Microchip連接電網的太陽能微逆變器220V參考設計
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圖3.農村家庭太陽能系統框圖
圖4.模塊化逆變器(微逆變器)系統框圖
圖5.太陽能微逆變器系統兩級拓撲圖
圖6.太陽能微逆變器參考設計框圖
圖7.交錯式反激轉換器電路
圖8.連接電網的太陽能微逆變器框圖
圖9.連接電網的太陽能微逆變器參考設計板外形圖
This reference design demonstrates the flexibility and power of SMPS dsPIC? Digital Signal Controllers in Grid connected power conversion systems. This reference design works with any photovoltaic (PV) panel of maximum 220 Watts having open circuit voltage between 25V to 55V DC. This reference design ensures maximum power tracking for PV panel voltage between 25V to 45V DC. Two versions of this reference design is available to support 110V and 220V Grid.
This reference design is implemented using a single dsPIC33F “GS” digital-power DSCs from Microchip that provides the full digital control of the power conversion and system management functions. As shown in this reference design the dsPIC33F ‘GS’ devices enable designers to easily and cost effectively create products using advanced switching techniques that lower switching losses and enable efficiencies as high as 94%. Grid-Connected Solar Micro Inverter Reference Design is royalty free when used in accordance with the licensing agreement.
太陽能微逆變器參考設計主要特性:
Peak efficiency of up to 94%
Beta build peak efficiency of up to 92%
Output current THD 5%
Power factor >0.95
Maximum power point tracking
Grid voltage and frequency tracking
Protection against various current and voltage faults
System Islanding to detect grid failure
Full Digital Control
Specifications:
Micro Inverter for individual PV Module up to 220W
Wide PV Panel voltage : 25V to 55V DC
Maximum Power Point Tracking voltage: 25V to 45V
Maximum DC short circuit current : 10A
Grid Frequency range :
47 – 53 Hz for 220V systems
57 – 63 Hz for 110V systems
Grid voltage range :
90V – 140V for 110V systems
180V – 264V for 220V systems
圖10.太陽能微逆變器參考設計電路圖(1)
圖11.太陽能微逆變器參考設計電路圖(2)
圖12.太陽能微逆變器參考設計電路圖(3)
圖13.太陽能微逆變器參考設計電路圖(4)
圖15.太陽能微逆變器參考設計電路圖(4)
圖16.太陽能微逆變器參考設計板PCB布局圖(頂層)
圖17.太陽能微逆變器參考設計板PCB布局圖(底層)
詳情請見:
http://ww1.microchip.com/downloads/en/AppNotes/01338D.pdf
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