光伏发电系统输出功率易受外部环境的影响,存在诸多不确定因素.该文采用蓄电池储能单元作为光伏并网的能量缓冲装置,以控制并网的功率输出.文中建立了基于等效电路的电池储能光伏并网系统整体动态数学模型,设计相应的控制策略,对系统的输出功率进行控制,并以随机光照强度的扰动为例,对系统输出的电能质量和稳定性进行仿真研究.结果表明,该并网系统灵活性强,能很好实现系统功率可控稳定输出.%The output power of photovoltaic(PV) system is vulnerable to the impact of changes in the external environment and exists many uncertainties. The research on the possibility of employing a battery energy storage method in PV grid-connected power generation system to enhance the performance of its power quality and stability was done. A mathematic model of battery energy storage system (BESS) based on equivalent circuit and a photovoltaic based on global dynamic mathematical model for PV-BESS grid-connected were built, and corresponding conrtol srtategy was developed to control the output power. Based on these models,illumination change random for example, a simulaiton platform of PV-BESS was developed by Simulink of the Matlab to analyze the power quality and stability. Simulation results show that it is flexible and can improve the stability of output power.
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