带整流桥负载的定子双绕组感应发电机系统宽转速运行时的稳态特性

Characteristic of the Dual Stator-winding Induction Generator System Operating Over a Wide Speed Range

针对带整流桥负载的定子双绕组感应发电机(dual stator-winding induction generator,DWIG)系统在宽转速范围内运行时的稳态运行特性进行了研究。建立了带电容滤波的整流桥负载的DWIG系统数学模型,指出整流桥负载是具有容性的非线性负载,提出了采用数学仿真的方法进行励磁电容的选取以降低变换器容量。采用控制绕组端电压定向的控制策略,对一台18kW、270V带整流桥负载的DWIG系统在变速时稳态规律进行了仿真和实验研究,结果表明发电机系统能够在4000-8000r/min宽转速范围内稳定运行,控制绕组最大功率为功率绕组额定输出功率的37%,控制绕组电流的最大有效值为功率绕组电流额定值的21%,与输出功率比较,实现了大幅度降低控制侧变换器容量的目的。

The characteristic of the dual stator-winding induction generator （DWIG） with 1% rated load and rated load, which operating over a wide speed range, is studied in this paper. Analysis of the DWIG with diode bridge load is presented. The mathematic simulation is employed to find the optimal value of exciting capacitor bank to reduce the volume of the static excitation regulator, considering the non-linear diode bridge rectifier with a DC capacitor filter. The control winding voltage oriented scheme is employed to realize the dynamic regulator during variable speed working with different loads. The 18 kW 270 V prototype DWIG control system based on the DSPACE is developed. Simulation and experiment results validate good performance of the DWIG working over a wide speed range and the capacity of the excitation regulator is maintained at a small scale.