摘要
To improve the living standards,economical efficiency and environmental protection of isolated islands,remote areas and other areas with weak electric power facilities construction,a multi-source independent microgrid system is studied,including diesel generators,photovoltaic power generation system,wind power generation system and energy storage unit.Meanwhile,in order to realize the voltage and frequency stability control of AC bus of multisource microgrid,the virtual synchronous generator technology is introduced into the energy storage unit,and the charge and discharge control of the energy storage battery are simulated as the control behavior characteristics of synchronous motors,so as to provide damping and inertia support for the microgrid.The operation mode and control principle of each energy subsystem are expounded and analyzed.The algorithm principle of virtual synchronous generator and the control method of energy storage unit are given.Then,the working modes of the microgrid system under different environmental conditions are analyzed,and the multi-source microgrid system simulation model is built based on MATLAB/Simulink.The simulation results show that the microgrid system can run stably under different working modes and the energy storage unit using the virtual synchronous generator technology can provide good voltage and frequency support for the microgrid system.Finally,experiments verify the supporting function of energy storage unit on the voltage and frequency of the microgrid system.
为提高孤立岛屿、偏远地区等电力设施建设薄弱地方的生活水平、用电经济性和环保性,研究了一种多源独立微网系统,包含柴油发电机、光伏发电系统、风力发电系统和储能单元。同时,为实现多源微网交流母线电压和频率的稳定控制,在储能单元中引入虚拟同步机技术,将储能电池的充放电控制模拟成为具有同步电机的控制行为特征,从而为多源微网提供阻尼和惯量支撑。分析了各子系统的运行方式和控制原理,给出了虚拟同步机的算法原理与储能单元的控制方法,以及不同环境条件下微网系统工作模式。基于MATLAB/Simulink搭建多源微网系统仿真模型,仿真结果表明:微网系统在不同工作模式下可稳定运行,采用虚拟同步机技术的储能单元可以为微网系统提供良好的电压和频率支撑。实验验证了储能单元对微网系统电压和频率的响应和支撑功能。
基金
supported by the Science and Technology Research&Development Project of China Construction Second Engineering Bureau Ltd.(No.91110000100024296D180009)。
