A Smooth LVRT Control Strategy for Single-Phase Two-Stage Grid-Connected PV Inverters

Furong Xiao; Lei Dong; Shahnawaz Farhan Khahro; Xiaojiang Huang; Xiaozhong Liao

A Smooth LVRT Control Strategy for Single-Phase Two-Stage Grid-Connected PV Inverters

Furong Xiao

Lei Dong

Shahnawaz Farhan Khahro

Xiaojiang Huang

Xiaozhong Liao

Vol. 15, No. 3, pp. 806-818, May 2015

10.6113/JPE.2015.15.3.806

Low grid voltage mode

Low voltage ride-through

Normal grid voltage mode

Single-phase Grid-connected PV inverter

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Abstract

Based on the inherent relationship between dc-bus voltage and grid feeding active power, two dc-bus voltage regulators with different references are adopted for a grid-connected PV inverter operating in both normal grid voltage mode and low grid voltage mode. In the proposed scheme, an additional dc-bus voltage regulator paralleled with maximum power point tracking controller is used to guarantee the reliability of the low voltage ride-through (LVRT) of the inverter. Unlike conventional LVRT strategies, the proposed strategy does not require detecting grid voltage sag fault in terms of realizing LVRT. Moreover, the developed method does not have switching operations. The proposed technique can also enhance the stability of a power system in case of varying environmental conditions during a low grid voltage period. The operation principle of the presented LVRT control strategy is presented in detail, together with the design guidelines for the key parameters. Finally, a 3 kW prototype is built to validate the feasibility of the proposed LVRT strategy.

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Cite this article

[IEEE Style]

F. Xiao, L. Dong, S. F. Khahro, X. Huang, X. Liao, "A Smooth LVRT Control Strategy for Single-Phase Two-Stage Grid-Connected PV Inverters," Journal of Power Electronics, vol. 15, no. 3, pp. 806-818, 2015. DOI: 10.6113/JPE.2015.15.3.806.

[ACM Style]

Furong Xiao, Lei Dong, Shahnawaz Farhan Khahro, Xiaojiang Huang, and Xiaozhong Liao. 2015. A Smooth LVRT Control Strategy for Single-Phase Two-Stage Grid-Connected PV Inverters. Journal of Power Electronics, 15, 3, (2015), 806-818. DOI: 10.6113/JPE.2015.15.3.806.