一种适用于直流微电网的改进型电流负荷分配控制策略  

An Improved Load Current Sharing Control Method in DC Microgrids

作　　者：杨捷[1] 金新民[1] 吴学智 江晨 

机构地区：[1]国家能源主动配电网技术研发中心(北京交通大学),北京市海淀区100044 [2]北京电动车辆协同创新中心,北京市海淀区100044

出　　处：《中国电机工程学报》2016年第1期59-67,共9页Proceedings of the CSEE

基　　金：中央高校基本科研业务费专项资助(2014YJS121)~~

摘　　要：实现DG间电流负荷合理分配是微电网重要控制目标,直流微电网中通常采用可靠性、可扩展性以及经济性较好的I-V下垂控制作为负荷分配方法。然而,在实际微电网系统中,由于线路阻抗的存在导致I-V下垂曲线中电压电流相互影响,进而导致分配精度降低。为此,本文提出一种新的下垂控制,通过引入电压变化率V替代电压V在下垂中的地位,减少电压电流间影响,使电流负荷分配精度得以改善;同时,文中还引入V归零控制器对所提下垂控制进行补偿,以实现输出电压稳定。最后,稳定性分析和实验结果均验证了所提方法的可行性和有效性。Realizing current load sharing properly among distributed generations（DGs） is one of important control objectives in microgrids. I-V droop control is widely used in DC microgrids due to its high reliability, extendibility and economy. In practical DC microgrids, however, the existence of line impedance results in the higher coupling between voltage and current in I-V droop curve. Therefore, this paper proposes a new droop control method to address this issue. The proposed control can avoid this interlocking dependence by introducing an intermediate variable change rate of output voltage V to droop curve instead of V. Meanwhile, a restoration control is developed to maintain the voltage magnitude at the steady state. Finally, stability analysis experimental results are used to validate the proposed droop control method.

关 键 词：直流微电网 线路阻抗 电流负荷分配 下垂控制 V归零控制器 

分 类 号：TM71[电气工程—电力系统及自动化]