are presented to verify the effectiveness of the presented method. Keywords Reduced-switch-converter · Ripple power decoupling · Predictive control · Multi-proportional-resonant control
1 Introduction In residential applications, variable-frequency induction motor (IM) drives are usually fed by voltage-source inverter supplied by grid-tied rectifier to improve the power efficiency [1, 2]. From the perspective of accessibility, costs and reliability, single-phase to three-phase converters with fewer switches are preferred. To achieve lower cost, higher reliability and smaller volume, some single-phase input three-phase output converters with reduced-switch-count are proposed [3–5]. In these converters, some are multiplexed by power tube bridge arm, and the others are multiplexed by capacitor bridge arm. For instance, Fig. 1 shows a converter consisting of a
* Hanbing Dan [email protected] 1
School of Automation, Central South University, Changsha, China
2
Hunan Provincial Key Laboratory of Grids Operation and Control on Multi‑Power Sources Area, Shaoyang University, Shaoyang, China
3
Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid, Central South University, Changsha, China
single-phase half-bridge rectifier and four-switch three-phase inverter [6], where the capacitor bridge arm is multiplexed. In single-phase converters, the ripple power at double line frequency is inherent and inevitable. And the ripple power will spread to the devices on the dc bus and further influence their performance, if it is not properly handled. To mitigate the ripple voltage with the low frequency harmonic on the dc bus, active power decoupling method for diverting the second-order ripple power away from the dc bus is usually adopted [6–9]. These methods usually need to add a decoupling
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