带CPL的直流微电网二次D稳定模糊逻辑控制

Quadratic D-stable Fuzzy Control Strategy of DC Microgrid With the CPL

围绕带恒功率负载(CPL)的直流微电网稳定运行问题,提出了一种系统性的简单方法来设计功率缓冲器的状态反馈控制器。基于分区非线性理论,带多个CPL的非线性直流微电网系统可用Takag-Sugeno型非线性模糊模型(T-S模型)描述。同时,由二次D稳定性理论,使用线性矩阵不等式(LMI)获得了保证闭环系统稳定性和期望动态性能的充分条件,当该条件满足时,闭环系统的衰减率和振荡都将限制在预定义的范围内。利用所搭建的直流微电网硬件在环实时仿真测试系统开展了对比实验研究,测试结果验证了新型控制策略与传统方案相比,在实施更简便的同时,可实现带多个CPL的直流微电网系统快速收敛性和较优的动态性能。

Focusing on problem of stable operation of DC microgrid with constant power load(CPL),a systematic and simple method is proposed to design the state feedback controller for power buffer.Based on the sector nonlinear theory,the nonlinear DC microgrid system with multiple CPL can be described by Takag Sugeno nonlinear fuzzy model(T-S model).At the same time,based on quadratic D-stability theory,sufficient conditions to guarantee the stability and expected dynamic performance of the closedloop system can be obtained by linear matrix inequalities(LMI).When the conditions are met,the decay rate and oscillation of the closed-loop system will be limited in a predefined region.The comparative experiments are carried out by using the DC microgrid hardware-in-the-loop realtime simulation test system.The test results verify that the new control strategy is easier to implement than the traditional schemes,and can achieve rapid convergence and better dynamic performance for the DC microgrid system with multiple CPL.