Research On Photovoltaic Inverter Parallel System

Conventional energy sources can not satisfy the needs of human with the energy crisisintensified development in21st century. As the advantage of efficient, non-polluting andsustainable development, Solar energy has been paid more and more attention. Photovoltaicindependent power generation system is still one of the main forms of solar power and has gota wide range of application. However, with electrical equipment on the power supplyreliability and performance requirements of increasingly high, uninterruptible power system(UPS) has been widely applied. UPS modular parallel circuit can achieve large-capacitypower supply and redundant power supply. In this paper, the UPS parallel technology isintroduced into the solar power generation system for achieving the parallel control of the PVinverter.In this paper,the hardware design,the control algorithm and system simulation of the PVinverter parallel system was conducted in-depth study. Design of a three-phase photovoltaicparallel system, the detail of the design essentials about the topological structure of the systemand the control circuit.The system with DSPTMS320F2812as the control core realizes theprotection circuit, data acquisition and parameter calculation and other functions, provides areliable hardware platform for the boost circuit MPPT control algorithm and photovoltaicinverter parallel control algorithm.In terms of software,analysis of the maximum power pointtracking (MPPT) method,the variable step size perturbation and observation method isapplied to the maximum power point tracking.Explore the inverter control design based on thevoltage and current double closed loop control,then conducte in-depth study of SVPWMcontrol technologies.Inquire into the inverter parallel control technology on the basis of a single inverter,build the parallel system model based on the equivalent output impedance and put forwardinverter parallel control scheme based on the active power and reactive power.Finally usingMATLAB/Simulink for experiments and simulations confirmed the feasibility of the systemcontrol program.