基于模拟状态信息的虚拟操作场景重构及微电网自适应控制设计

Virtual Operation Scenario Reconstruction and Microgrid Adaptive Control Design Based on Simulated State Information

母线电压对直流微电网系统的安全稳定运行至关重要。双向直流变换器调压过程呈现不确定、非线性和强耦合等特性,同时,传感器故障导致系统可控性显著下降。这些复杂因素极大降低了系统动态变化下的母线电压稳定性。针对以上问题,首先借助状态反馈线性化技术构建虚拟操作场景,并设计估计器模拟状态信息对虚拟场景进行系统性重构。其次利用重构状态信息,将自适应控制方法和反步法相结合,得到自适应非线性控制方案,有效保证系统在外界复杂因素和内部故障出现时安全稳定运行。最后,MATLAB/Simulink仿真结果验证了所提方案的有效性。

The bus voltage plays a key role in the safe and stable operation of the DC microgrid system. The voltage regulation process of the bidirectional DC converter presents the characteristics of uncertainty, nonlinearity and strong coupling. Meanwhile, the controllability of the system is significantly decreased due to sensor failure. These complicated factors greatly reduce the stability of the bus voltage under the dynamical changes of the system. To solve these problems, firstly, the virtual operation scenario is constructed with the help of the state feedback linearization technique, and an estimator is designed to simulate the state information to reconstruct the virtual scenario systematically. Secondly, by using the reconstructed state information, the adaptive control method and the backstepping method are combined to obtain an adaptive nonlinear control scheme, which effectively ensures the safe and stable operation of the system in case of the complicated external factors and internal fails. Finally, the MATLAB/Simulink simulation results verify the effectiveness of the proposed scheme.