基于等效参考电流控制的低压微电网控制策略  

An Equivalent Reference Current Based Control Strategy for Low-Voltage Microgrid

作　　者：刘建华[1] 杨洪耕[1] 张洁[1] 李坦[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2014年第6期1529-1535,共7页Power System Technology

摘　　要：在PQ控制和V/f下垂控制的基础上提出了微电网2种运行模式下均适用的等效参考电流控制法。对于电压幅值和频率,将其参考值与各自实际运行值的偏差分别引入到参考电流的dq轴分量中,通过对引入偏差的控制使分布式电源在微电网2种运行模式下具有相应的运行特性。该方法避免控制方法因运行模式变化而切换,确保了运行模式间的平滑转换;还能有效改善孤岛运行时电压和频率的动态调节效果,实现并网运行时的直接功率控制。同时,针对该控制方法设计了同步并网控制器,实现了微电网的平滑并网。仿真和实验结果证明了所提控制策略的可行性。Based on PQ control and V/f droop control,an equivalent reference current based control strategy for low-voltage microgrid,which is suitable for both operating modes of microgrid,namely the grid-connected operating mode and island operating mode,is proposed.The deviations between the referential values of both amplitude and frequency of voltage and their actual values are led into the d-q axis components respectively,and the control of the led in deviations makes the distribution generations （DG） possessing corresponding operating characteristics under the two operating modes of microgrid.Using the proposed method,the switching between operating modes due to the change of operating mode can be avoided,thus the smooth transition between operating modes can be ensured; besides the dynamic adjustment effects of voltage and frequency can be effectively improved under the island operation of microgrid,thus the direct power control under grid-connected operating mode can be implemented.Meanwhile,a synchronization controller for grid-connection of microgrid is designed for the proposed control method,and the smooth gird-connection of microgrid can be achieved.

关 键 词：分布式电源 低压微电网 孤岛模式 并网模式 同步并网控制 

分 类 号：TM721[电气工程—电力系统及自动化]