2-Rate compensation of DC-DC boost converter for Wind Turbine applications

Abstract

A boost converter plays a crucial role in wind energy generation systems. The DC-DC boost converter is critical for adapting the variable and often low-voltage output from wind turbines to a stable, higher voltage level suitable for further processing, storage, or grid integration. It plays a key role in maximizing energy capture, improving power quality, and ensuring the efficient operation of wind energy systems. However, the presence of a right-half-plane (RHP) zero is a significant limitation in boost converters, especially in control design and system performance. The right-half-plane zero in a boost converter introduces significant challenges, particularly in terms of control bandwidth, stability, and response time. These limitations affect the overall performance of the boost converter, requiring careful consideration and often complex compensation strategies to mitigate their impact. In this regard, it has been observed in literature that periodic or multi-rate controllers are capable of mitigating the effect of such NMP zeros by means of their loop-zero placement capabilities. This work presents an two-loop control topology that comprises of a PI controller in the inner loop and a generalized 2-rate controller at the outer loop. The robustness as yielded by the 2-rate controller is found to be much better than the PI controller ones. Finally, the proposed methodology is implemented in an Wind Turbine Generating system via MATLAB Simulink environment