Design and Investigation of Grid Connected Current Source Inverter for Photovoltaic System
نویسندگان
چکیده
A high efficiency and operating life of grid feeding solar photovoltaic (PV) inverters are demanded. Because of reduced dclink capacitor requirement, current source inverter (CSI) offers higher reliability than the voltage source based solar inverter. Nonetheless, conventional three-phase pulse width modulated (PWM) current source based solar inverter injects high earth leakage current into the grid. In order to suppress this current, an isolation transformer can be used. Use of this transformer increases the cost and size, and decreases overall efficiency. To address the previously stated impediments, a modified CSI is proposed in this paper. The proposed inverter suppresses the earth leakage current without using an isolation transformer, thereby increasing the efficiency and reducing cost as compared to conventional current source based solar inverters. A mathematical model of the system is derived based on which controller for the operation of the inverter is designed. The viability of the plan is verified through detailed simulation study. KEYWORDS-Pulse Width Modulated (PWM),Insulated Gate Bipolar Transistor (IGBT) PhotoVoltaic, Current Source Inverter, Voltage Source Inverter.
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