一种新型低压微网逆变器并联策略研究  

A New Strategy for Parallel-connected Converters in Low Voltage Microgrid

作　　者：喻景康 顾军[1] 索亚楠 罗心宇[1] 郭诚[1] YU Jingkang GU Jun SUO Yanan LUO Xinyu GUO Cheng(School of Electrical and Information Engineering,Anhui University of Science and Technology,Huainan 232001,Anhui,China)

机构地区：[1]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《电气传动》2016年第10期45-48,62,共5页Electric Drive

摘　　要：传统下垂控制未考虑线路阻抗的影响,使得逆变器并联系统的稳定性大大降低以及功率分配不合理。因此,研究一种带有虚拟阻抗的新型控制策略,该策略采用等效参考电流,能有效地改善系统动态响应和缩小电压Ud波动范围。通过引入dq坐标系下虚拟阻抗使得低压微电网中有功无功解耦并改善功率分配效果。仿真实验结果表明,该策略能较好地解决逆变器间环流问题,达到优良的功率分配效果以及有效地降低电压波动范围。Traditional droop control method has not considered the influence of line impedance,so the stability of inverter parallel system is greatly reduced and the power allocation is not reasonable. As a result,a new control strategy with virtual impedance was studied on. The strategy adopted equivalent reference current,which could effectively improve the system dynamic response and narrow the scope of voltage fluctuation. By introducing virtual impedance under dq coordinate system the active power and the reactive power in low voltage microgrid were decoupled and power distribution effect was improved. Simulation results show that this strategy can better solve the current problem between inverter circulation,achieve good effect of power distribution and reduce the degree of voltage fluctuation effectively.

关 键 词：等效参考电流 虚拟阻抗 下垂控制 电压波动 功率分配 

分 类 号：TM464[电气工程—电器]