摘要
介绍了三相电压型PWM整流器的数学模型,以及传统直接功率控制的基本原理和系统组成,分析了其所采用的开关表存在的不足。提出了一种新的直接功率控制方法,该方法采用新的开关表,功率内环采用简单的PI算法,省去两滞环比较器,易于实现。系统在Simulink下的仿真结果表明,与传统直接功率控制相比,该方法可以得到更高的功率因数、更低的输出直流纹波系数。
The model of 3 -phase voltage source PWM rectifier and the principle of classical direct power control system were presented. Then, the shortage of the switch table that used in the classical DPC system was figured out. Afterwards, a novel DPC strategy with novel switch table was proposed. In the proposed method, the simple PI control is used in the inner loop, instead of the hysteresis comparators that used in the classical DPC. The simulation results under Simulink show that, compared with the classical DPC, the proposed method works with higher power factor and lower output DC voltage ripple.
出处
《电气传动》
北大核心
2011年第3期38-40,45,共4页
Electric Drive
