储能型准Z源光伏并网系统能量管理研究

Research on energy management of energy storage quasi-Z-source photovoltaic grid-connected system

针对储能型准Z源光伏并网系统能量源多、能量流动方式复杂问题,文章提出一种以实时功率值为工作模式切换标准,且带有经济优化调度的新型能量管理方式。根据不同的能量流动方式将系统划分为两大类共6种工作模式,结合各功率源实时功率值和蓄电池荷电状态值设计能量管理方式,设定各工作模式切换判断条件,制定相应的并离网控制方式,并采用带惯性权重的粒子群算法对系统进行经济优化调度。MATLAB/Simulink仿真实验结果表明,在各功率源实时功率变化时,系统各工作模式间切换顺利,且切换前后系统稳定运行,优化算法在一定程度上提高了系统经济效益。

According to solve the problems of multi-energy sources and complex energy flow modes in energy storage quasi-Z-source photovoltaic grid-connected system,a new energy management mode based on real-time power value as the switching standard of working mode is pro-posed,and an economic optimal dispatch is carried out on this basis.The working principle of quasi-Z-source inverter is analyzed,and the mathematical model of quasi-Z-source photovoltaic grid-connected system with energy storage is established.According to the different energy flow modes,the system is divided into two categories and six working modes.The energy management mode is designed by combining the real-time power value of each power source and the state value of battery charging.Set the judgment conditions for switching of each working mode,and formulate the corresponding off-line control mode.PSO algorithm with inertia weight is used to optimize the economic dispatch of the system.The simulation results of MATLAB/Simulink show that when the real-time power of each power source changes,the switching between different modes of the system is smooth and the system runs steadily before and after switching.The optimization algorithm improves the economic efficiency of the system to a certain extent and meets the design requirements.The accuracy and feasibility of the proposed energy management method are verified,which has theoretical guidance value for engineering application.