Due to the impact of natural factors, the output power of off-grid photovoltaic microgrid source is intermittent and random. This will lead to fluctuations of the bus voltage. To ensure the reliability and power quality of power supply, configuring a certain capacity of storage devices becomes necessary. This paper proposes and designs a PV program which the flywheel energy storage system is applied to as an auxiliary and control strategy that stabilizing the DC bus voltage in sections. Charge/discharge link of the drive motor for flywheel and its control method is analyzed and deduced based on theory of sliding mode control. A corresponding simulation module is constructed in Matlab/Simulink simulation environment. Controlling the bus voltage in two ways in the simulation, including the traditional PI control and sliding mode control, the results demonstrate the superiority of the sliding mode control method. The voltage quality of PV microgrid is effectively improved.%由于受到自然因素的影响，离网运行的光伏微网电源输出功率具有间歇性和随机性，这会导致其母线电压产生波动。因此需配置一定容量的储能设备，以确保供电的可靠性和电能质量。提出一种采用飞轮储能系统辅助储能的光伏发电方案，设计了分段稳定直流母线电压的控制策略。基于滑模变结构控制理论对飞轮驱动电机的充/放电环节进行了分析和控制方法推导。在 Matlab/Simulink 仿真环境下搭建了相应的仿真模型。分别对采用传统PI 方法和滑模控制方法两种方式下母线电压控制过程进行了仿真，结果表明滑模控制更具有优越性，光伏微网的电压质量得到了有效的提高。
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