Microchip连接电网的太阳能微逆变器220V参考设计

Tracker (MPPT). It also involves PV output voltage ripple at the terminals of the PV module being sufficiently small, in order to operate around the MPP without too much variation in PV Current.


图3.农村家庭太阳能系统框图

图4.模块化逆变器(微逆变器)系统框图

图5.太阳能微逆变器系统两级拓扑图

图6.太阳能微逆变器参考设计框图

图7.交错式反激转换器电路

图8.连接电网的太阳能微逆变器框图

图9.连接电网的太阳能微逆变器参考设计板外形图

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-powerDSCs 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.

太阳能微逆变器参考设计主要特性:

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

图10.太阳能微逆变器参考设计电路图(1)

图11.太阳能微逆变器参考设计电路图(2)

图12.太阳能微逆变器参考设计电路图(3)

图13.太阳能微逆变器参考设计电路图(4)

图15.太阳能微逆变器参考设计电路图(4)

图16.太阳能微逆变器参考设计板PCB布局图(顶层)

图17.太阳能微逆变器参考设计板PCB布局图(底层)

详情请见:
http://ww1.microchip.com/downloads/en/AppNotes/01338D.pdf