The low-frequency resonance suppressor effectively reduce the low-order harmonics and resonance amplification generated by the EAST poloidal field power system during the operation. This article takes the control parameters of the three-level neutral-point clamp rectifier in the low-frequency resonance suppression device as the research object to reduce the steady-state delay of the system and to ensure the stability of the DC side voltage balance. The system model of the three-level midpoint clamp rectifier in $dq$ rotating coordinate system is constructed to study the effect of various control parameters on the stability of the rectifier system. Furthermore, combined with variation regularity of system eigenvalue, the control parameters of the rectifier are optimized, and the anti-interference ability, dynamic performance and robustness of rectifier system are improved. Finally, the correctness and effectiveness of the control parameters optimization are verified through RT-LAB simulation.

低频谐振抑制器有效地降低了运行过程中EAST极场电源系统产生的低次谐波和谐振放大。本文以低频谐振抑制装置中的三电平中性点钳位整流器的控制参数为研究对象，以减少系统的稳态延迟，并确保直流侧电压平衡的稳定性。三电平中点钳位整流器的系统模型$dq$构建旋转坐标系以研究各种控制参数对整流器系统稳定性的影响。此外，结合系统特征值的变化规律，优化了整流器的控制参数，提高了整流器系统的抗干扰能力，动态性能和鲁棒性。最后，通过RT-LAB仿真验证了控制参数优化的正确性和有效性。