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中点电位的平衡控制是中点钳位式三电平拓扑安全可靠运行的关键,但现有文献均未能通过建立精确的数学模型对中点电位漂移的物理机理进行精确分析,控制参数整定困难。该文建立了考虑未知干扰和参数摄动影响的中点钳位式三电平D-STATCOM的精确数学模型,利用重复控制与无源性控制相结合的方法实现了基于鲁棒L_2性能准则的电流控制器设计,精确分析了参数摄动导致的有功能量分配不均是中点电位漂移的根本原因。通过零序分量注入,利用直流侧上下端电容器之间的有功能量交换实现了中点电位的平衡控制。通过仿真以及1.14 k V,±400 k Var煤矿供电系统的工程应用,验证了该文所建立模型的准确性以及所提控制算法的可行性和有效性。
The balance control of mid-point potential is the key to the safe and reliable operation of mid-point clamp three-level topology. However, none of the existing literature accurately analyzes the physical mechanism of mid-point potential drift by establishing an accurate mathematical model. The control parameter setting difficult. In this paper, an accurate mathematical model of mid-point clamped three-level D-STATCOM considering the influence of unknown disturbance and parameter perturbation is established. By using the combination of repetitive control and passive control, the robust L_2 performance criterion The design of the current controller accurately analyzes the fundamental reason that the uneven distribution of active energy caused by parameter perturbation is the midpoint potential drift. Through the zero-sequence component injection, the neutral point potential balance control is realized by the active energy exchange between the upper and lower side DC capacitors. Through the simulation and engineering application of 1.14 k V and ± 400 k Var coal mine power supply system, the accuracy of the model and the feasibility and effectiveness of the proposed control algorithm are verified.