Augmentation of State Feedback Control and Integral Action for Stabilization Issues in Islanded DC Microgrid

Naveen Kumar Baghel, Tarakanath Kobaku, R. Jeyasenthil, P. Ghorai, Chinmay Rajhans
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Abstract

When the switched-mode power electronic converters are tightly regulated with feedback control, they exhibit negative incremental impedance due to Constant Power Loads (CPLs) behavior. As a consequence, the output voltage exhibits growing oscillations leading to instability. This work addresses the problem of handling this instability issue using a state feedback control approach to increase the damping and ensure stability. To attain zero steady-state error, an integral action is augmented to the state feedback control. The design of a state feedback control with integral action has been carried out using the classical pole-placement method. The poles are placed at the desired locations using Butterworth polynomial such that the proposed controller stabilizes the overall system. To validate the effectiveness of the proposed state feedback control with augmented integral action for CPL, the simulations are carried out using MATLAB/Simulink on a buck-type DC-DC converter. The results show that the converter voltage is stabilized and in addition, exhibits improved dynamic performance for external disturbances such as sudden changes in the input voltage.
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孤岛直流微电网稳定问题的增强状态反馈控制与积分作用
当开关型电力电子变换器采用反馈控制严密调节时,由于恒功率负载(cpl)的特性,它们表现出负增量阻抗。结果,输出电压表现出越来越大的振荡,导致不稳定。这项工作解决了使用状态反馈控制方法来处理这种不稳定性问题,以增加阻尼并确保稳定性。为了达到零稳态误差,在状态反馈控制中增加了一个积分作用。采用经典的极点配置方法,设计了具有积分作用的状态反馈控制。极点被放置在期望的位置使用巴特沃斯多项式,使所提出的控制器稳定整个系统。为了验证所提出的带增广积分作用的状态反馈控制对CPL的有效性,利用MATLAB/Simulink对buck型DC-DC变换器进行了仿真。结果表明,变换器电压稳定,且对输入电压突变等外部干扰具有较好的动态性能。
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