期刊
IET POWER ELECTRONICS
卷 11, 期 1, 页码 120-128出版社
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-pel.2017.0049
关键词
predictive control; machine control; electric current control; asynchronous generators; stators; power grids; rotors; machine vector control; dynamic response; model predictive stator current control; doubly fed induction generator; network unbalance; MPSCC strategy; unbalanced grid voltage conditions; balanced stator currents; power grid; rotor currents; vector control; current loop bandwidth; dynamic responses; resonant regulators; second-order generalised integrators; second-order vector integrators; negative sequence components; virtual stator currents; DFIG system; power 1 kW
This study proposes a model predictive stator current control (MPSCC) strategy of doubly fed induction generator (DFIG) under unbalanced grid voltage conditions. Sinusoidal and balanced stator currents injected into the power grid can be ensured due to the direct control of stator currents rather than rotor currents. Model predictive control instead of traditional vector control is adopted, which can increase the current loop bandwidth and obtain faster dynamic responses. Conventional resonant regulators such as second-order generalised integrators or second-order vector integrators that are usually used to eliminate unbalanced components in stator currents can also be avoided. Moreover, both extractions of negative sequence components in rotor or stator currents and calculation of commanded rotor current are avoided, which simplifies the control scheme. The proposed MPSCC strategy can also implement the grid connection by introducing the virtual stator currents without any changes in the control scheme. Finally, experimental results based on a 1kW lab DFIG system are provided to validate the effectiveness of the proposed control strategy.
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