基于无源性的光伏DC/DC变换器的全局滑模控制

Global Sliding Model Control Based on Passivity of Photovoltaic DC/DC Converter[HS)]

摘要:

在光伏发电系统中,当其受环境影响时,系统输出电压及功率不稳定,主要由DC/DC变换器来实现其过程能量转换,因此研究高效的DC/DC变换器控制方法具有重要意义；引入了一种满足无源性的DC/DC变换器,同时引入一种新的指数趋近律,设计全局滑模控制策略；所设计控制方法不仅确保了系统状态的稳定性,而且提高了系统的鲁棒性,减弱了DC/DC变换器的抖动现象；并以双向Buck变换器为例,通过Matlab仿真验证了所设计控制器的有效性。

Abstract:

In photovoltaic power generation system, the output voltage and power of the system are not stable, the DC/DC converter plays an important role in the process of energy conversion, the high efficiency DC/DC converter control method is of great significance. Putting forward a kind of DC/DC converter can satisfy the passivity, at the same time introducing a new exponential reaching law, to design the global sliding mode control strategy. The design control method not only ensure the stability of the system state, and improve the robustness of the system, abate the dithering phenomenon of DC/DC converter; With bidirectional Buck converter as an example, verifying the effectiveness of the designed controller through MATLAB simulation.