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Energies 2018, 11(1), 57; doi:10.3390/en11010057

H Robust Control of an LCL-Type Grid-Connected Inverter with Large-Scale Grid Impedance Perturbation

1
School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221000, China
2
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221000, China
*
Author to whom correspondence should be addressed.
Received: 15 November 2017 / Revised: 10 December 2017 / Accepted: 22 December 2017 / Published: 1 January 2018
(This article belongs to the Section Energy Fundamentals and Conversion)

Abstract

In the distributed power generation system (DPGS), there may be a large range perturbation values of equivalent grid impedance at the point of common coupling (PCC). Perturbation of the impedance will cause resonant frequency variation of the Inductance Capacitance Inductance (LCL) filter on a large scale, affecting the quality of the grid current of the grid-connected inverter (GCI) and even causing resonance. To deal with this problem, a novel H robust control strategy based on mixed-sensitivity optimization is proposed in this paper. Its generalized controlled object is augmented by properly selecting weighting functions in order to consider both tracking performance around power frequency and the stability margin in a high frequency of the GCI. For convenient implementation, the H robust controller is simplified by model reduction from the seventh order to the third order. By comparison with a traditional control strategy with a quasi-proportional resonance controller, the proposed H robust control strategy avoids crossing 180 degrees at the resonant frequency point in the phase frequency characteristic of current loop, and moves the phase frequency characteristic left. It guarantees a sufficient margin of stability throughout the designed range of grid impedance perturbation values and avoids the difficulty of parameter setting. Finally, the experimental results support the theoretical analyses and demonstrate the feasibility of the proposed strategy. View Full-Text
Keywords: Inductance Capacitance Inductance (LCL) filter; grid impedance perturbation; quasi-proportional resonance controller; H robust control Inductance Capacitance Inductance (LCL) filter; grid impedance perturbation; quasi-proportional resonance controller; H robust control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, Y.; Wang, J.; Zeng, W.; Liu, H.; Chai, Y. H Robust Control of an LCL-Type Grid-Connected Inverter with Large-Scale Grid Impedance Perturbation. Energies 2018, 11, 57.

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