Control parameters optimization of three-level neutral-point clamp rectifier for EAST low-frequency resonance suppressor

摘要

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.