分布式预测控制在微电网协调控制中的应用

Application of distributed predictive control in coordinated control of microgrid

针对微电网的功率平衡与经济调度问题,提出了一种分布式协调预测控制方法。基于风力发电优先、光伏发电配合及必要时蓄电池补充的原则,选择合理的目标函数,通过最小化目标函数,对风力发电子系统和光伏发电子系统分别设计模型预测控制器,将分布式预测控制器的输出作为各子系统的输入,合理分配各子系统的输出功率,使其在全工况下可以很好地响应负荷变化。仿真结果表明,在复杂的气象条件和变负荷扰动下,所提出的分布式预测控制方法可以合理地分配各子系统的输出功率,既可满足负载的需求,还可限制子系统输出功率的过大波动,保护发电设备。

This paper proposes a distributed coordinated predictive control scheme for the power balance and economic dispatch problems of microgrid systems.We design the distributed coordinated predictive controllers for the wind power generation subsystem and solar power generation subsystem by minimizing a suitable objective function,respectively.The objective function is chosen based on the principle that the wind power subsystem is operated as the primary generation system,the solar power subsystem is considered as the auxiliary generation system,and the battery bank is only activated when the wind and solar power subsystem can’t satisfy the power demand.The output of the distributed predictive controller is regarded as the reference input of each subsystem,so that it can respond to the load change in full operation condition,and distribute the output power of each subsystem reasonably.The simulation results show that the proposed distributed coordinated predictive control scheme can allocate the output power of subsystems reasonably under varying environment conditions,which not only can satisfy the load demand but also attenuate excessive fluctuations of output power to protect the power generation equipment.