高压绕线电动机转子变频调速技术研究

Research on rotor-side frequency conversion speed regulation technology for high voltage wound-rotor motor

针对目前高压绕线电动机采用定子侧高压变频器进行变频调速存在的技术难度较大、对电力电子器件耐压值要求高、成本较高等问题,提出了一种高压绕线电动机转子变频调速技术。该技术利用转子侧电压等级低的优点,将功率变换由定子侧转移到转子侧,通过通用变频器实现对高压绕线电动机的变频调速。推导了转子变频矢量控制系统数学模型,设计了自适应全阶状态定子磁链观测器,并根据定子磁链观测值实现了转速辨识。Matlab仿真及实验结果验证了转子变频调速技术的正确性及可行性。

In view of problems of technical difficulties,high cost and high voltage requirements for power electronic components in current high voltage wound-rotor motor using stator-side high voltage inverter for frequency conversion speed regulation,a rotor-side frequency conversion speed regulation technology for high voltage wound-rotor motor was proposed. The technology transfered power transformation from stator side to rotor side taking advantage of low voltage level on rotor side,frequency conversion speed regulation of high voltage wound-rotor motor was realized through general frequency converter.Mathematical model of vector control system for rotor-side frequency conversion was deduced,and adaptive full-order state stator flux linkage observer was designed.Speed identification was realized according to stator flux linkage observation. Matlab simulation and experimental results verify the correctness and feasibility of rotor-side frequency conversion speed regulation technology.