基于MPC的SMES多目标控制

Multi-objective Control of SMES Based on MPC

模型预测控制(model predictive control,MPC)性能优越,响应迅速而且可实现多目标控制,已受到广泛关注并逐步应用于大功率变流器,特别是在具有高功重比的超导储能磁体(superconductor magnetics energy storage,SMES)控制系统中,应用前景十分广阔。本文提出的基于MPC的SMES多目标控制,不仅实现SMES线圈在储能时较高精度的电流跟踪,同时可控制SMES线圈充放电时电流变化速率,避免较大的电流冲击,而且能够提高其响应速度与精度。通过搭建仿真实验平台验证了本文提出的SMES系统储能稳流性能、功率平衡稳定性能、动态性能以及充放电速率的控制性能。并与基于PI控制的系统进行比较,结果表明基于模型预测控制的SMES系统不仅可以实现稳态时较高精度的电流跟踪,而且可以实现充放电时电流变化速率的控制。

Model predictive control(MPC)has received wide attention and has been applied gradually to high power converters due to its excellent performance,fast response and achievement of multi-objective control.Its application prospect is very broad especially in the control system of super conducting magnetics energy storage(SMES)with high power to weight ratio.The MPC-based SMES multi-objective control,which is proposed in this paper,can not only achieve high precision current tracking of SMES coil in energy storage,at the same time control the current change rate of SMES coil during charge and discharge,avoid large current impact,but also improve its response speed and accuracy.The simulation experimental platform is set up to verify the steady current performance,power balance stability performance,dynamic performance as well as the control performance of the charge and discharge rate of the SMES system proposed in this paper.The result shows through comparison with PI-based system that the SMES system based on model predictive control can not only achieve high-precision current tracking in steady state,but also can achieve the control of current change rate during current charge and discharge.