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独立光伏电源控制器建模及高动态性能研究

, PP. 75-82

Keywords: S4R,功率调节单元,局部开关,EMI,延迟驱动,超前网络

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Abstract:

光伏供电系统一般采用太阳电池阵-蓄电池联合供电模式,空间独立发电系统一般采用S4R作为功率调节单元(PCU)。采用局部开关阻抗失配法建立电源控制器模型,采用无反馈型延迟驱动解决了由PV输出寄生电容带来的开通时刻EMI问题,相比有源限流电路,该设计的无限流电感、无采样电阻,一定程度上简化了驱动电路的设计;而延迟驱动技术降低了环路的相位裕度,采用超前网络反馈采样环节来提高控制器带宽附近的相位裕度。仿真及实验证实采用超前网络反馈环节技术的S4R的动态性能优于仅采用延迟驱动技术的S4R,并发现系统带宽,开关频率及输出滤波电容大小互相制约。

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