Investigation of a VSC-HVDC adaptive control strategy based on the model prediction strategy

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    The VSC-HVDC system has a nice selfcommutated ability and can supply power to the passive network and weak AC network directly. In this paper, an adaptive control strategy is proposed for the inverter side of a VSC-HVDC system to overcome the problems of PI parameter tuning difficulties and the poor dynamic response of traditional double closedloop control. Firstly, the mathematical model of the VSC-HVDC system in the dq0 coordinate system is deduced with a discrete format. The prediction model of AC voltage control on the inverter side and the corresponding multiobjective optimization performance function are given. Then, the improved multistep strategy of model predictive control is designed by introducing the an incremental operator and the feedback correction link, which improves the parameter robustness of the prediction model. Finally, the VSC-HVDC power supplying system under different operating conditions is simulated to demonstrate the reliability and efficiency of the proposed control strategy.

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  • Online: August 20,2020
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