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为解决大功率交流传动系统中因功率器件的低开关频率所导致的PWM波形谐波大的问题,提出了一种基于新型优化同步调制的定子磁链轨迹跟踪控制算法,离线状态下以电机电流谐波总和最小为优化目标求得逆变器在各种分频数下的优化开关角,从而得到定子磁链的运行轨迹;系统正常工作过程中实时计算出定子磁链轨迹的各个特征门槛值,根据观测到的电机定子磁链值与各个特征门槛值进行闭环控制,实现基于定子磁链轨迹跟踪控制的同步调制算法。仿真及试验验证了所提算法的正确性和可行性。
In order to solve the problem of large harmonics of PWM waveform caused by low switching frequency of power devices in high power AC drive system, a new algorithm based on novel optimized synchronous flux tracking control is proposed. In offline state, the motor current The sum of the harmonics is minimized to obtain the optimal switching angle of the inverter under various frequency divisions for the optimization objective, so as to obtain the running track of the stator flux linkage; and all the characteristic thresholds of the stator flux trajectory are calculated in real time during the system’s normal operation , The closed-loop control is carried out according to the observed stator flux linkage value and each characteristic threshold to realize the synchronous modulation algorithm based on stator flux tracking control. Simulation and experiment verify the correctness and feasibility of the proposed algorithm.