全数字控制的锂电池储能并网系统的设计与实现

设计了一种锂电池储能并网系统,以SKiiP功率模块作为主要功率器件,采用DSP-FPGA的全数字控制方式,完成锂电池储能系统的充放电功能。根据系统的特点,整个系统采取分层控制策略,并网系统能完成对锂电池储能系统的恒流/恒压充电,同时双向功率流动的变换器能向电网反馈能量以满足电网功率峰值需求。采用SVPWM技术,并在同步旋转坐标系下实现系统电流解耦控制和高功率因数运行。实验结果表明,按照所提方法设计的锂电池储能并网系统能够稳定地并网运行,整个系统结构紧凑,可靠性高。

Design and implementation of grid-connected lithium battery energy storage system under total digital control

A grid-connected lithium battery energy storage system is designed based on SKiiP(SEMIKRON integrated intelligent Power) module,which exchanges energy with grid under the total digital control based on DSP-FPGA.The control system adopts hierarchical structure.The grid-connected system charges the lithium battery in constant current or constant voltage mode,and the bi-directional converter feeds the power back to grid during peak periods.The space vector PWM technique is applied to realize the decoupled current control in the synchronous rotating frame and the system operation with high power factor.The designed grid-connected energy storage system has compact structure and experimental results show its stable and reliable operation.