Transient-Performance-Oriented Discrete-Time Design of Resonant Controller for Three-Phase Grid-Connected Converters

Zhanfeng Song; Yun Yu; Yaqi Wang; Xiaohui Ma

Transient-Performance-Oriented Discrete-Time Design of Resonant Controller for Three-Phase Grid-Connected Converters

Vol. 19, No. 4, pp. 1000-1010, Jul. 2019

10.6113/JPE.2019.19.4.1000

Discrete-time design

Grid-connected converters

Resonant controller

Transient performance

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Abstract

The use of internal-model-based linear controller, such as resonant controller, is a well-established technique for the current control of grid-connected systems. Attractive properties for resonant controllers include their two-sequence tracking ability, the simple control structure, and the reduced computational burden. However, in the case of continuous-designed resonant controller, the transient performance is inevitably degraded at a low switching frequency. Moreover, available design methods for resonant controller is not able to realize the direct design of transient performances, and the anticipated transient performance is mainly achieved through trial and error. To address these problems, the zero-order-hold (ZOH) characteristic and inherent time delay in digital control systems are considered comprehensively in the design, and a corresponding hold-equivalent discrete model of the grid-connected converter is then established. The relationship between the placement of closed-loop poles and the corresponding transient performance is comprehensively investigated to realize the direct mapping relationship between the control gain and the transient response time. For the benefit of automatic tuning and real-time adaption, analytical expressions for controller gains are derived in detail using the required transient response time and system parameters. Simulation and experimental results demonstrate the validity of the proposed method.

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Cite this article

[IEEE Style]

Z. Song, Y. Yu, Y. Wang, X. Ma, "Transient-Performance-Oriented Discrete-Time Design of Resonant Controller for Three-Phase Grid-Connected Converters," Journal of Power Electronics, vol. 19, no. 4, pp. 1000-1010, 2019. DOI: 10.6113/JPE.2019.19.4.1000.

[ACM Style]

Zhanfeng Song, Yun Yu, Yaqi Wang, and Xiaohui Ma. 2019. Transient-Performance-Oriented Discrete-Time Design of Resonant Controller for Three-Phase Grid-Connected Converters. Journal of Power Electronics, 19, 4, (2019), 1000-1010. DOI: 10.6113/JPE.2019.19.4.1000.