Research And Development Of Intelligent Photovoltaic Power Controller For Solar Street Lamp

With the growing shortage of the world energy and the strengthening awareness of the environment protection, solar energy has been widely accepted as one of the green energy and photovoltaic generation technology is getting more and more attention. This paper presents the procedure of the design of an efficient photovoltaic power controller to meet the need of independent photovoltaic system of low or middle power.Independent solar street lamp has been taken for example in this paper, the basic work principles of solar cells and lead-acid batteries have been introduced, the issues of the most power point tracking(MPPT) of the solar cells and charge strategy optimizing of lead-acid batteries has been researched. A converter based on BOOST circuit to realize two-stage charge strategy combining MPPT and constant voltage has been designed.This paper has established and simulated the MATLAB simulation model of the solar cells according their engineering mathematical model. The perturbation & observeation method and incremental & conductance method are simulated and compared as two of the most common algorisms, The differences of the effects of these two methods have been analyzed.This paper has presented the hardware design procedure of the photovoltaic power controller based on MSP430F235 and accomplished the relevant program and algorism using C language, the expectant control functions during the courses of charge and discharge in the LED street lamp system has been realized, the functions of over-current protection, reverse connection protection and short-circuit protection have been achieved. The expectant result has been verified in actual application.