基于储能控制的交直流混合微电网运行策略研究

Hybrid AC /DC Micro-grid Operation Strategy Based on Energy Storage Control

储能系统在微电网安全稳定运行过程中发挥着不可替代的作用。微电网并网运行时,储能系统储存能量;孤岛运行时,作为微电网的主电源,维持系统电压和频率稳定。提出了一种适用于交直流混合微电网的锂电池储能系统能量管理策略,分析了锂电池组双向DC/DC和双向DC/AC变换器主电路及控制部分,建立了含最大功率点跟踪(MPPT)控制的光伏发电单元的微电网仿真模型,并搭建系统实验平台。仿真和实验结果表明,提出的微电网能量管理策略可以保证微电网在各种运行模式下均能安全稳定运行。

Energy storage system plays an irreplaceable role in the process of microgrid safe and steady operation. During grid-connected operation of microgrid, the main responsibility of the storage system is to store energy; during islanding operation, the goal is to maintain system voltage and frequency stability as the main power. This paper puts forward a lithium battery energy management strategy which is adaptable to hybrid AC/DC microgrid, and designs the hi-directional DC/DC converter and DC/AC converter and their controllers. The hybrid AC/DC microgrid has been modeled and simulated using the Simulink in the MATLAB contained photovoltaic power generation unit with the max- imum power point tracking （MPPT） control. Finally based on the design schemes, an AC/DC hybrid micro-grid test platform is developed. The simulation and experimental results demonstrate that the proposed AC/DC hybrid micro- grid operation strategy is able to realize its stable and reliable operation in all modes.