基于一致性理论的多源直流配网功率自适应控制策略

An adaptive power control strategy in multi-source DC distribution networks based on consensus theory

在含高比例分布式电源的直流配网中,为实现有效的功率均衡与调度,文中提出一种基于一致性理论的分布式自适应功率协调控制策略,系统中各单元光伏、储能等均为可参与调度与控制的节点。提出将功率偏差和均衡系数同时作为各个节点间状态变量,各个节点通过相邻节点间状态变量交互和迭代,多组分布式电源可根据调度指令等自适应调整运行状态。在有效接受实时调度指令和储能最优控制的前提下,充分利用分布式电源自身的调节能力平抑系统内源荷功率不平衡,并且通过修正分布式电源的功率参考指令,保证各组分布式电源在不同运行场景下承担的功率和其额定容量成正比。当个别分布式电源因出力有限而失去调节能力时,仍可确保其他单元利用率的均衡。多种场景下的仿真结果验证了所提策略的有效性。

To realize power dispatch and equilibrium in DC distribution networks,a distributed adaptive coordinated control strategy is proposed.Based on the consistency theory,photovoltaics,energy storage and other units in the network can be considered as the same nodes involved in control,where power deviation and equalization coefficient are chosen as state variables in each node.By the interaction and iteration among adjacent nodes,each node can adaptively adjust the operation state according to the dispatching command.On the premise of effectively accepting the real-time dispatching command and optimal control of energy storage,the regulation ability of distributed power supply is fully utilized to suppress the power imbalance of internal load in the system.Meanwhile,the power provided by each distributed source is proportional to its rated capacity under different operating scenarios by adjusting the power reference,and the the prediction the output of each distributed sources is not required.When each individual distributed power supply loses its adjustment ability,the balance of utilization rate of other units can still be ensured.Simulation results under various scenarios verify the effectiveness of the proposed strategy.