| 引用本文: | 严骏华,牟龙华,朱国锋.适用于光伏发电的多相并联Boost变换器相数调整电流的研究[J].电力自动化设备,2016,36(10): |
| YAN Junhua,MU Longhua,ZHU Guofeng.Research on phase shedding current of multiphase parallel Boost converter for PV system[J].Electric Power Automation Equipment,2016,36(10): |
|
| 摘要: |
| 当光伏发电系统的直流变换环节采用多相并联拓扑结构时，存在光伏电池输出电压变化导致并联系统的相数调整电流发生偏移，系统运行效率降低的问题，为此提出一种基于变换器效率模型的相数调整电流修正算法。以Boost变换器为例，建立Boost变换器的效率模型，推导出系统整体效率优化的相数调整电流；分析输入电压变化对相数调整电流的影响；根据效率模型的模型参数，给出针对输入电压变化的相数调整电流修正算法，并分析了修正算法的误差来源及其影响程度。仿真和实验结果表明，与不考虑光伏电压变化的相数调整策略相比，采用修正算法的相数调整策略可以有效提高并联系统运行效率。 |
| 关键词: 多相并联变换器 效率模型 光伏电池 相数调整电流 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51407128）；浙江省科技计划项目（2013C01063） |
|
| Research on phase shedding current of multiphase parallel Boost converter for PV system |
|
YAN Junhua, MU Longhua, ZHU Guofeng
|
|
Department of Electrical Engineering，Tongji University，Shanghai 201804，China
|
| Abstract: |
| When the DC conversion section of PV system adopts the multiphase parallel structure，the output voltage variation of PV battery may cause the efficiency decrease of parallel system due to the phase shedding current shift，aiming at which，a phase shedding current modification algorithm is proposed based on the efficiency model of converter. With multiphase Boost converter as an example，its efficiency model is built and its phase shedding current for optimizing the overall efficiency of system is deduced. The effect of input voltage variation on the phase shedding current is analyzed. A phase shedding current modification algorithm based on the parameters of efficiency model is proposed，and its error sources，as well as the corresponding influencing levels，are analyzed. The simulative and experimental results prove that，compared with the phase shedding strategy without the consideration of PV input voltage variation，the proposed algorithm improves the operational efficiency of parallel system. |
| Key words: multiphase parallel converter efficiency model photovoltaic cells phase shedding current |
