一种微网群架构及其自主协调控制策略

摘要

As an interconnected system of multiple AC sub-grid and DC sub-grid, microgrid cluster's complex structure increases its difficulty in power coordination control. To address this issue, this paper proposes a microgrid cluster structure and its autonomous coordination control strategy. The proposed structure is composed of AC sub-grid, DC sub-grid, power exchange unit (PEU) and energy pool (EP). PEU is mainly used to coordinate power exchange among sub-grids and EP, which can realize energy mutual-aid among each sub-grid and maintain the stability of the bus voltage in each sub-grid. Besides, EP is used to stabilize the DC bus voltage of EP, and to reasonably allocate the exchange power that PEU needs. Meanwhile, this paper also proposes the power coordinated control method based on adaptive power exchange coefficient for PEU and the hierarchical coordinated control method for EP, respectively. With the application of the proposed control strategy, the autonomous coordinated control for the microgrid cluster can be realized. Simulation and experimental results have verified the proposed microgrid cluster structure and its autonomous coordination control strategy.%微网群作为多个交、直流子网的互联系统,其组成结构的复杂性增加了微网群的功率协调控制难度.提出一种微网群架构及其自主协调控制策略,该架构主要包括交、直流子网,功率交换单元(PEU)和能量池(EP).PEU主要用于协调微网群内各子网与EP进行功率交换,使得各子网实现能量互济,并维持各子网母线电压及频率的稳定;EP主要用于维持EP直流侧母线电压的稳定运行,并实现对PEU所需交换净功率的合理分配.针对PEU和EP分别提出基于自适应功率交换系数的功率协调控制方法和分层协调控制方法,有效地实现了微网群的自主协调控制.仿真与实验结果都证明了所提微网群架构及其自主协调控制策略的有效性.