不同控制策略下定子双绕组感应发电机稳压效果与运行特性分析

摘要

针对基于两状态优化开关表的直接功率控制策略的不足,提出了基于三状态优化开关表的直接功率控制策略(IDPCS).在此基础上,在定子双绕组感应发电机(DWIG)轻载建压、转速变化及负载突变工况下,针对IDPCS与滞环电流控制策略(HCCS)的动态和静态稳压控制效果进行了对比分析,进而对DWIG在上述2种控制策略下的空载调节特性、负载调节特性及效率特性进行了比较.结果表明,无论采用何种控制策略,DWIG均能实现建压,在转速变化、负载突变等工况下均能实现恒压输出,且DWIG运行特性的变化规律一致;HCCS的动态与静态稳压控制效果均优于IDPCS,且随转速升高两者的稳压控制效果均逐渐改善;与HCCS相比,采用IDPCS可使DWIG效率更高,尤其在高速情况下.%Aiming at the deficiency of direct power control based on two-state optimal switching table,an IDPCS(Improved Direct Power Control Strategy) based on three-state optimal switching table is proposed.The dynamic and static voltage stabilizing effect is compared between IDPCS and HCCS(Hysteresis Current Control Strategy) for DWIG(Dual stator-Winding Induction Generator) under different operating conditions:light load,variable speed and sudden load change.The no-load regulation characteristic,load regulation characteristic and efficiency characteristic of DWIG are further compared between IDPCS and HCCS.Results show:the DWIG,with either control strategy,can build up the voltage,maintain the constant output voltage in the operating conditions of variable speed and sudden load change,and has the same rule of operating characteristics variation;the dynamic and static voltage stabilizing effect of either control strategy is gradually improved with the increase of speed;the voltage stabilizing effect of HCCS is better than that of IDPCS;the efficiency of DWIG under HCCS is lower than that under IDPCS,especially at high speed.