直流微电网能量控制策略的研究

提出了一种直流微电网的能量管理控制策略,结合直流微电网的结构和控制目标,分别设计了系统在离网和并网模式下的控制策略。并网模式下,由电网来维持直流母线电压的稳定,光伏电池和锂电池配合给负载供电。当电网异常断电时,系统能自动脱离电网孤岛运行。通过合理控制锂电池的工作方式来实现工作模式的平滑切换。搭建实验平台,通过增减直流母线负载和开断并网开关来检测系统的稳定、可靠性。实验结果表明该控制策略实现了工作模式的平滑切换,满足了系统的设计要求。

A Novel Energy Control Strategy for DC Micro-grid Photovoltaic Power Generation

In this paper, a novel energy management control strategy is proposed for DC micro-grid, which combines the structure of the micro-grid and its integrated control objectives, it designs the system control strategy under grid pattern and island model. In the grid pattern, it uses the grid to maintain the stability of the dc bus voltage, PVs works in the MPPT mode all the way, it uses the difference between the PV power and the load power to control the battery. When the grid is abnormal, the system can switch to island mode automatically. In this paper, through the reasonable control of the workings of a lithium battery to realize smooth transition of work patterns. The paper used MATLAB simulation and experimental platform, through increasing or decreasing the load at DC bus terminals and changing the state of the synchronizing switch to detect the stability and reliability of the system. The simulation results show that this control strategy not only maintains the stability of the DC bus voltage, but also realize the smooth transition between the two kinds of mode, which meets the requirements of the system.