基于电池电流前馈控制策略的两级式双向储能变流器控制

Two-Stage Bi-Directional Energy Storage Converter Control Based on Battery Current Feed-forward Control Strategy

当下储能发展的速度以及多样性催生了多种不同电压等级的储能电池,所以能适应不同电压等级电池组的双向储能并网系统是当下分布式发电发展的关键,而由于直流的DC/DC变流器具有升压功能,所以将直流斩波与逆变背靠背设计能够满足此条件,但是由于在电池充放电过程中直流母线电压存在严重暂态波动,严重降低了储能系统的稳定性。为此本文针对背靠背的储能变流控制系统在充放电过程中所出现的暂态性提出一种基于电池参考电流前馈补偿控制策略,并采用不同电压等级的电池接入系统进行仿真验证。

At present,the speed and diversity of energy storage development have led to a variety of energy storage batteries with different voltage levels,so it can adapt to the bidirectional energy storage of batteries with different voltage levels.Grid-connected system is the key to the development of distributed generation.Because DC/DC converter has boost function,the back-to-back design of DC chopper and inverter can meet this requirement.However,due to the serious transient fluctuation of DC bus voltage during battery charging and discharging,the stability of energy storage system is seriously reduced.For this reason,a feed-forward compensation control strategy based on battery reference current is proposed for the transient of back-to-back energy storage converter control system during charging and discharging.The effectiveness of the control strategy is verified by simulation analysis.Finally,the strategy is further verified by using different voltage levels on the battery side.Effectiveness.