办公用光伏直流供电系统研究

Research on a Photovoltaic DC Power Supply System for Offices

对办公场所常用电子设备笔记本电脑、台式电脑、手机和数码相机后级供电电路的结构进行了研究,分析了其使用直流供电取代交流供电的优点和可行性。在此基础上,提出了一种由光伏电池、蓄电池、AC/DC模块、DC/AC模块和直流负载组成的直流供电系统。光伏电池作为主供电单元通过直流稳压电路与直流母线相连,通过实时调节其输出功率,可以维持母线电压稳定;蓄电池模块通过双向Boost-BUCK电路与直流母线连接,可以根据母线电压的变化实时进行充放电控制;AC/DC模块作为备用与直流母线相连接,可以实时检测母线电压变化,决定其是否启动;DC/AC模块可以对一般的交流负荷供电;直流负载多通过DC/DC变换器与母线连接吸收电能。

This paper discusses the structure of the last-stage power supply circuit of common electronic equipment in office space,such as laptop,desktop,mobile phone and digital camera. It analyses the advantages and feasibility of DC power supply＇s substitution for AC supply. On this basis,a DC power supply system consisting of photovoltaic cells,batteries,AC/DC module,DC/AC module as well as DC load is put forward. The photovoltaic cell,as main power supply unit,is connected with the DC bus via a DC regulator circuit.The bus voltage can be kept stable by means of real-time adjustment of the output power of the photovoltaic cell. The battery module is connected with the DC the bus via a bidirectional Boost-BUCK circuit,and real-time charge and discharge control is realized according to variations of the bus voltage. The AC/DC module,connected with the DC bus as a backup,can detect variations of the bus voltage on a real-time base to decide whether it should be started or not. The DC/AC module can supply power to ordinary AC loads and most DC loads are connected with the bus via DC/DC converters to absorb electric energy.