Coordinated LVRT Support for a PMSG-Based Wind Energy Conversion System Integrated into a Weak AC-Grid

Akrama Khan, Hasnain Ahmad, Syed Muhammad Ahsan, Muhammad Majid Gulzar and Sadia Murawwat
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Akrama Khan: Department of Electrical Engineering, Information Technology University, Lahore 54600, Pakistan
Hasnain Ahmad: Department of Computer Science, Qarshi University, Lahore 54600, Pakistan
Syed Muhammad Ahsan: Department of Computer Science, Qarshi University, Lahore 54600, Pakistan
Muhammad Majid Gulzar: Department of Electrical Engineering, University of Central Punjab, Lahore 54600, Pakistan
Sadia Murawwat: Department of Electrical Engineering, Lahore College for Women University, Lahore 54600, Pakistan

Energies, 2021, vol. 14, issue 20, 1-14

Abstract: In a grid, the choice of the point of common coupling (PCC) does not solely rely on the voltage level alone but also conjointly depends on the grid strength for many explicit purposes. Nowadays, the affinity of low SCR grid connections has become a crucial thought once it involves the integration of wind generation plants (WPPs). Since the quality of wind resources is a critical issue, these plants are usually placed in remote areas with a sophisticated potential of wind flow. These remote areas are typically less inhabited, where the grid does not perpetually always have to be sturdy. Moreover, the exceeded power demand loading and higher wind penetration affect the generation, transmission, and distribution utilities by permitting the flow of unbalanced voltages and currents in the power system. Therefore, the quality of transmitted power is becoming a crucial facet of distributed energy generation units. In this paper, a permanent-magnet synchronous generator (PMSG) based wind energy conversion system (WECS) is presented. It discusses a solution, which provides the low voltage ride through (LVRT) provision by the suppression of DC link overvoltage and active power limitation during an asymmetrical grid fault. With improved back-to-back converter control, the machine side converter (MSC) is employed to control the DC-link voltage. Furthermore, the grid side converter (GSC) is used to implement the active/reactive current injection according to the outlined limits. The need for external hardware is eventually avoided, which is typically required to dissipate the additional energy generated during a grid fault. Hence, it is proven to be an affordable solution.

Keywords: active/reactive current injection; LVRT support; positive and negative sequence current control; symmetrical and asymmetrical faults; suppression of DC-link voltages; weak AC grid (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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