Design and optimization of LCL-VSC grid-tied converter having short circuit fault current limiting ability

Mengqi Liu; Haijun Liu; Zhikai Wang

doi:10.1117/12.2265259

23 January 2017 Design and optimization of LCL-VSC grid-tied converter having short circuit fault current limiting ability

Mengqi Liu, Haijun Liu, Zhikai Wang

Author Affiliations +

Proceedings Volume 10322, Seventh International Conference on Electronics and Information Engineering; 1032233 (2017) https://doi.org/10.1117/12.2265259
Event: Seventh International Conference on Electronics and Information Engineering, 2016, Nanjing, China

Abstract

Traditional LCL grid-tied converters haven’t the ability to limit the short-circuit fault current and only remove grid-connected converter using the breaker. However, the VSC converters become uncontrollable after the short circuit fault cutting off and the power switches may be damaged if the circuit breaker removes slowly. Compared to the filter function of the LCL passive components in traditional VSC converters, the novel LCL-VSC converter has the ability of limiting the short circuit fault current using the reasonable designed LCL parameters. In this paper the mathematical model of the LCL converter is established and the characteristics of the short circuit fault current generated by the ac side and dc side are analyzed. Thus one design and optimization scheme of the reasonable LCL passive parameter is proposed for the LCL-VSC converter having short circuit fault current limiting ability. In addition to ensuring the LCL passive components filtering the high-frequency harmonic, this scheme also considers the impedance characteristics to limit the fault current of AC and DC short circuit fault respectively flowing through the power switch no more than the maximum allowable operating current, in order to make the LCL converter working continuously. Finally, the 200kW simulation system is set up to prove the validity and feasibility of the theoretical analysis using the proposed design and optimization scheme.

Citation Download Citation

Mengqi Liu, Haijun Liu, and Zhikai Wang "Design and optimization of LCL-VSC grid-tied converter having short circuit fault current limiting ability", Proc. SPIE 10322, Seventh International Conference on Electronics and Information Engineering, 1032233 (23 January 2017); https://doi.org/10.1117/12.2265259

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KEYWORDS

Liquid crystal lasers

Switches

Inductance

Digital filtering

Capacitors

Control systems design

Control systems

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