Abstract
Regarding PMSG-based wind turbine generation system, this paper proposes a supercapacitor energy storage unit (SCESU) which is connected in parallel with the DC-link of the back-to-back converter to enhance its high voltage ride through performance. The analysis of the operation and control for the grid-side converter and SCESU are conducted. Based on real time digital simulators (RTDS), a model and a Hardware-in-the-Loop (HiL) platform of PMSG-based wind turbine with SCESU is developed, and the simulation results show that the SCESU absorbs the imbalanced energy and the grid-side converter absorbs inductive reactive power during the period of voltage swell and verify the correctness and feasibility of the high voltage ride through control strategy.
Highlights
In the past, wind turbine generation system (WTGS) was allowed to disconnect from the grid during grid voltage sag or swell
The results demonstrate the feasibility and effectiveness of the installed supercapacitor energy storage unit (SCESU) in enhancing high voltage ride through (HVRT) performance of the PMSG-based WTGS
This paper comes up with a potential HVRT solution for the PMSG-based WTGS based on the theoretical analysis of grid-side converter (GRSC) operation
Summary
Wind turbine generation system (WTGS) was allowed to disconnect from the grid during grid voltage sag or swell. With the high penetration of wind power in power systems in many countries, grid codes become stricter and require the fault ride-through capacity of WTGS, including high voltage ride through (HVRT) and low voltage ride-through (LVRT) profiles during which WTGS must remain connected and supply the expected reactive power to support the utility grid [1]. The latter has already received significant attention and explored in many literatures [2,3,4,5,6,7], and the former is an emerging issue and being paid more and more attention now. Additional inductive reactive current of 6% of the normal current for each 1% increase at point of common coupling (PCC) voltage above 1.1pu is required [8]
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