摘要
在孤岛微电网模型中,由于分布式发电(DG)单元等效线路阻抗不匹配,传统下垂控制无功功率分配精度较低。为此,这里提出一种无互联通信的孤岛微电网无功功率均分的控制策略。首先,通过功率分配级和功率再分配级可在本地控制器中分别得到总有功功率和平均无功功率。进而通过功率平衡级实时补偿电压,修改电压-无功下垂电压参考值,实现无功功率的合理分配。此方法无需利用实时通信系统交换DG之间的信息,仅利用中央控制器发出的低带宽同步信号触发,仍保持了微电网各DG单元“即插即用”的特性。最后,通过仿真和实验验证了所提出的控制策略理论的有效性。
In islanded microgrid model,the line impedance between the DG units are always unmatched,which can result in low precision of reactive power sharing by using the traditional droop control.Therefore,a reactive power sharing control strategy in island microgrid without interconnected communication is proposed.The total active power and average reactive power are respectively obtained by the power distribution stage in and secondary power distribution stage in the local controller.The power balancing statge is used to compensate the voltage in real time,modify voltage-reatcive power droop voltage reference value to achieve rational distribution of reactive power.This method does not need to use the real-time communication system to exchange the information between DG and only uses the low-bandwidth synchronization signal triggering from central controller,and still maintains the "plug and play" characteristics of DG units in microgrid.Finally,simulations and experiments verify the validity of the proposed control strategy.
作者
崔树银
谈淑娟
蔡杭谊
米阳
CUI Shu-yin;TAN Shu-juan;CAI Hang-yi;MI Yang(Shanghai University of Electric Power,Shanghai 200090,China)
出处
《电力电子技术》
CSCD
北大核心
2022年第9期111-115,共5页
Power Electronics
基金
国家自然科学基金(61873159)。
关键词
微电网
下垂控制
无功均分
即插即用
microgrid
droop control
reactive power sharing
plug and play
