access icon free Control strategy of wind energy conversion system based on H-MMC under asymmetrical grid faults

© The Institution of Engineering and Technology
Received 23/01/2019, Accepted 09/07/2019, Revised 02/06/2019, Published 26/07/2019

This study proposes a topology of wind energy conversion system based on hexagonal modular multilevel converter (H-MMC), which can connect the wind turbine and the AC grid with one stage conversion. It has the advantages of low power losses, low ripple of capacitor voltage and transformer-less grid connection. The operation principle of the proposed topology is analysed in detail. Then, the positive and negative sequence control method is proposed to eliminate the second harmonics in the output power of H-MMC under asymmetrical grid faults. The double proportional resonant (PR) controller is proposed to track arm current references without steady error. The effectiveness of the proposed topology and its control method are verified by simulations and hardware in loop tests.

Inspec keywords: power generation faults; power grids; HVDC power convertors; voltage-source convertors; wind power plants; power generation control; power conversion harmonics; wind turbines; power capacitors

Other keywords: double proportional resonant controller; low ripple; hexagonal modular multilevel converter; wind turbine; positive sequence control method; low power losses; control strategy; capacitor voltage; asymmetrical grid faults; transformer-less grid connection; H-MMC; wind energy conversion system; AC grid; negative sequence control method; one stage conversion

Subjects: Power supply quality and harmonics; AC-DC power convertors (rectifiers); Wind power plants; Control of electric power systems; Other power apparatus and electric machines; DC-AC power convertors (invertors)

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