中文摘要：

提出了一种无主从自均流的并联并网电池储能系统,并将系统中的变流器设计为双向可拓展变流结构,使其成为一四象限运行的储能系统,并且不对电网造成谐波污染,具有较高的功率因数。在此基础上,将系统的工作状态设计为蓄电池并网充电、蓄电池并网放电及应急电源3种模式,控制单元根据不同的工作模式控制各变流器的运行状态,不仅可以实现传统电池储能系统的基本功能,还能够在电网故障时作为应急电源独立使用。同时,给出了系统的控制管理策略,以达到系统稳态和暂态运行的控制目标。最后,基于电磁暂态仿真验证了该系统及其控制管理策略的有效性。

英文摘要：

This paper proposes a parallel grid-connected system of non-master-slave and current-sharing battery energy storage.The converter of the system is designed as a bi-directional extended conversion structure,so the system becomes a four-quadrant operation battery energy storage device with characteristics such as low harmonics pollution and high power factor.On this basis,the operating modes of the system are designed to three modes： battery grid charging mode,battery grid discharging mode and emergency power supply mode.According to the different working modes,the control unit controls the operating status of the converter.It can achieve basic functions of traditional battery energy storage system,as well as emergency power used independently on the grid faults.In order to achieve the control targets of steady state and transient state,the control management strategy is given.EMTDC simulation results are provided to verify the effectiveness of the proposed system and control strategy.