Parallel operation of inverters for distributed photovoltaic power supply system

Chih-Chiang Hua1, Kuo-An Liao1, Jong-Rong Lin1
1Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin, Taiwan

Tóm tắt

This paper proposes a control technique for operating two or more single phase inverter modules in parallel with no auxiliary interconnections. In the proposed parallel inverter system, all of the modules have the same circuit configuration, and each module includes an inner current loop and an outer voltage loop controls. With power sharing control, load sharing can be automatically achieved and the output current of each inverter can be accurately limited to its maximum rating. This technique uses frequency and fundamental voltage droop to allow all independent inverters to share the load in proportion to their capacities. From the simulation and experiment results, the proposed control for PVS inverters is verified.

Từ khóa

#Inverters #Photovoltaic systems #Solar power generation #Power supplies #Voltage control #Photovoltaic cells #Integrated circuit interconnections #Frequency #Uninterruptible power systems #Power system reliability

Tài liệu tham khảo

chen, 1992, The parallel operation of two UPS by the couple-inductor method, Proc Conf Rec IEEE ISIE, 733 10.1109/63.406842 10.1109/PEDS.1999.792823 10.1109/APEC.1997.581439 10.1109/28.821807 hua, 1995, Two-level switching pattern deadbeat DSP controlled PWM inverter, IEEE Trans Pow Electron, 10, 310, 10.1109/63.387996 10.1109/PESC.1992.254847