一种适用交直流混合微电网的组网方法及控制策略研究

Research on a Networking Method and Control Strategy Suitable for AC/DC Hybrid Microgrid

交直流混合微电网网架结构是能量管理、控制、保护和稳定的基础。根据交直流混合微电网的特点,提出了一种基于能量守恒原则及分区、分层匹配原则的组网设计流程,并给出了改进交直流混合微电网主从协调控制策略,采用一种新型主控制器,当储能逆变器由PQ控制切换至V/f控制时,能够克服暂态时刻将产生较大的电压、频率和功率波动,保证微电网安全稳定运行。基于某实际风光储柴微电网项目,设计拓扑结构并搭建PSCAD仿真模型,验证了所提组网设计和主从控制策略的有效性,为未来大规模交直流混合微电网的规划设计及运行提供参考。

The structure of the AC/DC hybrid microgrid is the basis of energy management,control,protection and stability.According to the characteristics of the AC/DC hybrid microgrid,a networking design process based on the principle of energy conservation and the principle of zoning and hierarchical matching is proposed.On this basis,the improved master-slave coordination control strategy of AC/DC hybrid microgrid is proposed,and a new type of master controller is adopted.When the energy storage inverter is switched from PQ control to V/f control,it can overcome the transient moment and produce large voltage,frequency and power fluctuations,so as to ensure the safe and stable operation of the microgrid.Based on an actual PV-wind-storage-diesel microgrid project,the topology structure was designed and the PSCAD simulation model was set up,which verified the effectiveness of the proposed networking design and master-slave control strategy,and provided a reference for the planning,design and operation of large-scale AC/DC hybrid microgrid in the future.