Research Of The Schedulability Type Grid-connected Photovoltaic Power Generation System Based On The DSP

With the increasing depletion of traditional fossil energy and theenvironmental pollution is becoming more and more serious, the search fornew alternative clean renewable energy has become more and morenecessary.. Especially when people aware of the seriousness of the harm to thehuman body around PM2.5, as soon as possible to solve the problems in cleanenergy has become the consensus of the whole society. Geothermal energy, windenergy, solar energy, biomass energy and other new energy has receivedworldwide attention as its clean environmental protection and renewable reuse.And the solar industry is developing rapidly in recent years as its wide scope ofapplication. It can be expected that the development of solar energy technologyand industry will mature rapidly and accounted for a large proportionin energy use in the near future.The solar technology is a technology thatconvert solar energy into electrical energy technology. At first, the technologyis only used for independent power generation in remote areas as the limitationsof technology, but due to the overall demand for independent power supplysystem is smaller, if we want solar energy replace the traditional energy sources,the energy must fed into the grid. The electric energy generated byphotovoltaic must meet the requirements for grid. At present the photovoltaicmaximum power tracking technology and the grid connected invertertechnology are main technology. This paper mainly studies the scheduling typephotovoltaic grid connected system.First of all, this paper analysis the current energy situation and make clearthe necessity of the development of photovoltaic industry. Introduce the types ofgrid-connected PV systems and the grid-connected technology standard.Establish a power system model consisting of lying and battery charging anddischarging circuit. Study the mathematical model of the grid connected inverter.The method of grid voltage orientation is based on the grid voltage zero crossingdetection combined with PLL. Proposed an improved islanding detectionmethod and proved it. Finally, SVPWM modulation technology is used in pulsewidth modulation of the inverter, the concrete steps of software method ofSVPWM modulation in the DSP controller is given.In the experimental platform of the system, this paper set up two stagephotovoltaic grid connected inverter system. Design control system based on theTMS320F2812.Completed the signal detection circuit, power module, drivingcircuit, protection circuit and zero-crossing detection circuit.Write DSPprogram according to the control plan, including the main program, interruptsubroutine, sampling procedures and each module of the program, whichprovides hardware and software support for the experiment mode. This paper debugging the system based on the hardware and thesoftware.Complete the experiment include the current control and the islandingdetection. The experimental results show that, the hardware system can runreliably and stably, the proposed design scheme is reasonable and effective,meeting the relevant national standards, has certain feasibility.