基于一致性算法的直流微电网多组光储单元分布式控制方法

Consensus Based Distributed Control for Multiple PV-battery Storage Units in DC Microgrid

为解决分布式直流微电网中多组蓄电池储能单元(batterystorageunit,BSU)之间的协同控制问题,首先提出一种基于一致性算法的分布式控制,能够实现各BSU按电池的荷电状态(stateofcharge,So C)成比例分配功率,同时可以调节分布式网络中各母线电压的平均值使其维持在额定值。考虑到基于电压观测器的分布式电压控制会因为时延以及观测器初值等问题产生稳态误差,进一步提出一种基于PI一致性算法的电压优化控制策略,将电压控制问题转换为优化问题,优化目标为保证各母线偏离额定值的偏差和最小。仿真结果表明,所提控制策略的稳态值可以不受时延和算法积分器初值的影响,具有更高的可靠性和鲁棒性。

In order to solve the problem of coordinated control between multiple battery storage units(BSUs)in an isolated DC microgrid,this paper proposed a distributed control based on the consensus algorithm.The output power of each BSU was allocated proportionally according to the state of charge(SoC)of the battery,and the average value of each bus voltage could be restored to the rated value.However,considering that the observer-based voltage control will lead to steady-state error due to the delay and inappropriate initial values of the observer,a voltage optimal control strategy based on PI consensus algorithm was proposed further.The voltage control issue in the DC microgrid was treated as an optimization problem and the control objective was to minimize the sum of the bus voltage error of each BSU.Simulation results show that the proposed control strategy will not be affected by neither the time delay nor the initial value of the integrator at steady state,and thus is more reliable and robust than the traditional method.