access icon free Passivity-based linear feedback control of permanent magnetic synchronous generator-based wind energy conversion system: design and analysis

This study designs a passivity-based linear feedback control scheme of a permanent magnetic synchronous generator-based wind energy conversion system, which attempts to achieve a maximum power point tracking (MPPT) at generator-side voltage source converter (VSC) and enhance fault ride-through (FRT) capability at grid-side VSC simultaneously. A storage function is constructed based on the passivity theory, in which the actual role of each term is meticulously investigated while the beneficial ones are remained so as to significantly improve the transient responses. Then, an auxiliary input is employed in the form of linear feedback control to ensure a desired tracking error convergence. Moreover, the closed-loop system stability is thoroughly analysed, together with a detailed physical interpretation of the storage function. Three case studies are undertaken including step change of wind speed, stochastic wind speed variation, and FRT. Simulation results verify that the proposed approach can effectively achieve MPPT and dramatically improve the FRT capability under various operation conditions against that of vector control and feedback linearisation control.

Inspec keywords: closed loop systems; synchronous generators; linear systems; feedback; maximum power point trackers; machine vector control; transient response; power system stability; wind power plants; permanent magnet generators; power generation faults; power generation control; voltage-source convertors

Other keywords: grid-side VSC; fault ride-through capability; vector control; MPPT; stochastic wind speed variation; permanent magnetic synchronous generator-based wind energy conversion system; passivity-based linear feedback control scheme; FRT capability; tracking error convergence; transient responses; generator-side voltage source converter; storage function; closed-loop system stability; maximum power point tracking; auxiliary input

Subjects: Synchronous machines; Power system control; Linear control systems; Stability in control theory; Wind power plants; Control of electric power systems; DC-DC power convertors

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