向无源网络供电的VSC-HVDC模型预测控制

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Abstract The discrete mathematic models of the rectifier and inverter side of the VSC-HVDC system supplying passive networks are derived.As traditional double closed-loop control strategy based on PI regulator exists many shortcomings such as complicated control structure, the difficulties to tuning multiple PI parameters and achieve multi-objective control, direct power control of the rectifier side and direct ac voltage control of the inverter side based on model predictive control are proposed in this paper.The implementation process of the proposed control method is described in detail.The selection principle of weight coefficients is proposed and is explained with the help of simulation example, which overcomes subjectivity and blindness of selection of weight coefficients.Many circumstances are simulated by setting up VSC-HVDC system supplying passive networks in PSCAD/EMTDC, i.e.rectifier side reactive power reference step, dc voltage reference step, inverter side with no load, linear load, and nonlinear load, load sudden change, ac voltage rise, model parameter deviation, and faults in inverter side.Simulation results show that the proposed control method has excellent steady-state and dynamic performance, has good robustness for model parameter, and can provide high quality power for passive networks in all cases.

Key words： Model predictive control passive networks discrete mathematic model selection of weigh coefficients

Received: 28 November 2014 Published: 29 June 2015

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TM46

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