基于储能功率转换系统的并离网运行控制策略

摘要

According to the requirement that a convert based on the energy storage PCS needs to work in the grid-connected mode and the islanded mode,the control strategy of the two modes is studied for an inverter withthe three-phase T-type structure as the main circuit topology. In the grid-connected mode,grid voltage is tracked by a phaselock loop (PLL) and the PI controller is also utilized for the current control. The capacitor voltage outer loop and inner inductor current loop are used in the islanded mode,thus theoutput voltage is effectively controled.The mathematical mode of the whole system and those control algorithms in two operating modes are discussed,the system performance iscarried out and verified in the experimental prototype machine of 100 kW full digital control experiments.%基于储能功率转换系统需要逆变器工作在并网/离网两种工作模式下, 针对三相T型结构作为主电路拓扑逆变器研究了并/离网工作模式的控制策略. 并网模式下利用锁相(PLL)技术跟踪电网电压的相位,并且用PI控制器来实现并网电流的控制. 离网模式下采用电容电压外环和电感电流内环的双闭环控制方式,可以实现输出电压的有效控制. 在完成了系统的状态空间数学建模基础上,并且对系统在并网、离网两种运行模式下的控制算法,在搭建的100 kW全数字控制的实验样机上进行了实验和验证.