基于空间电压矢量调制的定子双绕组感应发电机系统电压控制技术

Voltage Control of Dual Stator-winding Induction Generator System Using Space Vector Modulation

将空间电压矢量调制(space vector modulation,SVM)策略应用于定子双绕组感应发电机(dualstator-winding induction generator,DWIG)系统,不仅提高了直流母线利用率、降低了控制绕组侧静止励磁控制器(static excitation controller,SEC)的直流母线电压,而且有效降低了控制绕组电流谐波。该文在分析SEC数学模型的基础上,提出基于SVM的DWIG发电系统电压解耦控制策略,并对DWIG系统建压、突加突卸负载进行了仿真和实验研究,结果证明该控制策略具有良好的动静态性能。该文进一步拓展了SVM控制下的发电机转速运行范围,并用节点导纳法对该变速运行过程中的电压和电流关系进行了定量分析,实验结果验证了该方法的正确性。

A novel dual stator-winding induction generator （DWIG） system is described. The proposed DWIG consists of a standard squirrel-cage and a stator with two separate windings wound for the same number of poles, one of which powers the load and the other is fed by the static excitation controller （SEC）. Based on the mathematic analysis of the SEC, a decoupling control strategy of the DWIG system using space vector modulation （SVM） is proposed to raise the utilization rate of the SEC＇s DC voltage and meanwhile eliminate the harmonic currents. The classic working pattern of the system, involving the voltage building-up process, step load changes are carried out on the simulation and experimental platforms. Further studies reveal that the proposed generating system is well suited for the variable-speed operation, and a novel admittance method is employed to analyze the behavior of the SEC. The theory is confirmed by the experimental results.