This paper introduces an enhanced chopper-buffer circuit tailored for current source converter (CSC)-based doubly fed induction generator (DFIG) systems, aiming to significantly improve their low-voltage ride-through (LVRT) performance. The proposed design features a resistor-capacitor (RC) branch integrated with controllable switches and connected in parallel with the DC link. This configuration mitigates overcurrent stress on the DC link inductor and refines the dynamic behavior of the DC current during voltage dips.

In Simulation, the performance of the CSC-based DFIG system is evaluated under varying levels of DC link inductance. The results demonstrate that the chopper effectively prevents inductor overcurrents, while the buffer reduces current oscillations and enhances system stability. The combined use of both circuits enables reliable LVRT performance even with significantly reduced inductance values.

Simulation comparisons across different configurations—no chopper, with chopper only, and with both chopper and buffer—highlight the superiority of the proposed solution. Notably, the system equipped with both circuits achieves the smoothest and most stable active and reactive current responses, all while complying with the relevant Grid Code requirements. Moreover, analysis confirms that the proposed circuit design allows for a substantial reduction in DC link inductance energy without compromising system compliance or dynamic performance.

These findings underline the practical feasibility of deploying a CSC-based DFIG system with a chopper-buffer circuit to minimize the size of the DC inductor, which is significantly reduce the cost and could be an alternative to conventional voltage source converter (VSC) in wind turbine applications.