Modeling And Simulation Based On IGBT Inverter Photovoltaic Grid Research

With growing demand for energy, and together with the declining available amount of original primary energy, there is an urgent need to find new energy sources to promote social stability and progressive development. Solar energy has been the concern of countries around the world for its advantages such as abundance, inexhaustibility, cleanness, reality and most likely to be explored by large scale, and will be bound to become the first choice for the next generation of renewable energy. However, as a most important utilization pattern of solar energy, photovoltaic (PV) grid-connected now is gaining more and more research attention.Based on the framework of solar photovoltaic power generation system, this paper has studied solar photovoltaic cell, the maximum power point tracking technology (MPPT) and inverter technology, an then established their mathematical model. Finally, simulation model experiment has been built in this paper via the use of MATLAB tool.1. Solar photovoltaic cell is a special energy storage device, which is not a constant current source or a constant voltage source, but a non-linear DC source. Its output will change in real time with the light intensity of solar and the load condition and other factors. This paper analyzes the physics and circuit characteristics of solar cell in details, and establishes its mathematical model and simulation model, providing theoretical basis and model reference for the subsequent part of the study.2. The maximum power point tracking technology (MPPT) occupies a significant position in solar photovoltaic power generation system, therefore, whether the solar photovoltaic cell can work at the maximum power point has direct impact on the solar energy conversion efficiency. So, this paper mainly discusses this technology and proposes a new optimized maximum power point tracking method for PV system, representing its workflow, establishing its simulation model and verifying its effectiveness. As seen in this paper, simulation and experimental results show that this new method effectively overcomes shortcomings such as, the oscillation problem of traditional maximum power point tracking, slow tracking and unable to be anti-interference and so on.3. Inverter technology is the core of PV grid-connected system. It aims at converting director current (DC) generated by photovoltaic cell into alternate current (AC) of ordinary grid. With the advantage of DSP, this paper mainly analyzes the usage of event manager to generate SVPWM waveform to control IGBT's open, so as to achieve the implementation of inverter technology. This paper first establishes SVPWM control method's mathematical model, and then builds the simulation model based on internal and external dual-loop control method. Through the simulation to verify its feasibility, this paper provides more reliable theoretical basis and model for future hardware design and prototype's building.