含母线电压补偿和负荷功率动态分配的直流微电网协调控制

针对孤岛直流微电网需要独自承担系统母线电压稳定和精确的功率分配,提出了含母线电压补偿和负荷功率动态分配的协调控制策略。在主控制层中采用下垂控制来实现分布式电源之间的功率共享;在下垂控制的基础上,提出了考虑电压调节控制和电流矫正控制的分布式二次控制,其对传统下垂控制带来的直流母线电压跌落进行补偿,使得母线电压恢复到额定值;通过对下垂系数的不断调整,达到了负荷功率分配的高精度。最后,利用MATLAB/Simulink对所设计的控制策略在不同运行模式下进行仿真验证,仿真结果表明所提的控制策略可以实现直流微电网的稳定运行和负荷功率的动态分配,且能够满足分布式电源即插即用等要求。

Coordinated control of DC microgrid considering bus voltage compensation and load power dynamic sharing

As for the islanding DC microgrid is required to independently bear bus voltage stability and accurate power sharing, a coordinated control strategy considering bus voltage compensation and load power dynamic sharing is proposed. Firstly, the droop control is used in the primary control layer to realize power sharing among DGs(Distributed Generations). Secondly, on the basis of droop control, the distributed secondary control considering voltage regulation control and current correction control is proposed, which compensates the DC bus voltage drop caused by the traditional droop control, so that the bus voltage recovers to the rated value. And through the constant adjustment of the droop coefficient, the high precision of the load power sharing is achieved. Finally, the designed control strategy is verified by simulation on MATLAB/Simulink under different operating modes, simulative results show that the proposed control strategy can achieve the stable operation of DC microgrid and the dynamic distribution of load power, and satisfy the requirements of supply plug and play for DGs.