Study On LED Illumination System Using Solar Cell Complemented Intelligently By Grid

With environmental pollution and energy crisis are becoming more and moreserious, full development and utilization of renewable energy has become a trend intoday’s society. Solar energy is one of the most focus in the types of renewableenergy.which has inexhaustible advantage and it is not influenced by geographic.Due to its unique advantages of environmental and long life, LED lighting, graduallybecome the mainstream of lighting lamps and lanterns Photovoltaic LED illuminationsystem is great to get rid of the dependence of the traditonal power and artificialmaintenance, etc,which has the advantage of low cost.By analyzing the existing power supply photovoltaic LED illumination, in orderto ensure the reliability and stability of the power supply system, photovoltaic LEDillumination system is required to add backup power. Batteries are generally used asbackup power in the photovoltaic LED illumination system, however battery has ashort life, environmental pollution and other shortcomings. and its costs accounted for20%to25%of the cost of photovoltaic systems. If some environments requirediurnal lighting, such as underground parking, underground supermarkets and so on,grid can be use as back-up energy in a grid environment, without the use of batteries,photovoltaic/grid hybrid Power LED illumination system is bulided base on themultiple-input converte which not only improve the utilization efficiency of solarenergy and simplify the circuit but also reduce costs.Base on searching a large numble of domestic and international data aboutMultiple-Input Converte and the energy management strategy, double-Input buckconverter is choosed to be main circuit in the photovoltaic/grid hybrid power LEDillumination system. Through rational analysis which is base on principle ofdouble-input buck converter and energy management of multiple-input converte,select the rational design and rational design of energy management which useone-cycle control for the adjustment of the output voltage to determine the threemodes circuits: solar supply power alone, grid supply power alone, photovoltaic/grid hybrid power.The simulation model of photovoltaic/grid hybrid power LEDillumination system is build and parameters of the circuit is designed in the Sabersofware. Selecting the appropriate compensation network and output voltageregulator parameters is designed and simulation in the mathcad software. Simulationresults in the Saber sofware are shown to verify the effectiveness of the energymanagement strategy.Finally, to bulid a complete system. software and hardware of the system isdesigned rationally. STC12C series microcontroller is choosed to be control core, andcontrol program is designed. The hardware circuit design including select the switchand diode, the design of drive circuit and sampling circuit. Build a system experimentplatform and experimental verification, the results are shown to verify the feasibilityand effectiveness of plan of digital control circuits. The desired goals is achievedbasically.