CONTROL STAND ALONE THREE–PHASE PHOTOVOLTAIC SYSTEM

Nguyen Viet Ngu; Le Thi Minh Tam; Do Thanh Hieu

Nguyen Viet Ngu Hung Yen University of Technology and Education
Le Thi Minh Tam Hung Yen University of Technology and Education
Do Thanh Hieu Hung Yen University of Technology and Education

Keywords: Photovoltaic (PV) system, Three-phase Z-Source inverter, Particle swarm optimization (PSO), Space vector pulse width modulation (SVPWM)

Abstract

The purpose of PV inverters control is to inversely transform the DC output electric power of PV-array into AC electric power with voltage amplitude, frequency, phase angle are achieved the standard of AC power supplied to the load. A kind of three-phase Z-Source inverter operational principle is analyzed in this paper. Formulas for the design of main parameters under the control of constant duty cycle of shoot-through switching state are established and combined with the PSO control to stick to the maximum power point of the Photovoltaic under shade conditions. Then the simulation models of SVPWM with shoot-through zero vectors are established by using Matlab/Simulink in order to control the switches of Z-Source inverter on and off. Simulation results show that the theoretical analysis and the simulation models are validity.

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